Mechanisms and Experimental Applications of Cell Wall Polysaccharide-Degrading Enzymes: Plant Cell Walls, Fungal Cell Walls, and Bacterial Peptidoglycan Systems

Cell wall polysaccharide-degrading enzymes are mainly used to lyse plant cell walls, fungal cell walls, bacterial peptidoglycan, and microbial extracellular polysaccharide matrices. Common enzyme types include cellulase, pectinase, xylanase, chitinase, β-glucanase, lysozyme, and various debranching enzymes.

Keywords: cell wall polysaccharide-degrading enzymes; plant cell wall; microbial cell wall; cellulase; pectinase; xylanase; hemicellulase; β-glucanase; chitinase; lysozyme; peptidoglycan hydrolase

1 Research Positioning of Cell Wall Polysaccharide-Degrading Enzymes

1.1 Plant Cell Wall Polysaccharide Substrates

(1) Cellulose

Cellulose is composed of β-1,4-glucose chains and is the main structural polysaccharide of plant cell walls. Its crystalline regions are structurally stable, and a single endoglucanase usually cannot achieve complete hydrolysis. Synergistic action among endoglucanases, exocellobiohydrolases, and β-glucosidases is required. Cellulose degradation experiments are commonly used for lignocellulose saccharification, plant tissue digestion, cell wall structural analysis, and optimization of protoplast preparation conditions.

(2) Hemicellulose

Hemicellulose includes xylan, arabinoxylan, mannan, glucomannan, and xyloglucan. Its main-chain and side-chain structures vary considerably, so multiple enzymes such as xylanase, β-xylosidase, arabinofuranosidase, acetylxylan esterase, and mannanase are usually required for complete degradation. Hemicellulose degradation not only releases products such as xylose, but also improves the accessibility of cellulases to the cell wall framework.

(3) Pectin

Pectin is rich in galacturonic acid residues and is mainly distributed in the primary cell wall and middle lamella. It participates in intercellular adhesion, tissue firmness, and regulation of cell wall porosity. Pectin degradation often involves polygalacturonase, pectin lyase, pectate lyase, and pectin methylesterase. In plant tissue dissociation, fruit softening, juice clarification, and protoplast preparation, the pectinase system is usually a key variable.

(4) Lignocellulosic Composite Structures

In plant secondary walls, cellulose, hemicellulose, and lignin are highly interwoven. Lignin is not a polysaccharide, but it significantly restricts polysaccharide-degrading enzymes from entering the substrate interior. Lignocellulose degradation research often needs to combine pretreatment, hemicellulose debranching, cellulase formulation, and oxidative auxiliary enzymes to improve the hydrolysis efficiency of polysaccharide chains.

1.2 Microbial Cell Wall Polysaccharide Substrates

(1) Fungal Cell Wall

The fungal cell wall is mainly composed of chitin, β-glucan, mannan, and glycoproteins. Chitinases cleave β-1,4-N-acetylglucosamine chains, β-1,3-glucanases act on the glucan backbone, and mannanases participate in mannan hydrolysis. Fungal cell wall degradation is commonly used for mycelial lysis, yeast protoplast preparation, antifungal mechanism research, and cell wall remodeling analysis.

(2) Bacterial Cell Wall

The core structure of the bacterial cell wall is peptidoglycan. Its glycan chains are composed of alternating N-acetylglucosamine and N-acetylmuramic acid residues and are cross-linked by short peptides to form a network structure. Lysozyme mainly cleaves β-1,4-glycosidic bonds in the peptidoglycan glycan chain, while other peptidoglycan hydrolases may act on amide bonds or peptide bridges. Bacterial lysis experiments should consider differences between Gram-positive and Gram-negative bacteria in outer membrane structure, peptidoglycan thickness, and cross-linking degree.

(3) Extracellular Polysaccharides and Biofilm Matrix

Many bacteria and fungi secrete extracellular polysaccharides to form biofilm matrices, such as glucans, alginates, dextran, cellulose-like polysaccharides, and heteropolysaccharides. Extracellular polysaccharide-degrading enzymes can disrupt biofilm spatial structure and improve antimicrobial penetration. They can also be used for extracellular polysaccharide structural analysis. These experiments should distinguish among cell wall lysis, extracellular matrix degradation, and cell death.

Table 1 Cell Wall Polysaccharide Substrates and Representative Degrading Enzymes

Substrate type	Main structural features	Representative degrading enzymes	Typical experimental applications
Cellulose	β-1,4-glucose chains, partially crystalline	Cellulase, β-glucosidase	Lignocellulose saccharification, plant tissue digestion
Xylan	Hemicellulose main chain, often with arabinose or acetyl side chains	Xylanase, β-xylosidase, debranching enzymes	Hemicellulose degradation, enzymatic sugar profile analysis
Pectin	Galacturonic acid backbone with variable methyl esterification	Pectinase, pectin lyase, pectin methylesterase	Tissue softening, protoplast preparation, pectin structural analysis
Chitin	β-1,4-N-acetylglucosamine chains	Chitinase, N-acetylglucosaminidase	Fungal cell wall lysis, antifungal research
β-Glucan	β-1,3 or β-1,6 glucan structures	β-Glucanase	Fungal cell wall degradation, yeast lysis
Peptidoglycan	Network structure of glycan chains and peptide bridges	Lysozyme, peptidoglycan hydrolases	Bacterial lysis, cell wall structural research
Extracellular polysaccharides	Complex composition, often forming biofilm matrix	Dextranase, alginate lyase, glucanase	Biofilm matrix degradation, extracellular polysaccharide analysis

2 Mechanisms of Polysaccharide-Degrading Enzymes

2.1 Glycoside Hydrolase Mechanisms

(1) Endo-Hydrolysis

Endo-acting enzymes randomly cleave glycosidic bonds within polysaccharide chains, rapidly fragmenting long-chain polysaccharides. This is reflected by decreased substrate viscosity, increased soluble oligosaccharides, and reducing sugar release. Endoglucanases, endoxylanases, and some β-glucanases belong to this category. Endo-enzymes are more sensitive to structurally loose regions but have limited ability to hydrolyze highly crystalline or cross-linked regions.

