Antibiotic Medium 3 (USP) - BioReagent

Cat. No.: A1528528

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Overview

For microbiological assay of antibiotic potency. Preparation method: Weigh 17.5 g of this product in 1 L of distilled or deionized water, heat with stirring and boil until completely dissolved, dispense, autoclave at 121°C for 15 minutes, cool, and set aside for use.

Specifications

Specifications & Purity

BioReagent

Storage

Room temperature

Shipped In

Normal

Grade

BioReagent

Product Line

biological_products

Application Protocols

Item-specific, validated protocols and test parameters are not provided here. Refer to your laboratory SOP, relevant pharmacopeial methods, and the product CoA/Spec Sheet.

General workflow outlines (literature/general knowledge):

• Cylinder-plate assay: Prepare sterile agar medium, adjust pH as required, pour plates, seed with standardized inoculum, apply cylinders or wells with reference standards and samples, incubate, measure inhibition zones, and compute potency from standard curves.
• Turbidimetric assay: Prepare sterile broth medium, inoculate with standardized cell density, add standards and samples across a concentration range, incubate with controlled shaking/temperature, measure turbidity (OD) at defined times, and determine potency via regression against standards.

Critical controls:

• Include assay control organisms from authenticated sources.
• Verify growth promotion and system suitability for each batch of prepared medium.
• Calibrate pipettes, spectrophotometers, and incubators used in the assay.

Note: Exact medium concentration (g/L), inoculum size, incubation temperature/time, and pH targets are method-specific and Not specified for this item.

Biological Roles

As a culture medium, this product’s role is to provide nutrients and ionic conditions that support the growth of specific bacterial test organisms used in microbiological assays (literature/general knowledge).

• Growth support: Supplies amino acids/peptides, vitamins, minerals, and carbon sources to sustain reproducible microbial growth rates over the assay window.
• Assay selectivity: The nutrient balance and pH influence organism sensitivity to antibiotics, enabling construction of reliable dose–response curves for potency determination.
• Matrix consistency: Well-prepared medium minimizes background turbidity and variability, which is critical in turbidimetric assays that rely on optical density measurements.
• Reproducibility: Consistent medium performance underpins inter-laboratory comparability in pharmacopeial antibiotic assays.

Note: Specific organisms and formulation parameters associated with “Antibiotic Medium 3” in compendial texts vary by method and antibiotic and are not specified for this catalog item; consult the USP monograph relevant to your assay and the product CoA/Spec Sheet for lot-specific growth promotion results if available.

Buffer Applications

This product is a complex culture medium rather than a defined buffering reagent. While media often contain buffering components to stabilize pH during microbial growth (literature/general knowledge), this item is not intended as a stand-alone buffer system.

• If a defined buffer is required for your protocol (e.g., phosphate, MOPS, HEPES), prepare it separately according to the method and combine with the medium only if compatible with your validated assay.
• For antibiotic potency assays, follow the compendial method’s specified pH targets and adjust the final medium pH at the working temperature using sterile acid/base solutions as directed by your SOP.

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

Green Alternatives

While “green chemistry” comparisons are more common for solvents and reagents, sustainable practices also apply to culture media preparation and use (literature/general knowledge):

• Energy efficiency: Optimize autoclave loads and use validated minimum sterilization cycles to reduce energy consumption without compromising sterility.
• Water stewardship: Prepare only the volume needed for the assay to minimize disposal of unused sterile medium. Use recirculating chillers rather than running tap water when cooling media bottles.
• Waste minimization: Employ reusable glassware where compliant with your QA system; decontaminate and reuse bottles/flasks to reduce single-use plastics.
• Process alternatives: For workflows tolerant to filtration, sterile filtration of heat-labile components can avoid repeated autoclave cycles.

Illustrative comparison (general guidance):

• Approach A (standard): Autoclave full batch volumes; potential for over-preparation and energy use.
• Approach B (greener): Prepare smaller, just-in-time batches; combine autoclave loads across labs/shifts; validate shorter cycles; segregate biohazard waste for efficient treatment.

Trade-offs: Reduced batch sizes can increase labor overhead; filtration may not be feasible for all formulations. Always balance sustainability with method suitability and regulatory requirements for your assay.

Pharmaceutical Uses

No therapeutic or clinical claims are made for this product. For research use only.

Role in pharmaceutical quality workflows (literature/general knowledge):

• Microbiological assay medium used in compendial potency testing of antibiotics. The medium facilitates standardized growth of test organisms to quantify active content in bulk substances and finished dosage forms via cylinder-plate or turbidimetric methods.
• Quality control: Employed in release testing, stability studies, and process validation where microbiological assay is the prescribed or orthogonal method.
• Documentation: Pharmacopeial methods typically require growth promotion testing and system suitability checks; these should be verified with each prepared batch.

