Membrane Enterococcus Agar - BioReagent

Cat. No.: M1528641

CALIDAD & PUREZA BioReagent

Storage

Room temperature

Shipped In

Normal

Descripción general

For membrane filtration enumeration of enterococci in water or liquids

Especificaciones

Especificaciones y pureza

BioReagent

Condiciones de almacenamiento de almacenamiento

Room temperature

Enviado en

Normal

Grado

BioReagent

Product Line

Productos biológicos

Application Protocols

The following is general, literature-based guidance for membrane filtration using enterococcus-selective agar. It is not item-specific; consult your CoA/Spec Sheet and governing method.

Membrane filtration enumeration (general):

• Reconstitution: Prepare agar plates per manufacturer’s instructions (see Storage & Reconstitution). Allow plates to dry prior to use to prevent membrane slippage.
• Sample processing:
  • Choose sample volume (e.g., 10–100 mL) based on expected contamination; use serial dilutions if necessary.
  • Filter through a sterile 0.45 µm membrane using a sterile filtration unit. Rinse funnel with sterile buffered diluent if specified by the method.
• Plating:
  • Using sterile forceps, place the membrane on the agar surface (grid up). Remove trapped air by gently rolling with sterile spreader/forceps tip.
• Incubation:
  • Invert plates and incubate at an elevated temperature favorable for enterococci (commonly 41–44 °C) for 24–48 h (literature/general). Maintain humidity to prevent plate desiccation.
• Reading and confirmation:
  • Count colonies exhibiting the characteristic appearance for presumptive enterococci per your method. Perform required confirmatory steps (e.g., secondary selective medium, biochemical or enzymatic tests).
• QC controls:
  • Run positive and negative control strains with each lot/preparation. Record pH, sterility checks, and growth promotion outcomes.

Disposal: Autoclave used plates and membranes prior to disposal in accordance with institutional biosafety protocols.

Biological Roles

The product itself has no biological role; it is a culture medium designed to support or restrict growth of bacteria for analytical purposes.

Context (literature/general on Enterococcus):

• Enterococcus spp. (e.g., E. faecalis, E. faecium) are Gram-positive, facultatively anaerobic cocci that colonize the gastrointestinal tract of humans and animals. They are used as fecal indicator bacteria in water quality monitoring due to their persistence in marine and freshwater environments.
• Selective media for enterococci typically exploit intrinsic resistances and metabolic traits to differentiate them from other lactic acid bacteria and streptococci (e.g., tolerance to bile/salts, growth at elevated temperatures, and ability to reduce certain indicators; literature/general).

Use implication:

• By providing specific nutrients and selective/differential agents, Membrane Enterococcus Agar aims to preferentially support the growth and visual identification of enterococci under controlled incubation conditions (principle-level description; formulation specifics for this item are not provided).

Buffer Applications

Not applicable. This product is a microbiological culture medium, not a buffering reagent. While prepared media have a controlled pH, they are not used as analytical buffer systems.

For pH-sensitive procedures, consult the relevant standard method for the recommended incubation pH of the prepared medium and verify with a calibrated pH meter after sterilization (literature/general).

Green Alternatives

Green chemistry considerations for microbiological media focus on waste minimization, energy use during sterilization, and materials sourcing rather than solvent replacement.

• Energy reduction (general):
  • Use validated media sterilization cycles to avoid over-processing (e.g., correct load, venting, and 121 °C hold time), reducing autoclave energy consumption.
  • Prepare only the volume needed to minimize discarded expired plates.
• Materials and plastics (general):
  • Consider reusable glassware (media bottles, glass Petri dishes) where biosafety and QA practices allow, to reduce single-use plastics.
  • If using disposable Petri dishes/membranes, select suppliers offering take-back or recycling programs (where permitted).
• Water conservation (general):
  • Optimize membrane filtration rinsing steps to the minimum volumes specified by the method.
• Alternative media (general, tradeoffs):
  • Chromogenic broths or ready-to-use plates can reduce in-lab energy use but may increase packaging waste and shipping footprint.
  • Dehydrated base plus on-site preparation offers flexibility and reduced cold-chain, but requires autoclave energy and generates glassware washing effluent.

No item-specific “greener” formulation details are provided. For sustainability reporting, document autoclave cycles, plate yields, and disposal volumes to identify reduction opportunities.

Pharmaceutical Uses

No pharmaceutical or clinical use is claimed or intended. For research use only (per item-specific note).

Industry context (literature/general):

• Microbiological agar media may be used in quality control labs for environmental monitoring and microbial limits testing. When media are used in GMP environments, they are typically qualified/validated in-house for growth promotion, selectivity, sterility, and pH.
• If alignment to compendial methods (e.g., pharmacopeial microbial tests) is required, verify suitability with the specific method and perform growth promotion testing using the prescribed strains. This item’s compliance to any pharmacopeial monograph or sterilization/irradiation status is not specified; refer to CoA/Spec Sheet.

