Name | 1,1-diphenyl-2-picrylhydrazyl |
---|---|
Synonyms |
DPPH radical
diphenylpicrylhydrazylfreeradical 2,2-Diphenyl-1-(2,4,6-trinitrophenyl)hydrazyl DPPH di(phenyl)-(2,4,6-trinitrophenyl)iminoazanium 1,1-Diphenyl-2-picrylhydrazyl Free Radical 2,2-Diphenyl-1-(2,4,6-trinitrophenyl)hydrazino Hydrazinyl, 2,2-diphenyl-1-(2,4,6-trinitrophenyl)- Diphenylpicrylhydrazyl. 1,1-Diphenyl-2-picrylhydrazyl radical 2,2-Diphenylpicrylhydrazyl 2,2-diphenyl-1-picrylhydrazyl 1-diphenyl-2-picrylhydrazyl EINECS 217-591-8 Diphenypicrylhydrazyl MFCD00007231 |
Description | DPPH (2,2-Diphenyl-1-picrylhydrazyl) is a stable free radical that can be used to measure the radical scavenging activity of antioxidants. The odd electron of nitrogen atom in DPPH is reduced by receiving a hydrogen atom from antioxidants to the corresponding hydrazine. DPPH method may be utilized in aqueous and nonpolar organic solvents and can be used to examine both hydrophilic and lipophilic antioxidants[1]. |
---|---|
Related Catalog | |
In Vitro | DPPH shows a strong absorption band at 517 nm due to its odd electron and solution appears a deep violet colour, the absorption vanishes as the electron pairs off. The resulting decolorization is stoichiometric with respect to the number of electrons taken up. The alcoholic solutions of 0.5 mM are densely colored and at this concentration, the Lambert-Beer law is obeyed over the useful range of absorption[1]. DPPH assay is a rapid, simple, inexpensive and widely used method to measure the ability of compounds to act as free radical scavengers or hydrogen donors, and to evaluate antioxidant activity of foods. It can also be used to quantify antioxidants in complex biological systems, for solid or liquid samples. This method is easy and applies to measure the overall antioxidant capacity and the free radical scavenging activity of fruit and vegetable juice. This assay has been successfully utilized for investigating antioxidant properties of wheat grain and bran, vegetables, conjugated linoleic acids, herbs, edible seed oils, and flours in several different solvent systems including ethanol, aqueous acetone, methanol, aqueous alcohol and benzene. It is a convenient method for the antioxidant assay of cysteine, glutathione, ascorbic acid, tocopherol and polyhydroxy aromatic compounds, for olive oil, fruits, juices and wines[1]. |
References |
Melting Point | 136-138ºC |
---|---|
Molecular Formula | C18H12N5O6 |
Molecular Weight | 394.318 |
Exact Mass | 394.078766 |
PSA | 140.70000 |
LogP | 5.97000 |
Appearance | green |
Storage condition | 2-8°C |
Water Solubility | Soluble in dimethyl formamide, ethanol, chloroform, ether, carbon disulfinde, acetone, oils, carbon tetrachloride, glacial acetic acid and toluene. Insoluble in water. |
Synonym:Hydrazyl, 2,2-Diphenyl-1-(2,4,6-Trinitrophenyl Section 2 - COMPOSITION, INFORMATION ON INGREDIENTS
Risk Phrases: 20/21/22 Section 3 - HAZARDS IDENTIFICATION EMERGENCY OVERVIEW
Harmful by inhalation, in contact with skin and if swallowed.The toxicological properties of this material have not been fully investigated. Potential Health Effects Eye: May cause eye irritation. Skin: May cause skin irritation. Ingestion: May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated. Inhalation: May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated. Chronic: No information found. Section 4 - FIRST AID MEASURES Eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid. Skin: Get medical aid. Flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Ingestion: Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water. Inhalation: Remove from exposure and move to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. Notes to Physician: Section 5 - FIRE FIGHTING MEASURES General Information: As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing Media: Use agent most appropriate to extinguish fire. Use water spray, dry chemical, carbon dioxide, or appropriate foam. Section 6 - ACCIDENTAL RELEASE MEASURES General Information: Use proper personal protective equipment as indicated in Section 8. Spills/Leaks: Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, observing precautions in the Protective Equipment section. Avoid generating dusty conditions. Provide ventilation. Section 7 - HANDLING and STORAGE Handling: Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Storage: Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Section 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION Engineering Controls: Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower. Use adequate ventilation to keep airborne concentrations low. Exposure Limits CAS# 1898-66-4: Personal Protective Equipment Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure. Respirators: A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant respirator use. Section 9 - PHYSICAL AND CHEMICAL PROPERTIES Physical State: Crystalline powder Color: black - gold Odor: Not available. pH: Not available. Vapor Pressure: Not available. Viscosity: Not available. Boiling Point: Not available. Freezing/Melting Point: 125 deg C Autoignition Temperature: Not applicable. Flash Point: Not applicable. Explosion Limits, lower: Not available. Explosion Limits, upper: Not available. Decomposition Temperature: Solubility in water: Specific Gravity/Density: Molecular Formula: C18H12N5O6 Molecular Weight: 394.32 Section 10 - STABILITY AND REACTIVITY Chemical Stability: Stable under normal temperatures and pressures. Conditions to Avoid: Incompatible materials, dust generation, excess heat, strong oxidants. Incompatibilities with Other Materials: Oxidizing agents, strong bases. Hazardous Decomposition Products: Nitrogen oxides, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide. Hazardous Polymerization: Has not been reported Section 11 - TOXICOLOGICAL INFORMATION RTECS#: CAS# 1898-66-4: MW3250000 LD50/LC50: Not available. Carcinogenicity: Hydrazyl, 2,2-Diphenyl-1-(2,4,6-Trinitrophenyl) - Not listed by ACGIH, IARC, or NTP. Other: See actual entry in RTECS for complete information. Section 12 - ECOLOGICAL INFORMATION Section 13 - DISPOSAL CONSIDERATIONS Dispose of in a manner consistent with federal, state, and local regulations. Section 14 - TRANSPORT INFORMATION IATA Not regulated as a hazardous material. IMO Not regulated as a hazardous material. RID/ADR Not regulated as a hazardous material. Section 15 - REGULATORY INFORMATION European/International Regulations European Labeling in Accordance with EC Directives Hazard Symbols: XN Risk Phrases: R 20/21/22 Harmful by inhalation, in contact with skin and if swallowed. Safety Phrases: S 24/25 Avoid contact with skin and eyes. S 28A After contact with skin, wash immediately with plenty of water. S 37 Wear suitable gloves. S 45 In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible). WGK (Water Danger/Protection) CAS# 1898-66-4: No information available. Canada CAS# 1898-66-4 is listed on Canada's NDSL List. CAS# 1898-66-4 is not listed on Canada's Ingredient Disclosure List. US FEDERAL TSCA CAS# 1898-66-4 is listed on the TSCA inventory. SECTION 16 - ADDITIONAL INFORMATION N/A |
CHEMICAL IDENTIFICATION
HEALTH HAZARD DATAACUTE TOXICITY DATA
|
Symbol |
GHS08 |
---|---|
Signal Word | Danger |
Hazard Statements | H317-H334 |
Precautionary Statements | P261-P280-P342 + P311 |
Hazard Codes | Xn:Harmful; |
Risk Phrases | R20/21/22 |
Safety Phrases | S24/25 |
RIDADR | UN2811 |
WGK Germany | 1 |
RTECS | MW3250000 |
Packaging Group | II |
Hazard Class | 6.1 |