Antibiotic Detection Medium II - BioReagent

Cat. No.: A1528417

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Descripción general

For testing of sulbactam-sensitive β-lactamase drugs in milk and dairy products

Specifications

Especificaciones y pureza

BioReagent

Condiciones de almacenamiento de almacenamiento

Room temperature

Enviado en

Normal

Grado

BioReagent

Product Line

biological_products

Application Protocols

Item-specific facts (Product Data)

• Manufacturer protocols are not provided in this listing. Refer to CoA/Spec Sheet and your institutional SOPs.

Representative protocols (literature; adapt and validate)

1. Agar diffusion (disk or cylinder‑plate)

• Prepare medium per instructions; sterilize and pour plates to a uniform depth (e.g., ~4 mm). Inoculate with an indicator organism suspension to form a confluent lawn (seed layer or surface spread).
• Apply antibiotic standards (multiple concentrations) and test samples on sterile disks or in stainless cylinders/wells.
• Incubate under organism‑appropriate conditions (commonly 30–37 °C) for the validated time.
• Measure inhibition zone diameters; construct a standard curve and interpolate sample potency.

2. Broth microdilution (if broth form is applicable)

• Dispense sterile medium into microplates. Prepare serial dilutions of antibiotic standards and samples.
• Inoculate with standardized cell density. Incubate and read OD600 or visual turbidity.
• Determine MIC as the lowest concentration preventing visible growth.

Controls and quality checks

• Include sterility controls, negative controls (vehicle), and positive controls (reference antibiotics). Verify pH and plate depth; perform growth promotion testing with the designated organism.

Note

• Exact medium concentration, pH, and organism selection for this item are not specified here.

Biological Roles

Item-specific facts (Product Data)

• This is a laboratory culture/assay medium for life science applications. No biological macromolecules or targets are specified.

General roles in microbiology (literature)

• Nutritional support: Provides carbon, nitrogen, vitamins, and minerals to sustain growth of indicator microorganisms used to reveal antibiotic activity.
• Detection principle: Antibiotic presence is inferred from inhibited microbial growth. The medium enables reproducible lawn formation and diffusion of test articles to generate measurable inhibition zones or growth curves.
• Buffering/pH control: Maintains a near-neutral pH optimal for the designated test organism(s), improving consistency of susceptibility or potency readouts.
• Selectivity/tuning: Certain media formulations include salts (e.g., Ca2+, Mg2+) that modulate antibiotic activity (notably aminoglycosides, tetracyclines), or components that suppress interfering flora. The specific selectivity profile of this item is not specified.

Use contexts (literature)

• Quality control of antibiotic standards, screening of fermentation products, environmental/food residue checks, and method validation exercises.

Limitations (literature)

• Bioassays measure biological activity, not chemical identity or concentration per se. Matrix effects and organism variability necessitate parallel controls and standard curves. For definitive quantitation/identification, pair with orthogonal analytical methods (e.g., LC–MS) when required.

Buffer Applications

Applicability

• This product is a complete or near‑complete culture/assay medium rather than a discrete buffering agent. It is not typically used as a standalone buffer system.

General notes (literature)

• Built‑in buffering: Many antibiotic assay media include phosphate or similar buffers to hold pH within a narrow range that supports consistent microbial response. Exact buffer type and target pH for this item are not specified; refer to CoA/Spec Sheet.
• If additional buffering is required for a specific protocol, prepare a compatible sterile buffer (e.g., phosphate-buffered saline) separately and avoid diluting the medium’s nutrients below validated concentrations.

Practical tip

• Verify pH after sterilization and cooling, as autoclaving can shift pH in complex media. Adjustments to pH should be avoided unless validated for the assay, as they may alter antibiotic activity and diffusion.

Green Alternatives

Context

• As a microbiological growth/assay medium, this product does not typically raise solvent or reagent green-chemistry concerns associated with synthetic transformations. Nevertheless, sustainability can be improved in assay design and waste handling.

Greener practices (literature)

• Reduce solvent use: Prefer agar diffusion or broth microdilution assays over extraction‑intensive chemical methods when scientifically appropriate, thereby reducing organic solvent consumption.
• Energy efficiency: Optimize autoclave cycles (validated liquid and gravity settings) and batch sizes to minimize energy while ensuring sterility.
• Waste reduction: Prepare only the volume required for a given batch of plates/broth. Use reusable glassware where compatible with sterility requirements.
• Safer disposals: Autoclave spent media and plates, then dispose via biohazard waste streams. Avoid bleach mixing with media containing high organic load to limit chlorinated byproduct formation; follow institutional EHS guidance.
• Biobased sourcing: Where available, choose media components from sustainably sourced peptones/agar. Item-specific sourcing for this product is not specified.

