Nutritional and nutraceutical characteristics of Sageretia theezans fruit
Tae Kyung Hyun a,1, Sang Churl Song b,1, Chang-Khil Song c,d,
Ju-Sung Kim c,d,*
a Department of Industrial Plant Science and Technology, College of Agricultural, Life and Environmental Sciences,
Chungbuk National University, Cheongju 361−763, Republic of Korea
b Jeju Special Self Governing Province Agricultural Research and Extension Services, Jeju 697−828, Republic of Korea
c Majors in Plant Resource and Environment, College of Agriculture and Life Sciences, Sustainable Agriculture
Research Institute (SARI), Jeju National University, Jeju 690−756, Republic of Korea
d The Research Institute for Subtropical Agriculture and Biotechnology, Jeju National University, 690−756,
Republic of Korea
The fruit of Sageretia theezans is one of many underutilized edible fruits that grow along the southern seashores of East Asia. In this study, to evaluate the nutritional and nutraceutical values of S. theezans fruit, the composition of minerals, organic acids, and proximate and fatty acids, the total phenolic, total flavonoid, and total anthocyanin content, and the antioxidant and antidiabetic activities of S. theezans fruit were analyzed. The results indicate that S. theezans fruit could be classified as a potential potassium-, malic acid-, and linoleic/oleic acid-rich fruit. In addition, The ethyl acetate (EtOAc) fraction of the 70% ethanol (EtOH) crude extract exhibited strong antioxidant activities including free radical scavenging and reducing power activities compared with the same concentration of butylated hydroxytoluene. Furthermore, the EtOAc fraction showed significant inhibition of α-glucosidase activity. The analysis of the total phenolic and flavonoid content suggested that the remarkable antioxidant and antidiabetic activities of the EtOAc fraction are due to the presence of high levels of polyphenolic compounds.
Keywords: antidiabetic activity, antioxidant activity, mineral, proximate composition, Sageretia theezans