Screening of 70 medicinal plant extracts for antioxidant capacity and total phenols V .

Content Provider	Semantic Scholar
Author	Katalinic Milos, Mia Kulisić, Tea Jukic, Mila
Copyright Year	2004
Abstract	The total phenolic content and related total antioxidant capacity of 70 medicinal plant infusions was analyzed. Infusions were prepared in common way in which teas are prepared for human consumption. The total phenolics were measured by Folin–Ciocalteau assay. The total antioxidant capacity was estimated by Ferric Reducing/Antioxidant Power (FRAP) assay. To make practical comparison of relative antioxidant potential of phenolics extracted from selected medicinal plants, the phenol antioxidant coefficient (PAC) was calculated for each infusion. The total phenolic content of medicinal plant infusions ranges from 9 to 2218 mg/L. The FRAP range from 0.06 to 25 mM/L. There was significant linear correlation between total phenolic content and FRAP. According to their antioxidant capacity, 70 medicinal plant extracts can be divided in five groups: (a) very low FRAP (<1 mM/L) n = 9; (b) low FRAP (1–5 mM/L), n = 37; (c) good FRAP (5–10 mM/L), n = 15; (d) high FRAP (10–20 mM/L), n = 8; and (e) very high FRAP (>20 mM/L), n = 1 medicinal plant extract. The PAC was ranging from 1.1 to 3.9 (average 2.4). The best results were obtained for Melissae folium infusions: high phenolic concentration, very high FRAP (>20 mM/L) and PAC > 3. The effect of infusion time and infusion temperature on the phenolic content, FRAP, and free radical scavenging ability was tested. DPPH radical scavenging ability ofMelissae folium phenolics was similar to (+)-catechin but not as good as for quercetin. Compared to Trolox and vitamin C, Melissae folium phenolics were more efficient free ABTS radical scavengers. The results indicate thatMelissae folium infusions could be an important dietary source of phenolic compounds with high antioxidant capacity comparable with red wine or beverages like tea. 2005 Elsevier Ltd. All rights reserved.
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Language	English
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Subject Keyword	Antioxidants Arctostaphylos uva-ursi leaf extract Ascorbic Acid Beverages Cerebellar folium Emoticon Extraction Folium of vermis of cerebellum Fraps Free Radical Scavenging Free Radical Scavenging Activity [MoA] Free Radicals High Fructose Corn Syrup Lethrinidae Matthews correlation coefficient Medicinal chemistry Phenol formaldehyde resin Phenols Plant Extracts Plants, Medicinal Quercetin Search for extraterrestrial intelligence Tea Trolox C Video-in video-out ferric oxide folin phenolics
Content Type	Text
Resource Type	Article