Regulatory note: While the product name references “USP,” item-specific confirmation of compendial suitability (composition, pH, performance) is Not specified for this item; refer to CoA/Spec Sheet and your internal method validation.

Physical Properties

• Appearance: Not specified for this item; refer to CoA/Spec Sheet. (Typical for dehydrated media: free-flowing, tan-to-beige powder; literature/general knowledge.)
• Solubility: Water-soluble as a prepared medium (literature/general knowledge). Specific dissolution concentration for this item is not specified; refer to CoA/Spec Sheet.
• pH (at use concentration): Not specified for this item; refer to CoA/Spec Sheet. (Many antibiotic assay media target neutral to slightly acidic/alkaline ranges per method; literature/general knowledge.)
• Density/bulk density: Not specified for this item; refer to CoA/Spec Sheet.
• Refractive index, logP, pKa, boiling/melting point: Not applicable/meaningful for a dehydrated multi-component medium.

Practical notes (literature/general knowledge):

• Dissolution is typically performed in purified or deionized water with gentle heating and stirring to achieve clarity before sterilization by autoclaving or filtration, as method-appropriate.
• Final medium clarity and color can vary with water quality and preparation parameters; avoid overheating to limit Maillard-type darkening in peptide/carbohydrate-containing media.
• Filterability (for turbidimetric assays) depends on full dissolution; undissolved particulates can confound optical measurements.

Quality and Grades

• Grade/Purity (from Product Data): BioReagent.

What BioReagent typically implies (general guidance):

• Suitable for research and laboratory applications where reliable performance and low bioburden are important. While not a clinical/diagnostic certification, BioReagent-grade materials are produced with attention to consistency and functional suitability in life science workflows.

USP context (name reference, general knowledge):

• “Antibiotic Medium 3 (USP)” refers to media types used in United States Pharmacopeia antibiotic assay methodologies. This product name indicates intended use category; however, specific compliance characteristics (e.g., composition, pH, growth promotion test results) are Not specified for this item; refer to CoA/Spec Sheet for lot-specific performance data.

Key quality considerations for this medium class (literature/general knowledge):

• Growth promotion testing with specified test organisms relevant to antibiotic assays.
• Sterility and low endotoxin/bioburden prior to use.
• Consistency of buffering capacity, osmolality, and turbidity background to ensure assay precision.

Item-specific specifications such as moisture content, pH range at preparation, or component tolerances: Not specified for this item; refer to CoA/Spec Sheet.

Reaction and Applications

Chemical reaction applications are not applicable. This product is a microbiological culture medium.

Research and analytical applications (literature/general knowledge):

• Antibiotic potency assays: Used to prepare seeded agar or broth for microbiological assay of antibiotics by cylinder-plate (diffusion) or turbidimetric methods as described in pharmacopeial procedures. Medium composition and pH help define the growth rate of the test organism and thereby the sensitivity to the antibiotic standard and samples.
• QC of antimicrobial products: Employed in manufacturing and quality control laboratories to establish dose–response curves with reference standards and to quantify active content in finished products based on inhibition zone diameters or turbidity changes.
• Method validation: Supports system suitability, linearity, and robustness studies for microbiological assays by ensuring consistent growth promotion.

Practical tips (general knowledge):

• Prepare fresh medium and confirm sterility before use. Control pH at the final temperature of use; small pH deviations can shift growth response curves.
• Avoid prolonged overheating; nutrient degradation can elevate background turbidity and alter organism vigor.
• Standardize inoculum density and incubation conditions to reduce inter-assay variability. Include reference standards in parallel with samples for calibration.

Reaction Conditions

Chemical reaction conditions are not applicable to this product.

Preparation conditions for laboratory use (literature/general knowledge):

• Solvent: Purified/deionized water.
• Temperature: Gentle heating (e.g., 50–60°C) to aid dissolution; avoid excessive boiling which can cause caramelization or Maillard reactions in peptide/carbohydrate-containing media.
• Sterilization: Autoclave at validated conditions per your SOP (e.g., 121°C at 15 psi; time depends on volume), or sterile-filter if appropriate for the formulation and assay.
• pH: Adjust at the working temperature to the value specified by the assay method using sterile acid/base.
• Storage post-prep: If not used immediately, store prepared sterile medium as per lab policy (commonly 2–8°C, protected from light) and use within a validated hold time to maintain performance.

Item-specific parameters (e.g., exact grams per liter, target pH, sterilization cycle): Not specified for this item; refer to CoA/Spec Sheet and the applicable compendial method.

Safety and Handling

Safety information specific to this item (GHS classification, signal word, H-statements, pictograms) is not provided here. Always consult the product SDS for authoritative safety data.

