TTC Nutrient Agar - BioReagent

Cat. No.: T1528315

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Overview

For total bacterial count determination

Specifications

Specifications & Purity

BioReagent

Storage

Room temperature

Shipped In

Normal

Grade

BioReagent

Product Line

Biological Products

Application Protocols

The following is general, literature‑based guidance for TTC‑supplemented nutrient agar. Always follow the instructions on the product label/CoA for this specific item.

Typical plate preparation (literature/general)

1. Calculate medium: Use the grams per liter specified on the label for the dehydrated medium. If TTC is supplied separately, prepare a sterile stock (e.g., 1% w/v) and add to achieve a final concentration in the range 0.01–0.1 g/L, depending on organism sensitivity.
2. Suspend and dissolve: Add dehydrated medium to purified water; heat with stirring to boiling to dissolve agar.
3. Sterilize: Autoclave at 121 °C for 15 minutes. If adding TTC post‑autoclave, cool to ~50 °C, then aseptically add the TTC stock and mix gently.
4. Pour plates: Dispense 20–25 mL per 90‑mm plate; allow to solidify. Store plates inverted at 2–8 °C in sealed bags/containers if not used immediately; warm to room temperature before use.
5. Inoculate and incubate: Streak or spread sample; incubate in the appropriate atmosphere and temperature. Monitor for red formazan colony development.

Controls and QC

• Include a medium‑only sterility control plate per batch.
• Run a positive control organism known to reduce TTC (e.g., E. coli) and, if relevant, a TTC‑sensitive strain to verify non‑inhibitory conditions.

Biological Roles

Although this is not a biomolecule with intrinsic physiological function, the medium participates in microbiological processes as a support matrix and redox reporter (literature/general):

• Nutritional support: Peptones and extracts provide amino acids, peptides, vitamins, and minerals supporting the growth of a broad range of non‑fastidious bacteria.
• Osmotic balance: NaCl maintains osmotic conditions conducive to common laboratory organisms.
• Matrix: Agar provides a solid surface for clonal colony formation and morphological evaluation.
• Redox reporting: TTC serves as an artificial electron acceptor; viable, respiring cells reduce TTC to red formazan, linking colony coloration to metabolic activity of the electron transport chain.

Considerations

• Some microorganisms are inhibited by tetrazolium salts or reduce them poorly; interpret negative coloration cautiously and consider control plates without TTC.
• Oxygen availability affects TTC reduction; colonies at higher aeration often appear more intensely red.

Use context

• Suitable for studies of metabolic activity, plating efficiency, contamination checks, and comparative phenotyping in research laboratories. No medical or clinical diagnostic claims are made for this product.

Buffer Applications

This product is a complete culture medium, not a defined buffering system. Therefore, conventional buffer formulation guidance (molarity, pKa windows) is not applicable.

Relevant notes (literature/general)

• Intrinsic buffering: Nutrient media possess weak buffering capacity from peptides and phosphate traces in extracts; typical final pH for nutrient agar formulations is around 6.8–7.4 after sterilization.
• pH adjustments: If method requires, adjust the hydrated medium pH before sterilization using dilute NaOH/HCl; avoid over‑adjustment as it can alter gel strength and TTC performance.
• Applications: For electrophoresis or cell‑free biochemical assays, use dedicated buffers (e.g., Tris, phosphate). For microbial plating, rely on the native medium pH unless protocol‑specified.

Green Alternatives

Greenness considerations for TTC Nutrient Agar focus on the indicator and sterilization energy use.

• Indicator choice: TTC (a tetrazolium salt) provides sharp visual contrast but can be toxic to some microbes and presents aquatic toxicity concerns in waste. Alternatives include:
  • Resazurin/rezorufin systems (literature): redox indicators with high sensitivity; can be added at low concentrations but may impart fluorescence rather than red precipitate.
  • Triphenyl tetrazolium formazan (TTF) endpoint staining rather than in‑plate TTC can reduce total indicator use.
• Energy/consumables: Autoclaving is energy intensive and uses disposable plastics for plates.

