Czapek-Dox Medium - BioReagent

Cat. No.: C1528277

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Vue d’ensemble

For isolation and differentiation of Penicillium and Aspergillus

Specifications

Spécifications et pureté

BioReagent

Conditions de stockage de stockage

Room temperature

Expédié en

Normal

Grade

BioReagent

Product Line

biological_products

Application Protocols

No item-specific, tested application protocols are provided in the Product Data. Preparation and use should follow your laboratory’s validated SOPs for Czapek-Dox Medium.

• For detailed, product-specific directions (mass-per-liter, pH, sterilization conditions, growth-promotion criteria), refer to the CoA/Spec Sheet accompanying SKU C1528277.

• General literature practices for medium preparation and incubation are summarized under Reaction Conditions; adapt to your organism and assay requirements.

Biological Roles

Czapek-Dox Medium provides defined nutrients to support the growth and differentiation of fungi and certain bacteria capable of nitrate assimilation.

• Nutritional framework (general, literature):

  • Carbon: Typically supplied by sucrose in classical recipes, supporting central metabolism (glycolysis, TCA) and biosynthesis of cell wall polysaccharides.
  • Nitrogen: Inorganic nitrogen (classically sodium nitrate) relies on organismal nitrate transport and reduction (nitrate → nitrite → ammonium), allowing studies of nitrogen regulation (AreA-mediated pathways in Aspergillus, literature).
  • Phosphorus and sulfur: Provided by phosphate and sulfate salts to support nucleic acid and cofactor synthesis; trace iron supports redox enzymes.

• Physiological outcomes:

  • Encourages robust mycelial growth and sporulation in molds like Aspergillus and Penicillium under appropriate C/N ratios and aeration.
  • Because it is defined, it is suitable for dissecting the effects of single nutrients on secondary metabolite biosynthesis (e.g., organic acids) without confounding peptides/amino acids from complex peptones.

• Selectivity aspects:

  • The use of nitrate selects for organisms with active nitrate assimilation pathways and can suppress some fastidious fungi/bacteria dependent on reduced nitrogen sources.

Note: The above describes general biological roles of Czapek-Dox formulations. Exact composition and performance characteristics for this specific item are Not specified for this item; refer to CoA/Spec Sheet.

Buffer Applications

Czapek-Dox Medium is not a dedicated buffering system; it is a growth medium. While phosphate salts in typical Czapek-Dox formulations impart limited buffering capacity near neutral pH (literature), the product is not intended for precise pH control like analytical buffers.

• If stringent pH control is required during cultivation:

  • Adjust the medium pH before sterilization and/or supplement with an appropriate biological buffer (e.g., MOPS, HEPES) validated for your organism, added aseptically after sterilization. Confirm compatibility with your strain and experimental goals.

• For buffering applications unrelated to cultivation: choose a true buffer system with a defined pKa and capacity; this product is not typically used for standalone buffer preparation.

Green Alternatives

Czapek-Dox Medium itself is an aqueous, sugar-and-salt-based formulation and generally aligns with green chemistry principles for laboratory media. Nevertheless, medium selection can influence environmental footprint and waste.

• Comparative considerations (general, literature):

  • Defined vs complex media: Czapek-Dox is chemically defined, enabling reduced variability and potentially less repeat experimentation (resource savings) compared with complex media like potato dextrose agar (PDA) or Sabouraud dextrose agar (SDA), which use animal/plant-derived peptones.
  • Carbon source: Sucrose-based formulations leverage widely available agricultural feedstocks; using certified sustainably sourced sugars may further reduce impact.
  • Waste minimization: Defined media tend to produce clearer Broths with fewer organic macromolecules, which can simplify downstream sterilization and disposal.

• Tradeoffs:

  • Some fungi grow faster on rich, complex media (e.g., PDA/SDA), potentially shortening incubation and reducing energy use. However, complex media introduce variability and animal-derived components (SDA), which some labs avoid.
  • Autoclave energy consumption is the dominant environmental factor; batching preparations and using validated shorter cycles where permissible can lower energy usage.

• Practical “greener” tips:

  • Prepare only volumes needed; store dry medium at room temperature in airtight containers to avoid waste from caking.
  • Sterilize by filtration for small volumes when feasible to reduce autoclave use (if the formulation and sterility requirements permit; filtration does not remove spores present in undissolved particulates).

