https://repository.kopri.re.kr/handle/201206/5246 2026-04-16T00:06:58Z 2026-04-16T00:06:58Z Paudel, Babita Yim, Joung Han Bhattarai, Hari Datta https://repository.kopri.re.kr/handle/201206/5976 2022-03-24T07:12:02Z 2012-01-01T00:00:00Z

Title: In vitro antioxidant activity of the Antarctic lichen Caloplacaregalis and its GC/MS based phytochemical analysis Authors: Paudel, Babita; Yim, Joung Han; Bhattarai, Hari Datta Abstract: Antioxidant agents, which inhibit the destructive actions of free radicals or reactive oxygen species (ROS), are widely used as food additives as well as in medicines and cosmetics. Antioxidant agents derived from natural sources are believed to be safer than synthetic compounds. In order to identify a new potential source of natural antioxidant compounds, we evaluated various antiradical and antioxidant activities of an ethanolwater extract of Caloplaca regalis (Vain.) Zahlbr. (Teloschistaceae), a lichen collected from the Antarctica. The experimental data indicated that even the crude extract of C. regalis exhibited a significant potential to inhibit free radical production. The GC/MS analysis showed that C. regalis extract contained various derivatives of benzoic acids, furanone, anthraquinone and several fatty acids. In addition, the total phenolic content in the lichen extract was found to be more than 8% by weight. We conclude that C. regalis does indeed produce antioxidant active compounds, which would have much strong activities if tested in a purified form. Thus, further research should be conducted to purify and characterize the compounds responsible for the antioxidant activity of C. regalis extract, as these compounds may be an alternative source of medically relevant antioxidant. Keywords:eved to be safer than synthetic compounds. In order to identify a new potential source of natural antioxidant compounds, we evaluated various antiradical and antioxidant activities of an ethanolwater extract of Caloplaca regalis (Vain.) Zahlbr. (Teloschistaceae), a lichen collected from the Antarctica. The experimental data indicated that even the crude extract of C. regalis exhibited a significant potential to inhibit free radical production. The GC/MS analysis showed that C. regalis extract contained various derivatives of benzoic acids, furanone, anthraquinone and several fatty acids. In addition, the total phenolic content in the lichen extra

2012-01-01T00:00:00Z Yim, Joung Han Kong, Min Kyung Lee, Pyung Cheon https://repository.kopri.re.kr/handle/201206/5946 2022-03-24T07:11:51Z 2011-01-01T00:00:00Z

Title: Separation of Xanthorhodopsin from Salinibacter ruber and its in vitro Reconstruction Authors: Yim, Joung Han; Kong, Min Kyung; Lee, Pyung Cheon Abstract: Capture and conversion of abundant solar energy using biotechnology will be essential for the development of sustainable and future energy.Photosynthesis is used for the production of biofuels such as biohydrogen. In this study, lightharvesting xanthorhodopsin consisting of retinal and salinixanthin was isolated from a photosynthetic microorganism Salinibacter ruber by aqueous two phase extraction. To stabilize the light-harvesting machine, artificial xanthorhodopsin-liposome system was reconstructed to have photoelectron absorption activity.

2011-01-01T00:00:00Z