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Chemical Name: Thioflavin T
Common Synonyms: Basic Yellow 1, Basic Yellow T, ThT
Chemical Formula: C17H19ClN2S
Appearance: Yellow to green crystalline powder, often has a noticeable musty odor
Usage: Researchers use Thioflavin T in detecting amyloid fibrils and protein misfolding. Most of the time, it pops up in labs for fluorescence-based staining.
CAS Number: 2390-54-7
Main Hazards: Inhalation, ingestion, and skin contact bring a real risk of irritation to eyes, respiratory system, and mucous membranes. Longer exposure may intensify symptoms.
GHS Classification: Not every global regulator agrees, but many label it as an irritant. Some lists treat it as harmful if swallowed.
Emergency Overview: Yellow crystalline solid, avoid dust clouds. Noxious when burned, releases fumes of sulfur oxides and nitrogen oxides.
Signal Word: Warning signs matter, both on labeling and actual use. Irritation puts people at risk, and that’s a fact that shouldn’t be ignored.
Main Ingredient: Thioflavin T, concentration usually above 70% in standard laboratory supply
Other Components: May contain trace impurities from synthesis process, rarely above 1%.
Additives: Commercial bottles rarely hold stabilizers or buffers, the raw dye stands alone most of the time.
Eye Contact: Rinse thoroughly under running water for at least 15 minutes, and keep eyelids open.
Skin Contact: Wash with soap and water. Take off contaminated clothes and shoes.
Inhalation: Move person to fresh air, keep comfortable for breathing, and seek medical advice if symptoms show.
Ingestion: Rinse mouth with water. Do not induce vomiting. Medical help should follow exposure by mouth.
Symptoms to Watch For: Irritation, short breath, sneezing, stinging sensation. In rare cases, dizziness.
Suitable Extinguishing Media: Carbon dioxide, dry chemical powder, water spray, alcohol-resistant foam.
Specific Hazards: Burning can push out toxic fumes, including carbon monoxide, carbon dioxide, hydrogen chloride, and sulfur oxides.
Advice for Firefighters: Wear self-contained breathing apparatus, and protective gear. Tackle fire from upwind.
Explosion Risk: Powdered samples may create combustible dust clouds if disturbed.
Personal Precautions: Avoid breathing dust; ventilate area; use gloves, goggles, and dust mask or respirator.
Environmental Precautions: Don’t let Thioflavin T get into sewers or water bodies.
Clean-up Methods: Sweep up spills, keep the dust down by moistening the powder, collect in sealed containers for disposal. Wash area with copious amounts of water.
Handling: Work with good ventilation, wear suitable PPE including lab coat, gloves, and goggles. Don’t breathe in dust.
Storage: Keep bottles protected from light in tightly sealed containers. Optimal is a cool, dry place away from acids and strong oxidizers. Most laboratories set temperature control between two and eight degrees Celsius.
Incompatibilities: Avoid storing next to strong oxidizers and acids, which create added risk of reaction.
Engineering Controls: Fume hoods or local exhaust systems help keep dust at bay.
Respiratory Protection: In case of inadequate ventilation, use a NIOSH-approved dust respirator.
Eye Protection: Chemical splash goggles or safety glasses with side shields.
Skin Protection: Nitrile or latex gloves, full-sleeved clothing.
Hygiene Measures: Remove contaminated clothing immediately, wash hands before eating or drinking.
Appearance: Powder, yellow-green tint
Odor: Slight or none, hint of mustiness in some lots
Melting Point: Range from 230°C to 232°C with decomposition
Boiling Point: Breakdown occurs before boiling
Water Solubility: Soluble, often gives intense fluorescence in solution
Other Properties: Stable under normal lab conditions, light sensitive, non-volatile
Chemical Reactivity: Doesn’t react under standard temperature and pressure.
Conditions to Avoid: Strong light, heat, moisture, strong acids, and strong oxidizers.
Decomposition Products: Chlorides, sulfur oxides, nitrogen oxides can form on combustion or decomposition.
Polymerization: No known hazardous polymerization under lab conditions.
Routes of Exposure: Skin, eyes, respiratory tract, ingestion
Acute Effects: Irritation to eyes, nose, throat, stomach; coughing and sneezing if inhaled; nausea if swallowed.
Chronic Effects: Reliable data remains limited, but repeated contact can redden skin and mucous membranes.
LD50: little public data exists on precise LD50 for Thioflavin T in humans or experimental animals.
Sensitization: Risk remains low according to available records.
Aquatic Toxicity: Limited evidence suggests some risk to aquatic life, so careful waste control matters.
Mobility: Water-soluble, may move through water systems if spilled.
Persistence and Degradability: Stable in normal conditions, doesn’t break down easily in the environment.
Bioaccumulation: Little research, but repeated release into environment should be avoided.
Waste Treatment: Treat as hazardous chemical waste. Make sure to dispose through licensed chemical waste contractors.
Disposal in Waterways: Never pour solutions or solid waste into sink or drains.
Precautions: Use sealed, labeled waste containers, and keep logs of disposal if working in regulated settings.
Ground, Air, and Sea Transport: Most regulations allow shipping as a non-dangerous good, but care still matters due to irritation risk.
Packaging: Use tight containers, padding to prevent dust exposure en route.
Signage: Label shipments to alert handlers about contents and personal protection needed on contact.
Workplace Laws: Most government rules set basic exposure controls, but don’t list Thioflavin T among controlled carcinogens.
Labeling: Labs need to label clearly, keep safety data up to date, and train workers on correct procedures.
Special Local Rules: Some universities and public labs require extra documentation for dye use, storage, and disposal due to toxicity of related compounds.
