KF Streptococcus Agar Medium (KF Medium Base) - BioReagent

Cat. No.: K1528468

QUALITÉ & PURETÉ BioReagent

Storage

Room temperature

Shipped In

Normal

Vue d’ensemble

Contains TTC, for membrane filtration enumeration and testing of enterococci and streptococci

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 protocol for preparing and using KF Streptococcus Agar from a dehydrated KF Medium Base; adapt to your institutional SOPs. Item-specific details (e.g., grams per liter, supplements) — Not specified; refer to CoA/Spec Sheet.

A. Plate Preparation (literature)

1. Weigh the manufacturer-recommended amount of KF Medium Base into a suitable flask. Add the specified volume of purified water.
2. Heat with stirring to dissolve completely. Avoid scorching.
3. Autoclave at 121 °C for the recommended time (commonly ~15 min). Do not autoclave heat-labile supplements.
4. Cool to 45–50 °C in a water bath. Aseptically add sterile-filtered supplements (e.g., TTC solution and any specified selective agents) at the recommended concentrations.
5. Mix gently without aeration; pour into sterile Petri dishes. Allow to solidify and dry plates to remove surface moisture.

B. Sample Inoculation and Incubation (literature)

1. For water: filter the sample through a 0.45 µm membrane; place the membrane on the agar surface (avoiding bubbles). For food/environmental swabs: spread appropriate dilutions on plate surfaces.
2. Invert and incubate plates typically at 35–37 °C for 24–48 h.
3. Examine for characteristic target colonies (e.g., red/pink from TTC reduction) and enumerate. Perform confirmatory tests as required by your method.

C. Quality Control (literature)

• Include positive-control strains (e.g., Enterococcus faecalis) and negative controls per lab SOP to verify selectivity and recovery.

Research Use Only: per Product Data.

Biological Roles

This product supports the growth and differentiation of specific bacteria in vitro; it does not have inherent biological activity in vivo.

• Functional role (literature): provides peptidic nitrogen, vitamins, carbohydrates, minerals, and selective agents to favor fecal streptococci/enterococci while suppressing competing flora. Redox/indicator systems (e.g., TTC) facilitate visual recognition of target colonies via color development upon metabolic reduction.
• Target organisms (literature): Enterococcus spp. (formerly Group D streptococci), including E. faecalis and E. faecium, which are commonly used as fecal contamination indicators in water quality and food hygiene assessments.
• Mechanistic basis of selectivity (literature): azide inhibition of cytochrome oxidase-containing bacteria; tolerance by enterococci; carbohydrate utilization leading to acid production; indicator reduction marking metabolically active colonies.
• Downstream analysis: colonies recovered on KF media are typically subjected to confirmatory biochemical or molecular identification to ensure specificity and to enumerate compliant results per method standards.

No medical or clinical claims are made. For research and laboratory monitoring use only (per Product Data).

Buffer Applications

Not a buffering reagent. Conventional buffer preparation (pH control for biochemical assays) is not the intended use.

• Practical note (literature): The prepared medium has a defined pH range set by its formulation; users should not arbitrarily adjust pH, as this can alter selectivity and performance. For pH details and tolerances for this item — Not specified; refer to CoA/Spec Sheet.

Green Alternatives

While “green chemistry” typically concerns solvent/process choices, environmental aspects also apply to microbiological media:

• Potential environmental concerns (literature): many KF formulations incorporate sodium azide (toxic; forms explosive heavy-metal azides in plumbing) and TTC (toxic to aquatic life). Waste solutions/plates may require hazardous chemical and biohazard management.
• Greener practice suggestions (literature, not item-specific):
  • Minimize azide-containing effluents; never discharge to copper/lead drains; collect azide-containing liquids for hazardous waste disposal.
  • Use membrane filtration methods that reduce overall medium use per sample.
  • Evaluate alternative selective media with reduced or no azide where validated for your application (e.g., Slanetz–Bartley agar, m-Enterococcus agar), balancing selectivity, regulatory acceptance, and waste profile.
  • Optimize batch sizes to limit expired or unused plates.

Comparison snapshot (literature, qualitative):

• KF Medium: strong selectivity (often via azide), well-established in environmental monitoring; potential chemical hazard burden if azide/TTC are used.
• Slanetz–Bartley: selective for enterococci with different inhibitors/dyes; may offer improved differentiation in some matrices; check regulatory method compatibility.
• m-Enterococcus: widely used in water testing; different indicator system; may reduce certain chemical hazards depending on formulation.

Always confirm method acceptance by your accreditation body before switching media.

Pharmaceutical Uses

This product is a research-grade microbiological medium. It is not an excipient and is not intended for use in pharmaceutical formulations or clinical diagnostics.

• Potential lab roles within pharma R&D/QA (literature, not item-specific):
  • Environmental monitoring and hygiene investigations where enterococci are tracked as indicators in non-sterile manufacturing environments.
  • Method development/validation of microbial enumeration or challenge studies for raw materials (outside compendial tests, unless specifically validated).

