Jang-Woo Park

Antioxidation activity of oil extracts prepared from various seeds

The anti-oxidative activity of ethanol and methanol extracts from various seed oils (perilla seed oil, camellia seed oil, pine seed oil, flaxseed oil, and olive oil) was investigated using DPPH free radical scavenging activity (DPPH-RSA), hydroxyl radical scavenging activity (Hydroxyl-RSA), fluorescent development, browning level development, microsomal lipid peroxidation (MLP), and t-BOOH-induced cytotoxicity assays. Both browning and fluorescence level were observed higher value in methanol extract of camellia seed oil (CSO-ME). This meant that CSO-ME had more available antioxidant matters. Radical scavenging activity of CSO-ME was the highest among all seed oil extracts, and was 61.1% in the DPPH-RSA and 64.5% in the Hydroxyl-RSA test. Based on in vitro tests, all extract treatments significantly reduced both thiobarbituric acid-reactive substrate formation and lactate dehydrogenase release, indicating high antioxidant activity. These results suggest that ethanol and methanol extracts from seed oils can be a potentially good dietary lipid supplement source against oxidative stress.

A Study on Total Sugar Content in Cooked Rice and Side Dishes of Eat-out Korean Food

The objective of this study was to investigate the total sugar content of cooked rice (e.g. Bokkeumbap, Deopbap, Bibimbap, Gimbap, Chobap) and side dishes (Jjigae, Kimchi, Jangajji) by using HPLC analysis. Samples were collected from six regions in Korea (Seoul, Gyeonggi-do, Chungcheong-do, Gangwon-do, Jeonla-do, Gyeongsangdo). In cooked rice, the total sugar content in Bibimbap (8.537 g/100 g), Jangeo-deopbap (3.207 g/100 g), and Saladgimbap (2.394 g/100 g) was higher than that of other cooked rice. Also the analysis results showed that the total sugar content of cooked rice with spice and sauce added was a little higher than that of other kinds of cooked rice. From the analysis of Jjigae, it was shown that Doenjang-jjigae (1.805 g/100 g) from the Jeonla-do region had the highest total sugar content while there was no difference in total sugar content from the other regions. In case of Kimchi, that from Jeonla-do and Gyeongsang-do was very sweet, salty, and spicy, and the total sugar content was higher than that from the other regions. The highest total sugar content among the analyzed Kimchi was in Godeulppaegikimchi with a value of 8.188 g/100 g. In addition, the total sugar content in Jangajjie, as a pickle among side dishes, was shown to be higher than that of the other side dishes with the highest range among Jangajjie of 32.865 g/100 g to 41.846 g/100 g being found in Maesil-jangajji.