Stuart Transport Medium - BioReagent

Cat. No.: S1528335

QUALITÄT & REINHEIT BioReagent

Storage

Room temperature

Shipped In

Normal

Übersicht

For collection, transport, and preservation of pathogenic bacteria specimens

Spezifikationen

Spezifikationen & Reinheit

BioReagent

Storage

Room temperature

Verschickt in

Normal

Note

BioReagent

Product Line

Biologische Produkte

Application Protocols

General research workflow for using a transport medium (literature guidance; adapt to local SOPs and to the supplied product format):

• Preparation:
  • If provided ready-to-use: Verify container integrity and expiration; equilibrate to room temperature.
  • If provided as dehydrated powder: Prepare with purified water to the labeled concentration, mix until fully dissolved, dispense, and sterilize (e.g., autoclave) as appropriate. Allow to cool to semisolid. This is general guidance; item-specific instructions are not provided here.
• Sampling:
  • Aseptically collect the specimen using a compatible swab.
  • Insert the swab into the transport tube, ensuring the tip is submerged/embedded in the medium; break the shaft at the scored mark if present and close securely.
• Transport/holding:
  • Maintain closed containers at the validated temperature range for your organisms of interest; avoid extreme heat/cold and desiccation.
  • Minimize transit time; document collection and receipt times.
• Processing:
  • Upon arrival, aseptically remove the swab and inoculate appropriate culture media or prepare for downstream analyses (e.g., microscopy, molecular extraction) according to SOPs.
• Quality controls:
  • Include control swabs with known organisms to verify recovery after defined holding times in your research context.

Biological Roles

Stuart Transport Medium is not a biomolecule but functions as an engineered microenvironment that preserves microbial viability (literature/general):

• Homeostasis support: Buffering maintains near-neutral pH to reduce stress-induced cell death.
• Redox control: Mild reducing conditions mitigate oxidative damage, benefiting oxygen-sensitive organisms.
• Nutrient limitation: Minimal nutrients discourage overgrowth, preserving relative abundance of organisms at collection.
• Physical protection: Semisolid matrix immobilizes cells and limits oxygen diffusion, reducing shear and aeration stress.
• Downstream compatibility: Designed to allow subsequent culture, microscopy, or molecular workflows (e.g., plating, Gram staining, nucleic acid extraction) with minimal inhibitory carryover (specific compatibility varies by formulation and assay).

These roles are relevant to microbiology research workflows and environmental sampling. No medical or clinical claims are made; use is limited to research laboratory applications.

Buffer Applications

This product is a transport medium rather than a conventional analytical buffer. While classical Stuart formulations include buffering salts that stabilize pH near neutrality (literature), it is not typically used to prepare defined pH buffers for spectroscopic assays, chromatography, or enzymology.

• If buffer-like behavior is required: Use dedicated buffer systems (e.g., phosphate, HEPES, MOPS) formulated at defined molarity and pH.
• Within transport context: The built-in buffering in Stuart medium helps maintain sample pH during short-term holding, thereby supporting organism viability without promoting growth (literature/general).

For buffer recipes, capacities, and ionic strengths, consult dedicated buffer products; these parameters are not specified for this item.

Green Alternatives

As an aqueous, non-solvent microbiological matrix, Stuart Transport Medium already avoids many environmental burdens associated with volatile organic solvents. Sustainability considerations (literature/general):

• Comparison of transport media:

  • Stuart (classical): no charcoal, simple salt/reducing system; minimal downstream interference; straightforward aqueous waste stream.
  • Amies (with charcoal): can improve viability for certain fastidious organisms but adds particulate waste and potential adsorptive losses of analytes.
  • Cary–Blair: suited for enteric samples; slightly different buffering and pH; similarly aqueous and low-toxicity.

• Greener practices:

  • Use prefilled, correctly portioned units to reduce waste from partial containers.
  • Choose recyclable components (e.g., PP tubes) and segregate clean vs. biohazard waste properly to minimize incineration volume.
  • Implement SOP-controlled holding times to reduce repeated sampling and associated consumable use.
  • Where feasible, validate room-temperature transit windows to avoid cold-chain energy use, consistent with organism stability needs (define per SOP; literature-supported for certain targets).

• Trade-offs: Higher-performance media (e.g., with charcoal) can increase material intensity and complicate analytical recovery. Selection should balance organism coverage, analytical compatibility, and waste footprint.

Pharmaceutical Uses

No therapeutic or clinical diagnostic claims are made for this product. In research and industrial microbiology settings (literature/general), Stuart Transport Medium may be used as:

• A sampling/transport matrix for environmental monitoring programs or aseptic process simulations within development laboratories.

• A QC support material in research related to preservative efficacy or microbial recovery studies (non-clinical).

• A training/calibration aid for validating swabbing and transport procedures in R&D contexts.

