Antioxidant activity of green and white asparagus (Asparagus officinalis) extracts grown in Korea
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This study analyzed the physiological activity and bioactive substances in 65℃ hot water and 70% ethanol extracts of green and white asparagus grown in Gangwon Province, which accounts for half of Korea’s asparagus production. The hot water and 70% ethanol extracts of green asparagus (termed WEGA and EEGA, respectively) and white asparagus (termed WEWA and EEWA, respectively) were prepared, and their functional components were analyzed. The total polyphenol content of WEGA was 38.96 mg GAE/g (milligram of gallic acid equivalents per gram of dry matter), which was twice higher than that of WEWA, indicating significant differences based on solvent type and asparagus color. Furthermore, the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azino-bis-(3- ethylbenzothiazoline-6-sulfonic acid) (ABTS) diammonium salt radical-scavenging activities of green asparagus extracts exceeded those of white asparagus extracts. Among the asparagus extracts, EEGA had the highest superoxide dismutase-like activity (55.26%) at a concentration of 100 μg/mL. In conclusion, the 70% ethanol extracts of Korea-grown green asparagus exhibited superior antioxidant properties compared to those from white asparagus, highlighting their potential as a valuable functional food with notable antioxidant benefits.
Abstract
This study analyzed the physiological activity and bioactive substances in 65℃ hot water and 70% ethanol extracts of green and white asparagus grown in Gangwon Province, which accounts for half of Korea’s asparagus production. The hot water and 70% ethanol extracts of green asparagus (termed WEGA and EEGA, respectively) and white asparagus (termed WEWA and EEWA, respectively) were prepared, and their functional components were analyzed. The total polyphenol content of WEGA was 38.96 mg GAE/g (milligram of gallic acid equivalents per gram of dry matter), which was twice higher than that of WEWA, indicating significant differences based on solvent type and asparagus color. Furthermore, the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azino-bis-(3- ethylbenzothiazoline-6-sulfonic acid) (ABTS) diammonium salt radical-scavenging activities of green asparagus extracts exceeded those of white asparagus extracts. Among the asparagus extracts, EEGA had the highest superoxide dismutase-like activity (55.26%) at a concentration of 100 μg/mL. In conclusion, the 70% ethanol extracts of Korea-grown green asparagus exhibited superior antioxidant properties compared to those from white asparagus, highlighting their potential as a valuable functional food with notable antioxidant benefits.