Abstract
The purpose of this study was to evaluate the antioxidant abilities of freeze-dried water extracts and essential oils from 4 species of Melissa officinalis L. (TCA8901, TCA8902, TCA8903 & TCA9101) and the tea bag of M. officinalis L., using scavenging DPPH and FRAP assays. In scavenging 50 % DPPH assay (IC50), freeze-dried water extract of TCA8901 had higher antioxidant activity (43 μg/mL), followed by TCA9101 (53 μg/mL), TCA8902 (55 μg/mL), TCA8903 (57 μg/mL), and tea bag liquor (168 μg/mL). However, no apparent antioxidant activity was observed with essential oils. In the FRAP assay, each gram of freeze-dried water extracts had different reducing capacity (FRAP value) in an order of TCA9101, TCA8901, TCA8903 and TCA8902, equivalent to 13.75, 13.70, 12.54 and 12.16 mg vitamin C, respectively. The FRAP value of tea bag liquor was equivalent to 1.83 mg vitamin C. Moreover, each gram of essential oils was found to have reducing capacity (FRAP value) in an order of TCA9101, TCA8901, TCA8902 and TCA8903, equivalent to 148.9, 135.9, 121.9 and 103.7 mg of BHT, respectively. Above all, M. officinalis species of TCA8901 and TCA9101 were found to have better antioxidant abilities in this study.
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