Malt Extract Broth (MEB) - BioReagent

Cat. No.: M1528430

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Übersicht

For fungicidal testing

Specifications

Spezifikationen & Reinheit

BioReagent

Storage

Room temperature

Verschickt in

Normal

Note

BioReagent

Product Line

Biologische Produkte

Application Protocols

General-use protocol for Malt Extract Broth (literature; adjust per your SOP):

• Reconstitution:
  • Weigh the desired amount of powder to achieve your target concentration (commonly in the ~35–50 g/L range; formulation-dependent).
  • Add to deionized water while stirring; warm gently to dissolve completely.
  • Adjust pH if required (often ~5.4–5.8 at 25 °C), then dispense into suitable vessels.
• Sterilization:
  • Autoclave at 121 °C for 15 min. Alternatively, sterile-filter (0.22 µm) and maintain asepsis.
• Inoculation and incubation:
  • Inoculate with the organism of interest (yeast/mold) under aseptic conditions.
  • Incubate at 25–30 °C with shaking for yeasts (150–250 rpm) or static for molds as appropriate.
  • Monitor turbidity, CFU, or dry cell weight as needed.
• Optional supplements:
  • Add antibiotics, acidifiers, or trace elements aseptically post-sterilization if required by the study design.

Note: This protocol is general guidance only. The specific preparation instructions, concentrations, and pH for this item are not specified; consult the product’s CoA/Spec Sheet and your institutional SOPs.

Biological Roles

While MEB is not a biomolecule, it fulfills key biological functions as a nutrient matrix for microbial growth.

General roles in microbiology (literature):

• Provides readily assimilable carbon sources (maltose, glucose, dextrins) that support fermentative and respiratory metabolism in yeasts and molds.
• Supplies nitrogen (e.g., peptides, amino acids) and growth factors (B-vitamins, minerals) that facilitate biomass accumulation, sporulation, and metabolite production in fungi.
• Mildly acidic pH discourages many bacteria, increasing relative selectivity for fungi.
• Used to study physiology (sugar utilization, ethanol production, secondary metabolite profiles) and to prepare high-density inocula for downstream experiments.

Application contexts:

• Food and beverage microbiology (brewery/winery research), environmental mycology, and bioindustrial strain development.

Note: Specific organism performance and growth curves depend on strain, inoculum size, aeration, temperature, and exact medium formulation. This item’s composition details are not specified; refer to CoA/Spec Sheet.

Buffer Applications

MEB is not a dedicated buffering system. It exhibits limited intrinsic buffering from amino acids and phosphates present in extracts, but it is primarily a nutrient medium rather than a buffer.

• If buffering capacity or precise pH control is required, prepare MEB in conjunction with a defined buffer (e.g., citrate–phosphate, acetate, or phosphate buffers) adjusted to the target pH (literature guidance).
• Any buffering salts or pH modifiers should be verified for compatibility and added prior to sterilization or aseptically post-sterilization as appropriate.

Exact pH specifications for this item are not provided; refer to CoA/Spec Sheet.

Green Alternatives

MEB is largely plant-derived (malt extract from malted barley) and can serve as a lower-impact alternative to media relying heavily on animal-derived components.

Sustainability considerations (general):

• Feedstock: Renewable agricultural inputs (barley) vs. animal-origin peptones; however, some MEB variants include peptone (origin varies). Verify formulation on CoA/Spec Sheet.
• Energy: Prefer sterile filtration for small batches to reduce autoclave energy use when appropriate and validated.
• Waste: Autoclave biological waste prior to disposal; segregate to minimize volume. Avoid unnecessary supplementation that increases chemical load.

Comparison (literature, general):

• Malt Extract Broth vs. Sabouraud Dextrose Broth
  • Carbon source: Complex malt carbohydrates vs. high dextrose
  • Origin: Plant-heavy vs. may include more animal-derived peptone
  • Environmental note: Plant-derived components may reduce dependency on animal products

Trade-offs:

• Batch variability in natural extracts can be higher than in defined media; may require additional QC for critical applications.

Note: Exact composition and origin of components for this item are not specified; consult the CoA/Spec Sheet for sourcing and any certifications.

Pharmaceutical Uses

No therapeutic use is implied. For research and process development contexts, MEB can serve in microbiological quality control and development workflows.

General, non-clinical applications (literature/industry practice):

• Environmental monitoring research, bioburden assessment method development, and growth promotion studies for fungal isolates in manufacturing R&D labs.
• Strain banking and revival protocols for yeast/fungal research strains used in upstream bioprocess development.
• Excipient screening for microbial robustness in stability studies (e.g., assessing preservative efficacy against yeasts/molds) in a research setting.

Regulatory note:

• This product is designated BioReagent and For research use only (from Product Data). It is not manufactured to compendial pharmacopeial monographs unless explicitly stated elsewhere. Validation for any QC/QA purpose is the responsibility of the end user.

