Microcrystalline cellulose (Microcrystalline Cellulose, MCC) is among the most commonly used—and arguably the most “basic yet critical”—cellulosic materials in both pharmaceutical formulation and materials science. It serves not only as a core excipient in oral solid dosage forms (tablets/capsules), but also as a widely used stabilizer, filler, and carrier in food, personal care, and research applications. Understanding MCC through the logic of “source → structure → performance → application” can significantly reduce trial-and-error in formulation design, experimental controls, and product selection.
What Is Microcrystalline Cellulose (MCC)?
According to authoritative definitions, MCC is a purified, partially depolymerized cellulose prepared from α-cellulose in plant fibrous pulp by mineral acid treatment (acid hydrolysis). A typical characteristic is a reduced degree of polymerization (often described as “typically < 400,” based on JECFA specifications). MCC is generally a white or off-white fine powder or granular powder; its flowability depends on particle size, particle morphology, and grade (some grades can exhibit relatively good flow).
- Common CAS No.: 9004-34-6.
- In the food additive system, MCC corresponds to INS / E-number: 460(i); JECFA also lists “cellulose gel” as a synonym.
- Note: In regulations/specifications, “cellulose gel” may be used as a synonym for MCC. However, in industrial formulation contexts, “colloidal MCC / cellulose gel” often specifically refers to an MCC + NaCMC co-processed system used to form a thixotropic suspension structure.
Why Do We “Need” MCC? — What Problems Does It Solve?
- Although natural cellulose (e.g., cotton fiber, wood pulp fiber) is abundant, it typically has long fibers, a dense structure, and significant batch-to-batch variability. When used directly in formulations, it often causes issues such as poor flow, unstable tabletability/compressibility, and poor blend uniformity.
- The value of MCC lies in controlled acid hydrolysis, which weakens/removes the more hydrolysis-prone amorphous regions of cellulose to obtain a more “ordered” microcrystalline structure, and further forms dried porous particles, thereby markedly improving its processability as a powder.
- For pharmaceutical formulations, MCC’s core value is direct-compression dry binding and compressibility. It may also contribute to disintegration (via wicking/capillary action) and powder flow, but the extent varies significantly with particle-size grade, lubrication system, and whether it is co-processed.
Structure and Microstructural Features: Why MCC Works So Well
Structural/Microstructural Feature (What) | Immediate Property (So what) | Resulting Performance / Application Effect (Now what) |
Purified, partially depolymerized cellulose (from α-cellulose via mineral acid treatment); typically lower DP | Shorter chains, better powder processability, more controllable batch consistency | A standardized base excipient for pharmaceutical/food grades (commonly used for direct compression/dilution/stabilization) |
High proportion of “microcrystalline domains” (more ordered than native cellulose) | More stable crystalline structural characteristics; suitable as a model substrate for cellulose studies | Used in research as a reference for cellulose structure/enzymatic hydrolysis/pretreatment; reduces experimental noise from material variability |
Porous particles / engineered particulate morphology | Larger true contact area during compaction; more favorable plastic deformation; stronger interparticle interactions | Strong direct-compression dry binding; easier to achieve higher tablet hardness (MCC is a classic direct-compression excipient) |
Hydroxyl-rich surface (–OH), readily forms hydrogen-bonding networks | One source of interparticle adhesion and strength | Improved tablet strength and cohesion; mechanism often explained using “hydrogen-bond networks” |
Practically insoluble in water and many organic solvents (MCC is insoluble in water, ethanol, ether, and dilute mineral acids; in sodium hydroxide solution it may show slight dissolution/swelling.) | Behaves more as dispersed/suspended particles than as a dissolved thickener | Formulation should be designed as a “powder dispersion system”: suspension stability often requires colloidal systems or co-processing approaches |
Particle size distribution can be defined/controlled (clear differences among grades) | Affects flow, blend uniformity, compressibility, and disintegration tendency | Selection strategy can be “flow-priority” vs. “compaction/adsorption-priority” by choosing particle-size grades |
Can be used for anti-caking/dispersion/stabilization (food additive functional description) | Improves powder behavior and helps stabilize systems | Used in food/personal care for anti-caking, dispersion, and stabilization functions |
Common Key Applications of MCC
Application Module | Typical Application Scenarios | Common Objectives / Value | Parameters / Forms to Prioritize During Selection |
