Biotin Assay Medium - BioReagent

Cat. No.: B1528646

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Overview

I. Formula (per liter) Glucose 40.0 g Sodium acetate 20.0 g Casamino acids 12.0 g Dipotassium hydrogen phosphate 1.0 g Potassium dihydrogen phosphate 1.0 g Nutrient elements 0.93 g Detailed composition: Casamino acids 12.0 g, riboflavin 2.0 mg, glucose 40.0 g, nicotinic acid 2.0 mg, sodium acetate 20.0 g, calcium pantothenate 2.0 mg, p-aminobenzoic acid 0.2 mg, pyridoxine hydrochloride 4.0 mg, L-cystine 0.2 g, thiamine hydrochloride 2.0 mg, DL-tryptophan 0.2 g, manganese sulfate 20.0 mg, adenine sulfate 20.0 mg, sodium chloride 20.0 mg, guanine hydrochloride 20.0 mg, potassium dihydrogen phosphate 1.0 g, uracil 20.0 mg, dipotassium hydrogen phosphate 1.0 g, ferrous sulfate 20.0 mg, magnesium sulfate 0.4 g. Final pH: 6.8 ± 0.2 (25 ± 5°C) II. Preparation Method (100 mL) Weigh 7.49 g of this product in 100 mL of distilled or deionized water (the volume may be scaled up or down proportionally), heat with stirring and boil until completely dissolved, adjust pH to 6.8 ± 0.2 (25 ± 5°C), dispense (stir well to ensure even distribution of insoluble matter), and set aside for use. III. Precautions 1. Avoid contact with skin and eyes during use. 2. This product is for laboratory testing only.

Specifications

Specifications & Purity

BioReagent

Storage

Room temperature

Shipped In

Normal

Grade

BioReagent

Product Line

Biological Products

Application Protocols

Item-specific protocols are not provided; the following is general, literature‑based guidance for microbiological biotin assays using a biotin assay medium.

1. Medium preparation • Weigh the indicated grams per liter per product label (item-specific; not provided here). Dissolve in purified water with mixing. Adjust pH only if required by your method. Sterilize (autoclave or sterile filter) per SOP. Cool to assay temperature.
2. Inoculum standardization • Revive the biotin‑dependent test organism on a suitable maintenance medium. Prepare a standardized inoculum (e.g., overnight culture diluted to a defined turbidity) to minimize variability. Exact strain/density: follow your method.
3. Calibration curve • Prepare serial dilutions of a certified biotin standard in the prepared assay medium to cover the expected sample range. Include blanks and quality controls (matrix spikes/recoveries).
4. Sample preparation • Apply any specified hydrolysis (acid/enzymatic), neutralization, clarification, and sterile filtration steps to release/protect biotin. Dilute samples into the linear range.
5. Inoculation and incubation • Dispense medium (tubes or microplates), add standards/samples, inoculate with the standardized inoculum, and incubate at the validated temperature/time without shaking unless specified.
6. Measurement and analysis • Measure turbidity at the prescribed wavelength. Construct the standard curve and interpolate sample concentrations, correcting for dilutions and recoveries. Evaluate system suitability and control results against acceptance criteria. Note: Exact organism, incubation conditions, g/L preparation, and QC acceptance criteria are method‑specific and not specified for this item; consult the CoA/Spec Sheet and your validated SOP.

Biological Roles

Context for use (literature/general biology): • Biotin (vitamin B7/Vitamin H) is an essential cofactor for biotin‑dependent carboxylases (e.g., acetyl‑CoA carboxylase, pyruvate carboxylase, propionyl‑CoA carboxylase). It participates in CO2 transfer reactions central to fatty acid synthesis, gluconeogenesis, and amino acid catabolism. • Many microorganisms used in microbiological assays are auxotrophic for biotin. Their growth is limited in a biotin‑deficient medium and restored proportionally upon addition of biotin, enabling quantitative analysis. • The assay medium is formulated to supply all required nutrients except biotin (or with biotin at limiting concentration), so growth becomes the analytical signal. The organism’s biotin transporter and carboxylase activity translate external biotin into biomass accumulation measurable by turbidity. • Matrix effects: Proteins can bind biotin tightly; hydrolysis or enzymatic treatments may be required to liberate biotin prior to assay (literature). Interferents such as antibiotics or preservatives in samples may suppress growth; appropriate controls and dilution mitigate bias. • While the medium itself has no intrinsic biological function beyond supporting growth, its composition is optimized to be non‑limiting for factors other than biotin so that the growth response is specific and proportional over a defined working range (details method‑dependent). Item‑specific organism compatibility and dynamic range: Not specified for this item; refer to CoA/Spec Sheet or validated method.

