Peptone Water Medium - BioReagent

Cat. No.: P1523295

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Übersicht

Indigo Matrix Testing for Bacteria.

Specifications

Spezifikationen & Reinheit

BioReagent

Storage

Room temperature

Verschickt in

Normal

Note

BioReagent

Product Line

Biologische Produkte

Application Protocols

Item-specific tested applications: Not specified for this item; refer to CoA/Spec Sheet.

General preparation and use (literature protocol—adjust to your method)

1. Weighing and dissolution

• Calculate the required mass per liter according to your validated method (mass-per-liter not specified for this item). Add to purified water while stirring. Warm gently (≤60 °C) to accelerate dissolution; avoid boiling.

2. pH set and sterilization

• Measure pH at 25 °C and adjust to method target if necessary using sterile 1 N HCl/NaOH. Dispense into suitable vessels with vented closures. Autoclave at 121 °C for ~15 minutes (liquids cycle). Alternatively, sterile-filter heat-labile supplements separately and add aseptically after cooling.

3. Quality checks

• Post-sterilization, verify clarity and pH. Include a sterility control (uninoculated tube) and, if required, perform growth-promotion testing with reference strains.

4. Use cases

• Pre-enrichment: Inoculate test material into sterile medium at prescribed ratios. Incubate under organism-appropriate conditions (temperature, atmosphere, agitation) for the method-defined time.
• Indole test: Inoculate and incubate; add Kovács or Ehrlich’s reagent per the biochemical test protocol and interpret color formation.

5. Storage of prepared medium

• If not used immediately, store sterile medium at 2–8 °C for a limited period as justified by internal validation; warm to room temperature before use and recheck clarity/pH.

Documentation

• Record lot numbers, preparation date, sterilization parameters, and QC results in your media log.

Biological Roles

Applicability note

• Peptone Water Medium is not a single biomolecule with a defined physiological role; it is a nutrient matrix for cultivating microorganisms in research and quality control settings.

General/literature perspective

• Nutrient supply: Provides peptides, amino acids, and minerals that support heterotrophic bacterial metabolism, including biosynthesis of proteins and nucleotides and energy generation via central carbon pathways.
• Indole test substrate: The presence of tryptophan residues in many peptones enables detection of tryptophanase activity, linking to bacterial tryptophan catabolism and indole production (e.g., the tryptophan–indole–pyruvate pathway).
• Osmotic balance: Sodium chloride contributes to osmotic stability, aiding cell integrity during early resuscitation of stressed cells.
• Minimal complexity: Compared with richer broths, peptone water exerts less selective pressure and lower buffering, allowing observation of organism-driven pH changes and metabolic byproducts.

Limitations and considerations

• Undefined composition: Batch-to-batch variability in peptide profiles can influence growth of fastidious organisms; supplements may be required for specific taxa.
• Not a buffering system: Limited capacity to resist acidification/alkalinization during growth; buffered variants are preferred for resuscitation of injured cells under adverse pH conditions.

Item-specific details

• Source of peptone(s), exact amino acid profile, and growth promotion specifications are not specified for this item; refer to CoA/Spec Sheet for lot details.

Buffer Applications

Not typically applicable

• Peptone Water Medium is not intended as a buffering system; it exhibits low buffer capacity and is designed for nonselective enrichment rather than pH control.

General/literature guidance if buffering is required

• For workflows requiring pH stabilization during resuscitation/enrichment, consider Buffered Peptone Water (BPW), which typically incorporates phosphate buffers to maintain pH near neutral.
• If a defined pH is critical in your test method with peptone water, adjust pH with sterile acid/base after dissolution and before sterilization, and verify with a calibrated pH meter.

Item-specific buffer specs

• Buffer components, pH targets, and tolerance ranges are not specified for this item; consult the CoA/Spec Sheet or your governing method.

Green Alternatives

Context

• Culture media inherently avoid many petrochemical solvents and harsh reagents. Sustainability considerations focus on raw material sourcing, sterilization energy, packaging, and waste management.

Alternative formulations and practices (general/literature)

• Plant-derived peptones: Consider soy, wheat, or pea peptones to reduce animal-derived inputs. Trade-off: Growth profiles can shift versus casein/meat peptones; revalidate performance with target organisms.
• Buffered Peptone Water (BPW): Although not greener per se, buffering can reduce failed batches and retests, cutting energy and waste from repeat sterilizations.
• On-demand preparation: Prepare only the volumes required to minimize discard of expired sterile medium.
• Energy-efficient sterilization: Use validated fractional or lower-volume autoclave cycles where acceptable; load autoclaves efficiently to reduce energy per liter sterilized.
• Packaging choices: Select larger pack sizes to reduce packaging waste if throughput justifies it; ensure prompt resealing/desiccation to prevent spoilage.