Item-specific compendial status and growth-promotion criteria are not specified; refer to CoA/Spec Sheet.

Physical Properties

• Appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Solubility: Freely soluble in water (general/literature for malt extract-based media). Insoluble in nonpolar organic solvents.
• pH (prepared broth): Typically mildly acidic, often around pH 5.4–5.8 at 25 °C (literature, formulation-dependent). Not specified for this item.
• Density, melting/boiling point, refractive index, logP: Not applicable or not defined for complex dry blends; not specified for this item.
• Hygroscopicity: Moderately hygroscopic (general for powdered media); exposure to ambient humidity can cause caking and reduced shelf life.

Practical notes (general/literature):

• Dissolution in deionized water is rapid with mild heating and stirring; avoid localized overheating to prevent Maillard browning.
• Prepared broth is typically clear to slightly hazy, light amber (formulation- and water-quality dependent). The exact visual specification for this item is not specified; refer to CoA/Spec Sheet.
• Filterability is suitable through 0.22–0.45 µm membranes if sterile filtration is preferred over heat sterilization (literature guidance).

Quality and Grades

• Grade/Purity (from Product Data): BioReagent

What BioReagent typically implies (general):

• Manufactured and QC’d for research and laboratory use, suitable for microbiology workflows (medium performance assessed by growth promotion testing in many suppliers; specific tests for this item are not specified here).
• Emphasis on low contaminant burden appropriate for biological experiments; however, not intended for clinical/diagnostic use unless otherwise validated by the end user.

Item-specific notes:

• Exact formulation, growth-promotion criteria, microbial limits, and heavy metal content are not specified for this item; refer to CoA/Spec Sheet.
• If present, any stabilizers, anti-caking agents, or pH indicators would be listed on the specification; none are specified here.

Practical guidance:

• For reproducibility across studies, retain lot numbers and consider pilot growth tests with representative organisms (e.g., Saccharomyces spp., Aspergillus spp.) when changing lots.
• Use high-purity water (e.g., ≥18 MΩ·cm) for reconstitution to minimize variability due to water TOC, ions, or chlorine.

Reaction and Applications

This product is a microbiological medium rather than a reagent for chemical reactions. Its primary applications are in fungal and yeast cultivation.

Typical laboratory applications (general/literature):

• Cultivation and maintenance of yeasts (e.g., Saccharomyces, Kluyveromyces, Pichia) and filamentous fungi (e.g., Aspergillus, Penicillium) due to its carbohydrate-rich, mildly acidic profile.
• Enumeration and monitoring of yeasts/molds in environmental samples and food/beverage QC.
• Propagation of brewing, baking, and bioindustrial strains for research-scale studies.
• Starter cultures ahead of solid medium inoculation (e.g., Malt Extract Agar) or downstream assays (e.g., metabolite profiling, enzyme production studies).

Practical tips (literature):

• Adjust pH (commonly ~5.4–5.8) before sterilization to target organism preference; acidification can suppress bacterial contaminants.
• If heat-sterilizing, autoclave at 121 °C for ~15 min; avoid over-sterilization to limit sugar degradation.
• For selective work, antibiotics or acidifiers (e.g., tartaric acid) are sometimes added after sterilization under aseptic conditions.

Note: Any organism performance claims are culture- and protocol-dependent. This item’s specific growth-promotion criteria are not specified; refer to CoA/Spec Sheet.

Reaction Conditions

Interpreted as medium preparation and cultivation conditions (not chemical reactions).

General preparation (literature guidance; not item-specific):

• Concentration: Typical recipes use total solids on the order of ~35–50 g/L depending on formulation and organism needs.
• Dissolution: Add powder to deionized water with stirring; warm gently (≤60–70 °C) to aid dissolution. Avoid scorching.
• pH: Adjust to target (often ~5.4–5.8) at 25 °C prior to sterilization if required.
• Sterilization: Autoclave 121 °C, 15 min. Alternatively, sterile filter through 0.22 µm membranes when heat-sensitive supplements are present.

Cultivation parameters (literature/general):

• Inoculation: Aseptic transfer of a single colony or spore suspension.
• Temperature: Many yeasts grow well at 25–30 °C; filamentous fungi often at 25–28 °C. Actual optima are strain-specific.
• Aeration: Shaking at 150–250 rpm in baffled flasks enhances oxygen transfer for yeasts.
• Incubation time: 18–72 h for yeasts; 2–7 days for molds, depending on growth rate and endpoint.

Note: Exact preparation instructions, concentration, and pH specification for this item are not provided; refer to CoA/Spec Sheet.

Safety and Handling

• GHS classification: Not specified for this item; refer to SDS.
• Signal word / H-statements / Pictograms: Not specified for this item; refer to SDS.