• Notes:

  • This item is labeled: For research use only (item-specific). It is not intended for use in human or animal diagnostics, treatment, or clinical procedures.
  • Pharmacopeial status, compendial references, or device clearances are not specified for this item.

Physical Properties

• Appearance: Not specified for this item; refer to CoA/Spec Sheet.
• State: Typically supplied either as a dehydrated powder, liquid, or prefilled swab tube (literature); item-specific format not specified.
• pH: Near-neutral pH is typical for Stuart formulations (literature, commonly around pH ~7.3 at 25 °C), but not specified for this item.
• Solubility: Aqueous, fully water-based (literature). Insoluble in organic solvents.
• Ionic strength/osmolality: Formulation-dependent; not specified for this item.
• Boiling point / melting point / density / refractive index: Not specified for this item; not generally applicable for semisolid media.
• Color: Classically colorless to pale (a faint blue hue may appear if a redox indicator is included and oxidized; literature); not specified for this item.
• Redox behavior (literature): Contains a mild reducing component to maintain low Eh; oxidation can be visually indicated if a dye is present.
• Notes:
  • Properties vary by exact manufacturer formulation and format. For precise QC attributes (pH after preparation, gel strength, indicator presence), consult the product’s CoA/Spec Sheet.

Quality and Grades

• Grade/Purity (item-specific): BioReagent.
  • BioReagent grade generally indicates suitability for biological laboratory use, with controlled composition and contaminants consistent with microbial work.
• What this means in practice:
  • Appropriate for maintaining viability of microorganisms during sample transport/holding in research workflows.
  • UV/visible background, heavy metals, and trace impurities are not typically critical performance drivers for transport media; specific impurity limits are formulation-dependent and not specified for this item.
• Sterility: Not specified for this item. Some transport media are provided pre-sterilized (ready-to-use), others as dehydrated powder requiring sterilization. Verify on label/CoA.
• Indicator and reducing agent content: Presence and level are formulation-specific; not specified for this item.
• Compliance/standards: No pharmacopeial or clinical compliance claims are made here. For research use only (item-specific note).
• User QC recommendations (general):
  • If preparing from powder, verify pH and gel firmness after sterilization (literature practice).
  • Include positive-control organisms appropriate to intended research to confirm maintenance of viability over defined intervals.

Reaction and Applications

This product is designed for microbiological specimen transport, not for chemical synthesis. Key research applications (literature/general):

• Maintenance of viability without growth: The low-nutrient, buffered, semisolid, mildly reducing environment preserves physiological state while limiting replication.
• Support for oxygen-sensitive organisms: The reducing component and semisolid matrix limit oxygen diffusion.
• Specimen stabilization during transit: Minimizes overgrowth of commensals and metabolic changes that could compromise downstream identification.
• Common use cases:
  • Collection and research transport of swab-based specimens (e.g., from surfaces, environmental sampling).
  • Temporary holding of isolates when immediate subculture is not possible.
• Practical tips (literature):
  • Avoid overheating or prolonged light exposure that may degrade indicators or oxidize the medium.
  • Keep caps tightly closed to limit oxygen ingress; do not shake vigorously to avoid aeration.
  • Time-to-culture should be minimized to maintain representative populations; define acceptable holding times in your SOPs.
  • If the medium includes a redox indicator, a persistent blue coloration (oxidized form) suggests inadequate reduction; replace or re-reduce as appropriate in research workflows.
• Not intended for chemical reactions, catalysis, or chromatographic applications.

Reaction Conditions

Classical chemical reaction parameters (temperature, catalysts, yields) do not apply. For microbiology research usage (literature/general guidance; establish lab-specific SOPs):

• Temperature during transport/holding: Often ambient conditions are acceptable for short durations with Stuart medium; exact limits depend on organism stability and should be validated in-house. Avoid freezing unless specifically validated, as freeze–thaw can reduce viability.
• Atmosphere: Keep containers closed to limit oxygen ingress and evaporation. Do not vigorously aerate.
• Light: Protect from prolonged intense light if a redox indicator (e.g., methylene blue) is included, as photobleaching/oxidation can occur.
• Time: Define maximum holding times suited to your target organisms and downstream methods; minimize delays before processing.
• Agitation: Not required; gentle handling preserves the semisolid matrix and sample integrity.

These points are general literature practices for transport media and are not item-specific specifications.