Comparison (literature/general; not item‑specific)

• Criterion | TTC Nutrient Agar | Alternative indicator media
• Visual contrast | Strong red precipitate in colonies | Colorimetric/fluorescent (resazurin), sometimes subtler on opaque matrices
• Microbial impact | Higher TTC may inhibit sensitive strains | Often milder at low doses
• Waste impact | Tetrazolium salts require mindful disposal | Some alternatives have improved ecotoxicity profiles

Practical steps

• Use minimal effective TTC concentration validated for target organisms.
• Consolidate autoclave loads and use reusable glassware where possible.
• Treat liquid wastes containing TTC with institutional hazardous waste procedures.

Pharmaceutical Uses

No therapeutic or clinical uses are implied. In pharmaceutical and biomanufacturing laboratories, TTC Nutrient Agar can serve in non‑clinical, research or QC contexts (literature/general):

• Environmental monitoring and general bioburden checks where enhanced colony contrast is beneficial.
• Method development for plating efficiency, recovery studies, or visual differentiation of colonies during upstream process development.
• Training and proficiency testing materials for microbial techniques (research/industrial labs only).

Standards alignment (general)

• Compendial chapters (e.g., USP/EP/JP) reference nutrient agar for certain general tests; TTC supplementation is a laboratory adaptation for contrast and is typically outside strict compendial formulations unless specifically validated. Validate any TTC‑supplemented method before use in regulated testing.

Physical Properties

Item-specific specifications are not provided in the Product Data.

• Appearance (as supplied): Not specified for this item; refer to CoA/Spec Sheet.
• Moisture content, ash, gel strength, pH (dehydrated): Not specified for this item; refer to CoA/Spec Sheet.
• Storage temperature: Room temperature (per Product Data)
• Shipping: Normal (per Product Data)

Typical properties of TTC nutrient agar media (literature/general; not item specifications)

• Typical working concentration of dehydrated medium in water: ~23–28 g/L for nutrient agar base; TTC often at 0.01–0.1 g/L depending on application and organism sensitivity.
• Final medium pH at 25 °C: commonly around 6.8–7.4 after sterilization (varies with formulation).
• Gelation: solidifies on cooling (~35–40 °C) due to agar; melts ≈ 85–95 °C and remains liquid above ~45–50 °C when poured.
• Solubility: Intended to disperse in water; requires heating to dissolve agar fully. Insoluble in organic solvents as a whole formulation; TTC itself is water‑soluble.

Important

• Values above are general for TTC‑supplemented nutrient agar and may differ from this item; consult the product label/CoA for exact preparation mass per liter and target pH.

Quality & Grades

• Grade: BioReagent (per Product Data)
  • Meaning (general): Suitable for biological/biochemical research workflows where consistent performance and low bioburden are critical. BioReagent‑grade media components typically undergo QC for identity, performance (growth promotion), and microbial limits. (literature/general)

Quality considerations for TTC Nutrient Agar (literature/general)

• Growth Promotion Test (GPT): Lots are typically evaluated by growth of representative organisms (e.g., E. coli, S. aureus) and the ability of TTC to yield characteristic red formazan colonies. Expectation is robust recovery and clear colony contrast.
• Indicator performance: TTC concentration and purity influence colony coloration intensity and background tint; BioReagent grade aims to balance sensitivity with low background.
• Sterility assurance: Dehydrated medium is non‑sterile and requires autoclaving. Low bioburden starting material assists in achieving reliable sterility post‑processing.
• Trace components: Exact peptone/agar sources and ionic content can influence colony morphology and TTC reduction rate. For regulated work, maintain lot‑to‑lot continuity.

Item‑specific notes

• Exact formulation, TTC level, gel strength, and target pH: Not specified for this item; refer to CoA/Spec Sheet and product label for grams per liter and sterilization guidance.
• Stabilizers or additives: Not specified for this item; refer to CoA/Spec Sheet.

