Motility-Nitrate Medium (Method A) - BioReagent

Cat. No.: M1528278

QUALITÉ & PURETÉ BioReagent

Storage

Room temperature

Shipped In

Normal

Vue d’ensemble

For bacterial motility test

Spécifications

Spécifications et pureté

BioReagent

Conditions de stockage de stockage

Room temperature

Expédié en

Normal

Grade

BioReagent

Product Line

Produits biologiques

Application Protocols

The following is a general, literature-based workflow for motility–nitrate testing. Exact preparation instructions, medium mass per liter, and performance controls for this item are Not specified and must be taken from the product label/CoA and your SOPs.

• Preparation (literature):

• Suspend the indicated mass of dehydrated medium in purified water. Heat to dissolve. Dispense ~3–5 mL per culture tube to create a semi-solid column suitable for stab inoculation. Autoclave (e.g., 121°C, 15 min) and cool upright.

• Inoculation (literature):

• Using a straight inoculating needle, pick a well-isolated colony and stab once to approximately two-thirds depth in the center of the medium. Withdraw along the same track to minimize sidewall disturbance.

• Incubation (literature):

• Incubate 18–24 h (up to 48 h for slow growers) at the organism-appropriate temperature (often 30–37°C). Maintain consistent oxygen exposure per test design; nitrate reduction may be enhanced under reduced oxygen.

• Reading motility (literature):

• Motile: diffuse turbidity radiating from the stab line throughout the medium. Non-motile: growth confined to the stab line.

• Nitrate reduction test (literature):

• Add standard nitrate reagent A and B to detect nitrite; observe color development. If no color, add zinc dust to detect unreduced nitrate. Interpret per your SOP.

• Quality controls (literature):

• Include known motile and non-motile strains and known nitrate-positive and nitrate-negative strains each run.

• Disposal: Autoclave used media and cultures prior to disposal according to biosafety guidelines.

Biological Roles

This product itself has no intrinsic biological role in organisms; it is a laboratory medium formulated to support growth and physiologic activity of microorganisms for analytical purposes.

• Functional concept (literature):

• Motility assessment: A semi-solid matrix permits movement of flagellated bacteria away from the inoculation site. Non-motile organisms remain along the stab line.
• Nitrate respiration: Many bacteria can use nitrate as a terminal electron acceptor under low-oxygen or anaerobic conditions. Reduction proceeds via nitrate reductase to nitrite, and in some organisms further to nitric oxide, nitrous oxide, or nitrogen gas. The medium provides nitrate substrate; detection requires addition of standard reagents after incubation.

• Research contexts: Taxonomic differentiation of enteric and environmental isolates; studies of flagellar function, chemotaxis, and anaerobic respiratory pathways; educational demonstrations of biochemical diversity (literature).

• Limitations: Medium-based phenotypes can vary with incubation temperature, inoculum density, and oxygen availability. Definitive identification should combine multiple tests or molecular methods (literature best practice).

Buffer Applications

This product is not a defined buffer system and is not intended for pH buffering of biochemical assays. While microbiological media often contain components that provide some pH stability, specific buffering capacity and composition for this item are Not specified; refer to CoA/Spec Sheet. For dedicated buffering needs, use validated buffer reagents (e.g., phosphate, Tris) formulated for the target pH range.

Green Alternatives

Environmental and safety considerations for this product center on minimizing biological waste and energy in media preparation rather than substituting “greener solvents.”

• Waste reduction (literature):

• Prepare only the volume needed to reduce post-incubation biohazardous waste.
• Consolidate sterilization cycles to improve autoclave energy efficiency.
• Use reusable glass culture tubes where appropriate to reduce single-use plastics, balanced against contamination risk.

• Sourcing and packaging: Where available, select packaging that supports recycling or take-back programs. Maintain dry storage to maximize shelf life and reduce disposal of expired media.

• Comparison to alternatives (literature, conceptual):

• Combined motility–nitrate media can reduce the number of separate tubes/tests (one medium vs. two), lowering material and energy use per sample, at the cost of slightly more complex interpretation compared with running tests in separate specialized media.

• Chemical substitution: Not typically applicable; altering medium composition to “green” substitutes may change microbiological performance. Use validated, published formulations for comparable ecological impact with maintained test fidelity.

Pharmaceutical Uses

Not applicable. This product is a research-grade microbiological medium (BioReagent) intended for laboratory use only. It is not formulated or qualified as an excipient, nor is it intended for GMP manufacturing or clinical/diagnostic applications. For regulated workflows, use compendial media or validated, documented formulations specified by your quality system.