Physical Properties

• Appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Grade/Purity: BioReagent (see Quality & Grades tab).
• Storage conditions: Room temperature (item-specific, see Storage tab).
• Shipping: Normal (item-specific).

Literature/general characteristics for dehydrated microbiological agar media (not item specifications):

• Typical physical state: Free-flowing, hygroscopic dehydrated powder that forms a firm gel upon dissolution and sterilization; gel strength depends on agar content.
• Solubility: Readily dispersible in purified/distilled water with heating; insoluble in organic solvents.
• pH (prepared medium): Typical enterococcal media are adjusted near neutral (e.g., ~7.1–7.4 at 25 °C) before sterilization (literature/general). Exact pH for this item is not specified.
• Density, refractive index, logP, BP/MP: Not applicable to the dehydrated mixture; not typically reported.

Practical implications (general):

• Hygroscopicity means containers should be kept tightly closed to prevent caking and variability in prepared medium.
• Final medium clarity and color can vary depending on differential indicators included in the specific formulation (literature/general).

Quality and Grades

• Item-specific grade: BioReagent.

What BioReagent generally implies (literature/general):

• Suitable for laboratory biological applications, including routine culture and microbiology workflows where consistent growth and selectivity are important.
• Emphasis on batch-to-batch performance metrics relevant to microbial growth (e.g., productivity/selectivity tests against control strains), rather than ultra-trace chemical purity.

Performance/quality considerations for membrane filtration media (general):

• Growth promotion/selectivity testing against reference strains (e.g., Enterococcus faecalis as a positive control; representative non-targets as negatives) are commonly employed during QC (literature/general). Exact QC panel for this item is not specified.
• Low background and clear differentiation on membranes or poured plates are key; clarity and color of medium after preparation can be part of release criteria.

Documentation:

• For item-specific performance specifications, recommended inoculum levels, pH after sterilization, and composition tolerances, consult the product’s CoA/Spec Sheet. Where regulatory or standard-methods alignment is required (e.g., membrane filtration of water samples), verify suitability against the method’s acceptance criteria using in-house controls.

Reaction and Applications

This product is not a chemical reagent for synthetic reactions. Its applications are microbiological.

Applications (literature/general for Membrane Enterococcus-type media):

• Selective isolation and enumeration of Enterococcus spp. from water and environmental samples, typically by membrane filtration. The selectivity suppresses competing Gram-negative and many Gram-positive non-enterococcal flora, supporting detection of fecal indicator bacteria.
• Differentiation of presumptive enterococci via color or reduction-based indicators (e.g., tetrazolium reduction to red/maroon colonies in some formulations), facilitating rapid colony recognition (literature/general; specific indicators vary by formula and are not specified for this item).
• Verification workflows: Colonies may be subjected to confirmatory tests (e.g., esculin hydrolysis, PYR, or molecular methods) depending on the governing standard method (general practice; not item-specific).

Practical tips (general):

• Optimize sample volume to avoid overgrowth on the membrane; dilute high-biomass samples.
• Ensure proper incubation temperature and time per the chosen method (e.g., elevated temperatures to favor enterococci; see Reaction Conditions/Protocols tabs for literature ranges).
• Use appropriate positive and negative control strains with each batch of plates to verify performance.
• Handle membranes with sterile forceps; place aseptically on the agar surface to avoid trapped bubbles.

Reaction Conditions

Microbiological “reaction” conditions for enterococci recovery (literature/general guidance; not item-specific specifications):

• Preparation (typical for dehydrated agar media):
  • Suspend the indicated mass of dehydrated medium in purified water, heat to dissolve with gentle agitation. Adjust pH if required by the method. Sterilize by autoclaving at 121 °C for ~15 minutes. Cool to ~45–50 °C and pour plates under aseptic conditions. Exact mass per liter and target pH for this item are not specified; refer to CoA/Spec Sheet.
• Membrane filtration workflow (general):
  • Filter an appropriate sample volume (commonly 10–100 mL of water) through a sterile 0.45 µm membrane. Place membrane onto the agar surface, avoiding bubbles.
  • Incubation temperature/time: Many enterococcus membrane methods employ elevated temperatures (e.g., 41–44 °C) for 24–48 hours to enhance selectivity (literature/general; consult your governing method such as Standard Methods or agency protocols for exact conditions).
• Controls:
  • Include positive control (reference Enterococcus strain) and negative controls (uninoculated plate; representative non-targets) to verify selectivity and productivity.
• Expected outcomes (general):
  • Presumptive enterococcus colonies display characteristic coloration/appearance depending on the differential indicator system used in the formulation; follow your method’s confirmation steps to verify identity.

Always align conditions with the standard method in use (e.g., regulatory water testing protocols) and your laboratory’s QA requirements.

