Minimal Broth (without Glucose) - BioReagent

Cat. No.: M1528383

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Visão geral

For isolation and characterization of auxotrophic mutant strains of Escherichia coli and Bacillus subtilis

Specifications

Especificações e pureza

BioReagent

Condições de armazenamento de armazenamento

Room temperature

Enviado em

Normal

Grau

BioReagent

Product Line

Produtos biológicos

Application Protocols

Item-specific facts (from Product Data)

• No manufacturer protocol text provided. Follow the instructions on the product label/CoA for exact g/L, target pH, and sterilization method. Values are not specified for this item.

General preparation workflow (literature; not item-specific)

1. Weigh the dehydrated medium according to the label-specified grams per liter into a clean vessel.
2. Add ~80–90% of the final volume of purified water (ASTM Type 1/2). Stir to dissolve completely.
3. Adjust pH to the specified target, if directed by the label.
4. Bring to final volume with purified water.
5. Sterilize:
   • Autoclave at 121 °C for 15–20 min if all components are heat-stable, or
   • Sterile-filter through a 0.22 μm membrane if heat-labile components are present.
6. Cool to ~50 °C. Aseptically add sterile carbon source (e.g., glucose stock solution) and any required supplements (amino acids, vitamins, trace elements, antibiotics) to desired final concentrations per your SOP.
7. Mix gently, dispense aseptically, and store as directed.

Quality control (general)

• Verify clarity, pH, and conductivity after preparation. Confirm growth with a control strain on a known-utilizable carbon source to qualify the batch for experiments.

Biological Roles

Scope

• Minimal Broth (without Glucose) functions as a defined basal medium to support microbial growth only when a suitable carbon/energy source and any required auxotrophic supplements are provided.

Roles in microbiology and biochemistry (general)

• Nutrient control: By omitting glucose, this medium enables precise control over carbon catabolite repression and allows interrogation of specific metabolic pathways by supplying an alternative, defined carbon source (e.g., acetate, glycerol, succinate; literature).
• Selection pressure: Facilitates selection for prototrophic revertants, assessment of amino acid/vitamin auxotrophies, and maintenance of engineered dependencies. Researchers can add single metabolites to map growth requirements and gene-function relationships.
• Flux and regulation studies: Serves as a clean background for isotope-labeled substrates in 13C metabolic flux analysis, N assimilation studies (15N), and transcriptional regulation assays sensitive to nutrient status.
• Physiological benchmarking: Supports determination of growth kinetics (lag, μmax, yield), substrate uptake rates, and respiration profiles under low-background conditions where rich-media artifacts are minimized.
• Expression systems and stress: Useful for examining stress responses (osmotic, oxidative) and catabolite repression/activation phenomena because ionic composition and buffering can be held constant while varying one input at a time (literature).

Notes

• Exact ionic composition, buffer system, and pH targets are formulation-specific and not provided here; consult the CoA/Spec Sheet for item-specific details.

Buffer Applications

Applicability note

• This product is a culture medium base; its buffering behavior depends on its formulation, which is not specified for this item. Refer to CoA/Spec Sheet for exact pH targets and buffer components.

General/literature guidance (not item-specific)

• Many minimal media employ phosphate buffering systems that maintain pH near neutrality (~pH 7.0) during exponential growth. Alternative buffers (e.g., MOPS) may be used for Good’s-buffered minimal media when phosphate interference must be avoided.
• When preparing concentrated stocks, adjust pH at room temperature; temperature shifts can alter apparent pH of phosphate and Good’s buffers (literature). Re-verify pH after sterilization as autoclaving can slightly change pH.
• For pH-sensitive experiments, prepare separate sterile stock buffers and add to the sterile basal salts to achieve the desired final pH/ionic strength under aseptic conditions.

Green Alternatives

Context

• As a water-based, salt-only basal medium, Minimal Broth is inherently aligned with green chemistry principles: it is aqueous, typically free of volatile organic solvents, and supports energy-efficient sterilization in standard autoclaves.

Considerations and options (general)

• Packaging impact: Choose larger pack sizes to reduce packaging waste when appropriate and feasible for your throughput. Employ reusable glassware for reconstitution and storage where validated.
• Energy use: Autoclaving consumes energy; for small volumes or heat-labile supplements, consider sterile filtration (0.22 μm) to reduce autoclave cycles, where process validation permits.
• Waste minimization: Prepare only the volumes needed; minimal media simplify downstream waste treatment because of low organic load compared with rich media.

Comparison (literature-informed, not item-specific)

• Minimal vs rich media: Minimal broths reduce biological oxygen demand (BOD) and nutrient loading in waste streams relative to complex broths (e.g., LB/TSB), aiding greener lab operations.
• Carbon source choice: Select renewable or less hazardous carbon sources when biologically acceptable (e.g., glycerol from biodiesel byproduct streams), noting any impacts on physiology.

