Sudan Ⅲ Staining Kit - BioReagent, Biological Stain, for microscopy, high purity

Cat. No.: S774836

GRADE & PURITY BioReagent, Biological Stain, for Microscopy

Specifications

Specifiche e purezza

BioReagent, Biological Stain, for microscopy

Grado

Biological Stain, BioReagent, per la microscopia

Sensibilità

Light-sensitive

Stoccaggio e spedizione

Condizioni di conservazione di stoccaggio

Protected from light,Room temperature

Spedito in

Normal

Stabilità e conservazione

Store at room temperature long term (12 months). Store in the dark.

Application Protocols

Item-specific, validated protocols for this kit are Not specified for this item; refer to the kit insert/CoA for definitive instructions. The following is a general Sudan III workflow for research use, provided for context only.

Typical Sudan III staining of cryosections (literature/general):

1. Prepare sections: Cut cryosections (e.g., 6–10 µm) and air-dry. Optional brief fixation in buffered aldehyde; avoid dehydrating solvents that extract lipids.
2. Equilibrate: Bring slides and staining solution to room temperature; protect from light.
3. Stain: Immerse slides in Sudan III working solution (alcohol-based) until lipid droplets appear distinctly orange–red under quick microscopic check; avoid excessive times that raise background.
4. Differentiate: Rinse briefly in the carrier solvent or a specified aqueous–alcohol differentiator to remove surface-bound dye while retaining lipid coloration.
5. Counterstain (optional): Apply a compatible aqueous nuclear counterstain to improve contrast (counterstain not specified for this item).
6. Rinse and mount: Rinse gently; mount with a medium compatible with lipids and residual solvent.

Controls and QA:

• Include a positive control tissue with known lipid droplets and a negative control processed without dye.
• Standardize timing between batches; record temperature, section thickness, and fixation details for reproducibility.

Troubleshooting (general):

• Weak staining: Verify dye clarity (filter if necessary), reduce pre-stain solvent exposures, confirm section integrity.
• High background: Shorten stain time, extend differentiation slightly, ensure slides are fully submerged and agitated gently.

Biological Roles

Sudan III is not a biological metabolite; it serves as an exogenous probe to visualize neutral lipids.

• Targeted structures (literature/general):

  • Neutral lipids: triglycerides and cholesteryl esters within lipid droplets and fat vacuoles.
  • The dye partitions into hydrophobic phases via solvophobic interactions rather than specific binding to functional groups.

• Mechanistic notes (biochemistry context):

  • Lysochrome dyes exhibit color due to extended azo-conjugation; in nonpolar environments, their electronic transitions can shift slightly (solvatochromism), often producing more intense orange–red hues in lipid droplets compared with alcoholic medium.
  • Because no covalent labeling occurs, the signal reflects lipid abundance and accessibility at the time of staining; fixation and processing strongly influence outcomes.

• Sample types (research use only):

  • Cryosections of adipose-rich tissues, liver, muscle; cytospins and smears; cultured cells with induced lipid accumulation.
  • Non-biological matrices: food emulsions, oils, and particulates where fat detection is of interest.

• Limitations and cross-reactivity (general):

  • Poor staining of phospholipids and free cholesterol relative to triglycerides/esters; excessive solvent exposure can extract lipids, reducing signal.
  • Proteinaceous backgrounds can retain faint dye films if differentiation is incomplete.

All uses are for research and laboratory purposes only; not for diagnostic or therapeutic applications.

Buffer Applications

This product is a lipid-staining kit and is not intended as a buffering reagent.

• Applicability:

  • Buffers may be used adjacent to staining steps (e.g., for fixation, washing, or counterstaining), but the dye itself is delivered in organic media rather than aqueous buffers.

• Recommendation:

  • Consult the kit insert for any specified buffer compositions and pH ranges used for rinsing or counterstain steps. Item-specific buffer formulations are Not specified for this item; refer to CoA/Spec Sheet.

Green Alternatives

While Sudan III staining traditionally uses organic solvents, greener choices can reduce hazard without compromising performance.

• Opportunities for greener practice (general guidance):

  • Prefer ethanol or isopropanol over xylene-based carriers for lower toxicity and better biodegradability.
  • Use citrus terpene (d-limonene) or aliphatic hydrocarbon clearing substitutes in place of aromatic hydrocarbons when compatible with your protocol.
  • Minimize dye concentration and exposure time to reduce solvent usage and waste.
  • Implement closed staining jars and fume hood capture to limit VOC emissions.

