Extracts of Peppermint, Chamomile and Lavender as Antioxidants
This paper is devoted to the studies of total polyphenol content and antiradical activity of peppermint, chamomile and lavender grown in local backyard gardens of Latvia. Different solvents (96, 70 and 40% ethanol) and extraction methods (maceration at room temperature at dark or under day-light irradiation, as well as reflux) were tested. All extracts were analyzed for total polyphenol content (Folin–Ciocalteu method), as well as for antiradical activity (DPPH and GO assays). It was found out that local peppermint and chamomile is as good source of polyphenols as those plants grown in southern countries; however, the total polyphenol content of lavender is lower than that mentioned in literature. The highest polyphenol content for all plant materials was achieved, when 70% ethanol was used for extraction. Peppermint extracts were found as most powerful free radical scavengers among all tested plant materials. 96% Ethanol extract of peppermint and chamomile demonstrated the highest antiradical activity, while 70% ethanol was the most suitable for preparation of lavender extract with optimal free radical scavenging activity.
I. Mieriņa et al., "Extracts of Peppermint, Chamomile and Lavender as Antioxidants", Key Engineering Materials, Vol. 762, pp. 31-35, 2018