Safety and Handling

• GHS classification / Signal word / H-statements / Pictograms: Not specified for this item; refer to the SDS for authoritative safety data.
• General safety profile (literature/typical for transport media):
  • Non-nutritive, aqueous medium; low intrinsic chemical hazard under normal handling.
  • Becomes a potential biohazard after inoculation with microorganisms; handle inoculated media under appropriate biosafety level (BSL) practices.
• PPE: Laboratory coat, gloves, and eye protection. Use biological safety cabinet (BSC) when handling live cultures or clinical-type specimens in research settings.
• Incompatibilities: Avoid contamination with strong oxidizers (can defeat reducing capacity) and avoid desiccation or overheating that may alter gel/chemistry.
• Hygiene: Do not ingest or inhale aerosols. Avoid skin/eye contact. Wash thoroughly after handling.
• First aid (overview): Rinse skin/eyes with water in case of contact. If inhaled as aerosol, move to fresh air. Seek medical attention if irritation persists. Follow institutional incident reporting.
• Spill/cleanup: For uninoculated medium, absorb and rinse with water. For inoculated medium, treat as biohazard—disinfect (appropriate contact time) and dispose per institutional biosafety procedures.
• Waste disposal: Autoclave or disinfect inoculated materials before disposal according to local regulations.
• Always defer to the product SDS and institutional biosafety guidelines.

Solvent Selection

This product is an aqueous transport medium rather than an organic solvent; classic solvent-selection considerations do not apply.

• Polarity/miscibility: Fully water-based (literature). Not intended to be mixed with organic solvents.
• Use context: Selected when a non-nutritive, near-neutral, mildly reducing, semisolid environment is needed to maintain microbial viability without proliferation during transport/holding.
• When to choose:
  • Prefer over nutrient broths when you must limit growth and metabolic change during transit.
  • Prefer over dry swabs when desiccation risk or oxygen exposure could compromise viability.
• Alternatives (literature):
  • Amies medium (with/without charcoal): broader organism coverage; charcoal can absorb inhibitors but may interfere with some downstream assays.
  • Cary–Blair medium: optimized for enteric pathogens; higher pH and low nutrients.
• For extraction, chromatographic, or synthetic applications, refer to standard solvent-selection guides; Stuart medium is not used as a reaction solvent.

Storage and Reconstitution

• Storage conditions (item-specific): Room temperature.
• Shipping (item-specific): Shipped under normal conditions.
• Format: Not specified for this item (powder vs. ready-to-use tubes vs. swab systems). Check product label/CoA.
• Reconstitution (general literature guidance if supplied as powder):
  • Add the labeled mass of dehydrated medium to purified water to the target volume.
  • Heat with gentle stirring to dissolve completely; avoid boiling over.
  • Dispense into tubes, cap loosely, and sterilize as appropriate (e.g., autoclave). Allow to cool to form the semisolid matrix; tighten caps after cooling.
  • Verify pH after preparation per SOP; adjust only if within manufacturer-allowed limits.
• Freeze–thaw: Not recommended unless validated; repeated freeze–thaw can alter gel properties and organism recovery.
• Shelf life: Not specified for this item; refer to label/CoA. In general, avoid prolonged storage after preparation; monitor for dehydration, contamination, or indicator oxidation.
• Research use note (item-specific): For research use only.

Structure and Identity

Stuart Transport Medium is a classical, semisolid, non-nutritive microbiological transport matrix designed to maintain specimen viability without significant growth during transit.

• Item type: Complex mixture/finished medium (not a single chemical entity)
• Molecular formula: Not applicable to mixtures; not specified for this item.
• Molecular weight: Not applicable to mixtures; not specified for this item.
• CAS / CID / InChIKey / SMILES: Not applicable to mixtures; not specified for this item.
• Structural features (general literature):
  • Buffering component typically based on inorganic/organophosphate salts (e.g., glycerophosphate) to maintain near-neutral pH.
  • Reducing agent (e.g., sodium thioglycolate) to lower redox potential and protect oxygen-sensitive organisms.
  • Redox indicator (e.g., methylene blue) often included as an oxidation–reduction indicator (should remain colorless under reduced conditions).
  • Semisolid matrix (low-percentage agar) to prevent oxygen diffusion and immobilize specimens while avoiding overgrowth.
• 2D description in words (general): An aqueous, low-nutrient, phosphate-buffered, semisolid gel containing a mild reducing environment and (in classical formulas) a trace redox dye; there is no discrete molecular structure as this is a defined blend of small molecules and agar.

Synthetic Utility

Not applicable. Stuart Transport Medium is not a reagent for organic synthesis or materials chemistry. It does not serve as a nucleophile, electrophile, catalyst, ligand, or solvent in chemical transformations.

• For chemical synthesis tasks, select appropriate reagents and solvents (e.g., anhydrous solvents, catalysts, building blocks) from dedicated product lines.
• This medium should be reserved for its intended role in microbiology research: preservation of microorganism viability during short-term storage and transport.

Target Specificity

No target specificity. This is a general-purpose transport medium; it is not an antibody, probe, primer, or affinity reagent. It does not have species, antigen, clone, or isotype attributes.

Häufig gestellte Fragen

How should this product be stored?

Store at room temperature.