Pharmaceutical Uses

No therapeutic or clinical use is implied. For research and laboratory quality-control use only (per Product Data).

• Typical roles in pharma/biotech laboratories (general, literature):

  • Environmental monitoring and mycological bioburden assessments where defined media are preferred for enumerating saprophytic molds from surfaces or air samples.
  • Strain maintenance and phenotypic assays for fungal production strains (e.g., Aspergillus) in early-stage process development, where a defined baseline medium facilitates comparison across process variables.
  • Screening for enzyme secretion or metabolite production under defined C/N regimes, aiding strain selection.

• Standards and compendia:

  • Specific pharmacopeial monographs for Czapek-Dox may not be universal, and none are specified for this item. Laboratories should validate the medium for intended QC assays per USP/EP/JP or internal SOPs.

• Formulation components:

  • Animal-origin–free by design when prepared with mineral salts and plant-derived carbohydrate, supporting AOxF policies. Confirm with the CoA for this item if AOxF status is required.

Note: Exact performance claims, growth-promotion testing organisms, and regulatory status are Not specified for this item; refer to CoA/Spec Sheet and your quality unit.

Physical Properties

Because Czapek-Dox Medium is a blended dry medium, many single-compound physical constants do not apply.

• Item-specific properties (from Product Data):

  • Appearance: Not specified for this item; refer to CoA/Spec Sheet.
  • Storage Conditions: Room temperature
  • Shipped In: Normal

• General physical characteristics (literature; not item-specific):

  • Physical form: Free-flowing, hygroscopic powder mixture; dissolves readily in water.
  • Solubility: Water-soluble to form a clear solution prior to sterilization (cloudiness can arise if hard water or precipitation occurs on heating).
  • pH (prepared medium): Commonly reported near neutral to slightly alkaline before sterilization (e.g., ~7.0–7.3 at 25 °C, literature). Actual pH depends on exact formulation and water quality.
  • Preparation strength: Often used at 1× strength; agar (≈15 g/L, literature) can be added for solid medium.

• Handling notes (general):

  • Hygroscopic components can cake on exposure to moisture; keep container tightly closed.
  • Dissolution is typically endothermic; warm water and vigorous stirring aid complete dissolution.

• Specifications not provided for this item (do not assume):

  • Exact pH, osmolality, conductivity, and any supplements or indicators are Not specified for this item; refer to CoA/Spec Sheet.

Quality and Grades

• Item-specific grade (from Product Data):

  • Grade/Purity: BioReagent

• What BioReagent typically implies (general):

  • Suitable for laboratory biological research and microbial culture work, emphasizing consistency and low bioburden. BioReagent media generally target reproducible growth performance and controlled background for downstream analyses.
  • Not manufactured or released under cGMP for human or veterinary use; intended strictly for research and quality-control laboratories.

• Performance considerations for Czapek-Dox (general, literature):

  • As a chemically defined medium, lot-to-lot reproducibility is aided by using specification-controlled salts and carbohydrate sources with low heavy-metal and organic impurity background.
  • pH and ionic strength of the reconstituted medium strongly affect growth and sporulation of filamentous fungi; rigorous lot release typically monitors growth promotion with representative strains (e.g., Aspergillus niger), though specific test organisms for this item are Not specified for this item; refer to CoA/Spec Sheet.

• Stabilizers/additives:

  • No stabilizers or indicators are specified for this item; refer to CoA/Spec Sheet if dyes (e.g., bromothymol blue) or supplements are included in a specific catalog variant.

• Documentation:

  • For exact formulation, microbial limits, growth-promotion testing, and QC release criteria for SKU C1528277, consult the Certificate of Analysis/Specification Sheet.