(2) Exo-Hydrolysis

Exo-acting enzymes gradually release disaccharides or monosaccharides from the non-reducing or reducing ends of polysaccharide chains. Cellobiohydrolases, β-glucosidases, and β-xylosidases commonly participate in exo- or terminal hydrolysis. During cellulose saccharification, insufficient β-glucosidase causes cellobiose accumulation, which inhibits upstream cellulases and reduces overall saccharification efficiency.

(3) Enzyme System Synergy

Natural cell walls usually cannot be fully degraded by a single enzyme. Cellulase systems require synergy among endo-, exo-, and terminal hydrolases. Hemicellulose degradation requires cooperation between main-chain hydrolases and debranching enzymes. Fungal cell wall lysis often requires chitinase, β-glucanase, and mannanase together. Composite enzyme systems are closer to actual degradation processes, but mechanism interpretation requires single-enzyme and combination controls.

2.2 Lyases, Esterases, and Debranching Enzymes

(1) Polysaccharide Lyases

Polysaccharide lyases usually cleave uronic acid-containing polysaccharides through mechanisms such as β-elimination rather than conventional hydrolysis. Pectin lyase, pectate lyase, and alginate lyase are common examples and often generate unsaturated oligosaccharides. These enzymes are suitable for pectin structural analysis, alginate degradation, and extracellular polysaccharide matrix disruption research.

(2) Carbohydrate Esterases

Plant cell wall polysaccharides often contain methyl esterification, acetylation, or feruloylation modifications. Pectin methylesterase, acetylxylan esterase, and feruloyl esterase can remove substituent groups and improve substrate accessibility for main-chain hydrolases. For natural plant cell wall samples, adding only main-chain hydrolases often fails to release structural sugars sufficiently.

(3) Debranching Enzymes

Arabinofuranosidase, galactosidase, rhamnosidase, and similar enzymes remove polysaccharide side chains, exposing the main chain and improving subsequent hydrolysis efficiency. Debranching reactions may not significantly increase total reducing sugar readings, but they change oligosaccharide composition, branching ratio, and the depth of main-chain degradation.

2.3 Oxidative Auxiliary Mechanisms

(1) LPMO Activity

Lytic polysaccharide monooxygenases (LPMOs) can act on crystalline cellulose and chitin through oxidative mechanisms, increasing polysaccharide chain cleavage sites and improving the subsequent efficiency of glycoside hydrolases. LPMO reactions depend on metal centers, electron donors, and redox conditions. Experiments should control reductants, oxygen, and peroxide levels to avoid nonspecific oxidative damage.

(2) Removal of the Lignin Barrier

Laccases and peroxidases mainly act on lignin or phenolic structures and are not polysaccharide hydrolases. However, they can improve polysaccharide accessibility by reducing the lignin barrier. In lignocellulosic systems, “lignin modification” and “polysaccharide chain hydrolysis” should be interpreted separately.

(3) Pretreatment Synergy

Acid, alkali, steam explosion, ionic liquids, and mechanical milling can disrupt compact cell wall structures and increase the probability of enzyme-substrate contact. Stronger pretreatment usually increases enzymatic hydrolysis efficiency, but it may also generate inhibitors or alter native structures. Therefore, conditions should be selected according to whether the purpose is mechanism research or applied saccharification.

Table 2 Modes of Action of Cell Wall Polysaccharide-Degrading Enzymes and Experimental Readouts

Mode of action	Representative enzymes	Main result	Recommended readouts
Endo-hydrolysis	Endoglucanase, endoxylanase, β-glucanase	Polysaccharide chain cleavage, viscosity reduction	Reducing sugars, viscosity, oligosaccharide profile
Exo-hydrolysis	Exocellulase, β-glucosidase, β-xylosidase	Release of disaccharides or monosaccharides	Glucose, xylose, cellobiose
Lyase reaction	Pectin lyase, alginate lyase	Formation of unsaturated oligosaccharides	Absorbance at 235 nm, oligosaccharide structural analysis
De-esterification	Pectin methylesterase, acetylxylan esterase	Removal of methyl or acetyl groups	Methanol release, acetic acid release, degree of esterification
Debranching	Arabinofuranosidase, galactosidase	Side-chain removal and improved main-chain accessibility	Monosaccharide composition, oligosaccharide profile
Oxidative assistance	LPMO	Increased cleavage sites in crystalline polysaccharides	Oxidized oligosaccharides, saccharification efficiency, LC-MS

3 Experimental Application Scenarios

3.1 Plant Cell Wall Research

(1) Cell Wall Component Analysis

Plant cell wall polysaccharide composition can be verified through sequential extraction, monosaccharide composition analysis, and specific enzymatic hydrolysis. Cellulase, xylanase, pectinase, and mannanase can be used to determine the presence and structural accessibility of different polysaccharide components. If the contributions of cellulose, hemicellulose, and pectin need to be distinguished, broad-spectrum crude enzyme preparations should not be used as the only evidence.

(2) Protoplast Preparation

Plant protoplast preparation usually requires a combination of cellulase and pectinase. Cellulase weakens the cell wall framework, while pectinase disrupts the middle lamella and intercellular adhesion. Different plant tissues vary greatly in lignification degree, pectin content, and cell wall thickness. Enzyme concentration, osmotic pressure, pH, digestion time, and tissue cutting method all need optimization.

(3) Lignocellulose Saccharification

Saccharification of straw, wood powder, herbaceous plants, and agricultural by-products usually relies on synergy among cellulases, hemicellulases, and auxiliary enzymes. Evaluation indicators should not be limited to total reducing sugars; glucose, xylose, arabinose, and oligosaccharide composition should also be analyzed to determine hydrolysis depth.