Pharmaceutical solid dosage forms (core) | Diluent/filler; dry binder/direct compression; cores/pellets/spherical carriers; coating/controlled-release systems | Improve compressibility and tablet strength; improve flow and process window; carriers for multiparticulates/coating; controlled release or site-specific release | Particle size/PSD; moisture/LOD; bulk density/flow; co-processed or not (silicified / with CMC-Na); cores/spheres (Spheres) |
Food | Bulking/dietary fiber; stabilization/dispersion; anti-caking; texture and mouthfeel modification | Increase volume and fiber attributes; improve system stability and dispersion uniformity; reduce caking/bridging; optimize texture and processing stability | Regulatory designation (E 460(i)/(ii), FCC, etc.); particle size; hygroscopicity/moisture; dispersibility (whether colloidal system) |
Personal care / cosmetics | Suspension stability/thixotropic structure building (prefer colloidal/co-processed MCC such as MCC+CMC-Na); sensory/skin feel improvement; oil control/adsorptive carrier (single MCC commonly used) | Control viscosity and thixotropy; reduce sedimentation/phase separation; improve sensory feel; adsorption and fragrance/oil carrying | Whether colloidal/co-processed (determines structuring and thixotropy); particle size; porosity/adsorption; whether colloidal/co-processed (more conducive to forming stable structures) |
Research materials | Model substrate (cellulase hydrolysis/pretreatment); adsorption/carrier; composite filler; surface modification studies | Provide a reproducible cellulose model; a modifiable porous carrier; reinforce/fill composites; study interfaces and structure–property relationships | Batch consistency; particle size and specific surface area; moisture; purity/ash; surface chemistry (whether further modification is needed) |
Key Performance Indicators of MCC: What to Check for Selection and QC
Key Indicator | Why It Matters | Typical Direction of Impact (Engineering Meaning) | Selection Notes |
Particle size / particle size distribution (PSD) | Flow, blend uniformity, tableting performance, disintegration, surface adsorption | Finer: ↑ specific surface area, easier compaction but potentially poorer flow; coarser: better flow but may reduce compaction/tabletability | Direct compression requires balancing “flow + compressibility”; carriers/coating cores may favor more regular particles; stronger adsorption/dispersion may favor fine powder |
Moisture / Loss on drying (LOD) | Sticking/picking risk during compression, powder flow, compatibility with moisture-sensitive APIs, storage stability | Higher moisture: may increase sticking/caking; lower moisture: better for moisture-sensitive systems but may affect some compression windows | For moisture-sensitive APIs / water-controlled systems, prioritize low-moisture grades; if process issues occur (sticking, surface defects), check moisture first |
Bulk density / tapped density | Filling consistency, tablet weight variability, blend volume, manufacturability at scale | Higher density: better filling efficiency and smaller volume; lower density: larger volume at the same mass | Capsule filling or volume-limited formulations may prefer higher density; if weight variation is large, optimize density together with flow |
Compressibility / plastic deformation (compaction behavior) | Tablet strength in direct compression, hardness and friability, compaction process window | Stronger plastic deformation: better dry binding and higher tablet strength | For “direct compression / low-pressure compaction,” prioritize grades with stronger compaction performance; when compression force is limited, MCC is often the first-choice direct-compression backbone |
Porosity / specific surface area | Adsorption, wetting/capillary action, carrier capacity, dispersion and disintegration contribution | More porosity: stronger adsorption/wetting but may increase moisture uptake | For fragrance/oily component carriers or when stronger adsorption is needed, focus on porosity; for moisture-sensitive systems, balance against hygroscopicity |
Degree of polymerization / “partial depolymerization” | Defines MCC identity and batch consistency | MCC is described in authoritative specs as “partially depolymerized cellulose,” with DP typically below a certain level | For regulatory/pharmacopoeial compliance or reproducible research, prioritize grades explicitly meeting pharmacopeial/regulatory requirements; JECFA describes “DP typically < 400” |
Solubility / swelling | Determines whether it dissolves or only disperses | Typically “practically insoluble,” existing mainly as dispersed/suspended particles; may show slight swelling under certain alkaline conditions | In aqueous systems, do not treat it as a “soluble thickener”; for stable suspensions, focus on “colloidal/co-processed systems” |
Ash / inorganic impurities / heavy metals | Affects pharma/food compliance and sensitive systems (catalysis/optics/electrochemistry, etc.) | Higher impurities may introduce background interference or stability risks | For high-demand research (analytical, electrical properties) or regulated products, choose grades with clear limits/pharmacopoeial compliance |
