Stantz Differential Medium (SDM) - BioReagent

Cat. No.: S1528649

등급 & 순도 BioReagent

Storage

Room temperature

Shipped In

Normal

개요

For testing of wild yeast in beer

사양

사양 및 순도

BioReagent

보관 조건

Room temperature

배송

Normal

등급

BioReagent

Product Line

생물 제품

Application Protocols

The following outlines a general workflow for preparing and using differential microbiological media. Product-specific values (e.g., grams per liter) for SDM are Not specified; refer to the product label/CoA/Spec Sheet.

A. Preparation (literature, general)

• Weigh the labeled quantity of dehydrated SDM into a suitable flask.
• Add ~80–90% of the final volume of purified water (Type I/II). Stir to disperse; rinse in remaining water to volume.
• Heat with agitation if permitted to achieve complete dissolution. Do not boil unless specified.
• Adjust pH only if directed by the Spec Sheet.
• Sterilize by autoclaving at 121 °C for 15 minutes unless an alternative is specified. For heat-labile supplements, cool to 45–50 °C and aseptically add sterile-filtered additives.

B. Plates (if applicable)

• For agar media, pour into sterile Petri dishes at ~50–55 °C. Allow to solidify; dry plates briefly with lids ajar in a biosafety cabinet to remove surface moisture.

C. Inoculation and incubation

• Streak or spread inoculum under aseptic conditions. Incubate under organism-appropriate conditions (temperature/atmosphere) until colonies develop and differential reactions are evident.

D. Quality checks

• Include positive/negative control strains to confirm expected differential outcomes.
• Inspect for sterility (no growth in uninoculated control) and proper color/clarity.

Dispose of all materials as biohazard waste per institutional policy.

Biological Roles

In research microbiology, differential media like SDM provide a controlled nutritional and chemical environment that reveals phenotypic differences among organisms.

General biological functions (literature):

• Nutritional support: Supplies carbon, nitrogen, minerals, and growth factors from complex digests (e.g., peptones/yeast extract), enabling broad growth while preserving differential readouts.
• Differential chemistry: Incorporates substrates and one or more indicators (pH or chromogenic) that transduce microbial metabolism into color or opacity changes.
• Selectivity (if included): Some differential formulations also contain selective agents that inhibit background flora, enriching for target groups while still allowing differential outcomes.
• Buffering capacity: Phosphate or similar systems often stabilize pH to keep indicator responses interpretable.

Use cases:

• Strain characterization in academic/industrial labs.
• Monitoring genetic modifications that alter metabolism (e.g., pathway knock-ins/outs) through visible colony phenotypes.
• Teaching laboratories to demonstrate metabolic diversity.

Scope notes for this product:

• Specific metabolic targets, indicators, and selective components for Stantz Differential Medium (SDM) are Not specified for this item; refer to CoA/Spec Sheet.
• Results are presumptive; follow up with targeted biochemical tests or sequencing for definitive identification. For research use only, as stated by the manufacturer.

Buffer Applications

SDM is not a dedicated buffer; however, most differential media include buffering components to maintain a near-neutral pH during microbial growth so that indicator systems respond reliably.

• Typical medium pH range at 25 °C (literature, general): ~6.8–7.4 at working concentration, subject to the specific formulation.
• Buffer systems commonly encountered in media (literature, general): phosphate, Tris, or organic acid/conjugate base pairs. The exact buffering system in SDM is Not specified for this item; refer to CoA/Spec Sheet.

Practical guidance:

• Calibrate pH meter and verify pH of reconstituted medium before sterilization; adjust only if expressly directed by the Spec Sheet (many differential systems rely on precise pH for accurate readouts).
• Avoid CO2 absorption during cooling (can acidify phosphate buffers); keep vessels loosely capped and minimize headspace exposure.
• For media incorporating heat-labile buffers or indicators, sterilize by membrane filtration rather than autoclaving if specified (for this item: Not specified; refer to CoA/Spec Sheet).

Electrophoresis/cell culture note:

• SDM is formulated for microbial culturing/differentiation and is not typically used as an electrophoresis running buffer or as a mammalian cell culture buffer. For such applications, choose dedicated systems (e.g., TAE/TBE or PBS, respectively).

Green Alternatives

SDM is an aqueous, room-temperature-stable formulation; environmental impacts mainly arise from energy use (sterilization/incubation), water consumption, and single-use plastics.