Reaction & Applications

As a microbiological medium, TTC Nutrient Agar is used for cultivation and differentiation rather than chemical synthesis. Key laboratory applications (literature/general):

• Differential plating: TTC serves as a redox indicator; metabolically active colonies reduce TTC to insoluble red formazan, enhancing visibility and allowing discrimination of respiration‑competent cells.
• Enumeration and quality control: Used in environmental, food, and industrial microbiology to enumerate total aerobic bacteria with improved colony contrast on opaque or particle‑laden samples.
• Colony morphology studies: TTC can influence/contrast colony centers vs periphery, aiding phenotypic comparisons and mutation screening.
• Viability assessment: Reduction of TTC correlates with electron transport activity; useful in assessing viability on plates and for overlay assays.
• Motility and TTC overlays: In semi‑solid formats (reduced agar), TTC can be used in motility tests, where red diffusion indicates movement from the stab line.

Practical tips

• Optimize TTC concentration: Excess TTC may inhibit some organisms; typical working ranges are 0.01–0.1 g/L (literature), with sensitive species requiring less.
• Incubation: Standard aerobic incubation conditions for the test organism; avoid strong light during incubation to limit indicator degradation.
• Interpretation: Pale pink to deep red colonies indicate reduction; some anaerobes or slow growers may remain colorless unless adapted methods are used.

Reaction Conditions

Classical reaction‑chemistry conditions are not applicable. For medium preparation and use (literature/general):

• Reconstitution: Suspend the label‑specified mass of dehydrated medium per liter of purified water. Heat with stirring until boiling to dissolve agar completely.
• Sterilization: Autoclave at 121 °C for 15 minutes (typical). Alternatively, autoclave the base medium and aseptically add filter‑sterilized TTC to working temperature (~50 °C) if your SOP calls for post‑sterilization addition to minimize thermal reduction.
• Pouring: Cool to 45–50 °C, then pour 20–25 mL per standard Petri dish. Allow plates to solidify on a level surface; dry if necessary to remove surface moisture.
• Incubation: Invert plates and incubate at organism‑appropriate temperature and atmosphere. Protect from strong light to preserve indicator performance.

Note: Exact grams per liter, pH targets, and TTC concentration are Not specified for this item; refer to CoA/Spec Sheet and product label.

Safety & Handling

Hazard information in Product Data is not specified; consult the SDS for authoritative guidance.

General safety considerations (literature/general)

• GHS/Signal word: Not specified for this item; refer to SDS. Note: TTC is a tetrazolium salt that may cause irritation; handle powders to minimize dust inhalation.
• PPE: Laboratory coat, safety glasses, and appropriate gloves (e.g., nitrile). Use a dust mask/respirator if dust generation is possible. Work in a clean area to prevent contamination.
• Microbiological risk: While the medium itself is not infectious, it is used to cultivate microorganisms. Apply BSL‑appropriate practices. Decontaminate all cultures, plates, and spills (e.g., 10% bleach with sufficient contact time) and autoclave waste before disposal.
• Thermal handling: Preparation requires boiling and/or autoclaving at 121 °C. Use heat‑resistant gloves and caution when pouring plates at ~45–50 °C.
• Incompatibilities: Avoid mixing with strong oxidizers or acids/bases that could degrade organic components or TTC. Protect TTC‑containing media from intense light to limit indicator degradation.
• First aid (overview):
  • Inhalation of dust: Move to fresh air; seek medical attention if irritation persists.
  • Skin/eye contact: Rinse with water; remove contaminated clothing; obtain medical advice if irritation continues.
  • Ingestion: Rinse mouth; do not induce vomiting; seek medical advice.

Always defer to the product’s SDS and your institution’s biosafety program.

Solvent Selection

This product is a dehydrated culture medium designed to be reconstituted in water; organic solvent selection is not applicable.