Comparison (literature, qualitative)

• Animal peptone vs plant peptone: Plant sources improve ethical/sustainability profile but may require optimization of supplementation. Performance equivalence is organism-dependent.
• Peptone water vs complex rich broths (e.g., tryptic soy broth): Peptone water has fewer ingredients and can reduce upstream resource inputs; however, additional enrichment steps may be needed for fastidious organisms.

Note

• Specific environmental metrics (carbon footprint, LCA) are not specified for this item; institutions should assess impacts within their sterilization and waste frameworks.

Pharmaceutical Uses

Scope and limitations

• No therapeutic or clinical claims are made. The product is for research and laboratory use only.

General/literature use in pharmaceutical/biotech quality control

• Microbiological QC: Peptone-based waters are employed as nonselective diluents and pre-enrichment broths in environmental monitoring, bioburden testing, and growth-promotion testing workflows, where simple nutrient matrices are desired.
• Media preparation and validation: Used in performance qualification of sterilization processes and aseptic technique exercises due to its straightforward composition and clarity after sterilization.
• Indole testing: Serves as a base medium in identification workflows for certain microbial traits (tryptophanase activity) in non-clinical laboratories.

Regulatory/compendial context

• Specific pharmacopeial recognition, required organisms for growth-promotion, and acceptance ranges vary by method and are not specified for this item; refer to the applicable pharmacopeia or internal SOP, and to the product’s CoA/Spec Sheet.

Practical notes

• For GMP environments, maintain traceability (lot numbers, CoA/SDS), perform incoming inspection (pH, clarity, sterility), and document sterilization parameters and hold times for reconstituted media.
• Evaluate equivalency when changing lots or suppliers by side-by-side growth-promotion testing with relevant strains.

Physical Properties

Item-specific facts (from Product Data)

• Appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight (MW): Not specified for this item; refer to CoA/Spec Sheet (mixture).

General/literature values and characteristics (for peptone water dehydrated medium)

• Physical state (literature): Free-flowing, hygroscopic powder blend intended for aqueous reconstitution.
• Solubility (literature): Freely soluble in water; forms a clear to slightly opalescent solution after dissolution and sterilization depending on source/grade of peptone.
• pH (literature, after reconstitution as directed): Typically near neutral (about pH 7.0 ± 0.2 at 25 °C), but exact pH depends on formulation and lot; verify with pH meter and adjust if permitted by your method.
• Buffer capacity: Low; peptone water is not strongly buffered and will permit metabolic acid/base shifts during microbial growth.
• Density, refractive index, logP, boiling point, melting point: Not applicable or not defined for the dehydrated blend; for the reconstituted solution these are essentially those of water with slight increases in refractive index and density depending on solids content (literature). Specific values are not specified for this item; refer to CoA/Spec Sheet.

Practical notes

• Hygroscopic nature can lead to clumping on exposure to ambient humidity; dispense rapidly and recap tightly.
• For consistent performance, dissolve in freshly prepared purified/deionized water and sterilize by autoclaving according to your validated method.

Quality and Grades

Item-specific facts (from Product Data)

• Grade: BioReagent.
• Appearance: Not specified for this item; refer to CoA/Spec Sheet.

What BioReagent generally implies (general information)

• BioReagent grade typically denotes material suitable for biological and biochemical research, emphasizing lot-to-lot consistency, low bioburden in the dehydrated state, and performance in standard microbiological applications.
• For dehydrated culture media, critical quality attributes often include: performance verification with target microorganisms (growth response), pH after reconstitution, clarity, moisture content, and sterility post-autoclave (all per method). Specific acceptance ranges are formulation- and vendor-specific.

How to use grade information practically

• If your application is regulated or follows a compendial method (e.g., ISO, BAM, pharmacopeial microbiological tests), verify that the lot meets your method’s performance criteria. Request and review the CoA/Spec Sheet for: pH range after reconstitution, growth promotion testing (GPT) organisms and results, and any declared composition tolerances.
• Stabilizers or additives: Not specified for this item; refer to CoA/Spec Sheet. Many peptone waters are simple two-component formulations (peptone + NaCl), with no dyes or buffers, but composition may vary by manufacturer.

Documentation

• Maintain lot traceability and retain CoA/SDS with your records. Perform incoming QC (appearance, pH, sterility check) as required by your QA system.

Reaction and Applications

Scope of use (general microbiology; non-clinical, research/QC contexts)

• Nonselective pre-enrichment: Supports recovery of a broad spectrum of heterotrophic bacteria from environmental, food, and industrial samples prior to selective plating or testing (literature).
• Indole production testing: Serves as a base medium for detecting tryptophanase activity via addition of Kovács or Ehrlich’s reagent after incubation (literature). Many peptones contain tryptophan residues adequate for this assay.
• Water testing workflows: Utilized as a diluent or enrichment step in microbial enumeration or presence/absence workflows (literature), where low buffering allows metabolic shifts to be observed.