Greener practice considerations (literature, general):

• Energy reduction:
  • Optimize autoclave loads to full capacity; use validated shorter cycles where permitted.
  • Use stackable plate formats and clustered incubations to reduce equipment runtime.
• Water stewardship:
  • Prepare only the volume needed; avoid overproduction that leads to disposal.
  • Use closed-loop jacket cooling on autoclaves where available.
• Waste minimization:
  • Choose reusable glassware (bottles, flasks) when biosafety policies allow; if disposables are required, select recyclable plastics and segregate clean vs. biohazard waste.
• Safer chemistry:
  • SDM’s aqueous base avoids volatile organic solvents; selective/differential agents, if present, should be handled with care and added post-sterilization to minimize degradation and waste. Specific additives for this item: Not specified; refer to CoA/Spec Sheet.

Comparison to alternatives:

• Ready-to-use plates vs. in-house prep: In-house reconstitution can reduce shipping weight/volume and packaging, but requires autoclave energy; ready-made plates reduce on-site energy but increase packaging and transport emissions. Balance based on throughput and infrastructure.

Documentation and QA:

• Maintain preparation logs to minimize batch failures (reduces repeat sterilizations and waste).

Pharmaceutical Uses

This product is supplied as BioReagent grade for research use only and is not intended for diagnostic, therapeutic, or GMP-manufacturing purposes.

Typical roles of differential media in pharma/biotech research workflows (literature, general):

• Environmental monitoring studies and method development (non-GMP research settings) where differentiation aids presumptive identification during feasibility work.
• Strain screening in microbial fermentation R&D to select phenotypes prior to quantitative assays.
• Teaching/training labs for personnel competency development on differential microbiology techniques.

Regulatory and quality notes:

• Not certified to pharmacopeial monographs unless explicitly stated. For this item, pharmacopeial status: Not specified for this item; refer to CoA/Spec Sheet.
• For QC/lot release in regulated environments, use qualified, compendial media and validated methods as required by your quality system.

Always confirm suitability via internal qualification with relevant test organisms before use in any regulated study. For research use only, per manufacturer.

Physical Properties

• State: Dehydrated culture medium (powder/granules typical for media); Appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Solubility: Readily soluble in purified water (general for dehydrated microbiological media); exact solubility Not specified for this item; refer to CoA/Spec Sheet.
• pH (at working concentration): Not specified for this item; refer to CoA/Spec Sheet. Many differential media operate near neutral pH, e.g., ~6.8–7.4 (literature, general guidance).
• Density/bulk density: Not specified for this item; refer to CoA/Spec Sheet.
• Refractive index, logP, pKa, UV cutoff, conductivity: Not applicable or not meaningful for an undefined mixture; Not specified for this item; refer to CoA/Spec Sheet.
• Melting/boiling point: Not applicable as a multi-component solid blend; Not specified for this item; refer to CoA/Spec Sheet.
• Hygroscopicity: Many dehydrated media are moderately hygroscopic (literature, general). Handle in low-humidity conditions to maintain performance.

Notes for use (general, literature):

• Working concentration is defined by the manufacturer’s label (g/L). For this item: Not specified; refer to label/CoA.
• Final medium clarity and color depend on formulation and indicator system; color shifts during incubation reflect differential reactions.

Quality and Grades

• Item grade: BioReagent

  • Meaning (general): Suitable for biological research applications, with manufacturing controls geared to consistency, low bioburden, and performance in culture systems. Not produced under GMP unless explicitly stated; not for diagnostic or clinical use.

• What this implies for SDM:

  • Formulation is intended to deliver reproducible differential performance across lots when prepared as directed.
  • Typical controls for BioReagent-grade media include verification of pH at working concentration, clarity, and growth/differential response with designated control strains (performance testing). Specific acceptance criteria: Not specified for this item; refer to CoA/Spec Sheet.

• Purity/contaminant specifications (metals, endotoxin, etc.): Not specified for this item; refer to CoA/Spec Sheet.

• Stabilizers/indicators: Many differential media contain pH or chromogenic indicators and selective agents (literature, general). Presence and identity for this item: Not specified for this item; refer to CoA/Spec Sheet.

