Photoreduction of 2,2-Diphenyl-1-picrylhydrazyl (DPPH) in Hydrocarbons

Optimized DPPH assay in a detergent-based buffer system for measuring antioxidant activity of proteins

“… A 2 mM methanolic solution of DPPH was freshly prepared and wrapped in aluminum foil to prevent photochemical decomposition as mentioned in [5] . 50 μl of the 2 mM DPPH stock solution was added to 950 μl detergent-based buffer to achieve a final DPPH concentration of 100 μM.…”

“…A 2 mM methanolic solution of DPPH was freshly prepared and wrapped in aluminum foil to prevent photochemical decomposition as mentioned in [5] .…”

Positive Photoreactive Polyimides. II. Preparation and Characterization of Polyimide Precursors Containing α-(2-Nitrophenyl)ethyl Ester Side Chains

“…This reaction was confirmed by evaluating the changes in the IR absorption spectra of the polymer upon U V irradiation. In order to compare the photorearrangement conversion of 2-nitrobenzyl ester having a methyl group at the a-position to that of an unsubstituted ester, the changes in the IR nitro [ 8 ] and ester absorbance upon UV irradiation were determined. The absorbance at 1530 cm-' (nitro group) and at 1730 cm-' (ester linkage) were used, and these ratios were calculated with reference to the absorbance of the alicyclic methylene group at 2830 cm-' , which remains unaltered on W irradiation (Fig.…”

Effect of peroxides and hydroperoxides on the camphorquinone-initiated photopolymerization

“…The presence of 100 ppm hydroquinone methyl ether in the TEGDM had almost no influence on the polymerization kinetics according to another report 34) . As free radical scavenger and singlet oxygen ( 1 O 2 ) scavenger 2,2-diphenyl-1-picrylhydrazyl hydrate (DPPH9) [35][36][37] (Aldrich) and 1,3-diphenylisobenzofuran 38) (Aldrich) were used, respectively.…”