Clostridial Differential Agar (DCA) - BioReagent

Cat. No.: C1528513

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Vue d’ensemble

For enumeration of sulfite-reducing Clostridium in dried foods

Specifications

Spécifications et pureté

BioReagent

Conditions de stockage de stockage

Room temperature

Expédié en

Normal

Grade

BioReagent

Product Line

Produits biologiques

Application Protocols

Item-specific tested applications are not provided. The following is general, literature-based guidance for using DCA-type media to culture clostridia. Adjust per your SOPs and the product’s label/CoA.

General plating workflow (literature/general):

• Preparation: Reconstitute and sterilize the medium as directed on the label. If required, add sterile supplements (e.g., egg yolk, selective antibiotics) to ~45–50 °C medium before pouring plates. Allow plates to solidify; pre-reduce in anaerobic conditions if cultivating strict anaerobes.
• Sample processing: For spore selection, optionally heat-shock samples (e.g., 70–80 °C, 10–15 min). Perform serial dilutions in anaerobically pre-reduced diluent.
• Inoculation: Spread or pour-plate appropriate dilutions. Include positive/negative control strains.
• Incubation: Place plates in anaerobic jars/pouches with indicator and catalyst or in an anaerobic chamber. Incubate at organism-appropriate temperature (often 30–37 °C) for 24–72 h.
• Reading results: Record colony counts and note differential reactions (e.g., opacity, haloing on egg-yolk–containing plates, color changes if indicators are present). Confirm presumptive colonies by microscopy, biochemical tests, MALDI-TOF, or molecular assays.
• QC: Perform growth promotion, inhibition, and sterility checks per ISO 11133 or internal SOPs using reference strains.

Diagnostics/clinical reporting is outside the scope of this product. For research use only (from Product Data).

Biological Roles

This section describes the biological context of organisms targeted by DCA, not properties of the medium as a chemical entity.

• Target organisms (general): Members of the genus Clostridium sensu lato—Gram-positive, spore-forming, obligately anaerobic rods. Many species are metabolically versatile saccharolytic or proteolytic fermenters producing organic acids, solvents, gases, and toxins (literature/general).
• Ecological roles: Ubiquitous in soils, sediments, intestinal tracts, and anaerobic digesters. Key players in biomass turnover (cellulose/hemicellulose degradation) and nitrogen/sulfur cycling.
• Metabolic pathways: Predominantly fermentative; pathways include ABE (acetone–butanol–ethanol) fermentation, acetogenesis via Wood–Ljungdahl pathway in some clostridia, and amino acid Stickland fermentation (literature/general).
• Sporulation: Endospore formation enables survival under adverse conditions and is exploited in lab protocols (e.g., heat-shock enrichment).
• Differential traits used in the lab: Lecithinase/lipase activity (egg yolk reactions), lactose/sucrose/glucose fermentation with pH indicators, colony morphology/hemolysis on enriched agar, and sensitivity to specific antibiotics (literature/general). DCA‑type media are formulated to reveal one or more of these traits.

Note: Identification of clostridia typically requires a combination of colony characteristics on selective/differential media plus confirmatory biochemical, MALDI-TOF MS, or molecular methods. DCA facilitates the first, presumptive step; definitive identification requires additional testing.

Buffer Applications

Not typically applicable. Clostridial Differential Agar (DCA) is a complex culture medium rather than a defined buffering agent. Any buffering capacity arises from intrinsic media components (e.g., phosphates, peptones) in the formulation. For dedicated buffer preparation, consult appropriate buffer concentrates or reagents.

Green Alternatives

DCA is a dehydrated medium reconstituted with water and sterilized by heat; classical “green solvent” substitutions are not directly relevant. Sustainability considerations for microbiological media focus on water/energy use, waste, and packaging.

Greener practice suggestions (literature/general):

• Energy optimization: Use validated autoclave cycles sized to load; avoid oversterilization. Consider pre-melting only the volume needed.
• Water stewardship: Prepare only the volume required to minimize expired-plate disposal; use reclaimed non-potable water solely for cleanup (not for media prep).
• Waste reduction: Choose reusable glassware where permitted; segregate biohazard waste to minimize incineration volume. Use stackable plate formats to reduce packaging.
• Alternatives/adjacent media: For broader anaerobe recovery with potentially fewer selective antibiotics, Reinforced Clostridial Agar/Broth can reduce reliance on antimicrobial additives. For targeted detection that may shorten incubation, chromogenic formulations can reduce repeat testing—but may have higher dye footprints. Balance selectivity, sensitivity, and environmental impact.