Buffer Applications

This product is not a standalone buffering agent; it is a complete (or semicomplete) culture medium blend intended to be dissolved in water. As such, it is not typically used to prepare general laboratory buffers or electrophoresis solutions. General notes (literature): • Many microbiological media incorporate buffering components (e.g., phosphate, citrate) to maintain pH near neutrality during incubation, aiding reproducibility in growth‑response assays. Exact buffering system and target pH for this item: Not specified; refer to CoA/Spec Sheet. • If your bioassay protocol specifies a particular pH, verify and adjust the pH of the prepared medium under sterile conditions using sterile acid/base, ensuring adjustments do not introduce inhibitory ions or osmotic stress. • For applications requiring defined ionic strength or alternative buffering capacity, use a validated, assay‑compatible buffer system in conjunction with the organism and calibration curve. Validate any modifications to maintain method accuracy and precision.

Green Alternatives

Environmental/green chemistry perspective (general for microbiological vitamin assays): • Strengths of microbiological biotin assays:

• Aqueous systems with minimal or no organic solvents.
• Operate at moderate temperatures (typ. 30–37°C), reducing energy demand relative to high‑temperature analytical methods.
• Low instrumentation footprint (spectrophotometer/plate reader) compared with LC‑MS. • Potential tradeoffs:
• Incubation times (hours) and biological variability can reduce throughput.
• Autoclaving/sterilization consumes steam/energy. • Alternatives and tradeoffs (literature):
• HPLC/LC‑MS biotin quantitation: Higher specificity and faster turnaround; however, requires organic solvents (acetonitrile/methanol), generates solvent waste, and uses more energy‑intensive instrumentation.
• Immunoassay/biotin‑binding protein methods: Potential for rapid screening with moderate solvent use but may require single‑use plastics and specialized reagents. • Greener practice tips with this medium:
• Prepare only the volume needed; avoid discarding large volumes of unused sterile medium.
• Use energy‑efficient autoclave cycles validated for sterility assurance.
• Employ reusable glassware where appropriate and validated cleaning/sterilization is feasible.
• Consolidate assays into microplate formats to reduce medium and waste per test. • Summary: For many labs, a microbiological biotin assay medium offers a comparatively low‑impact, water‑based route to biotin quantitation while maintaining analytical relevance for complex matrices.

Pharmaceutical Uses

No therapeutic/clinical applications are claimed. Research and quality‑control contexts only. Typical roles in pharmaceutical/biotech laboratories (literature/general): • Raw material testing and QC: Microbiological determination of biotin content in vitamin ingredients, finished dosage forms, and nutritional supplements where compendial or in‑house microbiological methods are established. • Process development and monitoring: Assessing biotin levels in fermentation or cell culture feeds/hydrolysates, particularly where biotin is a critical nutrient. • Method validation/verification: As a matrix for establishing linearity, accuracy, precision, limit of detection/quantitation for microbiological biotin assays (e.g., AOAC/USP style methods), using certified biotin standards. • Training and proficiency: Standardized medium supports analyst training for growth‑based assays in QA/QC labs. Compliance notes: • If your workflow references pharmacopeial methods (e.g., USP general chapters on microbiological assays of vitamins), confirm that the medium meets method suitability criteria via system suitability tests with your selected organism. Item-specific pharmacopeial status: Not specified for this item; refer to CoA/Spec Sheet. • Documentation: Maintain batch records for medium lot numbers, preparation logs, sterilization parameters, and standard curves with acceptance criteria.

Physical Properties

Item-specific specifications are not provided. For authoritative values, refer to the product CoA/SDS. • Appearance: Not specified for this item; refer to CoA/Spec Sheet. (General: microbiological media are supplied as dry, free‑flowing powders or granules; literature.) • Solubility: Designed to be water‑soluble/dispensable for preparation of an aqueous culture medium; exact g/L preparation rate: Not specified for this item; refer to product label/Spec Sheet (literature/general practice). • pH (prepared medium): Not specified for this item; refer to CoA/Spec Sheet. (Many vitamin assay media target near‑neutral pH after sterilization, literature.) • Density/bulk density (powder), refractive index, logP, pKa, melting/boiling point: Not applicable or not meaningful for a complex dehydrated medium; not specified for this item; refer to CoA/Spec Sheet. • Hygroscopicity: Many dehydrated media are moderately hygroscopic; keep container tightly closed to avoid clumping and moisture uptake (general guidance). • Compatibility: Intended for dissolution in purified/distilled or deionized water suitable for microbiology. Avoid hard/ion‑rich water that can precipitate phosphates or other salts (general guidance).

