Modified Thayer-Martin Selective Agar Base - BioReagent

Cat. No.: M1528582

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Overview

For isolation of pathogenic Neisseria

Specifications

Specifications & Purity

BioReagent

Storage

Room temperature

Shipped In

Normal

Grade

BioReagent

Product Line

biological_products

Application Protocols

General, literature-based protocol for preparing Modified Thayer-Martin selective plates from an agar base (verify and adapt per manufacturer instructions and lab SOP; not item-specific specs):

1. Reconstitution and sterilization

• Weigh the prescribed mass of dehydrated agar base per liter of purified water (mass-per-liter Not specified here; refer to CoA/Spec Sheet). Suspend with stirring and heat to dissolve completely.
• Adjust volume as needed. Dispense if desired. Autoclave under validated conditions for microbiological media.

2. Cooling and supplementation

• Cool the sterile base to 45–50 °C. Aseptically add:
  • Growth enrichment (e.g., IsoVitaleX/Vitox) per supplier guidance.
  • Selective antibiotic supplement for Modified Thayer-Martin (e.g., vancomycin, colistin/polymyxin B, nystatin or amphotericin B, and trimethoprim) at validated concentrations.
• Mix gently to avoid bubbles.

3. Plating and drying

• Pour into sterile Petri dishes. Allow to solidify. Dry surfaces (e.g., at room temperature in a laminar-flow hood) to remove excess surface moisture.

4. Inoculation and incubation

• Streak specimens. Incubate at 35–37 °C in 5–10% CO2, humidified. Examine at 24 and 48 hours.

5. QC checkpoints

• Perform growth-promotion with Neisseria control strains and inhibition tests with representative contaminants. Verify pH and sterility of uninoculated plates.

Dispose of used plates as biohazardous, antibiotic-containing waste.

Biological Roles

This product does not have a single biological role as a molecule; rather, it provides a controlled microenvironment for selective growth of fastidious bacteria (research use only).

• Nutritional support (literature/general):
  • Peptones/enzymatic digests supply amino acids, peptides, and growth factors.
  • Phosphate buffering helps maintain near-neutral pH during incubation.
  • Agar yields a solid surface for colony isolation and morphology assessment.
  • Starch or similar adsorbents (when present) can neutralize inhibitory metabolites or toxic fatty acids that impair Neisseria recovery.
• Selective pressure (literature):
  • Antibiotic supplements (added separately) suppress background flora while permitting growth of target Neisseria spp., improving recovery from mixed specimens.
• Enrichment (literature):
  • Addition of lysed blood (chocolateing) provides hemin (X factor), NAD (V factor), and other cofactors required by fastidious organisms.
• Incubation environment (literature):
  • Elevated CO2 (≈5–10%) and humidity mimic mucosal niches and support metabolic requirements of Neisseria.

Note: The above describes typical biological functions of Modified Thayer-Martin-type media; it does not constitute item-specific specifications. For exact formulation and performance claims, consult the CoA/Spec Sheet and perform in-lab verification with control strains.

Buffer Applications

Not a dedicated buffer system. Although the prepared medium typically contains buffering salts (e.g., phosphate, literature) to stabilize pH near neutrality for microbial growth, this product is not intended for analytical buffering or titration applications. For pH-critical biochemical assays, use dedicated buffer systems (e.g., phosphate, HEPES, MOPS) prepared to defined concentrations and ionic strengths.

Green Alternatives

While culture media are inherently water-based and solvent-minimal, sustainability considerations still apply to preparation and use.

• Current practice (general):
  • Dehydrated medium shipped at ambient temperatures minimizes cold-chain energy.
  • Reconstitution uses water as solvent; no organic solvents are required.
• Opportunities and trade-offs (literature/general):
  • Autoclaving is energy-intensive; consider batch preparation and efficient autoclave loading to reduce cycles and energy per liter.
  • Prepare only the volume needed to limit waste of antibiotic-containing plates, which require specialized disposal.
  • Where appropriate, use LED lighting and timed incubators/CO2 controllers to reduce power consumption.
• Alternatives/comparisons (literature):
  • Nonselective chocolate agar (without antibiotics) reduces antibiotic waste but sacrifices selectivity, possibly requiring more subcultures and incubations (more consumables/energy).
  • Other selective systems (e.g., Martin-Lewis, New York City agar) vary in antibiotic panels and base matrices. Selection should balance performance with waste profile and local regulatory constraints on antibiotic disposal.