Comparison snapshot (general):

• DCA: Differential/selective for clostridia; may require antibiotic/supplement additions; standard heat sterilization.
• Non-selective anaerobe media: Higher recovery breadth; less chemical selectivity; more confirmatory testing needed.

Item-specific eco attributes (e.g., recyclable packaging, concentrated format): Not specified for this item; refer to product literature.

Pharmaceutical Uses

No therapeutic or clinical claims are made for this product. For research use only (from Product Data).

Relevant roles in pharmaceutical/biotech laboratories (literature/general):

• Environmental monitoring and in-process control: Detection and presumptive differentiation of anaerobic spore-formers in facilities handling raw materials prone to anaerobe contamination.
• QC microbiology: Suitability testing of anaerobic growth and assessment of sanitation procedures using clostridial indicators.
• Process development/fermentation R&D: Isolation and maintenance of clostridial strains used in anaerobic bioprocess studies (e.g., solventogenic or acetogenic clostridia).
• Raw material/utility testing: Evaluation of water systems or excipients for presence of anaerobic spore-formers, where applicable protocols permit.

Standards and compliance:

• This listing does not assert compliance with pharmacopeial monographs or ISO 11133. If use in regulated workflows is intended, verify media performance (growth promotion testing), sterility, and documentation requirements for your quality system with the lot-specific CoA/Spec Sheet.

Packaging, sterility, and supplements:

• Supplied as dehydrated medium (sterilization by the user). Specific supplement requirements and GPT organisms are Not specified for this item; consult CoA/Spec Sheet.

Physical Properties

Item-specific physico-chemical specifications have not been provided for this catalog entry. Where applicable, consult the CoA/Spec Sheet for batch-resolved details.

• Appearance: Not specified for this item; refer to CoA/Spec Sheet.
• pH (prepared medium): Not specified for this item; refer to CoA/Spec Sheet.
• Moisture content: Not specified for this item; refer to CoA/Spec Sheet.
• Solubility: Dehydrated medium is intended to disperse/hydrate in purified water; exact dissolution behavior depends on formulation (item-specific not provided).
• Storage conditions (from Product Data): Room temperature; protect from moisture.

Typical characteristics for dehydrated agar media (literature/general):

• Physical form: Free-flowing, hygroscopic powder or granules; color ranges from off‑white to light tan depending on components.
• Density/bulk density: Variable by blend; commonly 0.4–0.8 g/mL (approximate, literature; not a specification).
• Refractive index, logP, pKa, BP/MP: Not meaningful for complex, heterogeneous mixtures.
• Solvent for preparation: High‑purity water (ASTM Type 1 or 2) to the labeled mass-per-volume; heating/boiling usually required to fully dissolve agar. Autoclaving is commonly used to sterilize (literature/general).

Important: Treat any numerical property requirements (e.g., grams per liter, final pH at 25 °C) as label-specific; do not infer performance specifications from the above general notes.

Quality and Grades

• Item-specific grade: BioReagent (from Product Data).
  • BioReagent grade indicates suitability for laboratory biological applications such as microbiological culture and routine research workflows. It emphasizes consistent performance and low bioburden of the dehydrated medium components but is not equivalent to clinical/diagnostic or cGMP release unless explicitly stated on documentation.

What this means in practice:

• Raw materials are selected for reproducible growth characteristics and differential/selective performance when prepared per label (general statement of the grade; item-specific performance parameters are Not specified for this item; refer to CoA/Spec Sheet.).
• Batch documentation typically includes pH of the prepared medium, growth promotion testing (GPT) against representative organisms, and sterility checks (literature/general for culture media QC). Confirm specifics on the CoA for this SKU.

Stabilizers/additives:

• Not specified for this item; refer to CoA/Spec Sheet.

Regulatory/standards context (general):

• BioReagent grade products are intended for research use only. Where pharmacopoeial conformity (e.g., USP/EP/JP) or ISO 11133 validation is required for food/water/environmental testing, verify applicability with batch documentation—this listing does not assert such compliance.

Recommendation:

• For critical assays, request recent CoA with GPT results for the relevant Clostridium species/strains and verify water quality and sterilization parameters to ensure lot-to-lot reproducibility.