• Documentation to consult:

  • Certificate of Analysis (lot-specific pH, performance testing).
  • Product Specification Sheet (recommended preparation, g/L, sterilization guidance).

• Practical quality tips:

  • Use Type I/II water and calibrated balances.
  • Mix thoroughly; avoid localized overconcentration that can impact indicator response.
  • Record lot numbers; verify expected color/response with control organisms on first use of a new lot.

Reaction and Applications

SDM is intended for microbiological differentiation, enabling visible discrimination of organisms based on specific metabolic activities. While not a chemical reagent for organic synthesis, it is central to biological “reactions” performed by microbes.

Representative applications (literature, general for differential media):

• Differentiation based on carbohydrate fermentation with pH indicators (acid production yields color change).
• Detection of enzyme activities (e.g., decarboxylation, deamination, hydrolases) using chromogenic or pH-responsive systems.
• Observation of colony morphology, precipitation, or halos around colonies due to substrate utilization.
• Presumptive identification workflows in basic research, teaching labs, and strain development.

Practical tips:

• Prepare plates/broth exactly at the labeled g/L; deviations can suppress or exaggerate differential responses. For this item: Not specified; refer to CoA/Spec Sheet.
• Verify expected control outcomes using reference strains to qualify each new lot and batch.
• Control incubation variables: temperature, atmosphere (aerobic/anaerobic), and time critically affect phenotype expression.
• If selective agents are included, observe proper aseptic addition after sterilization to preserve activity (general guidance).

Limitations:

• Differential media provide presumptive results; confirm with biochemical/ molecular assays as appropriate for research. Composition details and specific indicator chemistry for this product are Not specified; refer to CoA/Spec Sheet.

Reaction Conditions

In the context of microbiology, “reaction conditions” correspond to culture and incubation parameters rather than chemical reaction kinetics. Exact parameters for SDM are Not specified for this item; refer to CoA/Spec Sheet. General guidance (literature):

• Preparation: Reconstitute at the labeled concentration (g/L), heat to dissolve if permitted, and sterilize (commonly autoclave 121 °C, 15 min) unless the Spec Sheet directs alternative sterilization. Add heat-labile supplements by sterile filtration after cooling to ~45–50 °C for agar media.
• Plating: For agar-containing media, pour plates at ~50–55 °C to minimize condensation and maintain indicator integrity.
• Incubation: Temperature and atmosphere depend on target organisms (e.g., many mesophilic bacteria at 30–37 °C; aerobiosis/anaerobiosis as appropriate). Time frames typically 18–48 h but vary by organism and assay.
• Readout: Observe characteristic color/halo/precipitate changes associated with differential components. Use control strains to validate the expected responses.

Note: These are literature-based general conditions for differential media. Follow the product’s Specification Sheet and institutional SOPs for definitive instructions.

Safety and Handling

Follow standard microbiological media handling practices. SDS is the authoritative source for hazard data.

• GHS classification: Not specified for this item; refer to SDS.
• Signal word / H-statements / pictograms: Not specified for this item; refer to SDS.
• Primary hazards (general for dehydrated media): Low intrinsic chemical hazard; main risks arise from microbiological use (exposure to cultured organisms) and dust inhalation. Avoid aerosolization.
• PPE: Lab coat, safety glasses, nitrile gloves; respiratory protection if dust may be generated (per institutional risk assessment).
• Engineering controls: Prepare in a clean area; use biosafety cabinet when handling pathogenic strains. Autoclave waste and used plates/broths.
• Incompatibilities: Store away from strong oxidizers and moisture. Do not mix with incompatible disinfectants before autoclaving (general lab hygiene guidance).
• First aid (general):
  • Inhalation: Move to fresh air; seek medical attention if irritation persists.
  • Skin: Wash with soap and water; remove contaminated clothing.
  • Eyes: Rinse with water for several minutes; remove contacts if present and easy to do; seek medical attention if irritation persists.
  • Ingestion: Rinse mouth; do not induce vomiting; seek medical attention as needed.
• Microbial biosafety: Follow organism-appropriate BSL procedures. Decontaminate spills with suitable disinfectant; autoclave all biological waste.

Always consult the product SDS and institutional biosafety guidelines before use.

Solvent Selection

As a dehydrated culture medium, SDM is reconstituted in purified water; organic solvent selection is not applicable.