Reaction and Applications

As a microbiological medium, Czapek-Dox is used for cultivation rather than chemical synthesis. Key laboratory applications (general, literature) include:

• Isolation and maintenance of filamentous fungi able to assimilate nitrate, notably Aspergillus and Penicillium species. The defined composition facilitates comparative physiology and taxonomy studies.
• Sporulation and morphological differentiation: Controlled carbon/nitrogen ratios and inorganic nitrogen (often sodium nitrate) favor characteristic conidiation patterns in many molds.
• Metabolic and regulatory studies: Because the medium is defined, it supports investigations of nitrate assimilation pathways (nitrate/nitrite reductases), carbon catabolite repression, and secondary metabolite expression under defined C/N conditions.
• Screening and selection: Commonly used to assess enzyme secretion (e.g., amylases, cellulases with overlays), organic acid production, and tolerance to salts or xenobiotics by supplementing the base medium.
• Environmental mycology and QC: Recovery/enumeration of saprophytic fungi from soils, food/feed, and air samples; defined composition reduces batch variability compared with complex media.

Practical tips (general):

• Use high-purity water; dissolve completely before sterilization to avoid salt precipitation. Adjust pH as required for the organism under study prior to autoclaving (literature often near neutral).
• For plates, add agar (literature ~15 g/L) and pour at ~50–55 °C to minimize condensation. For heat-labile supplements, add aseptically after cooling.
• Incubate at organism-appropriate temperatures (many molds 25–30 °C, literature).

Reaction Conditions

For this product, “reaction conditions” correspond to culture preparation and incubation parameters rather than chemical reaction setups.

• Preparation (general, literature; not item-specific):

  • Dissolve the specified mass of Czapek-Dox Medium per liter of purified water (exact grams per liter for this item are Not specified for this item; refer to CoA/Spec Sheet). Heat and stir to clarify. Adjust pH as needed (literature often near neutral). Distribute and sterilize by autoclaving (e.g., 121 °C for 15 minutes, literature guidance).
  • For agar plates, add agar (literature ~15 g/L) prior to sterilization. Cool to 50–55 °C before pouring plates; dry plates to remove surface moisture.
  • Add heat-labile supplements (e.g., vitamins, antibiotics) by sterile filtration after cooling.

• Incubation (general, literature):

  • Many filamentous fungi grow well at 25–30 °C; adjust temperature and aeration to organism needs. Incubate plates inverted to minimize condensation; shake flasks at 150–250 rpm for Broths to maintain oxygenation.
  • Typical inoculum sizes: spot inoculation for colony morphology; 1–5% v/v spore or mycelial suspensions for Broths (optimize empirically).

• Quality checks:

  • Include sterility controls for each batch. Verify growth with a reference strain appropriate to your application (e.g., Aspergillus niger, literature) as an internal growth-promotion check.

All numeric values above are general literature practices and not specifications for this catalog item.

Safety and Handling

• GHS/SDS note:

  • Signal Word: Not specified for this item; refer to CoA/Spec Sheet and SDS.
  • H-Statements / Pictograms / Classification: Not specified for this item; refer to SDS for authoritative hazard information.

• General laboratory precautions (mixtures of salts and carbohydrate):

  • May cause mechanical eye/skin/respiratory irritation as dust; avoid dust generation and inhalation. Use local exhaust or handle in a fume hood during weighing.
  • Wear appropriate PPE: lab coat, safety glasses, and suitable gloves. Wash thoroughly after handling.
  • Avoid contact with strong oxidizers and moisture; keep container tightly capped to prevent caking and microbial contamination.

• Thermal/sterilization safety:

  • When autoclaving prepared medium, do not tightly cap vessels; allow for pressure equalization to prevent rupture. Follow institutional autoclave SOPs.
  • Carbohydrate-containing media can undergo Maillard reactions and caramelization if overheated; sterilize at validated conditions (e.g., 121 °C for 15 min, literature guidance) to limit nutrient degradation. Allow media to cool before adding heat-labile supplements (if any).

• First-aid overview (general):

  • Inhalation: Move to fresh air; seek medical advice if symptoms persist.
  • Eye contact: Rinse cautiously with water for several minutes; remove contact lenses if present and easy to do; seek medical attention if irritation persists.
  • Skin contact: Wash with soap and water; remove contaminated clothing.
  • Ingestion: Rinse mouth; seek medical advice if unwell.

• Disposal: Treat as laboratory chemical waste or non-hazardous nutrient waste per local regulations; sterilize spent media before disposal to inactivate biologicals.

Solvent Selection

This product is a dry culture medium intended to be dissolved in water; it is not a solvent and solvent selection is generally not applicable.