Practical tips

• Reconstitution: Dissolve the dehydrated powder completely in purified water with gentle heating and stirring; avoid foaming. Adjust pH if specified by your method, then sterilize (commonly 121 °C, ~15 min; literature—verify locally).
• Oxygenation: For aerobic organisms, provide adequate aeration/shaking during incubation. For anaerobes or microaerophiles, use appropriate atmospheric controls and reducing agents if required by your protocol.
• Supplements: If a specific organism requires growth factors (e.g., vitamins), add sterile-filtered supplements post-sterilization where method-permitted.
• Quality control: Include uninoculated sterility controls and positive-control strains for growth-promotion verification.

Limitations

• Low buffering capacity can permit rapid pH drift, potentially inhibiting sensitive organisms; use buffered peptone water where indicated.
• As a complex medium, composition varies by peptone source; verify performance for critical applications and maintain lot continuity when possible.

Reaction Conditions

Not a classical chemical reaction system

• Peptone Water Medium is used for biological cultivation rather than chemical transformations. Reaction condition guidance below refers to typical microbiological incubation parameters (literature), which must be tailored to the organism and method.

General incubation parameters (literature examples)

• Reconstitution: Dissolve the specified mass per liter of purified water (mass-per-liter not specified for this item; refer to CoA/Spec Sheet or your method). Heat gently to aid dissolution; avoid overheating.
• Sterilization: Autoclave at 121 °C for ~15 minutes (liquids cycle); allow to cool to 45–50 °C if adding heat-labile supplements aseptically.
• Incubation: 20–45 °C depending on organism; aerobic shaking at 120–250 rpm for aerobes; static or controlled atmosphere for anaerobes/microaerophiles.
• Duration: 6–48 hours typical for enrichment; verify per method.
• Expected outcomes: Turbidity increase, pH drift, and odor indicative of metabolic activity (qualitative). Perform plate counts or biochemical tests to quantify/identify growth.

Constraints and tips

• pH: Start near neutral (method-dependent). Low buffering allows organism-driven pH changes; monitor and adjust in buffered variants if necessary.
• Oxygen: Match oxygen transfer to organism needs; use baffled flasks or vented caps for aerobic growth.
• Containment: Use appropriate biosafety containment; include uninoculated controls to detect contamination.

Item-specific parameters

• Exact formulation, mass per liter, and target pH are not specified for this item; consult the CoA/Spec Sheet or your governing method.

Safety and Handling

Item-specific facts (from Product Data)

• GHS Classification, Signal Word, H-statements, Pictograms: Not specified for this item; refer to the SDS.
• Storage: Room temperature; protect the dehydrated powder from moisture.

General safety guidance (literature/practice)

• Expected hazards: Peptone-based media are generally considered low hazard but can cause dust irritation to eyes, skin, and respiratory tract. Some individuals may exhibit allergic responses to protein hydrolysates.
• PPE: Laboratory coat, safety glasses, and suitable gloves (e.g., nitrile). Use a dust mask or handle in a fume hood if dusting occurs.
• Incompatibilities: Avoid moisture uptake; store away from strong oxidizers. For reconstituted medium, avoid microbial cross-contamination.
• First aid (overview; consult SDS): If inhaled, move to fresh air; if eye contact, rinse cautiously with water for several minutes; if skin contact, wash with soap and water; if ingested, rinse mouth and seek medical advice if unwell.
• Microbiological safety: Once reconstituted and inoculated, handle as biohazard at the appropriate biosafety level for the organism under study. Decontaminate spent media and disposables by autoclaving or validated chemical disinfectants.
• Waste: Dispose per institutional biosafety and local regulations. Autoclave biological waste before discarding.

Authoritative source

• Always defer to the product-specific Safety Data Sheet (SDS) and your institution’s biosafety policies for definitive hazard, exposure controls, and emergency procedures.

Solvent Selection

Applicability note

• As a dehydrated microbiological medium, Peptone Water Medium is intended for reconstitution in purified water. Conventional organic solvent selection is not applicable.

General/literature guidance for reconstitution

• Solvent: Use high-purity water (e.g., Type II or better). Avoid high TOC or residual disinfectants (e.g., chlorine, ozone) that may inhibit growth.
• Miscibility: Fully miscible with water; no miscibility with most organic solvents is relevant or recommended.
• pH control: The medium has low intrinsic buffering; if a defined pH is required for a specific test, adjust with sterile acid/base after dissolution and before sterilization, per your method.
• Filtration vs autoclave: Most users autoclave the reconstituted medium. If membrane filtration is used for sterilization (e.g., 0.22 µm), confirm that your peptone source does not foul filters excessively and verify post-filtration pH and clarity.