pH (dispersion/extract) | Affects API stability, compatibility, and stability of certain colloidal systems | Deviations may affect stability or trigger interactions | For pH-sensitive systems (acid-/base-sensitive APIs or protein systems), consider pH as a release/benchmark parameter |
Co-processed/blended or not (silicified, MCC+CMC-Na, etc.) | Directly determines flow enhancement or suspension stability/thixotropic structuring | Silicified/SiO₂-containing systems often improve flow; MCC+CMC-Na co-processing favors stable dispersion/structure building | Poor flow / difficult direct compression: prefer silicified/flow-enhancing types; aqueous stability/thixotropy: prefer MCC+CMC-Na co-processed/colloidal systems |
Regulatory/pharmacopoeial designation (JP/Ph.Eur/NF/FCC/E 460(i)/(ii), etc.) | Determines compliance boundary, permitted uses, and quality system | Same-name products may differ greatly by grade (PSD/density/moisture/impurity limits/test methods) | Early R&D may screen trends with research grade, but before finalization 반드시 switch to the target regulatory grade and perform equivalence verification |
What Can MCC Do in Research and Experiments?
Beyond being studied as an excipient material itself, MCC also plays several highly practical roles in laboratories:
1. Model substrate for cellulase/cellulose degradation studies
- Many papers and experimental setups use Avicel (MCC) as a high-crystallinity cellulose substrate to study how pretreatment affects enzymatic hydrolysis kinetics.
2. Substrate for enzyme activity assays (especially for evaluating hydrolysis of insoluble cellulose)
- For example, some commercial methods use “Azo-Avicel” (dyed MCC) as a potential assay substrate for endo-cellulase and related enzymes, noting that MCC, due to its higher crystallinity, is typically more resistant to hydrolysis.
3. Carrier/adsorbent material and reference standard
- MCC is porous and hydroxyl-rich, and is often used in adsorption, dispersion, composite filling, and surface-modification studies as a reference material (particularly suitable for teaching and methodological validation).
Process / Pain Point → Recommended MCC Type
Process / Use Scenario | Common Pain Points | Recommended MCC Direction | Notes (How to judge whether you selected correctly) |
Direct compression (DC) | Insufficient powder compressibility, inadequate tablet hardness, narrow process window | Pharmacopoeial/regulatory MCC (for direct compression) → (if flow is poor) silicified/flow-enhancing co-processed MCC | MCC is widely used in direct compression; the core value is “strong dry binding and direct-compression tabletability.” |
Compression after wet granulation | Unstable granule formation; difficult balance between tablet strength and disintegration | MCC as diluent/backbone + (as needed) disintegrant combination | MCC acts as a backbone/base excipient; performance is balanced through disintegrants/lubricants |
Dry granulation/roller compaction | Post-compaction granule strength and compressibility; fines recycle | Focus on MCC grades with more stable “particle size/density/flow,” or flow-aid co-processed systems | Key metrics: density, PSD, and flow; avoid batch variability causing roller-compaction instability |
Coating cores/multiparticulate systems | Need regular spherical carriers, uniform coating, stable drug-layer deposition | Spherical/pellet MCC carriers (spheres/pellets) | Key criteria: sphericity, particle-size range, bulk density, and abrasion resistance |
Suspensions/colloidal systems (food/oral liquids/personal care) | Fast sedimentation, phase separation, insufficient thixotropy | Colloidal MCC or MCC+CMC-Na co-processed systems | Single MCC powder is often a “dispersion,” whereas colloidal/co-processed systems are better at building stable structural networks |
Powder flow aid/anti-caking demand | Poor flow, bridging, unstable feeding/discharge | Silicified / colloidal silica co-processed MCC, or additional flow aids | Goal: improve flow and anti-caking; JECFA also lists anti-caking/dispersion functions |
Research: cellulase hydrolysis/pretreatment | Need a stable “high-crystallinity cellulose model substrate” | MCC (as model substrate) | MCC is often used as a model insoluble cellulose substrate for pretreatment/hydrolysis kinetics comparisons (pay attention to batch consistency) |
Research: composites/surface modification | Difficult dispersion, poor interfacial compatibility | Choose MCC with particle size/surface properties better matched to the system; perform surface modification if necessary | Focus on particle size, specific surface area, moisture, and dispersion strategy; avoid applying “pharma direct-compression logic” directly to materials systems |
Use Notes and Safety Considerations
- Hygroscopicity and storage: MCC is stable but somewhat hygroscopic; store sealed in a cool, dry place.