• Comparison (general; literature context):

  • Ethanol carrier: Low toxicity profile, fully miscible with water for controlled differentiation; rapid drying; renewable bio-ethanol options available.
  • Isopropanol carrier: Similar performance with slightly slower evaporation; often less regulated; good compromise for bench-top work (still flammable).
  • Xylene-type carrier: Strong solvency but higher toxicity and VOC impact; generally avoided when alcohol-based protocols are effective.
  • Limonene substitutes: Reduced toxicity/odor vs xylene; may leave residues—verify compatibility with mounting media.

• Waste management:

  • Segregate dye-containing organic waste for solvent recovery where available. Activated carbon filtration can reduce dye load in small-volume rinses prior to disposal (subject to local regulations).

Note: The solvent system of this specific kit is Not specified for this item; refer to CoA/Spec Sheet before implementing substitutions.

Pharmaceutical Uses

This product is supplied strictly for research use only.

Non-clinical, laboratory-adjacent uses (general):

• Process development and teaching labs: Qualitative visualization of neutral lipid content in research tissues or cell-based models relevant to lipid metabolism studies.
• Raw material or formulation screening (bench-scale): Rapid, non-validated indication of fat/oil presence in excipients or cosmetic bases during exploratory work. Not suitable for GMP release testing or any clinical QC.

Regulatory/compendial status:

• No pharmacopeial monograph or excipient status for the kit is provided here. Any compliance claims (USP/EP/JP) are Not specified for this item; refer to CoA/Spec Sheet if applicable.

Cautions:

• Results are qualitative and protocol-dependent; they should not be used for batch disposition or specification release in regulated environments without appropriate validation.
• No diagnostic, clinical, or therapeutic use is intended or permitted.

Physical Properties

Item-specific specifications for physical properties of the kit components are not provided.

• Kit-level properties (this item):

  • Appearance: Not specified for this item; refer to CoA/Spec Sheet.
  • Storage: Protected from light; room temperature (per Product Data).
  • Shipping: Normal (ambient) conditions.

• Active dye (Sudan III) properties (literature, for context only — not item specifications):

  • Form: Reddish-orange powder; lysochrome (fat-soluble) dye.
  • Solubility: Practically insoluble in water; soluble in alcohols and many organic solvents (e.g., ethanol, isopropanol), and in nonpolar media and plasticizers; preferentially dissolves in neutral lipids due to hydrophobicity.
  • Acid/base: Nonionic dye; phenolic OH groups weakly acidic but dye is typically used in neutral/aprotic media.
  • Spectral: Strong visible absorbance in the orange–red region; solvatochromic behavior in lipid vs alcohol phases (literature).

• Working solution behavior (general practice):

  • Ethanol- or isopropanol-based staining solutions typically show good wetting and penetration of cryosections; dye may precipitate on long storage or after exposure to light/air — gentle warming and filtration through a fine PTFE membrane can restore clarity in many lab protocols (follow kit insert before attempting).

For authoritative numerical specifications (mp, bp, density, refractive index, UV cutoff, etc.) of any component in this kit, consult the product CoA/Spec Sheet and SDS.

Quality and Grades

• Item-specific grade (from Product Data):

  • Grade/Purity: BioReagent, Biological Stain, for Microscopy.

• What this grade implies (general guidance):

  • BioReagent: Suitable for biological laboratories and research workflows where reagent consistency and impurity control are important. Not intended for clinical diagnostics or therapeutic use.
  • Biological Stain, for Microscopy: Prepared and qualified for histological/cytological staining. Emphasis is placed on color strength, selectivity for target structures (neutral lipids for Sudan III), and low background under standard microscopy conditions.
  • Light protection: The product is to be protected from light, indicating sensitivity of the chromophore and/or working solutions to photodegradation; packaging often includes amber containers (consult CoA/label).

• Batch documentation:

  • Certificate of Analysis (CoA) typically includes appearance, performance checks (e.g., staining performance on control material), and any applicable spectroscopic criteria. Item-specific numeric specs (e.g., dye concentration, solvent composition, absorbance ratios) are Not specified for this item; refer to CoA/Spec Sheet.

• Stabilizers and additives:

  • Not specified for this item; refer to CoA/Spec Sheet. If present in the kit, stabilizers would be selected to preserve dye solubility and color fidelity without compromising lipid selectivity.

• Practical note:

  • For image analysis or comparative studies, maintain the same lot across an experiment series when possible, as slight differences in dye content or solvent strength can affect intensity and background.

Reaction and Applications

Chemical reaction use is not the focus for this product. Instead, its primary application is histological/cytological staining of neutral lipids.