Reaction and Applications

This product is a microbiological culture medium rather than a chemical reagent for synthetic reactions. Accordingly, “reactions” are not applicable. The relevant “applications” concern microbial cultivation and differentiation.

Applications (literature/general for DCA-type media):

• Selective/differential isolation and enumeration of Clostridium spp. from clinical, food, environmental, and industrial samples under anaerobic incubation.
• Presumptive differentiation based on colony morphology, lecithinase/lipase/fermentation reactions, and indicator dye/color changes when appropriate supplements are included.
• Quality control of anaerobic processes, fermentation lines, and microbiome studies focusing on spore-forming Gram-positive rods.

Practical tips:

• Sample processing: Heat shock (e.g., 70–80 °C for 10–15 min; literature/general) may be used to select for spores when enumerating clostridia.
• Anaerobiosis: Pour plates and dry under anaerobic conditions where possible; use anaerobic jars/pouches with catalysts or an anaerobic chamber. Pre-reduce plates by storing them anaerobically for several hours before inoculation to enhance recovery of strict anaerobes (literature/general).
• Supplements: Some DCA protocols incorporate egg yolk emulsion and/or specific antibiotics to enhance selectivity/differentiation; add sterile supplements aseptically after autoclaving and cooling to ~45–50 °C (literature/general). Exact supplements for this SKU are Not specified.

Always validate with positive/negative control strains and consult the CoA/Spec Sheet for any item-specific preparation or GPT performance notes.

Reaction Conditions

In lieu of chemical reaction conditions, this section provides general preparation and incubation conditions for DCA-type media (literature/general). Item-specific parameters (mass per liter, target pH, supplements) are Not specified for this item and must be obtained from the product label/CoA.

• Reconstitution: Suspend the labeled mass of dehydrated medium in purified water with gentle stirring. Heat to dissolve; agar requires near-boiling to fully melt. Avoid overheating that can degrade sugars/indicators.
• Sterilization: Autoclave using an appropriate cycle (e.g., 121 °C for 15–20 min; literature/general). Do not autoclave heat-labile supplements; instead, aseptically add sterile-filtered supplements to the medium cooled to ~45–50 °C before pouring plates.
• Anaerobic preparation: For strict anaerobes, pre-reduce media by placing sterilized, solidified plates in an anaerobic environment (e.g., jars with catalysts or an anaerobic chamber) for several hours prior to inoculation.
• Incubation: Inoculate and incubate plates under anaerobic conditions at temperatures appropriate for the target species (commonly 30–37 °C; literature/general) for 24–48 h or longer, monitoring for characteristic colony morphology and differential reactions.
• Controls: Include positive control clostridial strains and negative (aerobic or non-clostridial) strains to verify selectivity/differentiation.

Note: Times, temperatures, and supplement types/concentrations are protocol- and organism-dependent. Always validate settings with your strains and consult institutional SOPs.

Safety and Handling

Hazard classification data were not provided for this item. Always consult the product SDS for authoritative safety information.

• GHS classification, signal word, pictograms, H-statements: Not specified for this item; refer to SDS.
• Anticipated hazards (general for dehydrated culture media):
  • Low acute toxicity; dust may cause mechanical eye irritation or respiratory tract discomfort. Some selective agents in DCA-type media (e.g., bile salts, antibiotics) can be irritants—handle powders to minimize dust (literature/general).
• Recommended PPE: Lab coat, safety glasses, nitrile gloves; use a dust mask/respirator if generating airborne particulates. Work in a clean area to avoid contamination.
• Handling guidance:
  • Avoid inhalation of dust; prevent moisture uptake (media are hygroscopic).
  • Prepare under good microbiological practice (GMP/GLP/BSL as appropriate). DCA is used for cultivating anaerobic clostridia; once inoculated, plates/broths should be handled as potentially biohazardous.
• Incompatibilities (general): Store away from strong oxidizers and moisture. Do not mix dry powders with acids/bases outside standard media preparation procedures.
• First-aid (general): If inhaled, move to fresh air; if eye contact, rinse cautiously with water; if skin contact, wash with soap and water. Seek medical attention if irritation persists. Spill response: Avoid dust, sweep gently, and dispose according to local regulations.
• Biosafety note: Cultures of Clostridium spp. may require BSL-2 practices; consult your institutional biosafety guidelines and organism risk assessments.

