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Separation and evaluation of free radical‐scavenging activity of phenol components of Emblica officinalis extract by using an HPTLC–DPPH • method
Author(s) -
Pozharitskaya Olga N.,
Ivanova Svetlana A.,
Shikov Alexander N.,
Makarov Valery G.
Publication year - 2007
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200600532
Subject(s) - gallic acid , chemistry , dpph , ascorbic acid , ellagic acid , chromatography , derivatization , organic chemistry , hydrolyzable tannin , officinalis , antioxidant , polyphenol , high performance liquid chromatography , food science , traditional medicine , medicine
A new procedure has been developed to separate and quantify the free radical‐scavenging activity of individual compounds from an Emblica officinalis extract based on the combination of HPTLC with a diode array detector (DAD) and postchromatographic DPPH • radical derivatization. Free gallic and ellagic acids and emblicanins A and B in the E. officinalis extract were separated by TLC and identified. All the compounds of the extract were capable of scavenging of DPPH • radicals. It was established that the DPPH • scavenging activity of emblicanins A and B was 7.86 and 11.20 times more than that of ascorbic acid and 1.25 and 1.78 times more than gallic acid, respectively. From the estimated ID 50 values, it can be seen that the increasing order of activity was emblicanin B > emblicanin A > gallic acid > ellagic acid > ascorbic acid. Probably, the antioxidant activity of E. officinalis extract is associated with the presence of hydrolyzable tannins having ascorbic acid‐like action.