Antioxidant activities of seed extracts from Dalbergia odorifera T. Chen

摘要

The heartwood or root of?Dalbergia odorifera?T.?Chen?is an important traditional Chinese medicine.?Antioxidant activities of seed extracts from?D. odorifera?T.?Chenwere first investigated in?this?study. Ethanolic extracts were suspended in distilled water and partitioned successively?with petroleum ether, ethyl acetate, n-butanol (n-BuOH) and water, yielding four extracts named as PE, EE, BE and WE, respectively.?The?EE?exhibited the highest total phenolic, total flavonoid, 1,?1-diphenyl-2-picrylhydrazyl?(DPPH) radical?scavenging?activity,?reducing power,linoleic acid and lard peroxidation inhibition,?but lowest chelating ability. Liquid chromatography mass spectrometry (LC/MS)?analysis of EE revealed that there was a predominant component with?negative molecular ion [M-H]-?at m/z 373.2, a fragment at m/z?343.2 and UV λmax?at 263 and 297nm.?The mechanisms of antioxidant activities of seed extracts were exploited. Positive linear correlations were observed between reducing power and DPPH radical scavenging activity (R2= 0.836), and linoleic acid peroxidation inhibition (R2?= 0.920), respectively. Similarly, high positive linear correlations of the total phenolic and total ?avonoid with DPPH radical scavenging activity, reducing power and linoleic acid peroxidation inhibition were observed.?This study therefore suggests that seeds of?D. odoriferaT.?Chen have the potential to be used as natural antioxidants in food or pharmaceutical?industry.