LES Endo Agar - BioReagent

Cat. No.: L1528441

QUALITÀ & PUREZZA BioReagent

Storage

Room temperature

Shipped In

Normal

Panoramica

For coliform membrane filtration detection

Specifiche

Specifiche e purezza

BioReagent

Condizioni di conservazione di stoccaggio

Room temperature

Spedito in

Normal

Grado

BioReagent

Product Line

Prodotti biologici

Application Protocols

No manufacturer-validated protocols are provided for this listing. The following is general literature guidance for membrane filtration enumeration of coliforms using Endo-type media. Always adapt to your SOP and the product CoA.

• Materials (general):

  • Sterile filtration apparatus, 0.45 µm membrane filters, sterile forceps, prepared LES Endo-type plates or absorbent pads saturated with prepared medium, incubator (method-specified temperature), sterile dilution water.

• Procedure (general overview):

  1. Filter a measured volume of well-mixed sample through a sterile 0.45 µm membrane.
  2. Rinse filter if required by method to reduce inhibitory substances.
  3. Place membrane onto the prepared medium surface (plate) or onto a saturated absorbent pad ensuring no air bubbles.
  4. Invert and incubate at the method-specified temperature/time (e.g., ~35–37 °C for ~18–24 h; verify per method).
  5. Enumerate characteristic colonies (red with metallic sheen for lactose-fermenting coliforms) and record results as CFU per 100 mL or per sample volume.
  6. Confirmatory tests may be required by the method.

• QC controls:

  • Include positive/negative control strains to verify selectivity and differential response each lot/run.

Exact preparation parameters and acceptance criteria are Not specified for this item; refer to CoA/Spec Sheet.

Biological Roles

This product does not have an intrinsic biological role as a single biomolecule; it is a formulated culture medium supporting growth and differentiation of microorganisms.

• Functional role in microbiology (general, literature):

  • Nutritional support: Complex nitrogen sources (e.g., peptones/tryptose) supply amino acids, peptides, and growth factors required by enteric bacteria.
  • Differential response: Lactose serves as a fermentable carbohydrate; lactose fermentation produces acid that, together with an indicator system (e.g., sulfite–fuchsin in some Endo variants), yields characteristic colony coloration and sheen of coliforms.
  • Selectivity: Inhibitory components suppress many Gram-positive and non-target organisms, enriching recovery of coliforms from mixed samples.

• Use context:

  • Frequently applied to environmental and water microbiology to assess sanitary quality via the presence/levels of coliform group organisms.

Note: Exact component list and concentrations for this item are Not specified; consult the CoA/Spec Sheet for definitive details.

Buffer Applications

Not typically applicable. LES Endo Agar is a selective/differential culture medium, not a buffering reagent. While prepared media possess an inherent buffering capacity from their constituents, they are not used as standardized buffer systems. For buffering needs, use defined buffers (e.g., phosphate, Tris) prepared at specified pH and ionic strength.

Green Alternatives

For culture media, “green chemistry” considerations focus on waste minimization, energy use, and safer handling rather than solvent substitution.

• Comparative options (general):
  • Ready-to-use plates vs dehydrated media: RTU plates reduce user energy input and variability but increase shipping volume and cold-chain needs. Dehydrated media minimize transport mass and allow just-in-time preparation, reducing waste from expired plates.
  • Preparation efficiency: Prepare only the volumes required for planned work. Consolidate autoclave runs for other media where applicable; note that some Endo-type formulations are not autoclaved—follow the product instructions to avoid unnecessary energy use.
  • Waste management: Segregate biohazardous waste (post-incubation plates) and decontaminate prior to disposal, minimizing chemical disinfectant volumes when validated heat treatment is available.
  • Safer components: Some indicator dyes historically used in Endo media can be irritants or potential hazards. Where validated by your application, consider alternative differential media or chromogenic media with improved safety profiles (literature-dependent) while maintaining method compliance.

Trade-offs: Any change in medium type must be validated for equivalence in recovery and selectivity against the reference method. Always prioritize method compliance for regulatory testing.

Pharmaceutical Uses

No therapeutic or clinical uses. For research use only.

• Relevant non-clinical uses (general):

  • Environmental monitoring and water system surveillance within pharmaceutical and bioprocess facilities, when validated under site SOPs and applicable compendial/industry standards.
  • Microbiological quality assessments in manufacturing utilities (e.g., cooling water, rinse water) as part of hygiene programs, where appropriate and compliant with the governing method.

• Regulatory note:

  • If used in regulated environments, laboratories typically perform growth promotion testing (GPT) and method suitability checks with compendial strains to document medium performance by lot.

Item-specific pharmacopeial status and certifications: Not specified for this item; refer to CoA/Spec Sheet.