• Practical guidance:

  • Use freshly prepared, deionized or distilled water for reconstitution to minimize precipitation from hardness ions.
  • If preparing highly defined studies, carbon source quality (e.g., sucrose) and water resistivity can influence reproducibility; avoid organic solvents unless adding sterile-filtered supplements.

• Alternatives when solvent choice matters:

  • For membrane-sterile additions (e.g., vitamins), prepare stock solutions in water or appropriate sterile aqueous buffers and filter (0.22 μm) before aseptic addition to the cooled, sterilized medium.

Storage and Reconstitution

• Item-specific storage (from Product Data):

  • Storage Conditions: Room temperature
  • Shipped In: Normal

• Storage guidance (general):

  • Keep container tightly closed in a cool, dry place. Protect from moisture and airborne contaminants. Avoid prolonged exposure to light and humidity to prevent caking and degradation of heat-labile trace components (if any).
  • Use clean, dry scoops; do not return unused material to the container to avoid contamination.

• Reconstitution (general, literature; not item-specific):

  • Weigh the specified grams of medium per liter (exact g/L for this item are Not specified for this item; refer to CoA/Spec Sheet). Dissolve in purified water with stirring; adjust pH if required. Sterilize by autoclaving (e.g., 121 °C, 15 min, literature) unless sterile-filtering is appropriate for your application.
  • For agar media, dissolve agar thoroughly by heating before sterilization. Cool to ~50–55 °C to pour plates or to add sterile, heat-labile supplements.

• Shelf life:

  • Not specified for this item; refer to CoA/Spec Sheet. In general, store dry medium at room temperature and use promptly once opened. Prepared media are best used within days to weeks depending on storage (refrigeration) and sterility controls.

• Research Use Note: For research use only (per Product Data).

Structure and Identity

Czapek-Dox Medium is a chemically defined microbiological growth medium, supplied as a blended dry powder comprising multiple inorganic salts and a carbon source. It is a mixture, not a single compound, so single-molecule identifiers do not apply.

• Item-specific identifiers (from Product Data):

  • SKU: C1528277
  • Product Name: Czapek-Dox Medium
  • Grade/Purity: BioReagent
  • CAS: Not specified for this item; refer to CoA/Spec Sheet.
  • Molecular Formula: Not applicable (mixture)
  • Molecular Weight: Not applicable (mixture)
  • InChIKey / SMILES: Not applicable (mixture)

• Structural features (general, literature):

  • Defined, mineral-salt medium with an inorganic nitrogen source (classically sodium nitrate), phosphate buffer salt, magnesium and potassium salts, trace iron, and a carbohydrate (commonly sucrose) as the major carbon source.
  • No stereochemistry or discrete ring systems are relevant because the product is a formulation rather than a single molecule.

• 2D “structure” in words (general):

  • A homogeneous blend of crystalline salts and sugar designed to dissolve in water to yield a clear medium supporting growth of saprophytic and filamentous fungi (e.g., Aspergillus, Penicillium) that can assimilate nitrate.

• Note:

  • Exact component list and concentrations for this catalog item are not specified; consult the product CoA/Specification Sheet for the definitive formulation.
  • For research use only (per Product Data).

Synthetic Utility

This product is a biological culture medium and is not typically used as a reagent or building block in chemical synthesis.

• Relevance to chemists (general):

  • As a defined aqueous matrix, it can serve as a standardized medium for biotransformations conducted with whole fungal cells or enzymes secreted by filamentous fungi. In such cases, the medium composition influences expression levels of oxidases, hydrolases, and other enzymes (literature), but it is not a stoichiometric reactant.
  • If chemical compatibility is a concern (e.g., introducing small-molecule substrates for biocatalysis), consider the ionic strength, presence of trace metals, and pH of the prepared medium (all formulation-specific; Not specified for this item).

• For synthetic organic transformations: choose appropriate chemical solvents and reagents; this medium offers no specific synthetic advantage outside of biocatalytic contexts.

Target Specificity

Not applicable. This product is a general-purpose defined culture medium and does not possess molecular target specificity (e.g., no antibody/ligand target). There are no clone, isotype, or species-reactivity attributes. For organism suitability, see Reaction & Applications and Biological Roles.