Solvent Selection

As a dehydrated microbiological medium, DCA is reconstituted in water; organic solvent selection is not applicable.

• Primary solvent: High-purity water (ASTM Type 1–2 or equivalent). Avoid deionizers that leach organics or residual sanitizers.
• Water quality considerations (literature/general):
  • Resistivity ≥ 10 MΩ·cm, TOC < 500 ppb for critical media prep to minimize inhibitory contaminants.
  • Low levels of chlorine/chloramine, heavy metals, and chelators; avoid phosphate carryover if the medium’s buffering relies on non-phosphate systems.
• Miscibility: Agar-based media do not dissolve in organic solvents; agar requires heating to near-boiling in water for full hydration before sterilization.
• When to choose DCA vs alternatives:
  • Choose DCA for selective/differential recovery and presumptive differentiation of Clostridium spp. under anaerobic conditions (literature/general). For broad anaerobe recovery, consider non-differential anaerobe agars (e.g., Reinforced Clostridial Medium/Agar) or targeted media (e.g., CCFA for C. difficile), as appropriate to your organism and application.

Note: Exact reconstitution mass-per-liter and pH targets are Not specified for this item; refer to CoA/Spec Sheet/label.

Storage and Reconstitution

• Storage (from Product Data): Room temperature. Keep container tightly closed in a dry place. Protect from moisture and light. Avoid long-term exposure to high humidity; media are hygroscopic.
• Shipping (from Product Data): Shipped at ambient temperature (Normal).

Reconstitution and sterilization (literature/general):

• Reconstitution mass-per-liter, final pH, and any supplement requirements: Not specified for this item; refer to the product label/CoA/Spec Sheet.
• Water quality: Use freshly produced, high-purity water (ASTM Type 1–2). Avoid CO2 absorption during preparation that can alter pH.
• Dissolution: Add dehydrated medium gradually to cold/room-temperature water with stirring; heat to near-boiling to dissolve agar fully. Do not overboil.
• Sterilization: Autoclave using a validated cycle (e.g., 121 °C, 15–20 min; literature/general). Cool to ~45–50 °C before adding sterile, heat-labile supplements and pouring plates.
• Anaerobic handling: Where strict anaerobiosis is required, pre-reduce plates by holding under anaerobic conditions prior to use. Store finished plates at 2–8 °C, protected from drying and light; allow to warm and equilibrate anaerobically before inoculation (literature/general).
• Freeze–thaw guidance: Not applicable to dehydrated media. Avoid freezing the dry powder to prevent condensation on thaw.

Shelf life and specific preparation instructions are batch- and formulation-dependent; consult the CoA/Spec Sheet.

Structure and Identity

Clostridial Differential Agar (DCA) is a complex, multi‑component dehydrated culture medium designed for the selective/differential cultivation of Clostridium spp. It is not a single chemical substance.

• Item-specific identifiers:
  • CAS: Not specified for this item; refer to CoA/Spec Sheet.
  • Molecular formula: Not applicable to complex media; individual components vary.
  • Molecular weight: Not applicable to complex media; mixture.
  • InChIKey / SMILES: Not applicable for mixtures.
• Composition nature (general, literature):
  • Typically comprises a peptone/protein hydrolysate base, yeast/animal extracts, carbohydrates and/or selective agents, buffers, salts, and an agar gelling matrix. Some DCA formulations may be supplemented with egg yolk emulsion and/or antibiotics to differentiate clostridia and suppress aerobes (literature/general).
• Structural features (descriptive):
  • Heterogeneous solid blend of low– to high–molecular weight organic and inorganic constituents embedded within agar. No discrete 2D molecular structure can represent the product as supplied.

Notes:

• This is supplied for microbiological culture applications, not as a defined chemical entity. For exact component list, concentrations, and preparation instructions, consult the product label and CoA/Spec Sheet (item-specific details not provided here).

Synthetic Utility

Not applicable. Clostridial Differential Agar (DCA) is a biological culture medium and is not used as a building block, reagent, or catalyst in chemical synthesis. For chemical applications, refer instead to dedicated reagents and solvents appropriate to the transformation of interest.

Target Specificity

This section is generally applicable to antibodies or affinity reagents and does not apply to culture media. DCA does not possess antigen/epitope specificity. Its “specificity” is functional—providing selective/differential growth conditions favoring Clostridium spp. while inhibiting competing flora (literature/general). No clone/isotype/species reactivity data apply.