Key laboratory applications (literature and best practice):

• Visualization of lipid droplets:
  • Staining of triglycerides and cholesteryl esters in cryosections, smears, and cultured cells. Often used in metabolic biology to assess adipogenesis and steatosis in research samples (research use only).
• Differentiation among tissue components:
  • Provides orange–red coloration of neutral lipids against lightly stained cytoplasm/nuclei (if a counterstain is used; counterstain not specified for this item).
• Teaching and quality control:
  • Rapid demonstration of fat in processed foods, oils, or environmental particulates on filter papers or smears.

Practical tips (general):

• Fixation: Use fixatives that preserve lipids (e.g., formalin for brief exposure or buffered aldehydes) and avoid harsh organic processing that extracts fats. Paraffin sections are typically unsuitable without special handling; cryosections are preferred.
• Section thickness: 6–10 µm cryosections commonly yield clear lipid droplets; thicker sections can appear muddy.
• Minimizing background: Thorough but brief rinses in the designated differentiating medium reduce non-specific coloration of proteins and membranes.
• Imaging: Use consistent white balance/filters; the dye exhibits slight solvatochromism—lipid-dissolved dye appears more intense than dye in alcohol films.

Always follow the kit’s validated protocol. Item-specific steps and timings are Not specified for this item; refer to CoA/Spec Sheet.

Reaction Conditions

Classical chemical reaction conditions are not relevant. Instead, typical staining conditions from the literature are summarized here for context; always prioritize the kit’s official protocol.

General Sudan III staining conditions (literature/guidance; not item-specific):

• Sample prep: Prefer cryosections (e.g., 6–10 µm) or smears to retain neutral lipids. Avoid prolonged exposure to organic solvents before staining to prevent lipid extraction.
• Staining medium: Alcoholic solutions (ethanol or isopropanol) carrying Sudan III; some protocols include controlled water content to balance solvency and contrast.
• Temperature and time: Room temperature; immersion times are typically brief, with optimization based on section thickness and fixation. Overstaining increases background; differentiation steps can reduce non-specific color.
• Rinsing/differentiation: Short rinses in the carrier solvent or aqueous–alcohol mixtures until background clears while lipid droplets remain vivid.
• Counterstains: Frequently paired with aqueous nuclear counterstains (e.g., hematoxylin variants) in general practice; specific counterstain use for this kit is Not specified for this item; refer to CoA/Spec Sheet.
• Mounting: Use mounting media compatible with residual organic solvent and lipid integrity; avoid prolonged exposure to strong lipid solvents during mounting.

Performance verification:

• Include a positive control slide containing known neutral lipid droplets to confirm staining efficacy and to standardize timing across batches.

Safety and Handling

Safety designations specific to this kit (GHS classification, signal word, H-statements, pictograms) are not provided here; refer to the SDS for each kit component for authoritative information.

General laboratory guidance for Sudan III staining systems (context; not a substitute for the SDS):

• Anticipated hazards:
  • Many Sudan III working solutions are alcohol-based and therefore flammable; keep away from ignition sources and use in a fume hood.
  • Azo dyes and solvent carriers can cause skin/eye irritation and may stain skin and laboratory surfaces; avoid contact and inhalation of mists/aerosols.
• PPE:
  • Wear lab coat, safety glasses or splash goggles, and appropriate chemical-resistant gloves (e.g., nitrile). Use additional eye/face protection when handling bulk solvents.
• Handling and hygiene:
  • Protect from light to minimize dye degradation. Keep containers tightly closed when not in use. Avoid generating aerosols; do not pipette by mouth. Wash exposed skin promptly.
• Incompatibilities (general):
  • Strong oxidizers; strong acids/bases that could degrade the dye; ignition sources (for alcohol/xylene-type carriers). Avoid contact with bleaching agents unless performing controlled differentiation per protocol.
• First aid overview:
  • Skin contact: Wash with soap and water. Eye contact: Rinse cautiously with water for several minutes; remove contact lenses if present and easy to do. Inhalation: Move to fresh air. Ingestion: Rinse mouth; seek medical advice in all cases.
• Spills and waste:
  • Absorb flammable solvent spills with inert material and dispose of as organic chemical waste. Collect dye-containing waste as hazardous according to institutional and local regulations.

Always consult the SDS supplied with the kit components before use.

Solvent Selection

This is a staining kit; users typically do not select solvents independently for the kit reagents. However, understanding solvent effects helps optimize performance and troubleshooting.

• Polarity and miscibility (general for Sudan III systems):

  • Sudan III is lipophilic and partitions into neutral lipid phases; it is typically delivered in alcohols (ethanol, isopropanol) or other organic carriers. Alcohols are miscible with water, facilitating controlled differentiation, while still solubilizing the dye.
  • In lipid-rich matrices, the dye preferentially dissolves into hydrophobic domains, enhancing contrast in cryosections and smears.

