Phenolic extracts from Acacia mangium bark and their antioxidant activities.

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Liangliang ZhangMan Xu

Abstract

Phenolic compounds are present at very high concentrations in the bark of Acacia mangium. These compounds are known to have strong antioxidant activity and thus different beneficial effects on human health. Phenolic compounds in bark of A. mangium were extracted and their antioxidant activities were investigated using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical-scavenging and ferric-reducing antioxidant power (FRAP) assays. A central composite design has been employed to optimize the experimental conditions for a high total phenolic content and antioxidant activity. The desirability function approach has been employed to simultaneously optimize the three responses: total phenols, antiradical activity and FRAP. An extraction time of 90 min, liquid-solid ratio of 5, and temperature of 50 degrees C was predicted for the optimum experimental conditions using the desirability function. A significant linear relationship between antioxidant potency, antiradical activity and the content of phenolic compounds of bark extracts was observed. The structures of condensed tannins isolated from A. mangium were characterized by MALDI-TOF MS analyses. Condensed tannin oligomers from A. mangium were shown to be heterogeneous mixtures c...Continue Reading

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Citations

Dec 11, 2013·Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences·Pengfei WanYanhua Li
Feb 23, 2013·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ali KhoddamiThomas H Roberts

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