Physical Properties

• Item-specific physical properties:

  • Appearance: Not specified for this item; refer to CoA/Spec Sheet.
  • Molecular Weight (of mixture): Not applicable; Not specified for this item; refer to CoA/Spec Sheet.
  • Other specifications (pH of prepared medium, g/L, melting point, boiling point, density, refractive index): Not specified for this item; refer to CoA/Spec Sheet.

• General properties (literature, for Endo/LES Endo dehydrated media):

  • Supplied as a free-flowing, homogeneous dehydrated powder intended for reconstitution in purified water.
  • After preparation (pour plates or membrane-pad saturation), the medium is typically red to red-brown due to the indicator dye system; lactose-fermenting colonies often exhibit a metallic sheen under reflected light.
  • Typical working concentration, pH of prepared medium, and gel strength are formulation-dependent and vary across manufacturers; consult the product label/CoA for exact targets.

• Solubility and preparation notes (general):

  • Readily disperses in water with heating to dissolve. Overheating may degrade the indicator system in some Endo-type formulations (literature caution). Avoid local scorching; use gentle heat with stirring.
  • Sterilization approach is formulation-specific; some Endo variants are not autoclaved due to dye/sulfite sensitivity. Follow the product-specific instructions.

Quality and Grades

• Item-specific grade:

  • BioReagent: Supplied for laboratory research and analytical microbiology use. Not for human or animal consumption or diagnostic/therapeutic use.

• What BioReagent grade implies (general):

  • Consistency of nutrient and inhibitory components within batch specifications suitable for reproducible microbial growth studies and environmental/industrial QC assays.
  • Raw materials controlled to reduce lot-to-lot variability (e.g., peptone nitrogen content, dye potency), supporting standardized test methods when used with proper controls.

• Quality considerations for culture media (general guidance):

  • Critical performance attributes include recovery of target organisms, selectivity against non-targets, differential response (e.g., colony sheen for lactose fermenters), gel strength/clarity (if agar-based), and sterility post-preparation.
  • For regulatory or standard methods work (e.g., membrane filtration for coliforms), verify that the lot meets recovery/selectivity criteria using control strains as specified by the relevant method. Record lot numbers and perform growth promotion testing.

• Item-specific notes:

  • Exact acceptance criteria, component list, and preparation targets (g/L, pH, performance controls) are Not specified for this item; refer to CoA/Spec Sheet.

Reaction and Applications

Chemical reaction applications do not apply to this product. Instead, it is used in microbiological applications.

• Microbiological applications (general, literature):

  • Enumeration of total coliforms from water, beverages, and environmental samples, commonly via membrane filtration techniques using selective/differential Endo-type media.
  • Differentiation based on lactose fermentation: typical coliforms produce acid that interacts with the indicator system to yield characteristic red colonies with metallic sheen; non-lactose fermenters form colorless to pale colonies.
  • Environmental monitoring and quality control: suitable for trend analysis of process water and sanitation verification when used under appropriate standard methods.

• Practical tips (general):

  • Use fresh, properly prepared medium; excessive heating can impair the indicator system and selectivity in some Endo formulations.
  • Validate with control strains (e.g., representative coliform-positive and negative organisms) to verify performance for each lot and before critical testing.
  • Incubation conditions (temperature, time, atmosphere) should follow the governing method; deviations can alter selectivity and colony morphology.

Note: Manufacturer Applications are not provided for this listing. Apply method-specific protocols consistent with your laboratory’s SOPs and the product CoA.

Reaction Conditions

Classical chemical reaction conditions do not apply. The relevant conditions concern medium preparation and incubation for microbiological work.

• Preparation conditions (general, literature for Endo-type media):

  • Dissolve the specified mass of dehydrated medium in high-purity water with gentle heating and stirring until completely dissolved. Avoid prolonged or excessive heating, which can impair the indicator system.
  • Sterilization guidance is formulation-specific; some Endo-type media are not autoclaved due to dye/sulfite sensitivity. Follow the product label/CoA strictly.
  • For membrane filtration workflows, the medium may be used to saturate sterile absorbent pads or poured as plates and cooled to set before use.

• Incubation conditions (general):

  • Incubation temperature and time are determined by the governing method for coliform detection (e.g., commonly around 35–37 °C for total coliforms, duration typically 18–24 h). Verify the exact parameters per your SOP/standard method.

All numeric parameters are method- and formulation-dependent and are Not specified for this item; refer to CoA/Spec Sheet and validated laboratory procedures.

Safety and Handling

• Item-specific hazard data:

  • Signal Word: Not specified for this item; refer to SDS.
  • H-Statements: Not specified for this item; refer to SDS.
  • GHS Classification and Pictograms: Not specified for this item; refer to SDS.