Comparison table (literature)

• Approach: Agar diffusion vs HPLC antibiotic quantitation • Resource use: Low water/energy vs organic solvents and column waste • Throughput: Medium-to-high (plates) vs high (autosampler) • Specificity: Bioactivity-based (class-agnostic) vs analyte-specific • Tradeoff: Biological variability vs analytical specificity/linearity

Pharmaceutical Uses

Scope

• No therapeutic/clinical claims. This medium is intended for research and laboratory use only (per Product Data: Research Use Only). The following discusses formulation/manufacturing quality control contexts.

Manufacturing/QC applications (literature)

• Compendial bioassays: Antibiotic potency testing by cylinder‑plate or turbidimetric methods described in pharmacopeias (e.g., USP/EP) relies on specific media to ensure standardized growth and diffusion characteristics. While this listing does not assert compendial equivalence, Antibiotic Detection Medium II may be used in analogous laboratory methods where validated.
• Environmental monitoring and residue screening: Screening for antibiotic carryover in manufacturing areas, utilities, or excipients via growth inhibition on inoculated plates prepared with a suitable detection medium.
• Fermentation monitoring: Tracking antibiotic production in discovery or process-development fermentations by periodic bioactivity testing of culture supernatants against an indicator lawn.

Operational considerations (literature)

• System suitability: Include positive controls (reference antibiotic standards) and negative controls (blank solvent) in each run. Define acceptance ranges for inhibition zones or turbidity responses.
• Matrix checks: Validate sample preparation (dilution, pH neutralization, solvent content) to avoid false positives/negatives due to growth effects unrelated to antibiotics.

Regulatory note

• For GMP/GLP or compendial assays, verify media composition, pH, GPT results, and lot documentation against method requirements. Item-specific documentation should be consulted.

Physical Properties

Item-specific facts (Product Data)

• Physical state/appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight/formula: Not applicable to mixtures; not specified for this item.
• Storage conditions: Room temperature (per Product Data)

General properties of dehydrated microbiological media (literature)

• Typical form: Free-flowing, tan-to-beige dehydrated powder that dissolves in purified water; clarity depends on formula (broth vs agar-containing for plates).
• Solubility: Freely soluble or dispersible in water; insoluble in organic solvents.
• pH (at use concentration): Often adjusted within pH ~6.0–8.0 depending on the target assay; exact pH for this item is not specified.
• Density/bulk density: Highly formulation-dependent; often 0.4–0.7 g/mL as powder (approximate ranges; literature), but item-specific values are not provided.
• Melting/boiling point, refractive index, logP, pKa: Not applicable/meaningful for undefined mixtures; not specified for this item.

Practical notes (literature)

• Dissolution: Sprinkle powder into vigorously stirred room‑temperature water to avoid clumping; allow full hydration (10–20 min). Heat gently if agar is present to achieve complete melting/clarity prior to sterilization.
• Water quality: Use deionized/distilled water. Endotoxin or TOC limits are only relevant for specialized applications and are formulation-specific.
• Filtration vs autoclave: Broths may be sterilized by autoclaving; heat-sensitive supplements are aseptically added after cooling. Follow item-specific instructions (not provided here).

Quality and Grades

Item-specific facts (Product Data)

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

What BioReagent grade generally implies (literature)

• Intended for research and laboratory use, including microbiological culture and assay workflows.
• Focus on consistency of growth performance (e.g., support of indicator strains, reproducible inhibition zones) rather than analytical purity of a single compound.
• Quality attributes often evaluated for such media include: growth promotion testing (GPT) with specified organisms, pH at defined concentration, clarity, and performance in standard antibiotic assay formats. Item-specific acceptance criteria should be confirmed on the CoA.

Stabilizers/additives

• Not specified for this item; refer to CoA/Spec Sheet. Some dehydrated media incorporate buffering salts or selective agents. Heat-labile supplements (e.g., vitamins) are typically added post‑sterilization where applicable.

Practical quality notes

• Lot-to-lot comparability is essential for zone-of-inhibition or cylinder‑plate assays. Retain a reference lot when validating methods.
• If the medium is intended to meet compendial methods (e.g., USP/EP antibiotic assay media), confirm alignment with the targeted pharmacopeial recipe and quality tests on the CoA; this listing does not assert compendial status.

Reaction and Applications

Scope for this product type

• This item is a microbiological medium, not a chemical reagent for synthesis. It is used to detect and/or quantify antibiotic activity via microbial growth response.

