Antibiotic Medium 8 (USP) - BioReagent

Cat. No.: A1528617

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

개요

For microbiological assay of antibiotic potency. Preparation method: Weigh 25.5 g of this product in 1 L of distilled or deionized water (the volume may be scaled up or down proportionally), 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

사양 및 순도

BioReagent

보관 조건

Room temperature

배송

Normal

등급

BioReagent

Product Line

생물 제품

Application Protocols

No vendor‑validated, item‑specific protocols are provided in the product data. The following are general, literature/USP‑aligned steps for antibiotic potency assay media. Adapt only as permitted by your governing method.

• Preparation (general):
  • Weigh the monograph‑specified mass of dehydrated medium per liter of purified water.
  • Heat to dissolve; adjust pH as specified at 25 °C.
  • Sterilize by autoclaving (e.g., 121 °C) unless otherwise directed. Cool to 45–50 °C before pouring plates (if agar‑containing) or dispensing broth.
• Suitability checks:
  • Perform growth promotion testing with the designated indicator strain(s).
  • Verify final pH and clarity. Discard if precipitation, contamination, or unexpected turbidity is observed.
• Assay setup (overview):
  • Prepare antibiotic standards and samples per USP.
  • Inoculate medium to the prescribed turbidity or lawn density.
  • Execute the turbidimetric or agar diffusion procedure per monograph, including controls and replicates, and compute potency against the standard curve.

Item‑specific preparation strength, organisms, and incubation parameters are Not specified for this item; refer to CoA/Spec Sheet and the current USP.

Biological Roles

Antibiotic Medium 8 (USP) functions as a standardized nutritional and ionic environment to support reproducible microbial growth and antibiotic susceptibility/response in USP potency assays.

• Functional role: Provides amino acids, peptides, vitamins, carbohydrates, and salts that collectively support the metabolism and growth kinetics of the designated indicator organism(s) used in the assay (literature/USP context).
• Assay impact: Medium composition and pH influence cell wall/membrane physiology, enzyme activity, and antibiotic uptake, thereby affecting inhibition zones or turbidity endpoints. Consistency of the medium is critical to assay precision and accuracy.
• Buffering/ionic balance: Inclusion of defined salts and buffering components (per USP formulation) stabilizes pH during incubation, minimizing confounding pH‑dependent antibiotic activity (general principle).
• Growth promotion testing: Before use, GPT verifies that the medium supports characteristic growth without undue inhibition, establishing biological suitability for the intended organism(s) (USP practice).
• Example organisms (literature examples for USP antibiotic assays): Staphylococcus aureus, Bacillus subtilis, Micrococcus luteus, and others are commonly used indicator strains depending on the antibiotic and method; the specific organism for Antibiotic Medium 8 is defined by the USP monograph. Item‑specific organism(s): Not specified for this item; refer to CoA/Spec Sheet/USP.

Use strictly for research, laboratory, or quality control purposes; not for clinical diagnostics in humans or animals unless validated under appropriate regulations.

Buffer Applications

This product is a complete culture medium rather than a simple buffering agent. Although it possesses inherent buffering capacity (via its salts and components), it is not typically used as a standalone buffer system for biochemical assays or chromatography.

• If a defined buffer is required (e.g., phosphate, citrate, HEPES), prepare and use that buffer separately according to your protocol.
• For antibiotic potency assays, use the medium exactly as specified by the USP monograph; altering buffer systems can change assay outcomes.

Green Alternatives

While “green alternatives” typically refer to replacing hazardous solvents or reagents, sustainability considerations also apply to culture media workflows.

• Dehydrated vs. ready‑to‑use media:

  • Dehydrated media (this product) minimize transportation mass and volume, reducing carbon footprint relative to pre‑poured plates or bottled broths (general sustainability principle).
  • On‑site preparation allows right‑sizing of batch volumes, lowering waste from expired ready‑to‑use products.

• Resource efficiency (general guidance):

  • Prepare only the volume required for the planned assays; validate maximum usable shelf life under your storage conditions to avoid discards.
  • Use energy‑efficient autoclave cycles and load sterilizers fully to optimize steam and power usage, consistent with sterility assurance.
  • Where acceptable by method, sterile filtration of small volumes can reduce autoclave cycles.