Quality & Grades

• Grade: BioReagent (item-specific). This designation indicates the product is suitable for life‑science research applications where consistent biological performance and low levels of inhibitory contaminants are important. While not necessarily conforming to pharmacopeial monographs, BioReagent grade emphasizes reproducibility and functional performance. • What this means in practice:

• Each lot is formulated from components intended for biological work and undergoes quality checks appropriate for culture media (e.g., appearance, solubility, pH of prepared medium, and functional growth/response with suitable test organisms; general for assay media). Lot-specific tests for this item: Not specified; refer to CoA/Spec Sheet.
• Lower bioburden compared to commodity‑grade materials; not sterile as supplied unless expressly stated (not specified here). • Stabilizers/antimicrobials: Not specified for this item; refer to CoA/Spec Sheet. • UV/fluorescence background for analytical detection: Not specified for this item; microbiological assays typically rely on turbidity/OD rather than UV background. • Documentation: For regulated labs, retain the CoA and SDS for the specific lot. If your method references a compendial medium (e.g., AOAC/ISO/USP microbiological vitamin assay methods), verify suitability/fitness for use through method validation/verification.

Reaction & Applications

This product is not a chemical reagent for synthetic reactions; it is a biological culture medium designed for biotin quantitation by microbiological assay. Key laboratory applications (literature/general): • Microbiological (turbidimetric or endpoint) biotin assay:

• Principle: Growth of a biotin‑dependent test organism (e.g., Lactobacillus spp.) is proportional to biotin concentration in the sample within a defined dynamic range. Turbidity (OD at 540–650 nm, instrument‑dependent) or fluorescence/metabolic indicators may be used as readouts.
• Use cases: Quantifying biotin in foods, feeds, cell culture hydrolysates, fermentation broths, vitamin premixes, and verifying fortification levels. Also for method development/validation and analyst training. • Sample preparation: Many matrices require enzymatic or acid hydrolysis and neutralization to release protein‑bound biotin (literature). Clarification/filtration helps prevent turbidity artifacts. • Controls and standards: A biotin reference standard curve (serial dilutions) is essential to convert growth to concentration. Include medium blanks and matrix spikes for recovery assessment. • Practical tips:
• Maintain aseptic technique to avoid contamination that could mask growth response.
• Use freshly prepared media and standardized inoculum density to minimize variability.
• Incubation temperature, time, and organism strain should match your validated method (e.g., AOAC/ISO/USP guidance). Exact conditions for this item: Not specified; refer to your method/CoA.

Reaction Conditions

Not applicable to chemical reactions. For biological assay use (literature/general guidance): • Test organism: A biotin‑auxotrophic strain (e.g., selected Lactobacillus spp.) standardized per your method. Specific organism for this item: Not specified; refer to method/CoA. • Incubation: Typically aerobic incubation at organism‑appropriate temperature (often 30–37°C) until measurable turbidity is achieved within the validated time window. Exact temperature/time: Not specified; refer to method/CoA. • Readout: Turbidimetric OD measurement in tubes or microplates; ensure measurements fall within the linear response region of the calibration curve. Wavelength and pathlength: instrument‑dependent (literature). • Sterility: Medium preparation and inoculation should be aseptic. Autoclave/filtration conditions for this item: Not specified; follow laboratory SOPs and method requirements.

Safety & Handling

GHS/SDS attributes for this specific item are not provided here. Always consult the SDS for authoritative information. • GHS classification, signal word, H‑statements, pictograms: Not specified for this item; refer to SDS. • General hazards (literature/general): Dehydrated culture media are typically of low acute toxicity but can cause respiratory or skin irritation as dusts. Some components may be nuisance dusts; rare sensitization is possible. • PPE: Laboratory coat, safety glasses, and suitable gloves. Use a dust mask or particulate respirator if handling large quantities or if dust generation cannot be controlled. • Handling: Avoid creating dust. Work in a clean area to prevent microbial contamination. For bioassays, maintain aseptic technique to avoid false results. • Incompatibilities: Strong oxidizers and acids/bases may degrade nutrients. Moisture exposure can cause clumping and reduced performance. • First aid (overview; consult SDS): If inhaled—move to fresh air. Skin contact—wash with soap and water. Eye contact—rinse cautiously with water for several minutes, remove contact lenses if present. If ingested—rinse mouth; seek medical advice if unwell. • Fire safety: Most dehydrated media are organic mixtures that can burn; use water spray, CO2, dry chemical, or foam. Combustion may produce COx/NOx (general). • Waste: Dispose of unused powder and used culture media as laboratory waste according to institutional and local regulations. Sterilize biological waste before disposal.

