Water Agar Medium - BioReagent

Cat. No.: W1528461

GRAU & PUREZA BioReagent

Storage

Room temperature

Shipped In

Normal

Visão geral

For use as an overlay in total bacterial count determination of feed

Especificações

Especificações e pureza

BioReagent

Condições de armazenamento de armazenamento

Room temperature

Enviado em

Normal

Grau

BioReagent

Product Line

Produtos biológicos

Application Protocols

No item-specific, validated protocols are provided in the Product Data for this medium.

• Tested applications, recommended conditions, and performance parameters: Not specified for this item; refer to CoA/Spec Sheet and your laboratory’s SOPs.
• General note: Water Agar Medium is commonly prepared, sterilized, and poured into plates under aseptic conditions; method details (e.g., agar concentration, volumes, temperatures) are laboratory- and application-specific and should be validated locally.

Biological Roles

Water Agar Medium is designed to be biologically inert with respect to nutrition, providing a hydrated, solid surface without supplying carbon, nitrogen, or growth factors. This enables controlled biological observations and manipulations.

• Agar polysaccharide (general biology):
  • Composed largely of agarose (neutral) with a smaller agaropectin fraction (weakly anionic). Most microorganisms cannot metabolize agar; thus it serves as a passive scaffold.
  • Thermo-reversible gel facilitates sterile handling: pour warm, add labile supplements post-sterilization, then solidify at room temperature.
• Biological utility of a minimal matrix:
  • Supports spore germination studies by limiting exogenous nutrients, highlighting endogenous reserves and developmental signals.
  • Used for hyphal tip culture and isolation, reducing aerial mycelium and enabling clean transfers.
  • Serves as a base for diffusion-based assays (e.g., localized nutrient, inhibitor, or volatile exposure), where absence of background nutrients enhances contrast.
• Osmotic and ionic context: With only water and agar, osmolarity is very low; if organisms require specific osmotic/ionic conditions, supplements or buffered diluents must be incorporated.

Note: No clinical/diagnostic claims are made. For organism-specific work, align the medium and any supplements with validated standards or method compendia.

Buffer Applications

Water Agar Medium does not provide buffering capacity and is not intended as a buffer system.

• If pH control is required, prepare the medium using a defined buffer (e.g., phosphate, citrate, MOPS) as the solvent prior to sterilization, or add sterile buffer post-autoclave at ~45–50 °C (general practice).
• For electrophoresis or biochemical assays requiring fixed ionic strength, use dedicated buffered gels or solutions; Water Agar is primarily a microbiological solid support.

Green Alternatives

From a green chemistry perspective, Water Agar Medium is already an aqueous, largely benign system. Considerations and alternatives (literature/general):

• Renewable source: Agar is derived from red algae (renewable marine biomass). Avoid overharvesting by preferring sustainably sourced materials.
• Energy use: Autoclaving consumes significant energy; consolidate sterilization cycles and use validated hold times to minimize waste while maintaining sterility.
• Waste minimization: Prepare only the volume needed. Solidified agar can often be re-melted if uncontaminated (avoid repeated cycles to prevent degradation and discoloration).
• Alternative gellants: Gellan gum (microbial polysaccharide) can substitute agar in some workflows, offering transparency and lower required concentrations; however, gellan may require divalent cations for optimal gelation.

Comparison (general, literature-based; not product specs):

• Agar: Renewable marine polysaccharide; gels at ~32–40 °C, melts ~80–95 °C; broadly inert to microbes; reliable plate firmness at ~1–1.5%.
• Gellan gum: Fermentation-derived; strong, brittle gels at lower % (~0.2–0.6%); may need Ca2+/Mg2+; excellent clarity; different texture for motility assays.

Trade-offs: Agar is widely standardized across microbiology methods; switching gellants may alter organism behavior, motility, or nutrient diffusion characteristics. Validate alternative media prior to adoption.

Pharmaceutical Uses

Water Agar Medium is for research use only (per Product Data). No medical or clinical uses are claimed.

• Typical role in regulated environments (general, non-clinical): May be used in microbiology laboratories for environmental or process research, organism handling, or method development where a non-nutritive solid surface is needed.
• Not an excipient: Agar as a raw material has historical use as a thickener in various industries, but this specific product is not designated for pharmaceutical formulation or GMP manufacturing unless otherwise documented.
• Documentation: For any quality-controlled application, verify lot-specific attributes (e.g., sterility, contaminants, performance) against your internal specifications using the product’s CoA/Spec Sheet.

Research Use Note: For research use only.

Physical Properties

Item-specific physico-chemical specifications are not provided for this catalog entry.

• Appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Density, pH (of prepared medium), water content, ash, UV cutoff: Not specified for this item; refer to CoA/Spec Sheet.
• Solubility (literature, general for agar): Insoluble in cold water; swells and absorbs water. Dissolves upon heating near boiling in water and forms clear solution; upon cooling, forms a firm gel at low percent solids.
• Thermal transitions (literature, general for agar-based media):
  • Typical gelation (gelling) temperature ~32–40 °C (composition-dependent).
  • Typical melting (sol) temperature ~80–95 °C (hysteresis between melt and gel).
• Viscosity/gel strength (literature, general): Gel strength increases with agar concentration; 1.0–1.5% w/v typically yields firm plates; exact values depend on source and agaropectin content.
• Ionic character (general): Largely non-ionic matrix; buffering capacity arises only from the diluent (water); Water Agar Medium is effectively unbuffered unless additives are introduced.

Note: The above literature values are provided for context and are not specifications for this product lot. Consult the product’s CoA/Spec Sheet for any guaranteed properties.

Quality and Grades

• Grade: BioReagent (as provided in Product Data)
  • Meaning (general): Suitable for biological research and routine laboratory use; typically produced under controls that support reproducibility in life-science workflows. BioReagent grade does not inherently guarantee cell-culture, clinical, or GMP suitability unless explicitly stated.
• Item-specific performance metrics (e.g., sterility, microbial limits, gel strength, ash, clarity, pH of 1.5% gel): Not specified for this item; refer to CoA/Spec Sheet.
• Stabilizers/Preservatives: Not specified for this item; refer to CoA/Spec Sheet. Agar media typically do not contain chemical stabilizers; sterility and dryness preserve quality (general).
• Storage conditions: Room temperature (per Product Data). Keep container tightly closed, dry, and protected from humidity to prevent caking or premature gelation (general practice).
• Shipping: Normal (per Product Data).
• What to verify on receipt (practical guidance):
  • Integrity of packaging and desiccation; absence of moisture intrusion.
  • If dehydrated, check free-flowing character and absence of clumps; if ready-to-use, check clarity and absence of contamination.
  • Review CoA for lot-specific performance criteria (e.g., gel clarity/strength, sterility testing), if provided.

Note: For regulated applications (e.g., environmental monitoring, food/water testing under specific standards), match the product’s documented performance to the relevant method requirements.

Reaction and Applications

Water Agar Medium is a minimal, unnutritive solid medium valued for its neutrality and clarity. Typical laboratory applications (literature/general) include:

• Fungal and mold work: Spore germination assays, hyphal tip isolation, and reducing competitive overgrowth by limiting nutrients.
• Isolation from environmental/plant material: Plating surface-sterilized tissues to encourage slow-growing fungi or actinomycetes without rapid bacterial swarming.
• Motility/behavior assessments (organisms that move on low-nutrient surfaces) by adjusting agar concentration to modulate surface hardness (general practice).
• Enumeration/dilution plating when the goal is to recover organisms without selective pressure from nutrients; nutrients can be supplied locally (e.g., overlay or point-source).
• Matrix for overlays: Serving as a base layer under selective/nutritive overlays to spatially segregate metabolites or phages.

Practical tips (literature/general guidance; not product specifications):

• Dissolve agar in purified water by heating to near boiling with agitation; avoid localized scorching.
• Sterilize by autoclaving (121 °C, 15–20 min). Cool to 45–50 °C before adding heat-labile supplements.
• Typical plate pour: ~20–25 mL per 90 mm Petri dish for ~3–4 mm depth; adjust agar % to tune firmness (e.g., ~1.0–1.5% for firm plates; softer gels for motility).
• Label plates with medium identity and date; dry plates (lid ajar, laminar flow) briefly for optimal surface before inoculation.

Note: Exact preparation instructions, concentrations, and performance parameters are not specified for this item; consult method-specific SOPs and the product’s CoA/Spec Sheet.

Reaction Conditions

Conventional “reaction conditions” do not apply. However, for laboratory preparation and handling of Water Agar Medium, the following general, literature-based conditions are commonly used (not product specifications):

• Dissolution: Disperse agar in purified water; heat with stirring to near boiling until fully solubilized and clear.
• Sterilization: Autoclave at 121 °C for 15–20 minutes. Avoid prolonged sterilization that can cause Maillard/caramelization discoloration if nutrients are present (not applicable to plain water agar but still a consideration for supplements).
• Pouring temperature: Cool to ~45–50 °C before adding heat-labile additives and pouring plates to minimize condensation and thermal shock.
• Plate depth: ~3–4 mm (about 20–25 mL in a 90 mm dish) to achieve consistent diffusion and colony morphology.
• Storage of poured plates: Store inverted to reduce condensation; short-term at room temperature if used promptly, or at 2–8 °C for limited periods to retard contamination and dehydration (practices vary by lab SOP).

These guidelines are for context only. Exact procedures should follow your laboratory’s SOPs and the product’s CoA/Spec Sheet when available.

