Antibiotic Medium 32 (USP) - BioReagent

Cat. No.: A1528570

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Visão geral

For microbiological assay of antibiotic potency. Preparation method: Weigh 30.8 g of this product in 1 L of distilled or deionized water, heat to boiling until completely dissolved, dispense, autoclave at 121°C for 15 minutes. After sterilization, shake well to prevent agar from settling and solidifying at the bottom of the vessel, then set aside for use.

Specifications

Especificações e pureza

BioReagent

Condições de armazenamento de armazenamento

Room temperature

Enviado em

Normal

Grau

BioReagent

Product Line

Produtos biológicos

Application Protocols

The following is literature-based, general guidance for microbiological antibiotic assays; adapt to your validated SOP and the USP monograph. Item-specific preparation details and concentrations are Not specified for this item; refer to CoA/Spec Sheet.

A. Preparation of Medium

• Weigh the required grams per liter per CoA.
• Add to purified water with stirring; warm gently to aid dissolution.
• Adjust pH only if directed by the method; avoid over-adjustment.
• Sterilize by autoclaving or 0.22 µm filtration as appropriate.

B. Agar Diffusion Assay (general)

• If agar is required, add per method; sterilize, then cool to ~45–50 °C and pour plates to the validated depth (often ~3–4 mm; confirm per method).
• Prepare a standardized inoculum (e.g., 0.5 McFarland equivalent; confirm organism-specific requirement). Seed plates for a confluent lawn.
• Apply reference standard and sample solutions to wells or disks at specified concentrations.
• Incubate at the organism-specific temperature/time (commonly 30–37 °C for 16–24 h; confirm per method). Measure inhibition zone diameters and compute potency by standard curve.

C. Turbidimetric Assay (general)

• Inoculate sterile broth medium to a defined starting turbidity.
• Add serial dilutions of standard and test sample.
• Incubate with controlled shaking/temperature; read optical density at the designated wavelength; interpolate potency.

Quality controls

• Perform growth promotion testing and assay suitability with reference standards before routine use. Document lot numbers and conditions for traceability.

Biological Roles

As a formulated culture medium, Antibiotic Medium 32 (USP) does not have a single biological role at the molecular level; instead, it provides a defined nutritional environment for microorganisms used in antibiotic potency assays.

• Functional purpose (literature/general):
  • Supplies carbon, nitrogen, vitamins, and minerals to support robust, reproducible growth of specified test organisms, enabling sensitive detection of growth inhibition by antibiotics.
• Typical components and roles (general for USP antibiotic assay media; actual composition Not specified for this item; refer to CoA/Spec Sheet.):
  • Peptones/enzymatic digests: Source of amino acids/peptides supporting growth.
  • Yeast/beef extracts: Provide B-vitamins, growth factors, and trace elements.
  • Mineral salts/buffers: Stabilize osmotic balance and pH during incubation.
  • Agar (if solid medium format is prepared): Creates a semi-solid matrix for diffusion-based assays.
• Organisms (examples from literature):
  • Assay organisms commonly include bacteria such as Staphylococcus aureus, Bacillus subtilis, Micrococcus luteus, or other strains specified by USP monographs, selected for consistent sensitivity to particular antibiotic classes.
• Role in assay reliability:
  • Medium composition and pH influence antibiotic diffusion, stability, and microbial growth rate, thereby affecting zone sizes or turbidimetric responses. Consistency of the medium is central to inter-laboratory comparability in pharmacopeial assays.

Buffer Applications

This product is a complete microbiological medium rather than a conventional buffering reagent. Dedicated buffer preparation guidance is generally not applicable.

• Context (literature/general):
  • Antibiotic assay media often include intrinsic buffering capacity from phosphates or other salts to maintain the target pH during incubation. The specific buffer system and pH range are defined in the relevant USP method for the assay organism and antibiotic class.
• Practical notes:
  • If pH adjustment is required during preparation, follow the USP method and CoA/Spec Sheet for the allowed range and acid/base choices. Over-adjustment can compromise assay performance.
  • For specialized applications needing additional buffering, validate any modifications, as deviations from the standard medium may alter growth and antibiotic activity readouts.

Item-specific buffer composition and pH targets: Not specified for this item; refer to CoA/Spec Sheet.

