The purpose of this study was to examine the phytochemical content and antioxidant activity of Coptosapelta flavescens Korth root extract obtained from various places. Phytochemical screening, antioxidant activity testing using DPPH radical reduction, color reaction (ABTS), iron reduction (FRAP), reduction capacity technique (RP), and total antioxidant capacity (TAC). The phytochemical tests revealed that C. flavescens water and ethanol extract included alkaloids, coumarins, terpenoids, tannins, and flavonoids. The antioxidant activity results revealed that raw material samples gathered directly in the wild in Ninh Son district (Ninh Thuan province, Vietnam) were more effective than those purchased at the local market with EC50 times value. DPPH, ABTS, FRAP, RP, and TAC techniques yielded 56.02 µg/ml, 54.12 µg/ml, 15.9 µg/ml, 44.85 µg/ml, and 110.94 µg/ml, respectively. The antioxidant impact of raw material samples obtained in Bac Ai district (Ninh Son province, Vietnam) was lower but overall better than that of samples gathered at the local market.
Garlic is a globally used spice due to its pungent taste and a fishy deodorant and digestive stimulator. Owing to the widespread use of garlic in both Oriental and Western medicine, further investigations on garlic extracts might carry important implications in the industry. In this study, we conducted extraction of garlic extraction by two conventional methods and an ultrasonic assisted method. The processes were optimized with respect to various quality parameters including polyphenol, flavonoid content, and antioxidant activity. The results showed that extracting garlic under the ultrasonic support will show higher efficiency than the non-ultrasonic extraction. The optimal extraction parameters are: 70% ethanol solvent, 10/1 solvent / material ratio, 40 °C temperature and 40 minutes time. Keywords: Allium Sativum L., Garic, Polyphenol, Flavonoid, Antioxidant
Garlic (Allium sativum L.) is a plant species native to Central Asia and has been widely grown in other regions such as Mediterranean regions as well as Asia, Europe and Africa. Determining the optimal time of storage is very important in maintaining stable garlic agricultural supply chain. In this study, we aim to identify optimal storage conditions and packaging materials that allow maintaining highest nutritional values of garlic. Garlic was harvested and stored at different temperatures and storage time. A wide range of quality parameters of garlic were taken into account including total polyphenol content, total flavonoid content, antioxidant activity, free radical scavenging activity, moisture and weight loss. The results of the study show that, at 0 °C, garlic bulbs showed minimal mass weight loss (0.49%) and stabilized polyphenol content. The change of DPPH free radical activity and the total flavonoid content in garlic bulbs stored under different temperature conditions were minor. Lastly, net cloth packaging introduced favorable loss of weight of garlic bulbs during prolonged storage.
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