When to choose peptone water vs alternatives (literature)

• Choose peptone water for nonselective pre-enrichment and for tests where minimal media complexity is desired (e.g., indole testing with Kovács/DM reagents, water microbiology pre-enrichment).
• Consider buffered peptone water (BPW) or phosphate-buffered variants when organisms are stress-injured and benefit from osmotic and pH protection; use selective enrichment broths when targeting specific taxa.

Storage and Reconstitution

Item-specific facts (from Product Data)

• Storage conditions (dehydrated powder): Room temperature.
• Shipped in: Normal conditions.

General/literature best practices

• Protection from moisture: The dehydrated powder is hygroscopic. Store tightly sealed in a cool, dry place. Consider desiccant in secondary containment after opening. Avoid repeated freeze–thaw or high-humidity exposure to prevent caking and performance drift.
• Shelf life: Follow the expiration date on the label. After opening, minimize headspace humidity and use within your validated in-use period. Specific shelf-life details are not specified for this item; refer to CoA/Spec Sheet.

Reconstitution (literature guidance)

• Solvent: Use purified/deionized water. Mass-per-liter and target pH are method-dependent and not specified for this item; consult CoA/Spec Sheet or your SOP.
• Sterilization: Autoclave reconstituted medium at 121 °C for ~15 minutes unless your protocol specifies filtration. Allow to cool before use; add heat-labile supplements aseptically after cooling to 45–50 °C.
• Prepared medium storage: If held, store at 2–8 °C, protected from light where relevant. Define and justify hold times by internal validation; inspect for turbidity, precipitate, or pH drift before use.

Disposal

• Unused dehydrated powder: Dispose according to institutional chemical waste procedures. Used or inoculated media: Treat as biohazard; autoclave or disinfect prior to disposal per local regulations.

Notes

• Any product-specific reconstitution factor, composition, and performance criteria are not specified for this item; refer to the product’s CoA/Spec Sheet.

Structure and Identity

Item-specific facts (from Product Data)

• Product name: Peptone Water Medium (SKU: P1523295)
• Grade/Purity: BioReagent
• Storage conditions: Room temperature; shipped under normal conditions
• Research use: For research use only
• CAS, CID, InChIKey, SMILES: Not specified for this item; refer to CoA/Spec Sheet.
• Molecular formula and molecular weight: Not specified for this item; refer to CoA/Spec Sheet.

General/literature description

• Peptone Water Medium is a microbiological growth medium composed primarily of enzymatic digests of protein (peptones) and sodium chloride dissolved in purified water (prepared fresh). It is supplied as a dehydrated powder blend for reconstitution.
• Structural features: This product is a complex mixture of peptides, amino acids, and small nitrogenous compounds (from peptone), plus inorganic salts. As a mixture, it does not have a single defined molecular formula, structure, or stereochemistry.
• 2D “structure” description: Not applicable to complex/undefined mixtures; components encompass short peptide fragments and free amino acids with diverse side chains.

Notes

• Composition and specific raw material source (e.g., casein, meat, plant peptone), peptone lot analysis, and ash or chloride content are mixture-specific and may vary; consult the item’s CoA/Spec Sheet for definitive identity and composition details.

Synthetic Utility

Not a chemical building block

• Peptone Water Medium is a complex biological medium and is not used as a reagent or substrate in synthetic organic chemistry.

Relevant laboratory utility (general/literature)

• Microbial cultivation: Enables biomass generation for downstream enzymology, metabolite sampling, or preliminary strain screening prior to transfer into selective or defined media.
• Assay base: Serves as a simple matrix for qualitative biochemical tests (e.g., indole production) where additional reagents are added post-incubation.

If chemical synthesis context is required

• For biocatalysis or fermentation-driven synthesis, peptone water can support preliminary growth phases, but process media are typically optimized, defined, and buffered; use organism-specific formulations and perform scale-down validation.

Item-specific notes

• Any defined chemical specifications (e.g., ash, chloride content, amino nitrogen) are not specified for this item; consult the CoA/Spec Sheet for suitability in specialized workflows.

Target Specificity

Not applicable to this product type

• Target specificity parameters (e.g., antigen/epitope, clone, isotype, species reactivity) pertain to antibodies or affinity reagents. Peptone Water Medium is a nonselective microbiological growth medium and does not possess biochemical target specificity.

General/literature note

• The medium is broadly supportive of heterotrophic bacteria but is intentionally nonselective; any apparent selectivity arises from incubation conditions or subsequent selective steps, not from intrinsic targeting components.