Safety and Handling

Item-specific hazard data:

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

General safety guidance for dehydrated culture media (literature/general; not a substitute for the SDS):

• PPE: Wear lab coat, safety glasses, and suitable gloves. Avoid generating dust; use local exhaust when weighing to minimize inhalation of nuisance dust.
• Incompatibilities: Avoid moisture uptake; store away from strong oxidizers and strong acids/bases that could degrade organic components (general precaution).
• Thermal hazards: Prepared media are typically sterilized by autoclaving (121 °C). Use heat-resistant gloves and caution when handling hot liquids and pressurized vessels.
• Microbiological risk: The dehydrated medium itself contains no live organisms. However, once inoculated, plates or broths may harbor viable enterococci and other microbes; handle post-incubation materials using BSL-2 good microbiological practices with appropriate decontamination (e.g., autoclave waste before disposal; follow institutional biosafety procedures).
• First aid (overview): If inhaled (dust), move to fresh air; if on skin/eyes, rinse with water; if ingested, rinse mouth. Seek medical attention if symptoms persist. Refer to SDS for detailed measures.

Always consult the product SDS and your institution’s safety protocols for authoritative hazard and handling instructions.

Solvent Selection

Not a solvent. This product is a dehydrated culture medium intended to be reconstituted in purified water.

General guidance (literature/general):

• Use freshly prepared, high-purity water (e.g., ASTM Type I or II) for dissolution to minimize inhibitory ions and chlorine/chloramine residuals that can impede microbial growth.
• Avoid organic solvents; medium components are designed for aqueous systems and may denature or precipitate in nonaqueous environments.
• If your application requires membrane filtration, final medium is typically poured into Petri plates or used as absorbent pads saturated with prepared medium; the “solvent” context is simply the aqueous matrix.

Choice versus alternatives (general):

• For enterococci testing, Membrane Enterococcus Agar is chosen over non-selective nutrient agars because it includes selective/differential agents that suppress non-target flora and aid recognition of presumptive colonies.
• Chromogenic variants or broth-based alternatives may be preferred for high-throughput screening or when direct colorimetric discrimination is advantageous; selection depends on regulatory method compatibility and sample background.

Storage and Reconstitution

Item-specific storage/shipping:

• Storage conditions: Room temperature.
• Shipped: Normal.

Shelf life and composition details: Not specified for this item; refer to CoA/Spec Sheet.

General guidance for dehydrated microbiological media (literature/general; verify with your lab’s SOP and the CoA):

• Storage of dehydrated medium:
  • Keep container tightly closed in a cool, dry place. Protect from moisture and excessive heat. Use desiccant where appropriate. Avoid prolonged exposure to light if chromogenic/indicator components are present (unknown for this item).
• Reconstitution (typical procedure outline):
  • Weigh the manufacturer-recommended mass of dehydrated medium per liter of purified water (exact grams/L for this item are not specified).
  • Disperse with stirring and gentle heat until completely dissolved. Adjust pH if required by your method.
  • Sterilize by autoclaving at 121 °C for ~15 minutes. Do not overheat to prevent sugar/indicator degradation.
  • Cool to 45–50 °C, mix gently to ensure homogeneity, and pour sterile Petri dishes. Allow to solidify and dry surface before use.
• Prepared plates:
  • Store inverted at 2–8 °C in sealed sleeves or bags to limit dehydration. Use within the period defined by your QC program. Warm to room temperature before use; check for contamination or desiccation.

For research use only.

Structure and Identity

Membrane Enterococcus Agar is a complex, multi‑component microbiological culture medium, not a single defined chemical substance.

• Item-specific identifiers:
  • CAS: Not specified for this item; refer to CoA/Spec Sheet.
  • Molecular formula: Not applicable (mixture of constituents).
  • Molecular weight: Not applicable (mixture).
  • InChIKey / SMILES: Not applicable for complex media.
• Identity description (general):
  • Type: Dehydrated selective/differential agar medium formulated for isolation and enumeration of Enterococcus spp. by membrane filtration or direct plating (literature/general).
  • Structural features: Contains a gelling matrix (agar) plus complex nutrients and selective/differential agents; no single 2D molecular structure can represent the product (general).
• Nomenclature notes (general):
  • Often used in water quality testing workflows where enterococci serve as fecal indicator bacteria (literature/general).

Because this is a formulated mixture, traditional molecular identifiers (SMILES, InChI) do not apply. For exact composition and lot-specific identity testing, consult the product’s CoA/Spec Sheet.

Synthetic Utility

Not applicable. Membrane Enterococcus Agar is not a synthetic organic reagent or building block and does not participate in chemical transformations.

For laboratory planning, see the Reaction & Applications and Application Protocols tabs for its microbiological utility.

Target Specificity

Item-specific target details (e.g., antigen/epitope) are not applicable; this is not an antibody or biochemical probe.

Functional specificity (literature/general for Membrane Enterococcus-type media):

• Designed for selective recovery of Enterococcus spp. while inhibiting much of the background flora present in environmental samples. Selectivity arises from inclusion of inhibitory compounds and incubation parameters that favor enterococci.
• Differential components aid recognition of presumptive colonies by color or reduction reactions. Exact inhibitors and indicators for this item are not specified; refer to CoA/Spec Sheet.