Effect Of Solvent On Flavonoid, Polyphenol Content And Biological Activities Of Phyla Nodiflora Extracts
Abstract
This study investigated the influence of different solvents on the total polyphenol and flavonoid content; and antioxidant and anti-inflammatory activity (NO inhibition) of Phyla nodiflora extracts. Food-grade ethanol 90° (ethanol), and ethanol/water mixtures at ratios of 7:3, 5:5, and 3:7 were used as the extracting solvents, yielding the corresponding extracts PN-E100, PN-EW73, PN-EW55, and PN-EW37, respectively. The results showed that the PN-EW73 extract had the highest total polyphenol content of 45.46 mg/g, while the PN-E100 extract had the highest total flavonoid content of 67.01 mg/g. The PN-EW73 extract also exhibited the best antioxidant activity as determined by the phosphomolybdenum and DPPH methods, and the best ability to inhibit nitric oxide production with EC50 values of the assays were 96.17, 63.98, and 75.13 µg/mL, respectively. These results facilitate selecting suitable solvents in developing natural antioxidant and natural NO inhibitory products derived from Phyla nodiflora.
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