Green Alternatives

Sustainability considerations for microbiological media focus on resource use, sterilization energy, and consumables. While direct “green solvent” substitutions do not apply, the following strategies (literature/general) can reduce environmental impact without compromising assay integrity:

• Media format choice:
  • Dehydrated medium (this product) prepared on-demand vs. prefilled single-use bottles or ready-poured plates can substantially reduce plastic waste and shipping mass/volume.
• Sterilization efficiency:
  • Optimize autoclave loads and cycles to minimize energy and water consumption while maintaining sterility assurance levels. Use validated liquid cycles and avoid under-filled runs.
  • Where compatible, sterile filtration (0.22 µm) at room temperature may save energy compared to autoclaving, noting the tradeoff of single-use filter plastics.
• Reusable labware:
  • Prefer reusable glass flasks and Petri dishes where permitted; implement validated cleaning/sterilization SOPs to offset lifecycle impacts of disposables.
• Right-sizing and shelf-life:
  • Prepare only the volume required for immediate use to reduce discard of expired plates/broth. Store excess under recommended conditions and for validated durations only (see CoA/Spec Sheet).
• Waste management:
  • Decontaminate biological waste by autoclaving prior to disposal; segregate plastics and packaging for recycling where infrastructure exists. Neutralize any pH-adjusted solutions before drain disposal, following local regulations.

Tradeoffs: Filtration reduces energy but increases plastic; autoclaving enables reuse but consumes steam/water. Select the approach that best aligns with your lab’s validated methods and sustainability goals.

Pharmaceutical Uses

No therapeutic use. For research and quality control laboratory applications only.

• Role in pharmaceutical workflows (literature/general):
  • Antibiotic Medium 32 (USP) is used to support microbiological assays for determining antibiotic potency/content in raw materials and finished products under pharmacopeial methodologies. Such assays are commonly part of manufacturing quality control, method validation, and stability studies.
• Regulatory context:
  • The “USP” designation reflects a standardized medium name used in pharmacopeial methods. Actual compliance or suitability for compendial testing must be confirmed by the laboratory’s validated method and the product’s CoA/Spec Sheet for each lot.
• Advantages of compendial-named media:
  • Facilitates harmonization of assay conditions across sites and over time.
  • Supports comparability when following USP monographs and general chapters for microbial assays of antibiotics.
• Interfacing with QC systems:
  • Record lot numbers and retain CoAs for audits.
  • Perform growth promotion and suitability tests with compendial reference standards and specified test organisms before release to routine use.

Item-specific excipient/ingredient disclosures, endotoxin and bioburden limits, and GMP status: Not specified for this item; refer to CoA/Spec Sheet.

Physical Properties

• Physical state: Dehydrated medium (powdered blend) intended for aqueous reconstitution (general for such products).
• Color/appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Solubility: Freely miscible with purified water to form a clear to slightly opalescent solution/suspension depending on formulation (literature, general for culture media).
• pH (at use concentration): Not specified for this item; refer to CoA/Spec Sheet. (USP antibiotic assay media typically have defined pH ranges when prepared, but values vary by medium number; consult the method/CoA.)
• Density, refractive index, boiling/melting point, logP: Not applicable or not meaningful for a multi-component dehydrated blend; Not specified for this item.
• Hygroscopicity: Many dehydrated media are moderately hygroscopic and may cake if exposed to moisture (literature, general guidance).
• Particle size: Not specified for this item; refer to CoA/Spec Sheet.

Notes on preparation (literature/general):

• Reconstitute with high-purity water (Type I/II or WFI, as appropriate) to the grams-per-liter level specified by the CoA/USP method, then sterilize by autoclaving or membrane filtration as directed for the specific assay format.
• Avoid overheating localized solids during dissolution; heat gently with stirring if needed. Adjust pH only if directed by the method.

Quality and Grades

• Item-specific grade: BioReagent.
  • BioReagent grade indicates suitability for research applications with attention to contaminant control consistent with laboratory biological/biochemical workflows. It does not imply clinical/diagnostic use.
• USP naming context:
  • The product name aligns with the pharmacopeial designation “Antibiotic Medium 32 (USP)”. Actual conformity to USP performance requirements (growth promotion, pH, inhibition response) is batch-dependent; verify via the lot-specific CoA/Spec Sheet. Not specified for this item.
• Typical quality controls for such media (literature/general):
  • Growth promotion testing (GPT) using defined microorganisms.
  • Sterility testing (post-sterilization).
  • pH verification at use concentration.
  • Performance suitability for designated antibiotic assays (e.g., zone sizes or turbidimetric response using reference standards).
• Stabilizers/preservatives: Not specified for this item; refer to CoA/Spec Sheet.
• Trace contaminants (metals, endotoxin, DNA/RNA, etc.): Not specified for this item; refer to CoA/Spec Sheet.
• Documentation and traceability:
  • Use the SKU and lot number to obtain the CoA, method recommendations, and any USP cross-references relevant to your assay configuration.