Practical guidance (literature/general)

• Water quality: Use purified/distilled water (Type II or better). High ionic strength or organic carbon in tap water can affect gel strength and TTC background.
• Dissolution: Suspend the specified mass per liter in cold water first; heat with stirring to boiling to fully dissolve agar before sterilization.
• Sterilization: Autoclave at 121 °C for 15 minutes (typical). Some workflows add TTC after sterilization by filter sterilization to minimize thermal reduction; follow your SOP.

Comparison (general)

• Water vs buffers: While water is standard, minor buffering (from peptones/extracts) is intrinsic to the medium. External buffers are typically unnecessary and can alter growth; avoid unless method‑validated.

Storage & Reconstitution

• Storage conditions (as supplied): Room temperature (per Product Data). Keep container tightly closed and protected from moisture and excessive light.
• Shipping: Normal (per Product Data).
• Shelf life: Not specified for this item; refer to CoA/Spec Sheet.

Reconstitution and sterilization (literature/general)

• Reconstitution solvent: Purified/distilled water.
• Mass per liter: Not specified for this item; follow the label. Typical nutrient agar bases are ~23–28 g/L; TTC is commonly 0.01–0.1 g/L depending on application.
• Dissolution: Suspend in water; heat to boiling with stirring until agar fully dissolves.
• Sterilization: Autoclave at 121 °C for 15 minutes. Optionally add TTC aseptically after sterilization to working temperature (~50 °C) if your SOP recommends it.
• Plate storage: After pouring and solidification, store plates inverted in sealed sleeves at 2–8 °C, protected from light. Use within 2–4 weeks for best performance (general guidance); allow to equilibrate to room temperature and surface‑dry before inoculation.

Handling notes

• Avoid repeated heating/cooling cycles of molten medium; this can degrade nutrients and indicator.
• Prevent condensation by drying plates briefly at 35–37 °C with lids ajar before storage.
• Research use only (per Product Data).

Structure & Identity

TTC Nutrient Agar is a dehydrated, multi‑component microbiological culture medium incorporating a redox indicator. It is a formulated mixture rather than a single chemical substance; therefore, single‑molecule identifiers do not apply.

• Item nature: Complex mixture (nutrient agar base + 2,3,5‑triphenyl tetrazolium chloride, “TTC”, indicator) (literature/general)
• Molecular formula: Not applicable to a mixture; individual components have their own formulae (e.g., TTC: C19H13ClN4) (literature/general)
• Molecular weight: Not applicable to the mixture; see component CoAs if required
• SMILES / InChI / InChIKey: Not applicable to a formulated medium
• Structural features (2D description):
  • Nutrient agar base comprises peptones and beef/yeast extract (complex, undefined composition), NaCl (ionic), and agar (polysaccharide gelling agent). (literature/general)
  • TTC is an aromatic tetrazolium salt that is reduced by metabolically active cells to insoluble red formazan, aiding colony visualization and differentiation. (literature/general)

Notes on identity

• Because composition can vary by supplier/lot, definitive identifiers (exact percentages, exact peptone source) are mixture‑specific. Refer to the product label or CoA for lot‑specific composition.
• Intended use: preparation of solid plates to grow and differentiate aerobic/ facultative bacteria by TTC reduction (research use only).

Synthetic Utility

Not a chemical building block or reagent for synthetic chemistry. Consequently, typical discussions of functional‑group transformations, protecting groups, and cross‑couplings do not apply.

Relevant laboratory utility (literature/general)

• Provides a solid phase for microbial growth, screening, and selection that can precede biocatalysis campaigns or strain engineering workflows.
• TTC reduction serves as a rapid visual readout of respiratory activity for colony picking or phenotypic screening.

Target Specificity

Not applicable. This product is not an antibody, probe, or affinity reagent and has no antigen/epitope specificity. It is a general‑purpose culture medium with an indicator.

Frequently Asked Questions

How should this product be stored?

Store at room temperature.