Pharmaceutical Uses

Scope

• No therapeutic or clinical uses are claimed. For research/laboratory use only (per Product Data).

Industry/lab context (general)

• QC microbiology: Minimal broths are used in pharmaceutical and biotech laboratories for microbial characterization (e.g., carbon source utilization tests), growth promotion/inhibition controls tailored to defined nutrients, and suitability testing of analytical methods where complex media are undesirable.
• Process development: Employed in strain development and metabolic engineering to evaluate nutrient requirements, optimize defined feed compositions, and deconvolute media effects on product quality attributes under controlled conditions.
• Raw material qualification: Defined minimal broths can serve as controlled matrices for assessing the impact of specific excipients or leachables on microbial growth in risk assessments.

Regulatory note

• This BioReagent-grade product is not manufactured to pharmacopeial monographs. If compendial compliance is required (e.g., USP/EP media), verify against applicable standards or select a medium explicitly qualified to those monographs.

Physical Properties

Item-specific facts (from Product Data)

• Physical state/appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight (of mixture): Not applicable to mixtures; Not specified for this item; refer to CoA/Spec Sheet.
• Other physicochemical specifications (pH range after reconstitution, osmolality, solubility in water): Not specified for this item; refer to CoA/Spec Sheet.

General/literature values (for minimal salt broths; not item-specific)

• Solubility: Readily soluble in water to the labeled concentration (literature).
• Typical pH after reconstitution (at 25 °C): near neutral if phosphate-buffered, commonly ~7.0 ± 0.2 (literature).
• Density/refractive index: Not generally defined for dehydrated media; depends on final concentration (literature).

Notes for practitioners

• Use high-purity water (e.g., ASTM Type 1/2) to minimize adventitious ions that can alter growth phenotypes.
• Final ionic strength and pH are formulation-dependent; validate with pH meter and conductivity after preparation as part of media QC.

Quality and Grades

Item-specific facts (from Product Data)

• Grade: BioReagent
• Research use: For research use only (Product Data). Not for diagnostic or therapeutic use.

What BioReagent grade implies (general)

• BioReagent products are intended for life science workflows, with raw materials and processing suited for reproducible biological performance. While not equivalent to cGMP or pharmacopeial grades, BioReagent media bases are commonly qualified for microbial culture, cloning workflows, phenotype screens, and method development.

Quality considerations for minimal broths (general guidance)

• Lot-to-lot consistency: Monitor pH (at labeled concentration), clarity, and growth performance using control strains (e.g., E. coli K-12) and defined carbon sources.
• Endotoxin/bioburden: Dehydrated mixes should be low in bioburden; sterilization after reconstitution is required. If endotoxin sensitivity matters (e.g., for OMV or LPS studies), test reconstituted media and water in-house.
• UV absorbance/background: For optical assays, confirm low background at analytical wavelengths used (e.g., 600 nm for OD). Minimal salt media typically have negligible absorbance, but turbidity from insolubles indicates water quality or improper dissolution.
• Documentation: For any item-specific specifications (pH targets, g/L), refer to the product label and CoA/Spec Sheet. Those values are not specified here.

Reaction and Applications

Section scope note

• Classical organic/inorganic reaction applications are not applicable to a microbiological medium. Instead, relevant “applications” involve microbial cultivation under defined nutrient conditions.

Microbiological applications (general)

• Selection and screening: Minimal broth without glucose supports selection for prototrophy, carbon source utilization tests, and maintenance of plasmid selection markers when paired with defined supplements (e.g., amino acids, vitamins, antibiotics added post-sterilization).
• Physiology and metabolism: Enables studies of catabolic pathway induction by providing an alternate, defined carbon source (e.g., acetate, succinate, glycerol; literature), and quantifying growth yields, substrate uptake, or flux analyses.
• Isotope tracing: Ideal base for 13C/15N metabolic flux analysis when combined with isotopically labeled substrates (literature), minimizing background from undefined nutrients.
• Expression systems: Supports tightly controlled expression in strains where rich-media components confound regulation (e.g., catabolite repression studies; literature).

Practical tips (general)

• Prepare separate sterile stocks for carbon sources and Mg/Ca salts if your SOP indicates precipitation during autoclaving; add aseptically after cooling to ~50 °C.
• Validate growth with a reference strain and a known-utilizable carbon source to confirm media performance per lot.

Reaction Conditions

Not applicable to chemical synthesis.

General microbiological use conditions (literature; not item-specific)

• Temperature: Grow mesophilic bacteria commonly at 30–37 °C; adjust per organism.
• Aeration: Shaking (e.g., 180–250 rpm in baffled flasks) or sparged bioreactors to maintain oxygenation for aerobes; use appropriate oxygen transfer for high-salt or viscous conditions.
• Inoculum: Standardized to defined OD or CFU; pre-cultures often adapted to the same carbon source to avoid diauxic lags.
• pH: Maintain near neutral; apply buffering or pH-stat in bioreactors as metabolism acidifies/alkalinizes the medium. These are general practices and not specifications for this item.