Reaction and Applications

Chemical reaction applications (e.g., synthesis, catalysis) are not applicable to this product.

Microbiological applications (literature/general):

• Intended use: Antibiotic Medium 32 (USP) is used in microbiological assay systems for determining antibiotic potency/efficacy by agar diffusion (zone of inhibition) or turbidimetric (growth) methods under pharmacopeial protocols. The exact organism(s) and assay configuration depend on the USP monograph specifying this medium.
• Typical workflow elements:
  • Preparation of base medium to the specified concentration (Not specified for this item; refer to CoA/Spec Sheet), adjustment of pH if required by the method, and sterilization.
  • Inoculation with a standardized microbial suspension to create a uniform lawn (agar diffusion) or a defined starting turbidity (turbidimetric assays).
  • Application of reference standard and sample solutions at defined concentrations, followed by incubation and endpoint measurement (zone diameters or optical density).
• Practical considerations:
  • Growth promotion testing validates that the prepared medium supports the designated strain(s) with expected performance.
  • Control of variables—pH, agar depth (for diffusion assays), inoculum density, incubation time/temperature, and plate drying—significantly affects assay precision.
• Documentation:
  • Follow USP chapter guidance and the relevant monograph. Record lot numbers for medium, organisms, and reference standards to ensure traceability.

Reaction Conditions

Not applicable to chemical synthesis.

Microbiological preparation conditions (literature/general for guidance only):

• Reconstitution: Dissolve the specified grams per liter of dehydrated medium in purified water (Not specified for this item; refer to CoA/Spec Sheet.). Mix thoroughly.
• Sterilization: Autoclave using a validated liquid cycle (e.g., 121 °C) for an appropriate hold time, or sterile-filter through a 0.22 µm membrane if heat-labile components are present. Exact parameters depend on vessel volume and equipment validation.
• Agar media: If preparing plates, add agar as directed by the method (if not already included in the formulation), sterilize, cool to ~45–50 °C (literature guidance), then pour into sterile Petri dishes to a validated agar depth.
• Incubation (assay phase): Temperatures and times are organism-dependent (commonly 30–37 °C for 16–24 h in many USP antibiotic assays), but follow the specific monograph or validated SOP.

All values above are general literature guidance. For this item, precise preparation concentration, pH, and sterilization directives are Not specified; consult the CoA/Spec Sheet and your compendial method.

Safety and Handling

• GHS classification, signal word, pictograms, and H-statements: Not specified for this item; refer to the SDS for authoritative safety data.
• General hazards (literature/general for dehydrated media):
  • Low acute toxicity expected; may cause eye/skin/respiratory irritation. Avoid generating dust and inhalation of particulates.
  • Not known to be flammable in solution; dry powder may combust if contacted with strong oxidizers. Keep away from strong acids/bases and oxidizing agents unless compatible by SDS guidance.
• PPE recommendations (follow institutional SOPs):
  • Laboratory coat, nitrile gloves, and safety glasses or goggles. Use a dust mask or work in a fume hood/biological safety cabinet when weighing to minimize inhalation of fine particulates.
• Handling tips:
  • Open containers in low-humidity conditions to reduce clumping from moisture uptake.
  • Use clean, dedicated scoops/spatulas to avoid cross-contamination of microbiological media.
• First aid (overview; defer to SDS):
  • Skin/eye contact: Rinse with water for several minutes; remove contaminated clothing; seek medical evaluation if irritation persists.
  • Inhalation: Move to fresh air; seek medical attention for persistent symptoms.
  • Ingestion: Rinse mouth; do not induce vomiting; obtain medical advice.
• Spill/cleanup:
  • Avoid dust formation; sweep up gently or use HEPA-filtered vacuum; dispose according to local regulations and institutional biosafety policies.
• Fire fighting: Water spray, CO2, dry chemical as appropriate to surroundings; consult SDS.

Solvent Selection

This product is a dehydrated microbiological medium intended for aqueous reconstitution; traditional organic solvent selection is not applicable.