3.2 Microbial Cell Wall and Biofilm Research

(1) Fungal Cell Wall Lysis

Fungal cell wall lysis commonly uses chitinase, β-glucanase, mannanase, or composite lytic enzymes. Yeasts and filamentous fungi differ in cell wall composition, and enzymatic lysis conditions also vary. If the goal is nucleic acid or protein extraction, lysis efficiency, target molecule integrity, and protease contamination risk should all be considered.

(2) Bacterial Cell Wall Degradation

Gram-positive bacteria have a thick peptidoglycan layer, so lysozyme is usually more effective. In Gram-negative bacteria, the outer membrane restricts lysozyme access to the peptidoglycan layer, so EDTA, surfactants, heat treatment, or mechanical disruption is often needed. If the research focuses on antimicrobial mechanisms, peptidoglycan hydrolysis, membrane permeability changes, and cell death must be distinguished.

(3) Biofilm Extracellular Matrix Degradation

Biofilm degradation experiments often focus on whether the extracellular polysaccharide matrix is disrupted. Dextranase, alginate lyase, glucanase, or DNase can act on different matrix components. A decrease in biofilm biomass does not directly prove cell death. Viable cell counts, extracellular polysaccharide content, and microscopic imaging should be interpreted together.

3.3 Industrial and Applied Research

(1) Food Processing

Pectinase, cellulase, and hemicellulase can be used for juice clarification, plant tissue softening, extraction efficiency improvement, and viscosity control. In food systems, attention should be paid to enzyme source, optimal pH, optimal temperature, flavor effects, and residual enzyme activity control.

(2) Biomass Conversion

Lignocellulosic biorefining requires converting complex cell wall polysaccharides into fermentable sugars. Enzyme system design should consider cellulose crystallinity, hemicellulose side chains, lignin barriers, and product inhibition. Simply increasing the dosage of one cellulase usually cannot resolve all limitations of complex substrates.

(3) Antibacterial and Antifungal Research

Lysozyme, chitinase, and β-glucanase can be used for cell wall-targeted antibacterial or antifungal research. These experiments should simultaneously assess cell wall integrity, cell membrane permeability, viability, and morphological changes to avoid directly equating structural damage with bactericidal or fungicidal effects.

Table 3 Applications of Cell Wall Polysaccharide-Degrading Enzymes in Different Experimental Systems

Application direction	Common enzymes	Recommended samples or substrates	Core readouts
Plant protoplast preparation	Cellulase, pectinase, hemicellulase	Leaves, roots, callus tissue	Protoplast yield, viability, integrity
Lignocellulose saccharification	Cellulase, xylanase, β-glucosidase, LPMO	Straw, wood powder, pretreated biomass	Reducing sugars, glucose, xylose, saccharification rate
Pectin structural analysis	Pectinase, pectin lyase, pectin methylesterase	Pectin, plant middle lamella	Galacturonic acid, degree of methyl esterification, oligosaccharide profile
Fungal cell wall lysis	Chitinase, β-glucanase, mannanase	Yeast, filamentous fungal mycelia	Lysis rate, protoplast formation, residual cell wall
Bacterial lysis	Lysozyme, peptidoglycan hydrolases	Gram-positive bacteria, pretreated Gram-negative bacteria	OD reduction, viable count, cell wall integrity
Biofilm matrix degradation	Glucanase, alginate lyase, dextranase	Bacterial or fungal biofilms	Biofilm biomass, EPS content, microscopic imaging

4 Experimental Design and Result Interpretation

4.1 Substrate Selection and Pretreatment

(1) Purified Substrates

Carboxymethyl cellulose, microcrystalline cellulose, xylan, pectin, chitin, β-glucan, and peptidoglycan can be used for single-enzyme activity assays. Purified substrates are useful for assessing basic catalytic ability, but they cannot fully represent native cell wall structures.

(2) Natural Substrates

Plant cell walls, fungal mycelia, bacterial cell walls, and biofilm matrices are closer to actual application scenarios but have complex compositions. In natural substrate experiments, enzymatic hydrolysis results are strongly affected by substrate particle size, pretreatment degree, cross-linking strength, sample water content, and inhibitors.

(3) Pretreatment Conditions

Mechanical grinding, freeze-thawing, heat treatment, alkaline treatment, or chelator treatment can improve substrate accessibility. If the research goal is enzymatic hydrolysis in native structures, excessive pretreatment should be avoided. If the goal is maximal saccharification efficiency, stronger pretreatment can be used, but the conditions must be fully recorded.

4.2 Enzyme Combinations and Control Systems

(1) Single Enzymes and Composite Enzymes

Single-enzyme experiments are suitable for determining substrate specificity and catalytic mechanism, whereas composite enzyme experiments are more suitable for simulating actual degradation processes. Plant and fungal cell walls usually require composite enzyme systems. A single-enzyme reaction often reveals only part of the structural contribution.

(2) Negative Controls

No-enzyme controls, heat-inactivated enzyme controls, and substrate blanks should be included. For reducing sugar detection, it is necessary to confirm whether the substrate itself releases background sugars. For cell lysis experiments, nonspecific lysis caused by mechanical damage, osmotic pressure changes, or surfactants must be excluded.

(3) Positive Controls

Positive controls may use known substrates and standard enzyme systems, such as cellulase acting on carboxymethyl cellulose, chitinase acting on colloidal chitin, and lysozyme acting on sensitive Gram-positive bacteria. Positive controls validate the detection system but should not replace mechanism interpretation for the experimental sample itself.

4.3 Detection Methods and Result Interpretation

(1) Reducing Sugar Detection

DNS, PAHBAH, and Nelson-Somogyi methods can be used for total reducing sugar detection and are suitable for rapid comparison of enzymatic hydrolysis intensity. However, reducing sugar assays cannot distinguish whether the signal comes from glucose, xylose, galacturonic acid, or oligosaccharides, so they should not be used alone for structural analysis.