Regulatory/compendial status, if any — Not specified for this item; refer to CoA/Spec Sheet and governing methods if used in regulated contexts.

Physical Properties

As a dehydrated medium, physical constants of a single compound do not apply. Practical properties relevant to handling are summarized below.

• Physical state/appearance (dehydrated base): Not specified for this item; refer to CoA/Spec Sheet. (Literature: typically a free-flowing beige to tan powder.)
• Solubility: Designed to dissolve/disperse in purified water during medium preparation (literature). Complete dissolution usually requires heating.
• pH of prepared medium: Not specified for this item; refer to CoA/Spec Sheet. (Literature: KF media are commonly adjusted to a near-neutral pH; exact target and tolerance are manufacturer-defined.)
• Gelation: Solidifies upon cooling when agar is present at the specified concentration (literature); gel strength and clarity depend on formulation.
• Density, refractive index, logP, boiling point, melting point — Not applicable to complex dehydrated blends; Not specified for this item; refer to CoA/Spec Sheet.
• Hygroscopicity: Many dehydrated media are moderately hygroscopic (literature); protect from moisture to prevent clumping and performance drift.
• Typical preparation temperature profile (literature): suspend in water, heat to dissolve; sterilize by autoclaving (e.g., 121 °C); cool to 45–50 °C prior to aseptic addition of heat-labile supplements.

Quality and Grades

• Item-specific grade: BioReagent (per Product Data). BioReagent denotes suitability for general laboratory and life-science workflows where consistent performance and low bioburden are important, but it is not a clinical/diagnostic grade unless stated.
• What this means in practice:
  • Manufactured to support reproducible microbial growth characteristics (e.g., selective recovery of target organisms and inhibition of background flora) when prepared as directed.
  • Typical quality controls for dehydrated media (literature): appearance, moisture content, pH of prepared medium, gel strength/clarity, and growth performance tests with defined challenge strains. Exact QC acceptance criteria — Not specified for this item; refer to CoA/Spec Sheet.
• Stabilizers/preservatives: Not specified for this item; refer to CoA/Spec Sheet.
• Endotoxin/bioburden or metals limits: Not specified for this item; refer to CoA/Spec Sheet.
• Suitability: For research use only (per Product Data). Not intended for human or animal diagnostic or therapeutic use.
• Documentation: For lot-specific preparation guidance and performance specifications, consult the CoA/Spec Sheet supplied with the product.

Reaction and Applications

Chemical reaction use is not applicable. Instead, KF Streptococcus Agar Medium (KF Medium Base) is used in microbiology workflows:

• Intended application (literature): selective isolation and enumeration of fecal streptococci/enterococci from water, food, and environmental samples, leveraging inhibitors and redox indicators to differentiate target colonies.
• Typical workflow elements (literature, not item-specific):
  • Sample processing: membrane filtration of water samples or direct spread/spiral plating of homogenized food/environmental samples onto prepared KF agar plates.
  • Selectivity: inhibitory components (often sodium azide) suppress Gram-negative and many Gram-positive non-targets; carbohydrate/indicator system differentiates enterococci by color due to TTC reduction.
  • Confirmation: presumptive colonies are commonly confirmed by Gram stain, catalase test, esculin hydrolysis, or additional biochemical/ molecular assays.
• Practical tips (literature):
  • Thoroughly dissolve the base before sterilization to ensure even gel and nutrient distribution.
  • Add heat-labile supplements aseptically to medium cooled to ~45–50 °C, then pour plates promptly to avoid stratification of indicators.
  • Dry plates before use to minimize colony spread and confluent growth.
• Note: Exact preparation instructions, supplement types/amounts, and incubation parameters for this item — Not specified; refer to CoA/Spec Sheet.

Reaction Conditions

Chemical reaction conditions are not applicable. Instead, microbiological incubation parameters are relevant (literature, not item-specific):

• Medium preparation (general): dissolve the manufacturer-recommended grams per liter of dehydrated base in purified water with heating; sterilize by autoclaving. If heat-labile supplements (e.g., TTC, selective agents) are required, sterilize them by filtration and add aseptically to the cooled (≈45–50 °C) sterile base before pouring plates.
• Incubation of plates: typically 35–37 °C for 24–48 hours; some methods specify incubation up to 48 hours to recover stressed organisms. Atmosphere: aerobic; humidity control helps prevent plate desiccation.
• Sample handling: for water testing, membrane filtration (e.g., 0.45 µm) followed by placement of the membrane onto the agar surface is common; for food, direct spread-plating or pour-plating of dilutions may be used.
• Expected outcomes (qualitative): target enterococcal colonies develop characteristic coloration due to indicator reduction and may be surrounded by zones indicating carbohydrate fermentation; background flora is inhibited.

Exact conditions, supplement requirements, and acceptance criteria for this item — Not specified; refer to CoA/Spec Sheet and your governing standard method (e.g., local regulations, ISO, or EPA methods).