• Animal‑origin considerations:

  • Some antibiotic assay media include animal‑derived peptones/extracts. If animal‑free sourcing is a sustainability or regulatory goal, evaluate availability of plant‑based alternatives validated to meet USP performance (literature/general). Item‑specific origin: Not specified for this item; refer to CoA/Spec Sheet.

• Packaging:

  • Recycle secondary packaging where facilities exist. Resealable, moisture‑barrier primary containers help extend shelf life and reduce waste through caking prevention.

Balance sustainability steps with strict adherence to USP method requirements to preserve assay validity.

Pharmaceutical Uses

In pharmaceutical quality control, Antibiotic Medium 8 (USP) is used as a standardized culture medium for microbiological potency assays of antibiotics as directed by USP monographs and general chapters (literature/USP context). No therapeutic/clinical use is implied.

• Role: QC assay medium supporting compendial testing (e.g., turbidimetric or agar diffusion methods) to quantify antibiotic potency by comparison with reference standards.
• Compliance: Selection of a USP‑named medium facilitates alignment with compendial expectations for method suitability and can streamline validation and regulatory acceptance, provided lot‑specific performance (GPT, pH) is verified.
• Formulation/Manufacturing interface: Used to assess incoming raw materials (antibiotics), in‑process controls, and finished products for potency by microbiological methods when required by monograph or regulatory strategy.
• Documentation: Maintain traceability of medium lot numbers, preparation records (mass, volume, pH adjustment), sterilization parameters, and growth promotion/suitability results within GMP data systems.

Item‑specific pharmacopeial references, composition, and pH targets: Not specified for this item; refer to CoA/Spec Sheet and the current USP.

Physical Properties

As a dehydrated medium, properties are characteristic of complex blends rather than a single compound. Item‑specific numeric specifications are not provided here.

• Physical form/appearance: Dehydrated powder or granules (general for media). Specific appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Color/odor: Typically light to tan; characteristic nutrient odor (literature, varies by lot and suppliers). Item‑specific: Not specified for this item; refer to CoA/Spec Sheet.
• Solubility: Designed to be readily soluble/dispersible in purified water to the target preparation strength (literature/guideline). Exact reconstitution mass per liter: Not specified for this item; refer to CoA/Spec Sheet/USP monograph.
• pH (prepared medium): Controlled within a USP‑specified range at 25 °C (literature, medium‑dependent). Item‑specific pH range: Not specified for this item; refer to CoA/Spec Sheet.
• Melting/boiling point, density, refractive index, logP: Not applicable/meaningful for a dehydrated multi‑component medium.
• Autoclave stability: Formulated to withstand standard sterilization (e.g., 121 °C, saturated steam) without loss of performance when used as directed (general microbiology practice; verify against USP/CoA).

Important: Use USP‑grade water (meets Purified Water specifications) and follow the USP monograph for preparation strength and pH adjustment to ensure assay performance.

Quality and Grades

• Item grade: BioReagent

  • Meaning: Suitable for biological research applications, including microbiological culture and QC assay workflows. Emphasis on low bioburden/contaminants that could interfere with microbial growth tests.
  • Implication: Lots are selected to meet performance criteria relevant to biological assays (growth promotion, expected turbidity/zone formation per USP methods, as applicable). Item‑specific acceptance criteria: Not specified for this item; refer to CoA/Spec Sheet.

• USP context: “Antibiotic Medium 8 (USP)” denotes a formulation aligned with a USP monograph for antibiotic assay media. Compliance typically involves:

  • Composition and preparation strength per monograph (literature/USP).
  • Performance tests using specified indicator organisms (e.g., growth promotion, inhibitory capacity controls; literature/USP).

• Stabilizers/additives: Culture media may include buffers/salts to control pH and osmolarity. Any stabilizers or anti‑caking agents present would be declared on the CoA/spec; Not specified for this item; refer to CoA/Spec Sheet.

• Practical notes for QC:

  • Verify lot‑specific growth promotion testing (GPT) results and pH of prepared medium against the CoA before regulated use.
  • Maintain traceability (lot number, preparation date, sterilization cycle) to support GMP/GLP records when used in pharmaceutical quality control settings.

For definitive specifications (composition, pH targets, GPT organisms/criteria), consult the current USP and the product CoA.