- Incompatibilities: Incompatible with strong oxidizers; avoid strongly oxidative environments in experiments or formulations.
- Dust control: As a fine powder, implement dust control during weighing/transfer (mask/local exhaust) to avoid inhalation irritation and cross-contamination (especially in pharmaceutical systems). Fine powders can present combustible dust and dust explosion risks under certain conditions (especially during large-scale conveying, sieving, mixing, and dust collection systems). This is a common omission when scaling up from lab to production.
Aladdin Microcrystalline Cellulose (MCC) and Related Excipients/Materials—Selection Summary Table
The table below summarizes products on the Aladdin platform closely related to microcrystalline cellulose (MCC), including: core pharmaceutical/regulatory-grade MCC, co-processed/modified MCC systems (e.g., silicified, MCC+CMC-Na co-processed), cores/spherical carriers, powdered cellulose and particle-size series, as well as commonly co-used disintegrants, diluents, and glidants in oral solid dosage development, and selected coating polymers and materials-grade cellulose derivatives. This enables comparative selection based on process (direct compression/granulation/coating/cores) and target properties (flowability, compressibility, disintegration, controlled release/enteric performance, etc.).
Category | CAS No. | Aladdin Cat. No. | Product Name | Specification or Purity | Function / Application Notes |
Core MCC, pharmaceutical/regulatory grade | 9004-34-6 | Microcrystalline Cellulose | ChP, JP, European Pharmacopoeia (Ph.Eur), E 460(i), FCC, NF | Core diluent and structural backbone commonly used for direct compression/granulation; improves compressibility, tablet strength, and process stability | |
Core MCC, pharmaceutical/regulatory grade | 9004-34-6 | Microcrystalline Cellulose | JP, European Pharmacopoeia (Ph.Eur), E 460(i), FCC, NF | Same as above: pharmacopoeial/regulatory-grade MCC suitable for comparative selection in oral solid dosage forms | |
Core MCC, pharmaceutical/regulatory grade | 9004-34-6 | GMP1491563 | Tableting Aid K (Cellulose Powder) | GMP, PharmPure™, JP, BP, European Pharmacopoeia (Ph.Eur), NF | Dedicated excipient system for direct compression; improves flow/compressibility and widens the compaction process window |
Co-processed/modified MCC system | 9004-34-6 | Silicified Microcrystalline Cellulose | JP, European Pharmacopoeia (Ph.Eur), Colloidal anhydrous, E 460(i) and Silica, E 551, NF | SMCC concept: commonly used to improve powder flow, anti-caking, and compaction performance (more direct-compression friendly) | |
Co-processed/modified MCC system | - | Microcrystalline Cellulose and Sodium Carboxymethyl Cellulose | European Pharmacopoeia (Ph.Eur), E 460(i), E 466, NF | MCC+CMC-Na blend/co-processed: improves dispersion, stability, and processability (for suspension stability/process improvement, etc.) | |
Co-processed/modified MCC system | 9004-34-6 | Cellulose | Colloidal, microcrystalline, containing 10.0–20.0% sodium carboxymethyl cellulose as stabilizer | Colloidal MCC system: for suspension stabilization, thickening, and thixotropic structure building (typical aqueous systems) | |
Co-processed/modified MCC system | - | Co-processed Microcrystalline Cellulose–Sodium Carboxymethyl Cellulose | - | MCC+CMC-Na co-processed: commonly used to improve system stability and processability (confirm positioning via COA/instructions) | |
Co-processed/modified MCC system | - | Co-processed Microcrystalline Cellulose–Colloidal Silica | - | MCC+colloidal silica co-processed: improves flow/anti-caking and compaction stability | |
Cores/spherical carriers | 9004-34-6 | Microcrystalline Cellulose | JP, European Pharmacopoeia (Ph.Eur), NF, Spheres | Spherical carrier (cores/spherical particles): for coating cores, drug layering, and controlled-release carrier systems | |