• General safety guidance (literature/good laboratory practice):

  • Treat dehydrated culture media as laboratory chemicals. Avoid inhalation of dust and contact with skin/eyes. Use appropriate PPE: lab coat, safety glasses, and suitable gloves (e.g., nitrile). Handle powders in a well-ventilated area or fume hood to minimize dust exposure.
  • If the formulation contains dyes (e.g., basic fuchsin in some Endo media), prevent contact with skin and avoid aerosolization; dyes may stain and can be irritants.
  • First aid (general): Inhalation—move to fresh air; Skin—wash with soap and water; Eyes—rinse cautiously with water for several minutes; Ingestion—rinse mouth with water. Seek medical attention if symptoms persist. Always consult the SDS for authoritative instructions.
  • Incompatibilities (general): Strong oxidizers, strong acids/bases may degrade organic components and dyes. Store away from moisture and reactive chemicals.
  • Microbiological risk: After inoculation/incubation, plates and pads will contain live microorganisms; handle as biohazard according to institutional biosafety procedures and decontaminate (e.g., autoclave used plates) before disposal.

Always defer to the product’s SDS and local EHS requirements.

Solvent Selection

This product is a microbiological medium rather than an organic reagent; classical solvent selection is not applicable.

• Applicable guidance (general):

  • Reconstitution solvent: high-purity water (e.g., ASTM Type I/II water). Water quality impacts clarity, gel strength, and performance; avoid high chlorine, heavy metals, or residual disinfectants.
  • Optional additives are formulation/method-dependent (e.g., ethanol-decontaminated glassware only; do not introduce organic solvents that may inhibit growth).
  • For membrane filtration methods, prepared medium may be used to saturate sterile absorbent pads; ensure the wetting volume fully saturates pads without pooling.

• When to choose this medium vs alternatives (general):

  • Choose LES Endo-type media for selective/differential detection and enumeration of total coliforms via lactose fermentation indicators.
  • Consider other media (e.g., m-Endo, m-FC, MacConkey, VRBA) depending on target organism group, incubation temperature, and compliance with the specific standard method.

For exact reconstitution instructions and volumes, consult the product label/CoA.

Storage and Reconstitution

• Item-specific storage:

  • Storage Conditions: Room temperature.
  • Shipped In: Normal.

• Reconstitution guidance (general, literature for Endo-type media):

  • Use high-purity water. Gradually add dehydrated medium to water with stirring and gentle heat until fully dissolved. Avoid overheating to preserve indicator performance.
  • Sterilization and clarification steps are formulation-dependent; some Endo-type media are not autoclaved. Follow the product label/CoA.
  • For agar plates: dispense into sterile petri dishes at the recommended temperature; allow to set on a level surface. For membrane filtration, sterile absorbent pads can be saturated with the prepared medium.
  • Store prepared plates refrigerated and protected from light if the formulation contains light-sensitive dyes; use within the period validated by your laboratory (literature practice). Actual shelf-life is method- and formulation-dependent and Not specified for this item; refer to CoA/Spec Sheet.

• Freeze–thaw guidance:

  • Not applicable to dehydrated powder. Avoid moisture uptake; keep container tightly closed with desiccant as appropriate.

Research Use Note: For research use only.

Structure and Identity

This product is a complex, dehydrated microbiological culture medium formulated for selective/differential cultivation and enumeration of coliform bacteria.

• Item-specific identifiers:

  • SKU: L1528441
  • Product Name: LES Endo Agar (dehydrated culture medium)
  • Grade/Purity: BioReagent
  • CAS, InChIKey, SMILES, Molecular Formula, Molecular Weight: Not applicable for complex mixtures; Not specified for this item; refer to CoA/Spec Sheet.

• Structural features (general, literature):

  • LES Endo-type media are complex mixtures typically comprising peptones/tryptose (nitrogen sources), lactose (fermentable carbohydrate), selective agents, and indicator system components (e.g., sodium sulfite/basic fuchsin) that differentiate lactose-fermenting coliforms by characteristic colony morphology and sheen.
  • No single defined molecular structure—best considered as a formulated blend of organic and inorganic constituents.

• 2D structural description (general):

  • Not applicable; composition is a heterogeneous blend rather than a discrete molecule with a definable 2D structure.

• Category path: 全部 / 可售 / 生命科学

Notes: Because this is a formulated medium, classical molecular identifiers do not apply. For exact formulation and component list, consult the product CoA/Specification Sheet.

Synthetic Utility

Not applicable. LES Endo Agar is not a building block, reagent, or catalyst for chemical synthesis. It is a formulated medium for microbiological culture and differential enumeration. For chemical synthesis-related content, please refer instead to specific reagents or solvents relevant to your reaction type.

Target Specificity

Antibody/antigen specificity does not apply to this product.

• Microbiological selectivity (general, literature):
  • Endo-type media are designed to be selective/differential for lactose-fermenting coliform bacteria. The indicator system typically yields red colonies with a metallic sheen for lactose fermenters, while non-lactose fermenters remain colorless to pale.
  • Selective agents suppress many Gram-positive and some Gram-negative non-targets, increasing the likelihood of recovering target coliforms from mixed samples.

Item-specific selectivity data and performance criteria are Not specified for this item; refer to CoA/Spec Sheet and perform growth promotion testing as required.