Reaction and Applications

This product is not a chemical reagent for synthesis; it is a culture medium formulated for microbiological assays of antibiotics per USP methodology.

Representative applications (literature/USP context):

• Quantitative antibiotic potency assays (turbidimetric or cylinder‑plate/agar diffusion), where Antibiotic Medium 8 (USP) provides standardized nutritional conditions for the indicator organism, ensuring sensitivity and reproducibility.
• Growth promotion testing (GPT) and suitability testing in pharmaceutical QC to verify medium performance prior to assay use.
• Routine cultivation and standardized inoculum preparation for specified test organisms when directed by the USP method.

Practical tips (general microbiology practice):

• Prepare the medium at the monograph‑specified concentration and pH; deviations can shift organism growth rate and alter inhibition profiles.
• Control variables rigorously: inoculum age/density, incubation temperature/time, and plate depth (for diffusion assays) strongly influence assay outcome.
• Use calibrated dispensers and level benches to achieve uniform plate depth if casting agar plates.
• Perform parallel reference standard assays to generate a standard curve for potency estimation, as required by USP assay design.

Note: Consult the specific USP chapter/monograph that references Antibiotic Medium 8 for the designated organism(s), assay format, and acceptance criteria. Item‑specific directions are Not specified for this item; refer to CoA/Spec Sheet.

Reaction Conditions

For this product, “reaction conditions” correspond to medium preparation and sterilization conditions rather than chemical reactions. The following are general microbiology practices; always confirm with the USP monograph and CoA for this specific medium.

• Reconstitution (general): Disperse the specified mass of dehydrated medium into purified water with stirring. Heat as needed to ensure complete dissolution; if agar is included, bring to near boiling to melt.
• pH adjustment (literature/USP): Adjust to the monograph‑specified pH at 25 °C using sterile acid/base (e.g., HCl/NaOH) as required. Item‑specific pH targets: Not specified for this item; refer to CoA/Spec Sheet.
• Sterilization: Autoclave at 121 °C (15 psi) for an appropriate hold time (e.g., 15 minutes for typical volumes) unless otherwise directed by the USP method. Allow to cool to 45–50 °C before pouring plates or adding heat‑labile supplements (general practice).
• Storage of prepared medium (general): Store in the dark to protect light‑sensitive components. Use within a validated in‑use shelf life; prolonged storage can alter pH and performance.
• Controls: Perform growth promotion testing and, where required, method suitability tests with the specified indicator organism(s) and reference standards before routine use (USP practice).

Exact preparation strength (g/L), pH range, and organism requirements are method‑dependent and are Not specified for this item; refer to CoA/Spec Sheet and the current USP.

Safety and Handling

• GHS classification: Not specified for this item; refer to SDS.
• Signal word / H‑statements / pictograms: Not specified for this item; refer to SDS.

General laboratory safety (good practice for dehydrated culture media):

• PPE: Wear lab coat, safety glasses, and appropriate gloves. Use a dust mask/respirator if handling large quantities that may generate dust.
• Avoid creating dust and inhalation; may cause mechanical irritation to respiratory tract and eyes (general for nutrient media powders).
• Hygiene: Wash hands thoroughly after handling. Do not eat, drink, or smoke in the lab.
• Incompatibilities: Store away from strong oxidizers and moisture. Keep containers tightly closed to prevent caking and microbial contamination.
• First aid (general): If inhaled, move to fresh air; for eye/skin contact, rinse with water. If ingested, rinse mouth and seek medical advice if symptoms occur. Always consult the product SDS for authoritative measures.
• Sterilization hazards: When autoclaving prepared medium, do not tightly cap vessels; allow pressure equilibration. Beware of superheated liquids; open only after pressure normalizes. Hot agar (if used) can cause burns—handle with heat‑resistant gloves.
• Biohazard note: Once inoculated, all cultures and spent media must be treated as biohazardous waste and decontaminated per institutional biosafety procedures (e.g., autoclave before disposal).

Always defer to the product SDS and institutional EHS guidance for final safety instructions.

Solvent Selection

This product is a microbiological medium intended to be reconstituted in water rather than used as an organic solvent.