• Primary “solvent”: Water (Type I or II per ASTM/CLSI). Avoid high TOC or ionic contaminants that alter buffering or indicator equilibria.
• Water quality considerations (literature, general):
  • Resistivity ≥ 1–10 MΩ·cm (Type II–I);
  • Low TOC (<50 ppb for Type I) to minimize microbial growth and indicator background;
  • 0.2 µm filtration if using non-sterile source water before sterilization.
• Miscibility: Fully miscible; reconstitution is aided by gradual addition under stirring at room temperature with gentle heating if allowed by the Spec Sheet (for this item: Not specified; refer to CoA/Spec Sheet).

Comparison (general):

• Distilled vs. deionized water: Both acceptable if final purity meets Type II or better; DI with polishing cartridge often preferred for consistency.
• Buffered saline vs. water: Use plain water unless the Spec Sheet directs otherwise; adding salts pre-sterilization can shift pH/ionic strength and invalidate performance tests.

When to choose alternatives:

• If using heat-labile supplements (antibiotics, chromogens), reconstitute SDM in water, autoclave if indicated, then aseptically add sterile-filtered supplements after cooling (literature, general). Exact supplement requirements for this item: Not specified; refer to CoA/Spec Sheet.

Storage and Reconstitution

• Storage conditions (as provided): Room temperature. Keep container tightly closed, dry, and protected from humidity and light. Avoid temperature extremes that promote caking or indicator degradation.
• Shipped in: Normal conditions (per product data).
• Shelf life: Not specified for this item; refer to CoA/Spec Sheet.

Reconstitution and sterilization (general, literature):

• Use freshly produced Type I/II water. Accurately weigh the manufacturer-recommended grams per liter (for this item: Not specified; refer to label/Spec Sheet).
• Dissolve with stirring; gentle heating may assist. Do not overheat if medium contains heat-sensitive components.
• Sterilize as directed (commonly autoclave 121 °C, 15 min). Alternatively, sterile-filter heat-labile media through 0.22 µm membranes if specified.
• If preparing agar plates, cool molten medium to ~50–55 °C before pouring. For broth, cool to room temperature before use.

Post-preparation handling:

• Store poured plates in sealed sleeves at 2–8 °C, inverted to minimize condensation (if medium permits; confirm on Spec Sheet). Typical in-use plate shelf life varies and is Not specified for this item; refer to CoA/Spec Sheet.
• Store prepared broth at 2–8 °C and use promptly; inspect for turbidity or precipitates before use.

Research Use Note: For research use only.

Structure and Identity

Stantz Differential Medium (SDM) is a complex, multi-component microbiological growth medium formulated for differentiating organisms based on biochemical traits. It is not a single defined chemical substance; therefore, single-molecule identifiers do not apply.

• Compound type: Dehydrated microbiological medium (complex mixture)
• Intended use: Differential culture medium for research microbiology
• Molecular formula: Not applicable for a mixture; Not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight: Not applicable for a mixture; Not specified for this item; refer to CoA/Spec Sheet.
• SMILES / InChI / InChIKey: Not applicable to complex mixtures; Not specified for this item; refer to CoA/Spec Sheet.
• Structural features (descriptive): Typically comprises a blend of peptone/enzymatic digests, salts/buffers, carbohydrates or other substrates, and pH/indicator dyes that enable visual differentiation (literature, general for differential media). Exact composition for this product is Not specified for this item; refer to CoA/Spec Sheet.
• Form: Dehydrated powder or granules expected for culture media; Appearance: Not specified for this item; refer to CoA/Spec Sheet.

2D “structure” context: Because SDM is a formulation, not a discrete molecule, it contains multiple functional classes (peptides/amino acids, electrolytes, potential redox or chromogenic indicators). Any 2D depiction would be representative only and is not applicable to the product as-supplied.

Synthetic Utility

Not applicable. SDM is a biological culture medium rather than a chemical building block or reagent for organic synthesis. For chemical synthesis guidance, consult reagents designed for synthetic transformations.

Target Specificity

Not applicable. SDM is not an antibody, enzyme, or affinity reagent with defined molecular targets. Its “specificity” is functional: it differentiates organisms based on metabolic traits encoded by the medium’s formulation. Specific target organisms or markers for this item are Not specified; refer to CoA/Spec Sheet.

자주 묻는 질문

How should this product be stored?

Store at room temperature.