Summary: The product aligns with greener lab practices through aqueous preparation and ambient shipping. Primary environmental impacts arise from sterilization energy and disposal of antibiotic-containing materials; optimize batch sizing and sterilization logistics to mitigate.

Pharmaceutical Uses

This product is intended for laboratory research use only. It is not an excipient and is not intended for manufacturing or formulation of pharmaceutical products.

• Related contexts (general/microbiology QA):
  • In pharmaceutical microbiology labs, selective media may be used in research method development or environmental study of fastidious organisms. Such uses require independent qualification and are outside the scope of this catalog listing.
• Pharmacopeial status: Not specified for this item; refer to CoA/Spec Sheet if any compendial references are provided.

No clinical or diagnostic use is claimed or implied.

Physical Properties

Item-specific physicochemical specifications are not provided for this dehydrated medium.

• Appearance (dehydrated): Not specified for this item; refer to CoA/Spec Sheet.
• Solubility: Designed to be soluble in purified/deionized water during medium preparation (general property of dehydrated media; literature). Complete dissolution typically requires heating and stirring.
• pH (after preparation): Selective Neisseria media are typically adjusted to near-neutral pH (about 7.2–7.4 at 25 °C, literature). Actual pH for this item is Not specified; refer to CoA/Spec Sheet and follow in-lab QC.
• Density, melting/boiling point, refractive index, logP: Not applicable/Not specified for this complex mixture; refer to CoA/Spec Sheet.
• Physical behavior (literature):
  • On autoclaving and proper cooling, the agar base forms a firm gel suitable for streaking and antibiotic diffusion.
  • Gel strength and clarity depend on agar grade and total solids; selective supplements and chocolateing (lysed blood) will darken and opacify the medium.
• Practical notes (literature, non-spec):
  • Dissolve the base in water with continuous mixing before sterilization. Avoid scorching.
  • Final medium performance (selectivity and recovery) depends on proper supplement addition (e.g., hemoglobin/chocolate, growth supplement such as IsoVitaleX/Vitox, and selective antibiotics) at 45–50 °C before pouring plates.

Quality and Grades

• Grade: BioReagent (as provided in Product Data). In general, BioReagent-grade materials are suitable for demanding laboratory workflows in the life sciences and microbiology, with attention to lot-to-lot consistency and performance. Note: Specific acceptance criteria for this item are Not specified; refer to CoA/Spec Sheet.
• Performance attributes (general for selective Neisseria media, literature):
  • Supports growth of fastidious Neisseria spp. when enriched (e.g., chocolate base with hemoglobin and supplements) while inhibiting common contaminants via selective antibiotics added post-sterilization.
  • Clarity/gel strength appropriate for streak isolation and colony morphology assessment.
• Stabilizers/preservatives: Not specified for this item; refer to CoA/Spec Sheet.
• Typical QC tests (laboratory practice, not item-specific specs):
  • pH of prepared medium at 25 °C.
  • Growth promotion: robust recovery of N. gonorrhoeae/N. meningitidis reference strains with characteristic colony morphology and acceptable colony counts.
  • Inhibition: suppression of representative background flora (e.g., Gram-positives, many Gram-negatives, yeasts) when selective antibiotics are included.
• Documentation: For exact composition ranges, recommended preparation weight per liter, and selective supplement catalog numbers, consult the item’s CoA/Spec Sheet and SDS.

Reaction and Applications

Chemical reaction applications are not applicable. Instead, this agar base is used for microbiological culture workflows (research use only).

