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Name: Deoxyribonuclease I (DNase I)
Common Uses: Breaks down DNA in laboratory protocols, preps tissues, works in molecular biology research
Physical Form: Powder, lyophilized cake, or as a solution, varying by vendor
Primary Source: Often sourced from bovine pancreas or recombinant systems
Primary Audience: Laboratory staff, life science researchers, biotechnology sectors
Overall Classification: Generally not seen as hazardous under normal conditions for laboratory use, but exposure causes local irritation
Toxic Effects: Dust or solution splashes irritate eyes and respiratory tract, skin contact leads to mild irritation, rare severe reactions for enzyme allergies
Target Organs: Skin, eyes, respiratory mucosa
NFPA Labels: Minimal fire, health, and reactivity risks under regular handling
Main Ingredient: Deoxyribonuclease I enzyme
Potential Additives: Trace buffer salts, stabilizers for commercial lots, possible protein contaminants with impure preparations
CAS Number (for reference): 9003-98-9
Impurities: Host cell proteins, very low if produced by recombinant means
Eye Contact: Flush with plenty of water, encourage prompt ophthalmology consult if irritation does not resolve
Skin Contact: Wash exposed area with soap and water, remove contaminated clothing
Inhalation: Move to fresh air, medical attention recommended for persistent symptoms like coughing or breathing difficulty
Ingestion: Rinse mouth, seek medical advice if large volumes involved or symptoms occur
Allergic Reactions: Rare, but for those with enzyme sensitivities, watch for hives, swelling, or difficulty breathing, activate emergency protocols
Suitable Extinguishers: Water spray, dry chemical, or carbon dioxide works if packaging or nearby combustibles ignite
Combustion Products: Burning produces carbon oxides and nitrogen oxides at high temperature
Protection for Firefighters: Standard self-contained breathing apparatus protects from fumes and thermal breakdown products
Risks: DNase I itself is not flammable, but packaging and storage media may burn and release irritants
Personal Precautions: Wear gloves, lab coats, goggles, and masks to avoid contact with eyes, skin, and lungs, especially in powder form
Spill Clean-up: Wet wipe the area gently to minimize dust, use absorbent material for solutions, dispose into biohazard waste
Ventilation: Work in a hood if possible, keep bystanders away during cleanup
Environmental:** Avoid releasing large amounts into drains or sinks to prevent protein buildup in plumbing
Handling Practices: Work carefully, especially during lyophilized powder manipulations, always recap vials and avoid generating airborne particles
Storage Conditions: Store at recommended temperatures, usually –20°C or colder; keep dry and protected from light and humidity to maintain enzyme activity
Incompatibilities: Strong acids, oxidizing agents, and prolonged exposure to room temperature destroy activity
Engineering Controls: Biosafety cabinet or chemical fume hood reduces potential aerosol exposure
Personal Protective Equipment: Gloves, eye protection, and lab coats are a must, especially with open containers
Respiratory Protection: Use masks or particulate respirators if dusts or aerosols are likely
Hygiene Tips: Do not eat, drink, or smoke in work area, wash hands thoroughly after handling
Appearance: White to off-white powder, crystalline or as pellets; solutions are clear, often colorless
Solubility: Soluble in aqueous buffers, activity lost in organic solvents
Odor:** Odorless
Molecular Weight: Around 30,000 Daltons, depending on origin
pH Range: Stable and active usually near neutral pH
Stability: Stable under frozen, dry, and dark storage conditions; activity drops with warm or moist environments
Reactivity: Reacts with oxidants, acids, and proteases; denaturation from heat and extreme pH
Hazardous Decomposition: No hazardous breakdown in typical lab conditions, but combustion releases toxic fumes
Polymerization:** Will not occur
Acute Toxicity: Data in humans is limited; eye and respiratory tract irritation seen with powder, rare mild allergic skin reactions in sensitized individuals
Chronic Effects: Repeated exposure creates risk of sensitization, mostly among workers with long-term exposure to protein dusts
Carcinogenicity, Mutagenicity, Reproductive Effects: No evidence or data supporting carcinogenic, mutagenic, or reproductive toxicity for DNase I
Special Populations: Atopic individuals, those with enzyme/protein allergies watch for rare systemic reactions
Persistence and Degradability: Biodegrades rapidly, as it is a natural protein and substrate for soil microbes
Bioaccumulation: Does not accumulate in living organisms
Aquatic Toxicity: Negligible impacts expected at laboratory disposal levels, but best to avoid direct release
Best Disposal Practice for Laboratory Settings: Send all waste and cleanup residues to biohazard or protein waste streams, even though risks are low
Product Waste: Dispose of vials, pipette tips, and solutions as laboratory biohazard waste, particularly if contaminated with biological samples
Recommended Methods: Incineration or steam autoclaving as local regulations dictate
Avoid: Pouring concentrated solutions or powders into sinks
Packaging Disposal: Cardboard, plastic, and glass disposed under local chemical or biological waste rules
Transport Classification: Not regulated as a dangerous good for land, sea, or air, but sensible packaging avoids breakage and powder release
Packing Practices: Double containment improves safety especially for air shipping, using insulated boxes for dry ice if frozen
Labels: Standard “biochemical, not hazardous” or “non-hazardous enzyme” designations suitable but always confirm destination country rules
Major Regulations: Not listed under hazardous substance categories by OSHA, IARC, ACGIH, or EU directives
Country Variations: Europe’s REACH legislation does not restrict typical laboratory use; US, Canada, Australia, and most Asian countries treat as a non-restricted reagent
Lab Rules: Individual institutions create stricter internal policies, especially for protein-dust allergies or sensitive research groups