Cores/spherical carriers | - | Microcrystalline Cellulose Cores | - | Core carriers for coating/layering/pelletization, etc. | |
Cellulose powder / powdered cellulose (MCC-related) | 9004-34-6 | Powdered Cellulose | JP, European Pharmacopoeia (Ph.Eur), E 460(ii), FCC, NF | Filling/dilution and bulking; similar functions to MCC; often used as a control or alternative/combined option | |
Cellulose powder / powdered cellulose (particle-size series) | 9004-34-6 | Cellulose Powder | ≤25 μm | Finer particle size: larger surface area and stronger adsorption; for formulation/process screening and performance comparison | |
Cellulose powder / powdered cellulose (particle-size series) | 9004-34-6 | Cellulose Powder | Particle size: 50 μm | Particle size affects flow, blend uniformity, and tableting; for matching different process windows | |
Cellulose powder / powdered cellulose (particle-size series) | 9004-34-6 | Cellulose Powder | Particle size: 65 μm | Same as above: for balancing powder flow/tableting/carrier performance | |
Cellulose powder / powdered cellulose (particle-size series) | 9004-34-6 | Cellulose Powder | Particle size: 90 μm | Relatively more favorable for flow; often used when more stable feeding/flow is needed | |
Cellulose powder / powdered cellulose (particle-size series) | 9004-34-6 | Cellulose Powder | Particle size: 180 μm | More oriented toward carrier/high-flow needs; also for particulate structure studies | |
Cellulose powder / powdered cellulose (particle-size series) | 9004-34-6 | Cellulose Powder | Particle size: 250 μm | Same as above: coarser particles, often used for carriers/flow-priority selection | |
Cellulose powder / microcrystalline powder (research/material grade) | 9004-34-6 | Cellulose | Microcrystalline, powder, 20 μm | Microcrystalline powder for research/material uses; for blending, adsorption, dispersion, material modification, etc. | |
Cellulose powder / microcrystalline powder (research/material grade) | 9004-34-6 | Cellulose | Microcrystalline powder | Same as above: general-purpose microcrystalline powder for research/material applications | |
Disintegrant (frequently co-used) | 74811-65-7 | Croscarmellose Sodium | JP, European Pharmacopoeia (Ph.Eur), NF | Superdisintegrant: promotes disintegration via swelling and capillary action; commonly combined with MCC | |
Disintegrant (frequently co-used) | 9063-38-1 | Sodium Starch Glycolate (CMS) | AR | Superdisintegrant: accelerates disintegration and drug release (common in formulations) | |
Disintegrant (frequently co-used) | 25249-54-1 | Crospovidone (PVP-P) | USP, JP, European Pharmacopoeia (Ph.Eur), E 1202, NF | Superdisintegrant: primarily wicking/capillary absorption; commonly used in direct compression/granulation formulations | |
Binder/disintegration (common pharma excipient) | 9005-25-8 | P1373823 | Pregelatinized Starch | PharmPure™, pharmaceutical grade | Dual function binder/disintegrant: binder for wet granulation; aids binding and disintegration control in direct compression |
Filler/diluent (often compared/combined with MCC) | 10039-26-6 | L462903 | Lactose Monohydrate | GMP, PharmPure™, ChP, JP, BP, European Pharmacopoeia (Ph.Eur), NF, pharmaceutical grade, special “milkshake” tableting grade | Direct-compression/special grade diluent; often compared with MCC for process and taste/hardness performance |
Filler/diluent (often compared/combined with MCC) | 63-42-3 | Lactose, Anhydrous | AR, ≥98% | Common diluent; often used as a formulation control or in combination with MCC | |
Filler/diluent (often compared/combined with MCC) | 69-65-8 | Mannitol | AR, ≥98% | Taste-friendly/low-hygroscopic diluent; often screened with MCC for ODT/chewable tablets | |
Filler/diluent (often compared/combined with MCC) | 7789-77-7 | Dicalcium Phosphate Dihydrate | AR, ≥99% | Inorganic diluent; good flow and tablet hardness; often compared or combined with MCC | |
