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Chemical Name: L-Histidine
Synonyms: α-Amino-1H-imidazole-4-propionic acid
Chemical Formula: C6H9N3O2
CAS Number: 71-00-1
Appearance: Typically a white crystalline powder, often odorless to the average person
Common Uses: Dietary supplementation, biochemical research, pharmaceutical manufacturing
Classification: Not classified as hazardous under standard chemical regulations
Physical Hazards: Dust can become airborne, causing mild respiratory irritation if inhaled in confined or dusty spaces
Health Risks: Ingestion at dietary levels carries minimal risk, but large exposures could provoke gastrointestinal upset
Symbol: No GHS symbol required due to low acute toxicity
No chronic effects: No reports suggest chronic harm under typical usage as a supplement or lab reagent
Main Component: Pure L-Histidine, typically above 98% purity
Impurities: Trace inorganic salts may appear if synthesized or purified incompletely, though most commercial batches aim for near-complete purity
No mixture: Most containers provide L-Histidine in its pure or nearly pure form
Inhalation: Move to fresh air, rinse mouth if dust is tasted, and seek care if cough or discomfort lingers
Skin Contact: Rinse with water and mild soap, especially after extended contact, as dried residue may rarely irritate sensitive skin
Eye Contact: Flush eyes with plenty of water, as even mild powders can scratch or irritate
Ingestion: Rinse mouth and drink water; medical advice typically unnecessary for small accidental exposures as the human body recognizes the compound
Flammability: L-Histidine itself resists ignition, but dust clouds in air can present a risk under very strong heat or spark presence
Suitable Extinguishing Media: Water spray, dry chemical, or CO2; pick what matches surrounding materials
Special Hazards: Combustion could generate nitrogen oxides and carbon monoxide, substances that should not escape unnoticed in a sealed lab or warehouse
Protective Equipment: Firefighters put on respiratory protection in case of smoke or chemical vapor exposure
Personal Protection: Avoid breathing dust, use gloves if significant clean-up is needed, and ventilate storage or spill areas
Spill Cleanup: Avoid creating dust clouds, sweep up powder, and wash down surfaces as L-Histidine dissolves easily in water
Environmental Precaution: Keep large concentrations out of drains since nutrients can affect water biology in large amounts, though L-Histidine itself rarely poses a major environmental threat in realistic spill scenarios
Handling: Store in tightly closed containers, avoid working near food or sensitive electronics due to fine particle drift, and frequently wash hands after handling bulk powder
Storage: Place in cool, dry, and well-ventilated rooms, away from strong acids or bases to avoid unwanted chemical reactions that may happen with improperly stored amino acids
Engineering Controls: Local exhaust ventilation or a laboratory fume hood keeps dust low when handling larger quantities
Eye Protection: Safety glasses recommended while transferring or weighing bulk powder
Skin Protection: Standard laboratory gloves reduce skin exposure for those with sensitive skin or hands prone to dryness
Respiratory Protection: Face masks useful for those routinely working with hundreds of grams, but unnecessary for low-frequency handling
Physical State: Solid
Appearance: White, crystalline, slightly granular
Odor: Odorless or faint earthy odor
pH (1% solution): Mildly acidic, around 7.5–8.0 in neutral water due to its amphoteric nature
Solubility: Freely soluble in water, poorly soluble in ethanol and nearly insoluble in nonpolar solvents
Melting Point: Decomposes above 277°C, meaning high heat isn't practical for storage environments
Stability: Remains stable at room temperature, lost only through exposure to high humidity, light, or strong oxidizing agents
Incompatibility: Avoid strong oxidizers, acids, and bases which may damage its molecular structure
Hazardous Decomposition: In rare overheating situations, can produce irritating nitrogen oxides and carbon monoxide
Acute Oral Toxicity: Low, as the body metabolizes L-Histidine as a natural amino acid
Acute Inhalation Toxicity: Mild irritation, possible cough or runny nose with high airborne concentrations
Skin and Eye Contact: May produce mild, transient irritation, especially for those with sensitive skin
Chronic Exposure: No substantial evidence links chronic occupational or dietary exposure with lasting human health effects, as it is an essential amino acid consumed daily in protein
Aquatic Toxicity: Practically non-toxic in realistic concentrations, due to rapid breakdown and assimilation by bacteria or aquatic organisms
Persistence and Degradability: Readily biodegradable, not persistent in the environment
Bioaccumulation: Unlikely to bioaccumulate due to rapid metabolism
Disposal Techniques: Dispose in accordance with national or local regulations, preferably with general laboratory solid waste after dilution with water
Recycling/Reuse: Not practical outside controlled industrial settings
Sewer Disposal: Avoid pouring concentrated powder into drains to minimize nutrient spikes in local waterways
UN Classification: Not classified as a dangerous good
Special Handling: Protect containers from moisture and physical damage during shipment as caked powder reduces usefulness
Labels: General chemical or research supply label suffices, as no special warning symbols or hazardous packing paperwork accompanies small quantities
Regulatory Status: Not subject to special regulatory control in most regions as it carries no major acute or chronic hazards
Label Requirements: Standard chemical product identifiers suffice, with PPE icons useful for workplace reminders
Worker Guidelines: Agencies recommend gloves, goggles, dust control, and proper documentation for bulk handling, supporting a workplace safety culture consistent with responsible lab or industrial practices