(2) Monosaccharide and Oligosaccharide Analysis

HPLC, HPAEC-PAD, GC-MS, and LC-MS can be used to analyze monosaccharide composition, oligosaccharide chain length, and specific cleavage products. If the research focuses on enzyme cleavage sites, debranching effects, or cleavage mechanisms, glycan profiling methods should be prioritized.

(3) Morphological and Structural Observation

Light microscopy, scanning electron microscopy, fluorescence staining, and immunolabeling can be used to observe cell wall structural changes. In studies of plant protoplasts, fungal mycelial lysis, and bacterial cell wall disruption, morphological evidence helps distinguish partial degradation, structural loosening, and complete lysis.

Table 4 Common Readouts in Polysaccharide Degradation Experiments and Their Applicability

Detection readout	Applicable question	Advantage	Limitation
Total reducing sugars	Whether overall hydrolysis occurs	Simple operation, suitable for initial screening	Cannot distinguish sugar source or product structure
Monosaccharide composition	Which polysaccharides the hydrolysis products originate from	Distinguishes glucose, xylose, arabinose, etc.	Requires more demanding pretreatment and instruments
Oligosaccharide profile	Cleavage sites and degradation depth	Suitable for mechanism analysis	Data interpretation is more complex
Viscosity change	Whether endo-enzymes act on long-chain polysaccharides	Sensitive to endo-action	Does not represent complete hydrolysis
OD reduction	Degree of microbial lysis	Rapid evaluation of cell lysis	Easily affected by aggregation and sedimentation
Microscopic imaging	Whether cell wall structure is disrupted	Shows morphological changes	Limited quantitative capability
Biofilm staining	EPS or biofilm biomass change	Suitable for screening matrix degradation effects	Cannot directly distinguish killing from matrix removal

5 Enzyme and Detection Products Related to Cell Wall Polysaccharide Degradation Experiments

Table 5 Enzyme Products Related to Cell Wall Polysaccharide Degradation Experiments