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, not item-specific): KF-type streptococcal selective media frequently include or are supplemented with sodium azide (to inhibit Gram-negative flora) and TTC as a redox indicator. If present, azide-containing powders/solutions are acutely toxic and must not contact heavy metals due to formation of explosive metal azides in plumbing; TTC can be harmful if ingested or inhaled. Handle all selective media as potentially hazardous.
• Primary routes of exposure: inhalation of dust, skin/eye contact, ingestion. Avoid generating dust/aerosols.
• Recommended PPE: laboratory coat, safety glasses, appropriate chemical-resistant gloves (e.g., nitrile). Use a dust mask/respirator if dusts cannot be controlled; consult SDS for selection.
• Engineering controls: handle powders in a fume hood or ventilated weighing enclosure; use closed containers to limit airborne dust and moisture uptake.
• Incompatibilities (literature): strong oxidizers; if azide is present, avoid contact with copper/lead/brass/plumbing and strong acids.
• First aid (overview; see SDS for details):
  • Inhalation: move to fresh air; seek medical attention if symptoms persist.
  • Skin: wash with soap and water; remove contaminated clothing.
  • Eyes: rinse cautiously with water for several minutes; remove contact lenses if easy.
  • Ingestion: rinse mouth; do not induce vomiting; seek medical advice.
• Microbiological hygiene: Treat all used plates/broths and materials contacting cultures as biohazardous; autoclave before disposal. Follow institutional biosafety procedures.

Solvent Selection

This product is a dehydrated microbiological medium intended to be dissolved/dispersed in purified water for preparation of plates or broths. Conventional solvent-selection guidance for small-molecule chemistry does not apply.

• Working solvent: high-purity water (e.g., distilled, deionized). If supplements are heat-labile (literature: TTC, selective agents), add as sterile-filtered aqueous solutions to the cooled, sterilized base.
• Water quality (literature): use Type II/III deionized water for routine microbiology; avoid high ionic load or residual chlorine that can inhibit growth or alter selectivity.
• Alternatives: Not applicable — medium composition is fixed. For different selectivity or performance, consider alternative formulated media (see Green Alternatives) rather than changing solvent.

Storage and Reconstitution

• Storage conditions (dehydrated medium): Room temperature (per Product Data). Keep container tightly closed in a cool, dry place; protect from moisture, heat, and light. Avoid prolonged exposure to humid air to prevent clumping and performance drift.
• Shipping: Shipped at ambient conditions (per Product Data: Normal).
• Reconstitution/preparation: Dissolve the manufacturer-recommended quantity in purified water with heating; sterilize by autoclaving. Add heat-labile supplements aseptically to cooled (≈45–50 °C) sterile medium before pouring plates (literature; not item-specific). Exact preparation parameters — Not specified for this item; refer to CoA/Spec Sheet.
• Prepared plates: Store inverted at 2–8 °C in sealed sleeves or containers to limit dehydration; allow plates to equilibrate to room temperature before use. Recommended shelf life of prepared plates — Not specified for this item; follow institutional SOPs.
• Freeze–thaw: Do not freeze dehydrated medium or poured agar plates; freezing damages performance and gel structure.
• Research Use Only: For research use only (per Product Data).

Structure and Identity

KF Streptococcus Agar Medium (KF Medium Base) is a dehydrated, complex microbiological medium formulated for selective cultivation and enumeration of fecal streptococci/enterococci. It is a mixture, not a single defined chemical entity.

• SKU: K1528468; Product Name: KF Streptococcus Agar Medium (KF Medium Base)
• Type: Complex dehydrated culture medium (mixture)
• Chemical identifiers for a single molecule (Molecular Formula, MW, SMILES, InChIKey) — Not applicable to complex media.
• Grade: BioReagent (per Product Data)
• Structural features (descriptive):
  • Expected constituents (literature, not item-specific): peptones/tryptone, yeast extract, carbohydrate sources, selective agents (often sodium azide), indicator/reducing dye system (commonly TTC added as a supplement), buffers/salts, and agar as gelling agent when prepared as plates. Exact composition and concentrations vary by manufacturer and lot.
  • 2D “structure” cannot be represented because the product is a heterogeneous blend of multiple components.
• Identity confirmation: For this item, identity is established by label, catalog number, and CoA/Spec Sheet including pH of prepared medium and growth performance tests (manufacturer-specific). Specific identity test results — Not specified for this item; refer to CoA/Spec Sheet.

Synthetic Utility

Not applicable. KF Streptococcus Agar Medium (KF Medium Base) is not a synthetic building block or reagent for chemical synthesis.

• Guidance: For applications, see Biological Roles and Application Protocols sections, which cover its use in microbiological cultivation and enumeration.

Target Specificity

This section is primarily for antibodies and affinity reagents; it does not directly apply to microbiological media.

• Context (literature): KF-type media are designed to be selective for fecal streptococci/enterococci, inhibiting many non-target organisms through specific inhibitors and enabling recognition with indicator systems. Organism-level specificity must be confirmed using appropriate biochemical or molecular tests.

Item-specific claims of specificity — Not specified for this item; refer to CoA/Spec Sheet and method performance data.