Physical Properties

As a formulated microbiological medium (mixture), classical single-compound physical constants do not apply.

• Appearance (dehydrated): Not specified for this item; refer to CoA/Spec Sheet.

• Appearance (prepared medium): Not specified for this item; refer to CoA/Spec Sheet.

• pH (at specified temperature): Not specified for this item; refer to CoA/Spec Sheet.

• Moisture content / granulation: Not specified for this item; refer to CoA/Spec Sheet.

• Solubility: Readily dispersible in water to prepare the working medium (general expectation for dehydrated culture media; literature). Exact dissolution behavior for this item is not specified; refer to CoA/Spec Sheet.

• Melting/boiling point, density, refractive index, logP: Not applicable or not meaningful for a complex, multiphase medium; Not specified for this item; refer to CoA/Spec Sheet.

• Typical working format (literature): Semi-solid medium (low agar concentration) enabling motility assessment by diffuse growth away from the stab line; nitrate is present as an anion source for biochemical reduction testing. Specific concentrations and gel strength are not specified for this catalog item and should be taken from the CoA/Spec Sheet/label directions.

Quality and Grades

• Grade: BioReagent. This designation indicates suitability for biological research applications, including microbiological culture and biochemical testing, with controlled bioburden and performance attributes appropriate for lab research workflows. It does not imply clinical/diagnostic use or compliance with pharmacopoeial monographs unless explicitly stated.

• Performance considerations (general for motility–nitrate media):

• Motility discrimination depends on consistent semi-solid gel strength and nutrient balance to support growth without overly restricting flagellar movement (literature).
• Nitrate reduction performance requires correctly formulated nitrate concentration and reliable response to standard nitrate/nitrite reagents post-incubation (literature).

• What is specific to this item: Storage condition and shipping mode are defined below; composition and performance specifications are Not specified for this item; refer to CoA/Spec Sheet.

• Stabilizers/indicators: Not specified for this item; refer to CoA/Spec Sheet.

• Release documentation: For lot-specific performance (e.g., pH, gel strength, growth response of control strains), consult the Certificate of Analysis/Specification Sheet.

• Suitability: For research use only (per product data). Not intended for human or animal diagnostic or therapeutic applications.

Reaction and Applications

Chemical reaction applications are not applicable to this product. It is a culture medium for microbiological testing.

• Intended laboratory application (literature):

• Determination of bacterial motility in a semi-solid medium by observation of diffused growth radiating from the inoculation stab line.
• Assessment of nitrate reduction by inoculated organisms. After incubation, standard nitrate reduction reagents are added to detect nitrite; if negative, zinc dust is used to confirm residual nitrate (literature protocol concept). Exact reagent identities and volumes are not specified for this item; consult your lab SOPs.

• Use cases: Characterization of microbial isolates, teaching laboratories, and research studies evaluating flagellar motility and anaerobic respiration pathways via nitrate as terminal electron acceptor (literature).

Reaction Conditions

Not applicable to chemical reactions. For microbiological use, general preparation and incubation conditions are provided below as literature guidance; exact instructions for this item are Not specified and should be taken from the product label or CoA.

• Medium preparation (literature): Disperse the specified mass of dehydrated medium in purified water, heat with mixing to dissolve, dispense into tubes suitable for stab cultures, and sterilize by autoclaving (e.g., 121°C for 15 minutes). Allow to solidify as a semi-solid column.

• Inoculation/incubation (literature): Stab inoculate with a straight needle; incubate aerobically or in reduced oxygen per organism requirements, commonly 18–24 h at 30–37°C depending on the test organism.

• Post-incubation nitrate test (literature): Add standard nitrate reagents to detect nitrite; if negative, add zinc dust to confirm unreduced nitrate. Record motility (diffuse turbidity away from stab) concurrently.

These are general, literature-based conditions. Follow your laboratory SOPs and the product’s CoA/Spec Sheet for item-specific parameters.

Safety and Handling

• GHS classification, signal word, pictograms, H-statements: Not specified for this item; refer to the product SDS for authoritative safety information.

• General hazards (literature/good lab practice): Dehydrated culture media can cause dust irritation to eyes/respiratory tract. Hydrated/used media present biological contamination risks after inoculation. Treat all inoculated materials as biohazardous according to your institution’s biosafety procedures.

• PPE recommendations: Wear lab coat, appropriate gloves (e.g., nitrile), and safety glasses when handling the dehydrated powder and prepared medium. Use respiratory protection if dusts/aerosols may form (per risk assessment).

• Handling: Avoid generating dust. Prepare media using aseptic technique to prevent contamination. After use with microorganisms, autoclave or chemically disinfect before disposal.