Cat. No.	Product Name	Grade/Specification	Product Category	Application Positioning
C1375523	Cellulase	Native,EnzymoPure™,≥ 4500 CNU-R/g	Cellulose-degrading enzyme	Used for plant cell wall cellulose hydrolysis, tissue digestion, and lignocellulose saccharification
C755198	Cellulase from Aspergillus sp.	ActiBioPure™, Bioactive, High Performance, EnzymoPure™, ≥1000 U/g liquid	Cellulose-degrading enzyme	Used for plant cell wall degradation, cellulase hydrolysis, and optimization of protoplast preparation conditions
C755159	Cellulase from Trichoderma sp.	powder,≥5,000 units/g solid	Cellulose-degrading enzyme	Used for Trichoderma-derived cellulase systems, cellulose hydrolysis, and saccharification experiments
C766283	Cellulase from Trichoderma reesei	EnzymoPure™, ≥100,000 U/g powder	High-activity cellulose-degrading enzyme	Used for lignocellulose saccharification, plant cell wall degradation, and high-activity enzyme systems
C755216	Cellulase from Trichoderma reesei	aqueous solution,≥700 units/g	Cellulose-degrading enzyme	Used as a liquid enzyme preparation for cellulose hydrolysis and plant tissue digestion
C298999	Cellulase from Trichoderma reesei	Bioactive,ActiBioPure™,High Performance,EnzymoPure™,≥700 EGU/g	Cellulose-degrading enzyme	Used for endo-cellulose hydrolysis, cell wall loosening, and biomass enzymatic hydrolysis
C755184	Cellulase from Trichoderma reesei ATCC 26921	lyophilized powder,≥1 unit/mg solid	Cellulose-degrading enzyme	Used for cellulase activity evaluation and cell wall cellulose degradation
C128647	Cellulase from Trichoderma reesei ATCC 26921	EnzymoPure™, ≥25 units/mg dry weight	Cellulose-degrading enzyme	Used for plant cell wall cellulose degradation and enzyme preparation comparison
C128646	Cellulase from Trichoderma reesei ATCC 26921	EnzymoPure™, ≥45 units/mg dry weight	Cellulose-degrading enzyme	Used for higher-activity cellulose degradation systems and saccharification experiments
C109262	Cellulase from Aspergillus niger(Carrier for starch)	Bioactive,ActiBioPure™,High Performance,EnzymoPure™,≥10,000U/g enzyme powder	Cellulose-degrading enzyme	Used for Aspergillus niger-derived cellulose degradation and plant cell wall enzymatic hydrolysis
C299008	Cellulase, enzyme blend	Bioactive,ActiBioPure™,High Performance,EnzymoPure™,>1000 BHU/g	Composite cellulase system	Used for composite enzymatic hydrolysis of plant cell walls and applied saccharification experiments
C766286	Cellulase(Carrier for starch)	EnzymoPure™, from Trichoderma viride，≥20,000U/g，powder	Cellulose-degrading enzyme	Used for Trichoderma viride-derived cellulose hydrolysis and biomass degradation
G755171	β-Glucosidase	Bioactive, ActiBioPure™, Native, High Performance, EnzymoPure™, ≥10U/mg powder; 10-60 U/mg protein	Cellulose saccharification auxiliary enzyme	Used for converting cellobiose to glucose and reducing cellulase product inhibition
G755204	β-Glucosidase	Bioactive, ActiBioPure™, Native, High Performance, EnzymoPure™, ≥4 U/mg powder	Cellulose saccharification auxiliary enzyme	Used for terminal hydrolysis in cellulose degradation and improving saccharification efficiency
B757910	Beta-glucanase	EnzymoPure™, ≥100 FBG/g	β-Glucan-degrading enzyme	Used for β-1,3/1,4-glucan hydrolysis and fungal/plant glucan structural research
D755108	β-(1→3)-D-Glucanase	Bioactive,ActiBioPure™,Native,High Performance,EnzymoPure™,from Helix pomatia; ≥0.2 U/mg enzyme powder	Fungal cell wall glucan-degrading enzyme	Used for degradation of yeast and fungal cell wall β-1,3-glucan backbones
G1430813	β-1,3-1,4-Glucanase		β-Glucan-degrading enzyme	Used for mixed-linkage β-glucan hydrolysis and plant cell wall or microbial glucan research
np226943	β-Glucanase from Trichoderma sp.	technical grade, ≥50 U/mg powder	β-Glucan-degrading enzyme	Used for Trichoderma-derived β-glucan degradation and applied enzymatic hydrolysis systems
G755113	β-Glucanase from Aspergillus niger	powder, dark brown, ~1 U/mg	β-Glucan-degrading enzyme	Used for Aspergillus niger-derived β-glucan hydrolysis and cell wall glucan analysis
D755057	Dextranase	Bioactive,ActiBioPure™,High Performance,EnzymoPure™,from Chaetomium gracile; ≥400U/mg enzyme powder	Glucan-degrading enzyme	Used for glucan substrate hydrolysis, fungal cell wall degradation, and extracellular polysaccharide degradation
D755076	Dextranase	EnzymoPure™,Derived from Penicillium genus, lyophilized powder, 10-25 units/mg solid	Glucan-degrading enzyme	Used for Penicillium-derived glucan hydrolysis and polysaccharide structural analysis
D298997	Dextranase from Chaetomium erraticum	EnzymoPure™, ≥100 KDU-A/g	Glucan-degrading enzyme	Used for glucan degradation, biofilm polysaccharide degradation, and fungal cell wall-related experiments
H755178	Hemicellulase	Bioactive,ActiBioPure™,High Performance,EnzymoPure™,from Aspergillus niger; ≥400 HCU/mg enzyme powder	Composite hemicellulose-degrading enzyme	Used for hemicellulose hydrolysis, plant cell wall loosening, and lignocellulose saccharification
H304919	Hemicellulase from gastritis	EnzymoPure™, ≥200 unit/mg solid	Composite hemicellulose-degrading enzyme	Used for hemicellulose degradation and composite polysaccharide hydrolysis of plant cell walls
H304918	Hemicellulase from Aspergillus niger	Bioactive,ActiBioPure™,High Performance,EnzymoPure™,≥50 U/mg enzyme powder	Composite hemicellulose-degrading enzyme	Used for Aspergillus niger-derived hemicellulose hydrolysis and saccharification assistance
X195724	Xylanase	EnzymoPure™, ＞100000 U/g	Xylan main-chain degrading enzyme	Used for xylan hydrolysis, hemicellulose degradation, and xylose release analysis
X755181	Xylanase	Recombinant, powder,≥2500 units/g, recombinant, expressed in <I>Aspergillus oryzae</I>	Recombinant xylanase	Used for recombinant xylanase activity evaluation and hemicellulose degradation experiments
np226945	Xylanase from Pichia pastoris	technical grade, ≥100 U/mg powder	Xylan main-chain degrading enzyme	Used for Pichia pastoris-derived xylanase and industrial hemicellulose hydrolysis
X755112	Xylanase from Trichoderma viride	lyophilized powder, 100-300 units/mg protein	Xylan main-chain degrading enzyme	Used for Trichoderma viride-derived xylan hydrolysis and plant cell wall hemicellulose degradation
X298998	Xylanase recombinant	EnzymoPure™, ≥2500 units/g expressed in Aspergillus oryzae	Recombinant xylanase	Used for recombinant xylanase activity validation and xylan degradation mechanism research
E1448586	Exo-1,4-β-xylosidase		Hemicellulose terminal hydrolase	Used for conversion of xylo-oligosaccharides to xylose and analysis of xylan degradation depth