• Primary solvent: Purified water (meeting USP Purified Water specifications) is recommended for reconstitution (literature/USP practice).
• Miscibility: Upon heating and stirring, the dehydrated medium dissolves/disperses uniformly in water. If agar is included, full melting requires heating to near boiling prior to sterilization (literature/general practice).
• Filtration vs. thermal sterilization:
  • Heat‑labile supplements (if any) should be sterile‑filtered separately (0.22 μm) and added aseptically to cooled (45–50 °C) sterile medium.
  • Basal medium is typically sterilized by autoclaving in water (e.g., 121 °C), unless otherwise specified in the USP monograph/CoA.
• Water quality considerations:
  • Use freshly produced, low‑endotoxin purified water to minimize background turbidity and ionic variability.
  • Avoid high‑hardness water that can precipitate phosphates or alter buffering capacity.

Comparison (literature, general):

• Purified water: Standard for media prep; neutral pH; minimizes unknowns.
• Buffered diluents (e.g., PBS): Not typically used to constitute USP antibiotic assay media unless explicitly directed, as buffers can alter assay response.

Refer to the USP monograph/CoA for exact preparation strength (g/L) and any specified pH adjustments.

Storage and Reconstitution

• Storage (as supplied): Room temperature (per Product Data). Keep container tightly closed in a cool, dry place. Protect from moisture and prolonged exposure to air and light to prevent caking and degradation. Shipping: Normal (per Product Data).
• Shelf life: Not specified for this item; refer to CoA/Spec Sheet.

Reconstitution and use (general microbiology guidance; consult USP/CoA for specifics):

• Water: Use USP Purified Water or equivalent laboratory‑grade purified water.
• Concentration: Prepare at the monograph‑specified mass per liter. Item‑specific g/L: Not specified for this item; refer to CoA/Spec Sheet/USP.
• Dissolution: Add powder to water with vigorous stirring. Heat as needed to dissolve fully; if agar is present, bring to near boiling to melt.
• pH: Adjust to the specified value at 25 °C using sterile acid/base as required (USP guidance). Item‑specific pH: Not specified for this item; refer to CoA/Spec Sheet.
• Sterilization: Autoclave at 121 °C for an appropriate hold time unless otherwise instructed by the USP method. For heat‑labile additives, sterile‑filter and add aseptically to cooled sterile medium.
• Storage after preparation: Store cooled plates or aliquots protected from light. Typical storage 2–8 °C is common for prepared media (literature); validate in‑use stability for your application.

Research Use Note: For research use only.

Structure and Identity

Antibiotic Medium 8 (USP) is a defined microbiological culture medium per the United States Pharmacopeia, supplied as a dehydrated, multi‑component mixture. It is not a single chemical entity and therefore has no single molecular formula or structure.

• Product type: Dehydrated culture medium (USP antibiotic assay medium)
• Composition: Complex, multi‑component (typical constituents for USP antibiotic media include peptones/tryptones, yeast/beef extract, mineral salts, carbohydrates, and, in solid formulations, agar). Exact composition should be taken from the USP monograph and the product CoA/specification.
• Molecular formula: Not applicable for a mixture; Not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight: Not applicable for a mixture; Not specified for this item; refer to CoA/Spec Sheet.
• SMILES / InChI / InChIKey: Not applicable for multi‑component media.
• Structural features (descriptive): Heterogeneous blend of peptides, amino acids, vitamins, trace minerals, and salts formulated to support growth of specified assay organisms and provide suitable ionic/osmotic balance.

Note: “USP” indicates conformance to pharmacopeial composition/performance criteria for specified antibiotic potency assays (general microbiology chapters). Always consult the current USP monograph for definitive details.

Synthetic Utility

Not applicable. Antibiotic Medium 8 (USP) is a biological culture medium and is not used as a reagent or building block in chemical synthesis. For chemical transformations, refer to appropriate reagents and solvents. See sections “Reaction & Applications” and “Reaction Conditions” for microbiology‑focused guidance instead.

Target Specificity

This section typically applies to antibodies or affinity reagents. Antibiotic Medium 8 (USP) is a culture medium and does not possess target binding specificity.

• Target/epitope/clone/isotype: Not applicable.
• Species reactivity: Not applicable.

For organism suitability in USP antibiotic assays, consult the relevant USP monograph; item‑specific organisms are Not specified for this item; refer to CoA/Spec Sheet.