• Incompatibilities: Avoid contact of the dehydrated powder with strong oxidizers or strong acids/bases that may degrade medium components (general precaution). Do not mix with incompatible decontaminants that could release hazardous gases in presence of nitrates (e.g., strong acids forming NOx; literature caution).

• First aid (overview; consult SDS): If inhaled, move to fresh air. If on skin/eyes, rinse with water for several minutes. If ingested, rinse mouth and seek medical advice. Provide SDS to responders.

• Spills: Minimize dust; sweep up and collect for disposal. Disinfect surfaces. For biological spills (post-inoculation), apply appropriate disinfectant and contact time, then clean and autoclave waste.

• Fire: Most dehydrated media are combustible organic mixtures; use water spray, CO2, dry chemical, or foam as appropriate (literature).

Solvent Selection

This product is a dehydrated microbiological medium intended to be reconstituted with purified water. Conventional solvent-selection guidance for organic synthesis does not apply.

• Reconstitution solvent: Use high-purity water (e.g., ASTM Type I/II) to prepare the working medium (literature best practice). Exact water quality and volume per mass of medium are Not specified for this item; refer to CoA/Spec Sheet/label.

• Compatibility: Following hydration and sterilization, the semi-solid matrix is aqueous. Organic co-solvents are generally not used because they can inhibit microbial growth and alter gel strength (literature caution).

• Alternatives: If specialized motility or nitrate testing requires modified ionic strength, redox indicators, or alternate gelling agents, select a validated alternative formulation designed for microbiology rather than attempting solvent changes (literature).

Storage and Reconstitution

• Storage (as supplied): Room temperature (per product data). Keep container tightly closed in a cool, dry place. Protect from moisture and microbial contamination by minimizing time with container open.

• Shipping: Shipped under normal conditions (per product data).

• Shelf life: Not specified for this item; refer to CoA/Spec Sheet/label for expiry and recommended retest intervals.

• Reconstitution/Preparation: Exact mass-per-volume and pH targets are Not specified for this item; refer to the product label or CoA. General literature guidance for dehydrated media includes dispersing the specified mass in purified water, heating to dissolve, dispensing into tubes, and sterilizing by autoclaving (e.g., 121°C for 15 minutes). Allow tubes to set upright to obtain uniform semi-solid columns.

• Aseptic handling: Use aseptic technique during preparation and dispensing to avoid contamination. After inoculation, handle as biohazard material.

• Storage (prepared medium): If not used immediately, store tubes at 2–8°C to limit dehydration and contamination; warm to room temperature before use (literature practice). Maximum hold time before use is method- and lab-dependent; Not specified for this item—consult your SOPs.

• Freeze–thaw: Not applicable; do not freeze prepared semi-solid media unless the formulation specifically supports it (literature caution).

Structure and Identity

• Item type: Motility-Nitrate Medium (Method A) is a dehydrated microbiological culture medium intended to assess bacterial motility and nitrate reduction in a single tube assay (general description; literature). It is a formulation/mixture, not a single defined chemical substance.

• SKU: M1528278

• Mixture status: Complex mixture of nutrient and indicator components appropriate for motility testing in a semi-solid matrix and subsequent nitrate reduction testing (literature). Exact composition for this catalog item is not specified here; refer to CoA/Spec Sheet.

• CAS: Not specified for this item; refer to CoA/Spec Sheet.

• Molecular formula: Not applicable (mixture). If required, consult CoA/Spec Sheet for component-level details.

• Molecular weight: Not applicable (mixture). Not specified for this item; refer to CoA/Spec Sheet.

• SMILES / InChI / InChIKey: Not applicable for mixtures; not assigned.

• Structural features (descriptive): As a semi-solid microbiological medium, the hydrated product forms a low-percentage gel suitable for stab inoculation to visualize radial bacterial migration (motility). It also contains nitrate as an alternative electron acceptor and, when used with appropriate reagents post-incubation, allows detection of nitrite or residual nitrate (literature).

• Synonym/Method: “Motility-Nitrate Medium, Method A” refers to an established test format combining motility determination with nitrate reduction assessment in one tube (literature).

Synthetic Utility

Not applicable. Motility-Nitrate Medium (Method A) is a culture medium for microbiology and has no role as a reagent or building block in chemical synthesis. For information relevant to this product, see Biological Roles, Application Protocols, and Storage & Reconstitution.

Target Specificity

Not applicable. This product is not an antibody or affinity reagent and has no target epitope or species specificity. Its performance is defined by its ability to support microbial growth and to differentiate motility and nitrate reduction phenotypes (see Application Protocols; literature).