G303580	Gourmet oligosaccharide	EnzymoPure™, Enzyme activity 50000u/g	Mannan-degrading enzyme	Used for hydrolysis of mannan, glucomannan, and some fungal cell wall mannans
P755105	Pectinase from Aspergillus	≥0.3 U/mg	Pectin-degrading enzyme	Used for pectin hydrolysis, plant middle lamella degradation, and tissue softening
P755168	Pectinase from Rhizopus sp.	powder, 400-800 units/g solid	Pectin-degrading enzyme	Used for Rhizopus-derived pectin degradation and plant cell separation
P755221	Pectinase from Aspergillus aculeatus	EnzymoPure™, aqueous solution,≥3,800 units/mL	Pectin-degrading enzyme	Used in liquid pectinase systems, plant tissue digestion, and middle lamella degradation
P755196	Pectinase from Aspergillus niger	BioReagent, suitable for plant cell culture, EnzymoPure™, 40% glycerol solution,≥5 units/mg protein (Lowry)	Pectinase for plant cell culture	Used for plant protoplast preparation, cell separation, and tissue digestion
P128776	Pectinase from Aspergillus niger	EnzymoPure™, ≥20 units/mg dry weight	Pectin-degrading enzyme	Used for pectin hydrolysis and plant tissue softening experiments
P116864	Pectinase from Aspergillus niger	EnzymoPure™, Native,≥30 000 U/g	High-activity pectin-degrading enzyme	Used for efficient pectin degradation, protoplast preparation, and plant cell wall loosening
P1447134	Pectolyase Y-23, A. japonicus		Pectin-degrading enzyme	Used for pectin hydrolysis and degradation of plant cell wall pectin components
P755148	Pectolyase from Aspergillus japonicus	lyophilized powder,≥0.3 units/mg solid	Pectin-degrading enzyme	Used for middle lamella pectin degradation, tissue dispersion, and pectin structural analysis
P299306	Pectinase	EnzymoPure™, ≥3300 PGNU/g	Pectin main-chain hydrolase	Used for polygalacturonic acid hydrolysis, pectin main-chain degradation, and pectin structural research
C1518378	Chitinase	Bioactive,ActiBioPure™,High Performance,Food Grade,EnzymoPure™,from Aspergillus niger; ≥100 U/g enzyme powder	Fungal cell wall chitin-degrading enzyme	Used for chitin hydrolysis, fungal cell wall lysis, and chitin degradation research
C1518376	Chitinase	Bioactive,ActiBioPure™,Native,High Performance,EnzymoPure™,from Trichoderma harzianum; ≥100 U/ml; ≥400 U/mg protein	Fungal cell wall chitin-degrading enzyme	Used for high-activity chitin degradation, fungal cell wall lysis, and antifungal mechanism research
C1440777	Chitinase, Streptomyces griseus		Chitin-degrading enzyme	Used for Streptomyces-derived chitin hydrolysis and fungal cell wall model degradation
C1420242	Chitinase, Serratia marcescens		Chitin-degrading enzyme	Used for bacterial-derived chitinase activity and chitin degradation mechanism research
C755217	Chitinase from Streptomyces griseus	lyophilized powder (essentially salt free),≥200 units/g solid	Chitin-degrading enzyme	Used for chitin hydrolysis and fungal cell wall degradation under low-salt conditions
N755111	β-N-Acetylglucosaminidase from Canavalia ensiformis (Jack bean)	EnzymoPure™,ActiBioPure™,Bioactive,High Performance,Native,ammonium sulfate suspension, ≥10 U/mg protein; Protein content: 1-5 mg/ml	Chitin terminal hydrolysis auxiliary enzyme	Used for terminal product release in chitin degradation and hydrolysis of N-acetylglucosaminide bonds
N755070	N-Acetyl-β-D-Glucosaminidase Control (NAG Control)	from beef kidney	NAG reference standard	Used for quality control of NAG activity assay systems and validation of terminal hydrolysis in chitin degradation
T1509550	T4 Lysozyme	Bioactive,Recombinant,ActiBioPure™,High Performance,EnzymoPure™,≥95%(SDS-PAGE),1 mg/ml	Peptidoglycan hydrolase	Used for bacterial peptidoglycan lysis, cell wall structural research, and recombinant lysozyme controls
L304945	Lysozyme Chloride	From protein	Lysozyme preparation	Used for bacterial cell wall lysis and peptidoglycan degradation experiments
np001031	Lysozyme from Human Neutrophil	Bioactive,ActiBioPure™,Native,High Performance,EnzymoPure™,≥95%(SDS-PAGE),>30,000 sugar U/mg protein; Pre-lyophilization Protein Concentration: See COA	Human-derived lysozyme	Used for human antimicrobial enzyme research, peptidoglycan hydrolysis, and bacterial cell wall lysis
L105521	Lysozyme,from egg white	Bioactive,ActiBioPure™,Native,High Performance,EnzymoPure™,≥20000U/mg enzyme powder	Classical lysozyme	Used for Gram-positive bacterial lysis, peptidoglycan hydrolysis, and nucleic acid/protein extraction pretreatment
L128640	Lysozyme from chicken egg white	EnzymoPure™,Native,≥5,000 units/mg dry weight	Classical lysozyme	Used for routine bacterial cell wall lysis and peptidoglycan degradation experiments
L128641	Lysozyme from chicken egg white(Purified,Salt Free)	EnzymoPure™,Native,≥8,000 units/mg dry weight	Purified lysozyme	Used for bacterial lysis and cell wall degradation systems sensitive to salt background
L1520263	Lysozyme Solution (10 mg/mL)	BioReagent,Suitable for molecular biology,10 mg/mL	Lysozyme solution	Used for molecular biology sample pretreatment, bacterial lysis, and nucleic acid extraction
L1520264	Lysozyme Solution (50 mg/mL)	BioReagent,Suitable for molecular biology,50 mg/mL	High-concentration lysozyme solution	Used for high-concentration bacterial lysis systems and sample pretreatment
L274271	Lysozyme, Egg White	Ultra pure, EnzymoPure™	High-purity lysozyme	Used for high-purity peptidoglycan hydrolysis, methodological controls, and bacterial lysis
L1520911	Laccase	Bioactive,ActiBioPure™,High Performance,EnzymoPure™,≥1 U/mg Liquid; from Aspergillus sp.	Lignin barrier-modifying enzyme	Used for lignin-related structural modification and improving plant cell wall polysaccharide accessibility
L1506448	Laccase	EnzymoPure™,≥1 U/mg; from Aspergillus sp.	Lignin barrier-modifying enzyme	Used for lignin oxidative modification and lignocellulose pretreatment mechanism research
L753822	Laccase	Native,EnzymoPure™,≥1000 LAMU/g; from Aspergillus sp.	Lignin barrier-modifying enzyme	Used for high-activity laccase treatment, lignin barrier weakening, and biomass enzymatic hydrolysis assistance
L304691	Laccase from Trametes versicolor	Bioactive,ActiBioPure™,Native,High Performance,EnzymoPure™,from Trametes versicolor; ≥0.5 U/mg enzyme powder	Lignin barrier-modifying enzyme	Used for Trametes versicolor-derived laccase oxidation modification and lignocellulose degradation assistance
P1437472	Peroxidase, Lignin		Lignin oxidase	Used for lignin barrier treatment, lignocellulose pretreatment, and improvement of polysaccharide accessibility