• Core application (literature): Selective isolation and cultivation of fastidious Neisseria spp. (e.g., N. gonorrhoeae, N. meningitidis) from mixed microbiota. Selectivity is achieved by incorporating antibiotic supplements into the sterilized base before plating.
• Rationale of selectivity (literature):
  • Vancomycin inhibits Gram-positive flora.
  • Colistin (polymyxin B) targets many Gram-negative rods.
  • Nystatin or amphotericin B suppresses yeasts/fungi.
  • Trimethoprim reduces swarming/proteus overgrowth and folate-pathway escapees.
• Workflow highlights (literature):
  • Prepare and sterilize the base, cool to 45–50 °C, then aseptically add heat-labile growth supplement (e.g., IsoVitaleX/Vitox) and selective antibiotic supplement at validated concentrations.
  • Pour plates under aseptic conditions. Dry surfaces before inoculation to reduce spreading.
  • Incubate inoculated plates in a CO2-enriched (≈5–10%), humidified atmosphere at 35–37 °C. Examine at 24 and 48 hours.
• Quality considerations:
  • Use fresh supplements and avoid light/heat degradation of antibiotics.
  • Include appropriate positive-control strains and inhibition controls in each lot verification.

Note: Follow institutional biosafety and quality procedures. No clinical/diagnostic claims are made.

Reaction Conditions

Chemical reaction conditions are not applicable. For microbiological culture conditions (literature, general guidance; verify per SOP):

• Medium preparation:
  • Dissolve the dehydrated base in purified water with stirring and heat until fully solubilized. Adjust volume and mix thoroughly. Autoclave according to institutional sterilization parameters for culture media.
  • Cool to ~45–50 °C in a water bath. Aseptically add heat-labile enrichment (e.g., IsoVitaleX/Vitox) and the Modified Thayer-Martin selective antibiotic supplement at validated concentrations. Mix gently to avoid bubbles, then pour plates.
• Incubation:
  • Inoculate plates and incubate at 35–37 °C in a 5–10% CO2, humidified atmosphere. Inspect at 24 and 48 hours; some isolates may require up to 72 hours.
• Expected outcomes (literature):
  • Growth of Neisseria spp. with characteristic small, grayish, translucent colonies; inhibition of many competing Gram-positive bacteria, Gram-negative rods, and yeasts due to the selective agents.

Note: The above are general literature conditions for Modified Thayer-Martin-type media and are not item-specific specifications. Follow your laboratory’s validated methods and refer to the CoA/Spec Sheet.

Safety and Handling

• GHS classification, pictograms, signal word, and H-statements: Not specified for this item; refer to the product SDS for authoritative safety data.
• General hazards (mixture): Dehydrated media powders may generate nuisance dust; avoid inhalation. Some selective supplements (antibiotics) are hazardous; handle according to their SDS. Once inoculated, plates must be treated as biohazardous material.
• PPE (typical lab practice): Lab coat, eye protection, and appropriate gloves. Use a dust mask or work in a fume hood/biological safety cabinet when handling powders and supplements as warranted by risk assessment.
• Handling guidance (literature):
  • Reconstitute with purified water; heat with stirring. Avoid creating aerosols. Do not ingest.
  • Sterilize by autoclaving according to institutional SOPs. Allow to cool to ~45–50 °C before adding heat-labile supplements.
• Incompatibilities (general): Strong oxidizers and acids/bases may degrade organic medium components. Store away from moisture and strong odors to preserve performance.
• First aid (overview; defer to SDS):
  • Inhalation: Move to fresh air; seek medical attention if symptoms persist.
  • Skin/eye contact: Rinse with water; remove contaminated clothing; seek medical attention for persistent irritation.
  • Ingestion: Rinse mouth; seek medical advice.
• Waste: Autoclave or disinfect used plates prior to disposal per biosafety regulations. Follow local regulations for antibiotic-containing waste.

Solvent Selection

This product is a microbiological medium base and is not used as a reaction solvent.