• Choosing carriers and rinses (literature/general practice):

  • Alcoholic carriers: Favor rapid wetting and penetration; ease of preparation; relatively low toxicity compared with chlorinated aromatics. Commonly coupled with brief aqueous or aqueous–alcohol differentiations to reduce background.
  • Nonpolar diluents/clearing agents (e.g., aliphatic hydrocarbons, limonene, xylene-type): Can intensify lipid solubilization but at the cost of higher volatility/toxicity and extraction of lipids if overexposed. Use with caution and per validated protocols.
  • Aqueous buffers: Generally poor solvents for Sudan III; useful mainly for counterstaining and rinsing steps, not for dye delivery.

• Comparison snapshot (general):

  • Ethanol vs isopropanol carriers: Ethanol affords faster evaporation and crisper endpoints; isopropanol can maintain wet films longer, aiding uniform staining on larger slides.

Follow the kit insert for the designated solvent system; do not substitute carriers unless validated in your lab.

Storage and Reconstitution

• Storage conditions (item-specific):

  • Store protected from light at room temperature (per Product Data). Keep containers tightly closed to minimize solvent evaporation and dye photodegradation.

• Shipping: Shipped under normal ambient conditions.

• Reconstitution/use:

  • Whether this kit contains ready-to-use solutions or concentrates is Not specified for this item; refer to CoA/Spec Sheet and the kit insert for exact directions.
  • If concentrates are supplied (general guidance), prepare working solutions with the specified solvent (commonly alcoholic) in clean amber glassware; mix thoroughly and allow any microbubbles to dissipate before use. Filter through a 0.2–0.45 µm PTFE membrane if particulate is observed, unless the kit instructs otherwise.

• Handling to preserve performance:

  • Minimize light exposure during storage and use (use amber bottles, cover staining jars with foil when practical).
  • Avoid temperature extremes; do not freeze unless explicitly instructed in the kit documentation.
  • Record the date of opening; many dye solutions show gradual performance drift due to solvent loss or photo-oxidation. Prepare fresh working aliquots as needed.

• Stability:

  • Specific shelf life, retest dates, and in-use stability are Not specified for this item; refer to CoA/Spec Sheet.

Always consult the SDS and kit insert for authoritative handling and preparation instructions.

Structure and Identity

This product is a microscopy staining kit centered on the classic lysochrome dye Sudan III for selective visualization of neutral lipids.

• Item-specific identifiers (kit):

  • SKU: S774836
  • Product name: Sudan Ⅲ Staining Kit
  • CAS / InChIKey / SMILES / Molecular formula / Molecular weight: Not specified for this item; refer to CoA/Spec Sheet.

• Active dye (Sudan III) identifiers (literature; for context only — the kit may include solvents/additives):

  • Common class: Azo lysochrome (fat-soluble) dye
  • Structural features (2D description, literature): Disazo scaffold linking substituted naphthol/naphthyl rings; extended conjugation confers intense orange–red color; phenolic OH capable of H-bonding; overall nonionic, highly lipophilic character.
  • Functional groups (literature): Two azo (–N=N–) linkages; phenolic hydroxyls; aromatic rings.

• Structural rationale (general knowledge):

  • The lipophilicity of Sudan III drives partitioning into neutral lipid phases (triglycerides, cholesteryl esters) within cells/tissues, giving strong contrast without ionic binding chemistry.

Notes:

• Because this is a kit, exact component identities, concentrations, and any counterstains or differentiators are not specified here; consult the kit insert/CoA for definitive composition.

Synthetic Utility

Not typically applicable.

• Rationale:

  • Sudan III staining kits are formulated for microscopy workflows, not as synthetic reagents or building blocks. The dye is used as a physical partitioning probe into lipid phases rather than as a reactant or catalyst.

• If chemical modification is desired (research-only):

  • Any derivatization of azo dyes for alternative spectral properties or immobilization would be outside the intended use of this kit and should be sourced as dedicated dye intermediates, not from a formulated staining kit.

Target Specificity

This product is a chemical staining kit (not an antibody), so immuno-specific attributes (antigen, clone, isotype, species reactivity) do not apply.

Functional specificity (literature/general for Sudan III):

• Primary targets: Neutral lipids — triglycerides and cholesteryl esters.
• Mechanism: Partitioning/solvation into hydrophobic domains (lipid droplets) rather than specific covalent binding or ionic interactions.
• Off-target/background: Weak association with hydrophobic protein regions and membranes can occur if differentiation is insufficient, causing light background coloration.

Note: Any enhancements to selectivity via proprietary solvents, additives, or counterstains in this kit are Not specified for this item; refer to CoA/Spec Sheet.

Domande frequenti

How is this product shipped?

This product ships under standard ambient conditions. No temperature-controlled packaging is required.