Effect of maturation stages and storage conditions on physicochemical properties of three-leave cayratia (Cayratia trifolia) berries from different geographical regions in Vietnam
Abstract
This study aims at investigating the influence of sampling locations, maturation stages, and storage conditions on total polyphenol content in threeleaf cayratia ( Cayratia trifolia) berries collected from 09 provinces of the Mekong Delta River in Vietnam, including Kien Giang, An Giang, Dong Thap, Long An, Bac Lieu, Ca Mau, Soc Trang, Tra Vinh, and Ben Tre. The High Performance Liquid Chromatography technique (HPLC) was used to quantify quercetin and resveratrol contents in Cayratia trifolia berries samples. The results showed that Cayratia trifolia berries had a high polyphenol content from 12.14 to 19.51 mg GAE/g, being highest in samples collected in Dong Thap (DT1) (19.51 mg GAE/g). During the ripening stages from unripened to fully ripened, the total phenolic content of Cayratia trifolia berries samples from An Giang (AG3), Tra Vinh (TV4), Dong Thap (DT1, DT2), Ca Mau (CM1, CM2) increased whereas it decreased in those collected in KG1, DT3, DT4, CM3, and CM4. This variation could be due to changes in phenolic compound accumulation during fruit maturation, geographical location, and growing conditions. Besides, total polyphenol content in frozen Cayratia trifolia berries frozen showed no significant change (18.62 mg GAE/g) during 5 days of storage, while increased to 19.05 mg GAE/g after 7 days. The results on HPLC further showed that the amount of quercetin and resveratrol in DT samples were 0.14 ± 0.012 and 1.46 ± 0.035 mg/g fresh weight.