Table 6 Products for Cell Wall Polysaccharide-Degrading Enzyme Activity and Product Detection

Cat. No.	Product Name	Grade/Specification	Product Category	Application Positioning
C1507302	Cellulase (CL) Activity Assay Kit (DNS, Micro Method)	BioReagent	Cellulase activity detection	Used for measuring cellulase activity in micro systems and screening enzyme preparation conditions
C1507307	Cellulase (CL) Activity Assay Kit (DNS, Colorimetric Method)	BioReagent	Cellulase activity detection	Used for colorimetric measurement of cellulase activity and evaluation of saccharification capacity
E1521911	Endo-β-1,4-Glucanase Activity Assay Kit (Micro Method)	BioReagent	Endocellulase activity detection	Used for measuring endo-β-1,4-glucanase activity and evaluating internal cleavage of cellulose chains
E1521912	Endo-β-1,4-Glucanase Activity Assay Kit (Colorimetric Method)	BioReagent	Endocellulase activity detection	Used for analyzing endo-β-1,4-glucanase activity in colorimetric systems
E1521915	Exo-β-1,4-Glucanase Activity Assay Kit (Micro Method)	BioReagent	Exocellulase activity detection	Used for evaluating exo-β-1,4-glucanase activity and cellobiose release
E1521916	Exo-β-1,4-Glucanase Activity Assay Kit (Colorimetric Method)	BioReagent	Exocellulase activity detection	Used for colorimetric detection of exocellulase activity and analysis of cellulose degradation depth
S1521913	Soil Endo-β-1,4-Glucanase Activity Assay Kit (Micro Method)	BioReagent	Soil cellulose-degrading enzyme detection	Used for measuring cellulose degradation potential and carbon cycling-related enzyme activity in soil samples
S1521914	Soil Endo-β-1,4-Glucanase Activity Assay Kit (Colorimetric Method)	BioReagent	Soil cellulose-degrading enzyme detection	Used for colorimetric measurement of soil endocellulase activity
S1521917	Soil Exo-β-1,4-Glucanase Activity Assay Kit (Micro Method)	BioReagent	Soil cellulose-degrading enzyme detection	Used for evaluating soil exocellulase activity and cellulose degradation processes
S1521918	Soil Exo-β-1,4-Glucanase Activity Assay Kit (Colorimetric Method)	BioReagent	Soil cellulose-degrading enzyme detection	Used for colorimetric detection of exocellulase activity in soil samples
G1521821	β-Glucosidase (β-GC) Activity Assay Kit (Micro Method)	BioReagent	β-Glucosidase activity detection	Used for measuring cellobiose terminal hydrolysis capacity and cellulase saccharification auxiliary enzyme activity
G1521822	β-Glucosidase (β-GC) Activity Assay Kit (Colorimetric Method)	BioReagent	β-Glucosidase activity detection	Used for colorimetric detection of β-glucosidase activity and evaluation of saccharification systems
S1521827	Soil β-Glucosidase (S-β-GC) Activity Assay Kit (Micro Method)	BioReagent	Soil β-glucosidase detection	Used for evaluating soil cellulose degradation terminal hydrolase activity and carbon cycling
S1521828	Soil β-Glucosidase (S-β-GC) Activity Assay Kit (Colorimetric Method)	BioReagent	Soil β-glucosidase detection	Used for colorimetric measurement of soil β-glucosidase activity
G1521909	β-1,3-Glucanase (β-1,3-GA) Activity Assay Kit (Micro Method)	BioReagent	β-1,3-glucanase activity detection	Used for evaluating fungal cell wall β-1,3-glucan degradation capacity
G1521910	β-1,3-Glucanase (β-1,3-GA) Activity Assay Kit (Colorimetric Method)	BioReagent	β-1,3-glucanase activity detection	Used for colorimetric detection of β-1,3-glucanase activity and fungal cell wall enzymatic hydrolysis analysis
X1522006	Xylanase Activity Assay Kit (DNS, Micro Method)	BioReagent	Xylanase activity detection	Used for micro-method measurement of xylanase activity and hemicellulose hydrolysis capacity
X1522007	Xylanase Activity Assay Kit (DNS, Colorimetric Method)	BioReagent	Xylanase activity detection	Used for colorimetric evaluation of xylan hydrolysis and lignocellulose saccharification assistance
X1521980	β-Xylosidase Activity Assay Kit (Micro Method)	BioReagent	β-Xylosidase activity detection	Used for analyzing xylo-oligosaccharide terminal hydrolysis and xylose release capacity
X1521981	β-Xylosidase Activity Assay Kit (Colorimetric Method)	BioReagent	β-Xylosidase activity detection	Used for colorimetric measurement of β-xylosidase activity and evaluation of hemicellulose degradation depth
S1521982	Soil β-Xylosidase Activity Assay Kit (Micro Method)	BioReagent	Soil hemicellulose-degrading enzyme detection	Used for analyzing β-xylosidase activity related to soil xylan degradation
S1521983	Soil β-Xylosidase Activity Assay Kit (Colorimetric Method)	BioReagent	Soil hemicellulose-degrading enzyme detection	Used for colorimetric measurement of soil β-xylosidase activity
P1521893	Pectinase Activity Assay Kit (DNS, Micro Method)	BioReagent	Pectinase activity detection	Used for measuring pectin degradation capacity and plant tissue digestion enzyme activity in micro systems
P1521894	Pectinase Activity Assay Kit (DNS, Colorimetric Method)	BioReagent	Pectinase activity detection	Used for colorimetric measurement of pectinase activity and evaluation of pectin hydrolysis efficiency
P1521921	Polygalacturonase (PG) Activity Assay Kit (Micro Method)	BioReagent	Pectin main-chain hydrolase detection	Used for PG activity measurement, pectin main-chain hydrolysis, and cell wall pectin degradation analysis
P1521922	Polygalacturonase (PG) Activity Assay Kit (Colorimetric Method)	BioReagent	Pectin main-chain hydrolase detection	Used for colorimetric detection of PG activity and evaluation of polygalacturonic acid polymer degradation
P1521891	Pectin Lyase (PL) Activity Assay Kit (UV Micro Method)	BioReagent	Pectin lyase activity detection	Used for PL activity measurement and evaluation of unsaturated pectin oligosaccharide generation
P1521892	Pectin Lyase (PL) Activity Assay Kit (UV Colorimetric Method)	BioReagent	Pectin lyase activity detection	Used for UV colorimetric detection of pectin cleavage reactions
C1522095	Chitinase Activity Assay Kit (Micro Method)	BioReagent	Chitinase activity detection	Used for micro-scale measurement of chitin degradation capacity and fungal cell wall lytic enzyme activity
C1522096	Chitinase Activity Assay Kit (Colorimetric Method)	BioReagent	Chitinase activity detection	Used for colorimetric detection of chitinase activity and evaluation of antifungal enzyme activity
S1522097	Soil Chitinase Activity Assay Kit (Micro Method)	BioReagent	Soil chitin-degrading enzyme detection	Used for evaluating soil chitin degradation, fungal residue decomposition, and nitrogen cycling-related enzyme activity
S1522098	Soil Chitinase Activity Assay Kit (Colorimetric Method)	BioReagent	Soil chitin-degrading enzyme detection	Used for colorimetric measurement of soil chitinase activity
N1521823	N-Acetyl-β-D-glucosaminidase (NAG) Activity Assay Kit (Micro Method)	BioReagent	Chitin terminal hydrolase detection	Used for NAG activity measurement, chitin terminal hydrolysis, and analysis of fungal cell wall degradation products
N1521824	N-Acetyl-β-D-glucosaminidase (NAG) Activity Assay Kit (Colorimetric Method)	BioReagent	Chitin terminal hydrolase detection	Used for colorimetric detection of NAG activity and evaluation of chitin degradation depth
S1521829	Soil N-Acetyl-β-D-glucosaminidase (S-NAG) Activity Assay Kit (Micro Method)	BioReagent	Soil chitin-degrading enzyme detection	Used for soil NAG activity, chitin degradation, and microbial residue decomposition research
S1521830	Soil N-Acetyl-β-D-glucosaminidase (S-NAG) Activity Assay Kit (Colorimetric Method)	BioReagent	Soil chitin-degrading enzyme detection	Used for colorimetric measurement of soil NAG activity
L1522210	Lysozyme (LYS/LZM) Activity Assay Kit (Micro Method)	BioReagent	Lysozyme activity detection	Used for measuring peptidoglycan hydrolysis capacity, bacterial lysis systems, and lysozyme activity
L1522211	Lysozyme (LYS/LZM) Activity Assay Kit (Colorimetric Method)	BioReagent	Lysozyme activity detection	Used for colorimetric detection of lysozyme activity and evaluation of bacterial cell wall lysis capacity
L1522060	Laccase Activity Assay Kit (Micro Method)	BioReagent	Laccase activity detection	Used for measuring laccase activity related to lignin barrier modification
L1522061	Laccase Activity Assay Kit (Colorimetric Method)	BioReagent	Laccase activity detection	Used for colorimetric detection of laccase activity and evaluation of lignocellulose pretreatment
S1522058	Soil Laccase Activity Assay Kit (Micro Method)	BioReagent	Soil lignin oxidase detection	Used for evaluating soil lignin modification, plant residue degradation, and microbial oxidase activity
S1522059	Soil Laccase Activity Assay Kit (Colorimetric Method)	BioReagent	Soil lignin oxidase detection	Used for colorimetric measurement of soil laccase activity
L1515924	Lignin Peroxidase (Lip) Activity Assay Kit (Veratryl Alcohol, Micro Method)	BioReagent	Lignin peroxidase detection	Used for lignin peroxidase activity measurement and lignin barrier pretreatment research
L1515925	Lignin Peroxidase (Lip) Activity Assay Kit (Veratryl Alcohol, Colorimetric Method)	BioReagent	Lignin peroxidase detection	Used for colorimetric evaluation of lignin peroxidase activity
S1515797	Soil Lignin peroxidase (S-Lip) Activity Assay Kit (Resveratrol‌, Micro Method)	BioReagent	Soil lignin peroxidase detection	Used for evaluating soil plant residue degradation, lignin oxidation, and microbial decomposition activity
S1515926	Soil Lignin Peroxidase (S-Lip) Activity Assay Kit (Veratryl Alcohol, Colorimetric Method)	BioReagent	Soil LiP activity detection	Used for colorimetric detection of soil LiP activity and lignin-related degradation evaluation

