purpurogallin

purpurogallin

[‚pər·pyə·rō′gal·ən]
(organic chemistry)
C11H8O5 A red, crystalline compound, the aglycon of several glycosides from nutgalls; decomposes at 274-275°C; soluble in boiling alcohol, methanol, and acetone; used as an antioxidant or to retard metal contamination in hydrocarbon fuels or lubricants.
References in periodicals archive ?
The purpurogallin formation was measured by a UV-visible spectrophotometer at 430 nm and its molar extinction coefficient (2.
The enzymatic activities were expressed in specific activity (POD-[micro]mol of purpurogallin [min.
1] was used to calculate POX activity (CHANCE & MAEHLEY, 1955), which was expressed in mM of purpurogallin produced by [min.
The amount of purpurogallin formed was determined by measuring the absorbance at 420 nm against a blank and was measured as [micro]M purpurogallin formed [g.
One unit of POD was defined as the amount of enzyme that caused the formation of 1 mg of purpurogallin from pyrogallol.
The absorbancy of the purpurogallin formed was taken at 420 nm at time (40, 100s) for polyphenol oxidase assay (Kar and Mishra, 1976).
After incubated for 2h, the purpurogallin formed was extracted with 35 mL ether and determined by taking the absorbancy at 420 nm.
4] and the purpurogallin was extracted by ethyl ether.
Other naturally occurring antioxidants, including gallic acid, methyl gallate, juglone, purpurogallin and tannin, have been reported in walnuts and are effective in preserving quality.
The spectrophotometer was set on 420 nm and the concentration of purpurogallin in 1-butanol was measured colorimetrically.
1993) Purpurogallin as an antioxidant protector of human erythrocytes against lysis by peroxyl radicals.