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Substance name: Cytochrome C
Chemical nature: Small heme protein usually found loosely associated with the inner membrane of the mitochondrion
Uses: Often chosen for research on electron transport, mitochondrial function, and cell apoptosis
Common forms: Frequently encountered as a lyophilized powder or aqueous solution, typically sourced from equine heart tissue
Appearance: Tends to present as a dark red-brown solid or slightly opaque solution due to its iron-heme complex
Odor: Usually odorless or very faintly organic in well-sealed containers
Molecular formula: C42H52FeN10O8S2 for the protein with a single heme group
CAS Number: 9007-43-6
Classification: Not considered hazardous in small laboratory quantities under standard regulatory guidelines
Main risks: May cause mild skin or eye irritation if mishandled, especially in prolonged or direct contact
Signal word: None assigned under GHS in lab settings
Pictograms: Often not required by regulatory agencies due to low acute toxicity
Potential Health Effects: Inhalation or ingestion is unlikely in most laboratory settings; generally, risks come from handling fine powders or accidental splashes
Active component: Cytochrome C protein, frequently over 95% purity for research
Impurities: Usually minor, consisting of trace buffer salts, possibly preservative agents if in solution
Preservative agents: Occasionally includes sodium azide (a known toxin) in commercial solutions—always check the label
Inhalation: Remove from exposure, seek fresh air. Provide comfort and seek medical advice if symptoms persist
Skin contact: Wash area thoroughly with soap and water; remove contaminated clothing
Eye contact: Flush with running water for at least fifteen minutes. Eyewash stations are essential in any facility handling biological proteins
Ingestion: Rinse mouth, drink water, and seek medical attention if a substantial amount is consumed, which is unlikely in most labs
Chronic exposure: Not reported by major health agencies at the low exposure levels used in the laboratory
Suitable extinguishing media: Water spray, dry chemical, carbon dioxide, foam—all effective for protein-based combustibles
Hazardous combustion products: May generate carbon oxides, sulfur oxides, nitrogen oxides in a fire—use exhaust ventilation or respiratory protection
Fire hazards: Protein powders such as lyophilized Cytochrome C can contribute to fine dust clouds that may burn if ignited by high heat
Recommendations: Wear self-contained breathing apparatus and protective gear during extinguishing; avoid directly inhaling smoke or fumes
Spill handling: Avoid raising dust, ventilate area well and clean up using a damp cloth or filtered vacuum
Personal protection: Gloves and lab coats prevent unnecessary contact
Small spills: Can be mopped up with absorbent material, later discarded according to institutional policies
Larger releases: Collect spilled material, place in approved container for waste disposal
Handing: Limit unnecessary dust formation or aerosolization. Wear gloves to prevent skin contact
Precautions: Work in well-ventilated areas or use biological safety cabinets
Storage: Store lyophilized Cytochrome C at low temperatures (often -20°C or colder) and protect from light
Container integrity: Keep tightly sealed to maintain protein activity and prevent contamination
Labeling: Ensure clear identification in shared spaces due to the potential allergenic nature of foreign proteins
Exposure limits: No established occupational exposure limits; standard lab hygiene suffices
Engineering controls: Fume hood or ventilated bench strongly recommended for powder handling
Personal protection: Gloves, lab coat, safety goggles—basic PPE for most handling tasks
Hygiene: Wash hands after handling, avoid hand-to-face contact during work
Environmental controls: Prevent uncontrolled release into the environment—especially solutions containing preservatives or buffer salts
State: Solid (lyophilized) or aqueous solution
Color: Red to brown, distinctive due to iron-heme
Odor: Often imperceptible
Solubility: Highly soluble in water, insoluble in organic solvents
Molecular weight: Approximately 12,384 Da
Boiling/melting point: Not meaningful for proteins; denatures at high temperatures
pH stability: Functional stability best near neutral pH, rapid denaturation under acidic or basic extremes
Chemical stability: Stable in a well-sealed vial, kept cold and dry
Reactivity: Can undergo denaturation by heat, strong acids, bases, oxidizers, or proteases
Hazardous reactions: Unlikely in normal lab environments; avoid contact with strong reducing agents or oxidizers
Acute toxicity: Not reported to cause acute toxic effects at laboratory exposure levels
Inhalation risks: Minimal; avoid inhaling powders
Skin/eye contact: May cause slight irritation in sensitive individuals; universal precautions reduce these risks
Chronic effects: No known chronic health effects in routine lab or educational exposures as reported in scientific literature
Sensitization: Potential exists with repeated exposure to biological materials; laboratory workers should monitor for allergic reactions
Persistence/degradability: Rapidly degrades by microbial/enzymatic action in wastewater and natural waters
Aquatic toxicity: Not expected to be ecotoxic at quantities used in research; caution advised for solutions containing toxic preservatives
Bioaccumulation: Not an issue due to rapid degradation pathways
General disposal: Autoclave or chemically decontaminate biological waste before disposal in line with institutional biosafety protocols
Larger quantities: Treat as laboratory waste and engage with hazardous waste disposal companies
Container disposal: Decontaminate before discarding by soaking in a disinfectant, especially if containing sodium azide or other preservatives
Regulation: Not classified as hazardous for transportation by most agencies at laboratory volumes
Conditions: Ship under dry ice or cold packs if required for stability; maintain sealed packaging
Labeling: Include proper warnings if containing toxic buffers or preservatives
Safety regulations: Federal and local laboratory safety protocols dictate basic requirements for labeling, PPE, containment, and record-keeping
Global guidelines: Most agencies agree cytochrome C is non-hazardous at laboratory scale but require specific handling for protein allergenicity and preservatives
Biosafety guidance: Institutional biosafety committees often categorize Cytochrome C under low-risk biological materials; local guidelines may still dictate waste and storage precautions
Other: Frequent review of safety practices stands as good practice, especially when introducing new users or scaling up quantities
