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  • D9132 - 2,2-Diphenyl-1-picrylhydrazyl

D9132 Aldrich


Synonym: 1,1-Diphenyl-2-picrylhydrazyl radical, 2,2-Diphenyl-1-(2,4,6-trinitrophenyl)hydrazyl, DPPH

  • CAS Number 1898-66-4

  • Empirical Formula (Hill Notation) C18H12N5O6

  • Molecular Weight 394.32

  •  Beilstein Registry Number 1846081

  •  EC Number 217-591-8

  •  MDL number MFCD00007231

  •  PubChem Substance ID 57654141



Related Categories Chemical Synthesis, Picrylhydrazyl Derivatives, Radical Chemistry, Stable Radicals, Synthetic Reagents More...
color   green
mp   ~135 °C (dec.)(lit.)
storage temp.   2-8°C


Other Notes

Free radical


1, 5 g in glass bottle

General description

2,2-diphenyl-1-picrylhydrazyl is a free radical, which shows hydrogen acceptor ability towards antioxidants. Hence, it is commonly used in DPPH assay for measuring the antioxidant activity of different natural samples such as wine, fruits, herbal tea etc.

Price and Availability

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Safety & Documentation

Safety Information

GHS08  GHS08
Signal word 
Hazard statements 
Precautionary statements 
NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
How do I get lot-specific information or a Certificate of Analysis?
A Certificate of Analysis is available by lot number and can be obtained through our Advanced Search Option: http://www.sigmaaldrich.com/catalog/AdvancedSearchPage.do
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There are several ways to find pricing and availability for our products.  Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers. 
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS. To access the shipping information for this material, use the link on the product detail page for the product, or search here. 
My question is not addressed here, how can I contact Technical Service for assistance?
Use the option to the right to "Ask a Question" by email of a Technical Service Scientist.
What is the solubility of 2,2-Diphenyl-1-picrylhydrazyl, DPPH, Product D9132?
We would expect this material to be soluble in chloroform and methanol. Quality control testing shows that a concentration of about 50mg/mL in chloroform can be achieved.
At what wavelength is the absorbance maximum (lambda max) for 2,2-Diphenyl-1-picrylhydrazyl, DPPH, Product D9132?
Using chloroform as the solvent, the lambda max is approximately 332 nm.
What is the extinction coefficient of 2,2-Diphenyl-1-picrylhydrazyl, DPPH, Product D9132?
The millimolar extinction coefficient (EmM) has been reported to be 19.07 in chloroform, measured at a wavelength of 332 nm. Reference: Organic Electronic Spectra Data (OESD), 1, p. 753 (1946-1952).
Is there a list available of other stable radicals that are sold by Sigma-Aldrich?
More stable radicals can be found at the link: http://www.sigmaaldrich.com/chemistry/chemistry-products.html?TablePage=16279893
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