• Medium preparation solvent: Purified/deionized water is the appropriate solvent for reconstitution (literature). Organic solvents are not applicable.
• Polarity/miscibility: Not applicable; the dehydrated matrix is designed to dissolve/disperse in water with heating and then to gel upon cooling due to agar.
• Practical guidance (literature):
  • Use freshly prepared, high-purity water to minimize inhibitory impurities.
  • Adjust volume after dissolution and prior to sterilization to achieve target strength per manufacturer instructions (item-specific mass-per-liter Not specified here; refer to CoA/Spec Sheet).
  • Avoid high ionic strength or chelators that may interfere with growth of fastidious organisms.
• Comparison (general):
  • Nonselective bases (e.g., plain chocolate agar) use the same solvent (water) but lack antibiotic selectivity; Modified Thayer-Martin adds selectivity via antibiotic supplements to the water-based medium.

Storage and Reconstitution

• Storage conditions (as provided): Room temperature for the dehydrated agar base. Protect from moisture and excessive heat. Keep container tightly closed. Shipped under normal conditions.
• Shelf life: Not specified for this item; refer to CoA/Spec Sheet and product label.
• Reconstitution (literature; follow item-specific instructions on CoA/Spec Sheet):
  • Suspend the specified mass of dehydrated base in purified water with stirring. Heat to fully dissolve. Adjust final volume.
  • Sterilize by autoclaving using validated parameters for culture media.
  • Cool to 45–50 °C; aseptically add required enrichments (e.g., hemoglobin/chocolate base components, IsoVitaleX/Vitox) and the Modified Thayer-Martin selective antibiotic supplement. Mix and pour plates.
• Prepared media storage (literature):
  • Store solidified plates in sealed sleeves or inverted in clean containers at 2–8 °C, protected from light (especially important for antibiotic stability). Allow plates to equilibrate to room temperature and dry surface condensation before use.
  • Use within the laboratory-validated in-use dating period to ensure selectivity and growth performance.
• Freeze–thaw guidance: Do not freeze the dehydrated powder or solidified agar plates; freezing damages agar gel structure and may degrade antibiotics.

For item-specific preparation weights, supplement catalog numbers, and QC acceptance ranges, consult the product’s CoA/Spec Sheet.

Structure and Identity

This product is a complex, dehydrated culture medium blend formulated for selective cultivation of fastidious Neisseria spp. in research microbiology.

• Product type: Dehydrated selective agar base (heterogeneous mixture; not a single defined chemical entity)
• Molecular formula: Not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight: Not specified for this item; refer to CoA/Spec Sheet.
• SMILES / InChI / InChIKey: Not applicable to complex mixtures.
• Structural features (general, literature):
  • Typically contains a nutrient base (e.g., peptones/enzymatic digests), buffering salts (often phosphate-based), agar as the gelling agent, and components that reduce toxic metabolites (e.g., starch) to support fastidious organisms.
  • The “Modified Thayer-Martin” system achieves selectivity through the inclusion of antimicrobial supplements (e.g., vancomycin, colistin/polymyxin B, nystatin or amphotericin B, and trimethoprim) that are commonly added aseptically to the sterilized base before plating (literature). The “Agar Base” itself may be supplied without antibiotics; consult product-specific supplement guidance.
• Form: Free-flowing dehydrated powder intended for reconstitution in purified water and sterilization, followed by enrichment (e.g., hemoglobin/chocolate base and growth supplements) and selective antibiotics per laboratory SOP (literature).

Note: Because this is a complex medium, conventional small-molecule identifiers do not apply. Refer to the product CoA/Spec Sheet for item-specific composition and any proprietary components.

Synthetic Utility

Not applicable. This product is a microbiological medium base and is not used as a synthetic building block or reagent in chemical synthesis. For practical information relevant to this product, see the Reaction & Applications and Application Protocols sections for culture workflows.

Target Specificity

No antibody or molecular probe content is included. Target specificity in this context refers to the microbiological selectivity of the medium when supplemented (literature):

• Intended selectivity: Enhanced recovery of fastidious Neisseria species while suppressing common contaminants via a defined antibiotic panel added to the base.

Item-specific selectivity data and certified performance characteristics are Not specified for this item; refer to CoA/Spec Sheet and perform in-lab growth-promotion and inhibition testing with control strains.