Solvent Selection

This product is a dehydrated culture medium intended for aqueous preparation; organic solvent selection is not applicable. • Primary solvent: Water (sterile, deionized/distilled). Use water meeting microbiological assay requirements (e.g., low endotoxin/bioburden as required by your method; literature guidance). • Practical guidance:

• Dissolve the indicated grams per liter as specified on the product label (item-specific value not provided here).
• Mix thoroughly to avoid clumps; gentle warming may aid dissolution. Avoid overheating to prevent nutrient degradation.
• Sterilize by autoclaving or sterile filtration as appropriate to your method and any heat‑labile components (general microbiology practice). Autoclave conditions and any post‑sterilization supplements: Not specified for this item; refer to method/CoA. • When to choose this medium vs alternatives:
• Choose a biotin assay medium when performing growth‑response quantification of biotin, typically with a biotin‑auxotrophic microorganism.
• Alternative quantification strategies include HPLC/LC‑MS of biotin or microbiological tablets/ready‑to‑use broths; tradeoffs include specificity, sample cleanup, and equipment requirements (literature).

Storage & Reconstitution

• Storage (as supplied): Room temperature (item-specific). Keep tightly closed in a dry place. Protect from moisture and microbial contamination. • Shipping: Normal (ambient) shipping conditions (item-specific). • Shelf life/expiry: Not specified for this item; refer to product label/CoA. • Reconstitution/preparation:

• Dissolution medium: Sterile, deionized/distilled water.
• Use the grams per liter indicated on the product label; exact value not specified for this item. Mix thoroughly to achieve full dissolution.
• Sterilization: Autoclave or sterile‑filter as required by your method. Autoclave parameters and any heat‑labile supplements: Not specified for this item; refer to SOP.
• After sterilization, cool to handling temperature before inoculation. If required, aseptically add supplements/standards. • Prepared medium storage: If not used immediately, store prepared sterile medium under conditions validated by your lab (e.g., 2–8°C, protected from light) and use within a defined hold time to maintain performance. Exact hold time: Not specified for this item; refer to SOP. • Freeze–thaw: Avoid freezing prepared medium unless validated; repeated freeze–thaw can precipitate components and impair performance. • For research use only (item-specific).

Structure & Identity

• Item type: Biotin Assay Medium is a defined/semidefined microbiological culture medium blend formulated for quantitative determination of biotin by growth-response assay. It is a multi‑component mixture, not a single chemical entity. • CAS, SMILES, InChIKey: Not applicable for a complex medium; not specified for this item; refer to CoA/Spec Sheet. • Molecular formula and molecular weight: Not applicable to mixtures; not specified for this item; refer to CoA/Spec Sheet. • Structural features (descriptive): As a culture medium, it typically contains carbon/nitrogen sources, salts, buffering components, and growth factors with biotin omitted/limiting to enable bioassay. Exact composition and any growth supplements are product‑specific and not disclosed here. • 2D structure in words: Not applicable (mixture). If needed, consult the product’s Certificate of Analysis for a component list or qualitative description. • Identity verification: In practice, identity is verified functionally (support of organism growth in response to added biotin standard) and by QC attributes such as pH of prepared medium, appearance, and sterility. Item-specific identity tests: Not specified for this item; refer to CoA/Spec Sheet. • Synonyms/Use context: “Microbiological assay medium for biotin,” “Vitamin H assay medium,” typically paired with biotin‑auxotrophic test organisms (e.g., Lactobacillus spp.) for turbidimetric or endpoint assays (literature).

Synthetic Utility

Not applicable. Biotin Assay Medium is a biological culture medium and is not used as a reagent or building block in chemical synthesis. For chemical transformations or retrosynthetic planning, refer to pure chemical reagents rather than complex nutrient media.

Target Specificity

Not an antibody or affinity reagent; no molecular target, epitope, clone, or species reactivity applies. • Analytical specificity context: In microbiological biotin assays, apparent specificity arises from the biotin requirement of the chosen test organism. Specificity and potential interferences depend on organism strain and medium composition (literature). For item‑specific organism compatibility and selectivity: Not specified; refer to CoA/Spec Sheet and your validated method.

Frequently Asked Questions

How should this product be stored?

Store at room temperature.