6 Common Questions

6.1 Why are cellulase and pectinase usually used together in plant protoplast preparation?

Cellulose forms the structural framework of the plant cell wall, while pectin mainly maintains the middle lamella and intercellular adhesion. Cellulase alone may not sufficiently separate cells, while pectinase alone is insufficient to disrupt the cell wall framework. Their combination improves cell wall digestion efficiency and protoplast release.

6.2 Should chitinase or β-glucanase be prioritized for fungal cell wall lysis?

The choice should depend on fungal species and cell wall composition. If chitin content is high, chitinase may be prioritized. For yeasts or certain fungal cell walls rich in β-glucan, β-glucanase is often required. In actual lysis, composite enzyme systems are usually used, and conditions should be validated by microscopic observation and lysis rate.

6.3 Why is lysozyme less effective for lysing Gram-negative bacteria?

The outer membrane of Gram-negative bacteria blocks lysozyme from reaching the peptidoglycan layer, so lysozyme alone often cannot achieve complete lysis. EDTA, mild surfactants, heat treatment, or mechanical disruption can increase outer membrane permeability, but treatment intensity should be controlled according to downstream nucleic acid, protein, or activity assays.

6.4 Does reduced biofilm after polysaccharidase treatment indicate cell death?

Not necessarily. Polysaccharidases may only disrupt the extracellular polysaccharide matrix and loosen the biofilm structure, while cells remain viable. Viable cell counts, metabolic activity, membrane integrity, and microscopic structure should be assessed together to distinguish matrix degradation from killing.

6.5 Why is a heat-inactivated enzyme control needed in polysaccharide-degrading enzyme experiments?

A heat-inactivated enzyme control helps exclude the effects of non-enzymatic components, buffers, salts, or impurities in enzyme preparations on substrates and cell status. If the heat-inactivated enzyme control still produces a significant signal, the result may involve non-enzymatic degradation, chemical interference, or detection background.

Research on plant and microbial cell wall polysaccharide-degrading enzymes should establish correspondence among substrate structure, enzyme mode of action, and experimental readouts. Structural differences among cellulose, hemicellulose, pectin, chitin, β-glucan, and peptidoglycan determine enzyme selection. Reducing sugars, oligosaccharide profiles, cell lysis rates, and microscopic structures reflect different levels of degradation outcomes.

For more related articles, please see below:

[1] Recent Advances in Methods for Measuring Plant Fiber-Related Indices and Application-Oriented Selection