Safety and Handling

Hazard classifications and statements are not provided for this item.

• GHS classification, signal word, H/P statements, pictograms: Not specified for this item; refer to SDS.
• General laboratory safety (good practice):
  • Use appropriate PPE: lab coat, safety glasses, and gloves when handling powders, hot liquids, or molten agar.
  • Handle hot media cautiously; molten agar (≥80 °C) can cause severe burns. Allow to cool to ~50 °C before pouring plates (general practice).
  • Avoid inhalation of dust/aerosols from dehydrated media; may cause mechanical irritation.
  • Slips/falls hazard: spilled gel creates slick surfaces; clean promptly.
• Incompatibilities (general): Avoid strong oxidizers in preparation area. Do not autoclave in sealed containers without headspace/venting.
• Sterilization (general practice): Autoclave prepared aqueous medium at 121 °C for 15–20 min; avoid over-sterilization that may darken/caramelize and reduce clarity.
• First-aid overview (general): If inhaled (dust) — move to fresh air. Skin contact with hot medium — cool with running water; seek medical attention for burns. Eye contact — rinse cautiously with water for several minutes. If ingested — rinse mouth; seek medical advice. Always follow your institution’s protocols.

Always consult the product SDS for authoritative safety and regulatory information.

Solvent Selection

This product is an aqueous microbiological medium; “solvent selection” in the sense of organic synthesis is not typically applicable.

• Matrix: Water is the continuous phase; agar forms the gelling network upon cooling.
• Polarity and miscibility: Fully aqueous; miscible with water prior to gelation. Not intended for use in non-aqueous solvents.
• Practical note: If supplements (e.g., salts, buffers, antibiotics, carbon sources) are required, they are typically added to the sterile, cooled (~45–50 °C) molten medium to maintain activity and avoid thermal degradation (general practice).

For tasks involving microbial culture, see Reaction & Applications for use considerations.

Storage and Reconstitution

• Storage conditions (as provided): Room temperature. Maintain in a dry, tightly closed container to prevent moisture uptake (general good practice). Protect from microbial contamination.
• Shipped in: Normal (per Product Data).
• Reconstitution/preparation: Not specified for this item; refer to CoA/Spec Sheet.
• Stability after preparation: Not specified for this item; refer to CoA/Spec Sheet. As a general note, prepared plates are typically used promptly or stored under conditions that minimize dehydration and contamination, per lab SOPs.

Always follow your institution’s storage and sterility procedures. Research use only.

Structure and Identity

Water Agar Medium is a formulated microbiological medium comprised primarily of agar (a neutral galactose-based polysaccharide) dissolved in water. As a mixture/preparation, it does not have a single defined molecular structure.

• SKU: W1528461
• Product name: Water Agar Medium (BioReagent grade)
• Composition nature: Mixture/preparation (predominantly agar + water; may be supplied dehydrated or ready-to-use depending on catalog variant — appearance not specified for this item)
• Molecular formula: Not applicable to a mixture; not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight: Not applicable to a mixture; not specified for this item; refer to CoA/Spec Sheet.
• SMILES / InChI / InChIKey: Not applicable to a mixture; not specified for this item; refer to CoA/Spec Sheet.
• Structural features (general knowledge):
  • Agar is a heterogeneous linear polysaccharide consisting largely of agarose (repeating agarobiose disaccharide units of D-galactose and 3,6-anhydro-L-galactose) and agaropectin (sulfated, methylated derivatives).
  • Forms a thermo-reversible hydrogel network upon cooling from melt; gelation is physical (non-covalent) via hydrogen bonding and helix aggregation.
• 2D description in words (general knowledge): Polysaccharide backbone of alternating galactose-derived rings with occasional sulfate/methyl substituents (agaropectin fraction); absence of nitrogen and phosphorus in the gelling polymer; overall electrically neutral to weakly anionic depending on agaropectin content.

Synthetic Utility

This product is a microbiological medium and is not typically employed as a reagent in chemical synthesis.

• Chemical reactivity: Agar is a high–molecular weight polysaccharide with limited chemical functionality accessible under mild conditions; it is used as a physical support, not as a reactant.
• Laboratory role: Provides a hydrogel matrix for culturing and observing organisms, diffusion studies, or positioning of samples; occasionally used as a benign immobilization medium for physical measurements.

For synthetic chemistry applications, consider dedicated reagents and solvents; Water Agar Medium offers no particular advantages in reaction chemistry.

Target Specificity

Not applicable. Water Agar Medium is a general-purpose, non-nutritive microbiological medium and does not target specific biomolecular epitopes or organisms by design.

• Antigen/epitope, clone, isotype, species reactivity: Not applicable to this product type.

For organism-selective media, consult formulations with defined inhibitors, nutrients, or indicators.