Glidant/anti-caking/adsorbent | 7631-86-9 | S433695 | Silicon Dioxide | ≥99% | Glidant, anti-caking, adsorbent; commonly used to optimize powder flow (also aligned with co-processing concepts) |
Cellulose derivative (thickening/binding/stabilizing) | 9004-32-4 | Carboxymethyl Cellulose | 800–1000 mPa·s | Thickening, stabilizing, binding, and suspending; rheology and stability adjustment in formulations | |
Cellulose derivative (thickening/stabilizing) | 9050-04-8 | Calcium Carboxymethyl Cellulose | - | Can be used for disintegration/stabilization/thickening (depending on grade/system); common alternative functional cellulose excipient | |
Cellulose ether (thickening/binding/film-forming) | 9004-65-3 | Hydroxypropyl Methylcellulose (HPMC) | 2% viscosity: 6 mPa·s; methoxy: 28–30%; hydroxypropoxy: 7.0–12% | Common coating/binding/controlled-release matrix material; also for thickening/stabilizing and processability improvement | |
Cellulose ether (thickening/binding/film-forming) | 9004-64-2 | Hydroxypropyl Cellulose (HPC) | 1,000–4,000 mPa·s; 2% aqueous solution at 20℃ | Binder/thickener/film former; for tablet binding, film coating, and rheology control | |
Cellulose ether (thickening/rheology) | 9004-62-0 | Hydroxyethyl Cellulose (HEC) | 100–200 mPa·s, 25℃ | Aqueous thickening and suspension stabilization (commonly for water-based systems) | |
Cellulose ether (thickening/film-forming) | 9004-67-5 | Methyl Cellulose (MC) | 100000 mPa·s | Thickening and film-forming (with thermal gelation); for rheology and film-forming applications | |
Controlled release/coating (hydrophobic film-former) | 9004-57-3 | Ethyl Cellulose (EC) | 180–220 mPa·s | Hydrophobic insoluble film former; sustained/controlled-release coating, sealing coat, taste masking/moisture barrier | |
Enteric coating polymer (key) | 9050-31-1 | H684408 | Hydroxypropyl Methylcellulose Phthalate | 31 wt.% phthalyl | Classic enteric coating material; protects acid-sensitive actives and enables intestinal release |
Enteric/solubilizing polymer (coating/ASD) | 71138-97-1 | Hydroxypropylmethyl Cellulose Acetate Succinate (Mw: 20–100k Da) | - | Enteric coating; also commonly used as an amorphous solid dispersion (ASD) carrier to improve dissolution and stability of poorly soluble drugs | |
Enteric coating polymer (classic) | 9004-38-0 | Cellulose Acetate Phthalate | - | Classic enteric coating material; for enteric formulations and site-specific release control | |
Cellulose ester / film material (materials-related) | 9004-35-7 | Cellulose Acetate | Average Mn by GPC ~30000 | Film-forming polymer; for membranes/coatings/fibers and materials modification research | |
Cellulose ester / film material (materials-related) | 9004-36-8 | Cellulose Acetate Butyrate | 35–39% | Film-forming and coating resin; for coatings/inks/plastics modification and related materials applications | |
Cellulose ester / film material (materials-related) | 9004-39-1 | Cellulose Acetate Propionate | Acetyl content ≤1%; propionyl content 42.5% | Film-forming and coating resin; for coatings, plastics, and films | |
Cellulose ester / film material (materials-related) | 9012-09-3 | Cellulose Triacetate | - | High film-forming cellulose ester; for films/fibers/separation membranes/optical film applications | |
Functional cellulose derivative (materials-related) | 9004-41-5 | Cyanoethyl Cellulose (CEC) | Degree of substitution: 2.6 mol cyanoethyl / 1 mol cellulose | Polarity-enhanced derivative; functional films/coatings, binders, electrolyte-related materials research | |
Chromatographic separation medium (bioseparation) | 9013-34-7 | Diethylaminoethyl Cellulose | 40–160 μm | Weak anion-exchange cellulose; for protein/nucleic acid separation and purification | |
Chromatographic separation medium (bioseparation) | 9000-11-7 | Carboxymethyl Cellulose CM-32 | - | Cation-exchange cellulose (CM type); for protein/peptide separation and purification |
Aladdin: https://www.aladdinsci.com/