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In vitro Antioxidant Capacities of Two Benzonaphthoxanthenones: Ohioensins F and G, Isolated from the Antarctic Moss Polytrichastrum alpinum

Cited 5 time in scopus
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Title
In vitro Antioxidant Capacities of Two Benzonaphthoxanthenones: Ohioensins F and G, Isolated from the Antarctic Moss Polytrichastrum alpinum
Other Titles
남극 이끼류 Polytrichastrum alpinum 로부터 분리한 Ohioensins F and G의 항산화 능력
Authors
Bhattarai, Hari Datta
Paudel, Babita
Oh, Hyuncheol
Yim, Joung Han
Lee, Hong Kum
Subject
Meteorology & Atmospheric Sciences
Keywords
ABTS; DPPH; Nitric Oxide; Polytrichastrum alpinum
Issue Date
2009
Citation
Bhattarai, Hari Datta, et al. 2009. "In vitro Antioxidant Capacities of Two Benzonaphthoxanthenones: Ohioensins F and G, Isolated from the Antarctic Moss Polytrichastrum alpinum". ZEITSCHRIFT FUR NATURFORSCHUNG SECTION C-A JOURNAL OF BIOSCIENCES, 1(64c): 197-200.
Abstract
Antioxidant agents against reactive oxygen species call be used for several cosmetic and medicinal applications. This study's objective was to evaluate the antioxidant activities of Polytrichastrum alpinum (Hedw.) G. L. Sm. (Polytrichaceae), an Antarctic moss species collected from King George Island (Antarctica). The identification of the moss species was performed on the basis of morphological characteristics and molecular sequencing of the 18S rRNA gene. Two benzonaphthoxanthenones: ohioensins F and G, were isolated from the extract after several chromatographic procedures. The various in vitro antioxidant capacities of a methanolic extract of P. alpinum and the isolated Compounds were evaluated by analyzing the scavenging capacities of free radicals of 2,2-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) and 2,2-diphenyl-1-picrylhydrazyl (DPPH), the total phenol assay with Folin-Ciocalteu reagent, the ferric ion (Fe(3+)) reducing power and the nitric oxide (NO) scavenging activity and compared to those of commercial standards for each assay. The experimental data showed that even the crude extract of R alpinum exhibited potent antioxidant activity. The antioxidant activity was increased two- to seven-fold for the purified compounds. The antioxidant activities of both purified compounds were found to be more or less the same in all experiments. However, the obtained data showed that the Fe(3+) reducing power of the purified Compounds and Crude methanolic extract was almost the same suggesting the presence of other stronger reducing agents in the methanolic extract which could not be isolated in the present experiment. Therefore, further work on the isolation of these stronger antioxidant agents from this moss specimen of the extreme environment is warranted. Developments of laboratory mass Culture techniques are anticipated to achieve bulk production of the active constituents for commercial application.
URI
http://repository.kopri.re.kr/handle/201206/6607
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