Abstract
The objective of present study was to analyze the chemical composition and antioxidant activity of hexane extract from different plant parts of Zingiber chrysanthum Rosc. GC/MS analysis revealed the vast chemical diversity with geranyl linalool as major constituent which varied quantitatively in different parts like rhizomes (27.8%), seed (40.3%) and perianth (3.8%) along with other minor mono and sesquiterpenoids. The antioxidant activity of the hexane extracts was measured by their ability to scavenge free radicals, metal chelating and reducing power. The antioxidant of the extracts was found to have positive correlation with the total phenolic content of the extracts while IC50 values exhibited negative correlation. The total phenolic contents were determined by Folin-Ciocalteu method using gallic acid as the standard. Among the extracts under study exhibited dose dependent antioxidant potential however DPPH radical scavenging activity was found maximum in with IC50 value 187.93±0.75 μg/ml and negative correlation (-0.788) with phenols. Based on these data, it can be concluded that this medicinally important traditionally herb may be a good source of industrially important phytochemicals like geranyl linalool and natural antioxidant.
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