Applications (literature)

• Disk diffusion (Kirby–Bauer style) or cylinder‑plate assays: Measure zones of inhibition around antibiotic-impregnated disks or cylinders placed on inoculated agar prepared with the detection medium. Zone diameter correlates with antibiotic potency within validated ranges.
• Seed/lawn layer assays: Two-layer methods where a base agar is overlaid with a seed layer containing the indicator organism in the detection medium to enhance sensitivity and uniformity.
• Screening of antibiotic residues: Qualitative detection in food, water, or bioprocess samples by observing growth inhibition patterns after sample application.
• MIC screening (broth form): When the formulation is supplied or adapted as broth, can support microdilution tests to estimate minimal inhibitory concentrations (MIC) following CLSI/ISO guidelines (method-specific media requirements apply).

Practical considerations (literature)

• Indicator organisms: Commonly Bacillus or Micrococcus spp. for many compendial antibiotic assays; selection depends on the antibiotic class.
• Standardization: Calibrate with known antibiotic standards to generate reference curves. Control inoculum density (e.g., 0.5 McFarland for diffusion tests) and plate depth (e.g., ~4 mm) to ensure reproducibility.
• Environmental factors: Incubation temperature, pH, Ca2+/Mg2+ content, and agar concentration can influence diffusion and activity, especially for aminoglycosides and tetracyclines.

Reaction Conditions

Not applicable as a chemical reaction reagent

• This product is not used to run chemical reactions. Instead, it is used under microbiological incubation conditions.

Typical microbiological assay conditions (literature; general guidance, not item-specific)

• Reconstitution: Dissolve the specified grams of dehydrated medium per liter of water (exact value for this item is not specified; refer to CoA/Spec Sheet). If agar is present, heat to fully dissolve. Adjust pH only if instructed by the validated method.
• Sterilization: Autoclave at 121 °C for 15–20 min (liquid cycle). Cool to ~45–50 °C before adding heat‑labile supplements and pouring plates. Parameters should be validated for your load/volume.
• Inoculation: Prepare an indicator organism suspension standardized to an appropriate turbidity (e.g., ~0.5 McFarland for diffusion assays). Spread or overlay to create a uniform lawn.
• Assay setup: Apply antibiotic standards and test samples via disks, wells, or cylinders. Control plate depth (commonly ~4 mm) and incubation temperature (organism‑specific, often 30–37 °C).
• Readout: Measure inhibition zones after a defined incubation time or monitor turbidity/OD for broth methods. Include system suitability checks per method SOP.

Note

• Exact concentrations, pH, and organism strains for this specific product are not provided here. Consult the CoA/Spec Sheet and your method requirements.

Safety and Handling

Item-specific facts (Product Data)

• GHS classification, signal word, pictograms, H-statements: Not specified for this item; refer to SDS.
• Shipping: Shipped under normal conditions (per Product Data).
• Storage: Room temperature (per Product Data).

General safety guidance for dehydrated culture media (literature; defer to SDS)

• Hazards: Generally regarded as low hazard, but treat as laboratory chemical. Avoid inhalation of dust and contact with eyes/skin. Some formulations may contain components that are irritating. Exact hazards depend on composition.
• PPE: Laboratory coat, safety glasses, disposable nitrile gloves. Use a dust mask or work in a fume hood/BSL cabinet if generating aerosols during weighing.
• Handling: Minimize dust. Use clean, dry tools. Avoid microbial contamination of the container; promptly reseal after use.
• Incompatibilities: Strong oxidizers and strong acids/alkalis may degrade medium components. Keep away from moisture to prevent clumping and microbial growth.
• First aid (overview; consult SDS): If inhaled, move to fresh air. If in eyes, rinse cautiously with water for several minutes; remove contact lenses if easy to do. If on skin, wash with soap and water. If ingested, rinse mouth and seek medical advice. Provide SDS to medical personnel.
• Microbiological risk: After reconstitution and inoculation, treat all cultures and used media as biohazardous waste. Autoclave prior to disposal according to institutional biosafety procedures.

Solvent Selection

Item-specific facts (Product Data)

• Primary solvent for use: Water (implied for culture media). Specific reconstitution instructions are not provided; refer to CoA/Spec Sheet.

General guidance (literature)

• Polarity and miscibility: Dehydrated media are formulated to be fully water-soluble or dispersible; organic solvents are neither required nor recommended.
• Water quality: Use freshly prepared deionized/distilled water. For sensitive assays, low-conductivity, low-TOC water can reduce background.
• Additives: Antibiotic standards and test samples are typically prepared in water, saline, or appropriate aqueous buffers. Organic co-solvents (e.g., DMSO, methanol) should be minimized, as they can alter microbial growth and diffusion profiles. Keep final organic solvent content ≤1–2% v/v when unavoidable (literature guidance).