Safety and Handling

Item-specific facts (from Product Data)

• GHS classification, signal word, hazard statements, pictograms: Not specified for this item; refer to SDS.
• Storage conditions: Room temperature (per Product Data). Shipped at ambient conditions.

General safety guidance (not a substitute for SDS)

• PPE: Wear lab coat, safety glasses, and appropriate gloves when handling powders and solutions.
• Avoid dust generation and inhalation; handle powders in a clean, low-draft area or powder hood. Minimize exposure of sterile components to ambient air to reduce bioburden.
• Incompatibilities: Strong acids/bases may alter buffer capacity; moisture will cause caking and potential degradation of certain components. Keep container tightly closed and desiccated when possible.
• Hygiene: Wash hands after handling; avoid contact with skin/eyes. Do not ingest. For laboratory use only.
• First aid overview: If inhaled, move to fresh air. In case of skin/eye contact, rinse with water for several minutes. If ingested, rinse mouth. Seek medical advice as appropriate. Always consult the SDS for authoritative measures.
• Sterilization hazards: Autoclaving is standard for sterilization; do not autoclave heat-labile supplements (e.g., vitamins, antibiotics) together—filter-sterilize and add aseptically after cooling (general practice).

Solvent Selection

Applicability note

• This product is a dehydrated culture medium intended to be dissolved in water; organic solvent selection is not applicable.

Practical guidance (general)

• Solvent: Use purified water (ASTM Type 1/2 or equivalent). Avoid tap water to prevent variable ion loads and chlorine/chloramine interference.
• Sterilization: Autoclave the reconstituted basal medium if components are heat-stable. Alternatively, sterile-filter through 0.22 μm PES or PVDF membranes if heat-sensitive supplements are present.
• Carbon source addition: Because glucose is omitted, choose and prepare the carbon source separately (e.g., sterile 20–40% w/v glucose stock, or defined alternatives like glycerol or acetate) and add aseptically to the cooled sterile medium.
• Comparison to rich media: Minimal broth yields slower growth but tighter control over metabolic inputs versus complex broths (e.g., LB, TSB). Choose minimal broth when selection pressure or defined nutrient conditions are required.

Storage and Reconstitution

Item-specific facts (from Product Data)

• Storage conditions: Room temperature.
• Shipping: Normal (ambient) conditions.
• Additional item-specific guidance (e.g., moisture protection, shelf life, reconstitution concentration, target pH): Not specified for this item; refer to CoA/Spec Sheet and label instructions.

General guidance (not item-specific)

• Keep container tightly closed in a cool, dry place. Protect from moisture and atmospheric CO2 to prevent caking or pH drift.
• After reconstitution and sterilization, store liquid medium at 2–8 °C. For best performance, use within 1–2 weeks; sterile-filtered media with heat-labile supplements may have shorter stability (literature).
• Avoid repeated warming/cooling cycles; aliquot into working volumes where possible. Do not freeze phosphate-rich media unless validated, as salt precipitation can occur upon thawing.
• Label all prepared media with composition, carbon source and concentration, lot number, pH, sterilization method, preparation date, and expiry per your laboratory’s QA procedures.

Structure and Identity

Item-specific facts (from Product Data)

• Product type: Dehydrated microbiological medium — Minimal Broth (without Glucose)
• Grade: BioReagent
• CAS, CID, InChIKey, SMILES, molecular formula, molecular weight: Not specified for this item; refer to CoA/Spec Sheet.

General/literature context

• Minimal broths are defined, salt-based media supplying essential inorganic ions and nitrogen, with carbon supplied separately (here, glucose is intentionally omitted). Typical functional components in minimal media include: a nitrogen source (e.g., ammonium salt), phosphate buffer system (monobasic/dibasic), essential cations/anions (e.g., Mg2+, Ca2+, sulfate, chloride), and sometimes trace metals (literature).
• Structural features: As a mixture of inorganic salts and possibly vitamins/trace elements, no single molecular structure applies. The “structure” is a composite of ionic species in aqueous solution upon reconstitution.

2D/functional description (literature)

• Upon dissolution in water, the medium yields an aqueous, buffered ionic solution supporting basic cellular functions, while the carbon/energy source is to be provided separately (e.g., glucose, glycerol, acetate), enabling controlled metabolic studies.

Synthetic Utility

Not typically applicable.

• As a dehydrated microbiological medium, this product is not used as a synthetic reagent or building block. For relevant information, see Biological Roles and Application Protocols sections for culture-related use.

Target Specificity

Not applicable.

• This product is not an antibody, enzyme, or affinity reagent. No target/epitope specificity information applies.