• Primary solvent: Purified water.
  • Water quality (literature/general): Use Type I or Type II laboratory water; for pharmacopeial/sterile applications use Water for Injection (WFI) or equivalent. Avoid water with residual chlorine/chloramine or high TOC that may inhibit growth.
• Miscibility: Fully miscible in water at the specified grams-per-liter concentration (Not specified for this item; refer to CoA/Spec Sheet.).
• Sterilization medium: Prepared medium is typically sterilized by autoclaving (moist heat) or, if heat-labile components are present, by 0.22 µm membrane filtration with aseptic handling (literature).
• When to choose vs alternatives (literature/general):
  • Antibiotic Medium 32 (USP) is chosen to match specific USP microbial assay methods for antibiotic potency. Selection depends on the target organism and antibiotic class specified in the method. If your assay references a different USP Antibiotic Medium number, use that exact medium, as nutrient composition and pH are tailored for the test system.
• Practical tips:
  • Dissolve with moderate stirring; avoid excessive heating that can degrade heat-sensitive nutrients.
  • If precipitates persist, confirm water quality, temperature, and pH alignment per the CoA before proceeding.

Storage and Reconstitution

• Storage conditions (item-specific): Room temperature (per Product Data). Protect from moisture and direct sunlight. Keep container tightly closed; use desiccant if available.
• Shipping (item-specific): Shipped under normal conditions.
• Shelf life: Not specified for this item; refer to CoA/Spec Sheet.

Reconstitution and use (literature/general):

• Concentration: Prepare at the grams-per-liter specified by the CoA/USP method. Not specified for this item; refer to CoA/Spec Sheet.
• Water quality: Use high-purity water (Type I/II or WFI as appropriate to your assay).
• Sterilization: Autoclave using a validated cycle or sterile-filter if heat-labile components are present.
• Post-preparation storage:
  • Broth/agar in flasks: Store at 2–8 °C if not used immediately; minimize storage time to preserve performance (typical lab practice is a few days to 2 weeks depending on medium/closure; validate for your method).
  • Plates: Store inverted in sealed bags or covered containers at 2–8 °C; equilibrate to room temperature and dry surface before use.
• Handling:
  • Avoid repeated warming/cooling cycles which can degrade nutrients and alter pH.
  • Discard if contamination, precipitation, or color change is observed relative to freshly prepared controls.

All unspecified preparation details (pH targets, grams per liter, agar content) are Not specified for this item; consult the lot-specific CoA/Spec Sheet and the relevant USP monograph. For research use only.

Structure and Identity

Antibiotic Medium 32 (USP) is a complex, multi-component microbiological growth medium blend intended for laboratory use in antibiotic assays.

• Item-specific identifiers:
  • CAS: Not specified for this item; refer to CoA/Spec Sheet.
  • InChIKey: Not applicable for complex mixtures.
  • SMILES: Not applicable for complex mixtures.
  • Molecular formula: Not applicable (mixture); Not specified for this item; refer to CoA/Spec Sheet.
  • Molecular weight: Not applicable (mixture); Not specified for this item; refer to CoA/Spec Sheet.
• Composition: Not specified for this item; refer to CoA/Spec Sheet.
• Structural features (general, literature):
  • As a dehydrated culture medium, it typically comprises peptidic/aminaceous hydrolysates (e.g., casein/soy digests), mineral salts, and possibly yeast/beef extracts to support microbial growth during antibiotic potency assays. Exact composition varies by USP definition and manufacturer.
• Form: Dehydrated blend for reconstitution in water (general for such media; item-specific appearance not provided).
• Identity notes:
  • The “USP” designation in the name refers to the pharmacopeial naming convention for antibiotic assay media; verify lot-specific conformity via the CoA/Spec Sheet.

2D structure description: Not applicable. This product is not a single chemical entity but a formulated mixture lacking a definable 2D molecular structure.

Synthetic Utility

Not applicable. Antibiotic Medium 32 (USP) is not used as a synthetic reagent or building block in chemical synthesis. It functions as a microbiological nutrient matrix for bioassays rather than participating in named organic reactions, cross-couplings, or protective group manipulations.

For users seeking synthetic chemistry support, refer instead to solvent and reagent categories appropriate to the target transformation.

Target Specificity

Not applicable. This product is not an antibody, probe, or affinity reagent. It does not possess molecular target specificity.

In the context of microbiological assays (literature/general), the effective “specificity” is determined by the selected test organism(s) and antibiotic, as defined by the pharmacopeial method.

Perguntas frequentes

How should this product be stored?

Store at room temperature.