Comparison (literature)

• Broth vs agar media: Agar-containing formulations are used for plates (disk diffusion/cylinder‑plate). Broths are used for turbidity-based detection in microdilution tests.
• Buffered vs unbuffered: Buffered media maintain pH stability during incubation, improving reproducibility of inhibition zones; unbuffered media may exhibit greater variability, especially with metabolically active strains.

Tip

• Degas hot agar before pouring plates to reduce bubbles. Avoid overheating to limit Maillard reactions that could darken media and affect assay optics.

Storage and Reconstitution

Item-specific facts (Product Data)

• Storage conditions: Room temperature
• Shipped: Normal conditions
• Appearance/reconstitution specifics: Not specified for this item; refer to CoA/Spec Sheet.

General guidance for dehydrated media (literature)

• Storage: Keep tightly closed in the original container at ambient temperature in a dry place. Protect from humidity and microbial contamination. Do not use if caked, discolored unusually, or past the recommended retest date.
• Reconstitution: Weigh the specified grams per liter (value not provided for this item). Add to purified water with vigorous stirring. If agar is present, heat until fully dissolved and clear. Avoid overheating to minimize component degradation.
• Sterilization: Autoclave at 121 °C for 15–20 minutes unless otherwise specified. Cool to ~45–50 °C before adding heat‑labile supplements and pouring plates.
• Working solutions: Store prepared broth at 2–8 °C and use promptly (typically within 1–2 weeks if sterile and unopened). Store poured plates inverted in sealed bags at 2–8 °C; allow to equilibrate to room temperature and dry surface before use. Exact shelf lives depend on composition and local validation.
• Freeze–thaw: Not applicable to the dry powder. Avoid freezing hydrated media unless validated, as freezing can alter gel strength and performance.

Always consult the product’s CoA/Spec Sheet and your SOPs for item-specific instructions.

Structure and Identity

Item-specific facts (Product Data)

• Product type: Complex microbiological culture medium (mixture), not a single defined chemical entity
• SKU: A1528417
• Product name: Antibiotic Detection Medium II
• Grade: BioReagent
• CAS, InChIKey, SMILES, molecular formula, molecular weight: Not specified for this item; refer to CoA/Spec Sheet.

General description (literature)

• Composition: Antibiotic “detection/assay” media are typically dehydrated blends of peptones/tryptones, yeast/beef extracts, carbohydrates, mineral salts, and buffers adjusted to a defined pH to support indicator microorganisms while revealing antibiotic activity by growth inhibition. Exact composition and pH vary by standard (e.g., USP/EP “Antibiotic Assay Media”).
• Structural features: As a dehydrated powder, the material comprises heterogeneous biopolymer/protein hydrolysates, amino acids, peptides, carbohydrates, and salts. No single 2D chemical structure applies.
• Functional role: Serves as a nutrient and buffering matrix enabling diffusion-based antibiotic detection (e.g., cylinder-plate, disk diffusion) or growth-based screening.

2D/functional depiction in words (literature)

• Imagine a heterogeneous blend where peptides and amino acids provide nitrogen and growth factors, carbohydrates serve as carbon sources, and phosphate or similar buffers stabilize pH. Agar may be included if formulated for solid media (plates); otherwise, the powder forms a broth after dissolution and sterilization. Exact ingredients for this specific item are not provided here.

Synthetic Utility

Not applicable to this product type

• Antibiotic Detection Medium II is a microbiological culture/assay medium, not a discrete chemical building block or reagent for organic synthesis. It does not participate as a reactant, catalyst, or solvent in synthetic transformations.

Related laboratory utility (literature)

• The medium can support bioproduction or screening workflows where microbial growth or inhibition informs strain selection or bioactivity discovery. Any downstream chemical synthesis would use separate reagents and solvents.

If your project requires chemical synthesis

• Refer to reagent-grade solvents, catalysts, and building blocks in appropriate categories. Use this medium only for bioassays or culture steps as validated.

Target Specificity

Not applicable to this product type

• Target specificity parameters (e.g., antigen, epitope, isotype, species reactivity) apply to antibodies or affinity reagents. Antibiotic Detection Medium II is a culture/assay medium and has no immunochemical target specificity.

Assay specificity context (literature)

• Biological specificity arises from the chosen indicator microorganism and the antibiotic’s mode of action, not from the medium itself. The medium’s role is to provide consistent growth and diffusion characteristics to enable discrimination of active antibiotics.