General laboratory safety guidance for dehydrated culture media (literature/general knowledge):

• PPE: Wear lab coat, safety glasses, and appropriate gloves. Use a dust mask/respirator if dust generation is likely, as powders may cause respiratory irritation.
• Inhalation/ingestion: Avoid breathing dust; do not ingest. If inhaled, move to fresh air. If swallowed, rinse mouth and seek medical attention if unwell.
• Skin/eye contact: Rinse with water for several minutes; remove contaminated clothing. Seek medical advice if irritation persists.
• Fire and thermal hazards: Organic nutrient media can be combustible in powder form; keep away from ignition sources and minimize dust clouds. During autoclaving, do not tightly seal containers before sterilization to avoid pressure buildup.
• Incompatibilities: Store away from strong oxidizers and moisture. Hygroscopic components may clump on exposure to humidity.
• Microbiological practices: After preparation and inoculation, treat all used media and cultures as biohazardous; decontaminate by autoclaving before disposal.

Storage conditions (from Product Data):

• Storage: Room temperature.
• Shipped in: Normal.

Note: For research use only. Defer to institutional biosafety procedures and the SDS for detailed guidance.

Solvent Selection

This product is a dehydrated culture medium intended to be dissolved in water; conventional organic solvent selection does not apply.

Practical dissolution guidance (literature/general knowledge):

• Primary solvent: Purified, deionized, or distilled water (Type II/Type I as appropriate to your assay sensitivity).
• Typical workflow: Add the recommended mass of medium to the measured water volume with stirring; heat gently (e.g., 50–60°C) to aid dissolution. Avoid localized overheating.
• Clarification: Some components may require brief boiling to fully dissolve; if turbidity persists, allow to hydrate for several minutes before additional heating. Do not add organic solvents.
• Sterilization: Autoclave at validated conditions or sterile-filter if the formulation allows (some peptone-rich media are not easily filterable). Cool to assay temperature before seeding or use.

When to choose this medium vs alternatives (general knowledge):

• Select Antibiotic Medium 3-type formulations when performing USP-referenced antibiotic potency assays (diffusion or turbidimetric), where medium composition and performance characteristics are method-critical. For general cultivation or non-assay applications, standard nutrient broths/agars may be more appropriate.

Storage and Reconstitution

Storage (from Product Data):

• Room temperature. Protect from moisture and excessive heat. Ship under normal conditions.

Reconstitution/preparation:

• Item-specific instructions such as grams per liter, target pH, and sterilization cycle: Not specified for this item; refer to CoA/Spec Sheet.

General preparation guidance (literature/general knowledge):

• Measure the required mass of dehydrated medium and add to purified/deionized water to the desired final volume.
• Stir to disperse; heat gently (50–60°C) to aid dissolution. Avoid scorching or prolonged boiling.
• Adjust pH at working temperature as required by your assay using sterile acid/base.
• Sterilize by autoclaving at validated conditions or by sterile filtration when appropriate.
• For agar-containing formulations, boil to dissolve agar completely before autoclaving; dispense while molten at ~45–50°C if pouring plates.

Post-preparation handling (general):

• Store prepared sterile medium per SOP (often 2–8°C, protected from light) and use within validated hold times to maintain performance.
• Avoid repeated heat cycles. Discard if contamination, precipitation, or significant color change is observed.

Research Use Note: For research use only.

Structure and Identity

Antibiotic Medium 3 (USP) is a dehydrated, multi-component microbiological growth medium formulated for antibiotic assay workflows. Being a complex mixture rather than a single chemical entity, it does not have a unique molecular structure.

• SKU: A1528528
• Product name: Antibiotic Medium 3 (USP)
• Chemical class: Complex culture medium (mixture)
• 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.
• SMILES / InChI / InChIKey: Not applicable to mixtures of undefined composition.
• Structural features (general knowledge): Typically comprises peptones/tryptones, yeast/beef extracts, salts, and potentially carbohydrates or buffering components to support standardized microbial growth for potency assays. Exact composition for this catalog item is not specified; refer to CoA/Spec Sheet.

2D description in words (general context): As a heterogeneous blend of low-molecular-weight amino acids/peptides, carbohydrates, vitamins, nucleotides, and inorganic salts, the medium dissolves in water to yield a nutrient solution that supports growth of assay organisms in turbidimetric or agar diffusion tests (literature/general knowledge).

Synthetic Utility

Not applicable. This product is a microbiological culture medium and is not used as a reagent or building block in chemical synthesis.

For users seeking chemical synthesis guidance, refer instead to reagent-specific documentation relevant to your transformation of interest.

Target Specificity

Not applicable. This product is not an antibody or affinity reagent and has no antigen/epitope specificity.

Any organism specificity or recommended strains for use in antibiotic assays are method-dependent and Not specified for this item; refer to USP methods and your laboratory SOP.

Frequently Asked Questions

How should this product be stored?

Store at room temperature.