General laboratory safety (for powdered culture media; literature/best practice):

• PPE: Lab coat, nitrile gloves, safety glasses. Avoid creating dust; use in a well-ventilated area.
• Incompatibilities: Avoid moisture and strong oxidizers. Product supports microbial growth once hydrated—treat used/contaminated broth as biohazardous waste.
• First aid (overview):
  • Inhalation: Move to fresh air; seek medical attention if symptoms persist.
  • Skin/eyes: Rinse with water for several minutes; remove contaminated clothing.
  • Ingestion: Rinse mouth; seek medical advice if unwell.
• Fire safety: Organic powder; may burn if involved in a fire. Use water spray, CO2, or dry chemical. Avoid dust clouds near ignition sources.
• Sterilization and waste: Autoclave spent cultures and contaminated disposables according to institutional biosafety procedures (e.g., 121 °C, 15 min; literature) before disposal.

Always consult the product-specific SDS and institutional biosafety guidelines for authoritative safety information.

Solvent Selection

Malt Extract Broth is intended to be reconstituted in water; organic solvents are not applicable.

• Primary solvent: Deionized or distilled water (sterile or to be sterilized after dissolution).
• Water quality (general best practice):
  • Resistivity ≥ 10–18 MΩ·cm and low TOC helps minimize background haze and caramelization during sterilization.
  • Degassing is unnecessary; avoid excessive heating to prevent Maillard reactions.
• Sterilization options (literature):
  • Autoclaving at 121 °C for ~15 min in suitable containers.
  • Sterile filtration (0.22 µm) if thermal degradation or caramelization is a concern; follow with aseptic handling.

Comparison (general):

• MEB vs. Sabouraud Dextrose Broth (SDB): MEB is plant-derived and typically more vitamin-rich; SDB is often higher in dextrose and peptone, favoring certain fungi. Choice depends on target organism and selectivity needs.

Note: Specific reconstitution concentration for this item is not specified; refer to CoA/Spec Sheet.

Storage and Reconstitution

• From Product Data:
  • Storage Conditions: Room temperature
  • Shipped In: Normal
  • Research Use Note: For research use only

Storage guidance (general/best practice for powdered media):

• Keep container tightly closed in a cool, dry place, protected from humidity and light. Use desiccant where possible.
• Avoid frequent open/close cycles; aliquot into clean, dry containers if high-frequency access is expected.
• Do not use if caked, discolored, or with off-odors—verify against CoA/Spec Sheet.

Reconstitution (general/literature):

• Use deionized or distilled water. Dissolve with stirring; adjust pH if required, then sterilize (autoclave 121 °C, 15 min) or sterile-filter (0.22 µm) and handle aseptically.
• Prepared broth: Store at 2–8 °C and use promptly; discard if turbidity or contamination appears in uninoculated controls (time limits per institutional SOP).

Item-specific composition, target concentration, and pH specifications are not specified for this item; refer to CoA/Spec Sheet.

Structure and Identity

Malt Extract Broth (MEB) is a complex, undefined microbiological medium formulated to support the growth of yeasts and molds. It is not a single chemical entity and therefore lacks a unique molecular structure.

• Item type: Complex mixture / culture medium (not a discrete compound)
• Molecular formula: Not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight: Not specified for this item; refer to CoA/Spec Sheet.
• SMILES: Not applicable to complex mixtures; not specified for this item.
• InChIKey: Not applicable to complex mixtures; not specified for this item.
• Structural features (general/literature):
  • Typically derived from malt extract (a blend of carbohydrates, amino acids, vitamins, and minerals from malted barley) and a nitrogen source (e.g., peptone) to enhance microbial growth.
  • Contains predominantly carbohydrates (maltose, glucose, dextrins) as carbon sources and free amino nitrogen from peptides; also includes B-vitamins and minerals (literature).
• 2D description in words (general): A powdered blend of hydrophilic, water-soluble nutrients. Upon dissolution in water it forms a mildly acidic, nutrient-rich broth suitable for fungal culture.

Note: Exact formulation, lot-to-lot nutrient profile, and any additives (e.g., additional dextrose) are formulation-dependent and are not specified for this item; refer to CoA/Spec Sheet.

Synthetic Utility

Not typically applicable. Malt Extract Broth is a biological culture medium, not a reagent for chemical synthesis.

• It does not participate in named organic reactions nor serve as a traditional building block or solvent for synthetic transformations.
• For chemical biotransformations or whole-cell catalysis research, MEB may serve as a growth medium to cultivate the biocatalyst organism prior to harvesting cells or preparing resting cell suspensions (general/literature). In such cases, the medium influences cell health rather than the reaction chemistry itself.

For synthetic chemistry needs, select reagents and solvents designed for reaction compatibility; see other catalog sections.

Target Specificity

Not applicable. This product is not an antibody or affinity reagent and has no antigen/epitope specificity. It is a general-purpose fungal/yeast growth medium.

Any organismal selectivity arises from nutrient composition and pH (literature) rather than specific binding.

Häufig gestellte Fragen

How should this product be stored?

Store at room temperature.