Journal
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
Volume 24, Issue 4-5, Pages 506-515Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jfca.2011.01.020
Keywords
Total phenolic content; Total flavonoid content; Antioxidant activity; Radical scavenging activity; Raw vegetables; Extraction solvent; Food analysis; Food composition
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Funding
- Ministry of Agriculture and Agro-based Industry Malaysia [05-01-05-SF0066]
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Thirty-seven raw vegetables were extracted using four solvent systems: 70% acetone, 70% ethanol, 70% methanol, and distilled water. The extracts were tested for their total phenolic content, total flavonoid content and antioxidant activities (using diphenylpicryl-hydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) assays). The results revealed the effect of different extracting solvents in altering the quantitative analyses of all vegetables and 70% acetone was identified as the most efficient solvent for extracting polyphenolic antioxidants from the vegetables. The highest total phenolic content and total flavonoid content were obtained from 70% acetone extract of Portulaca oleracea (138.2 +/- 2.1 mg GAE/g dw basis) and 70% methanol extract of Cosmos caudatus (27.7 +/- 1.0 mg QE/g dw basis), respectively. The 70% acetone extract of Etlingera elatior with moderate amount of total phenolic content exhibited the highest antioxidant activity in both assays. The correlation analyses within 37 different extracts of each solvent extraction demonstrated weak to moderate relationships between all the studied parameters. The highest r value of 0.7139 (p < 0.001) was determined between total phenolic contents and FRAP values of the 70% methanol extracts. Meanwhile, a wide range of correlation coefficients was derived from correlation analyses within four different extracts of each vegetable, with the highest relationship between total phenolic contents and FRAP values for the extracts of Coriandrum sativum (r = 0.9998, p < 0.001). (C) 2011 Elsevier Inc. All rights reserved.
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