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Showing posts with label International Journal. Show all posts
Showing posts with label International Journal. Show all posts

Friday, 29 November 2013

Qualitative and Quantitative Determination of the Caffeoylquinic Acids on the Korean Mountainous Vegetables Used for Chwinamul and Their Peroxynitrite-Scavenging Effect

Abstract 

Mountainous vegetables called chwinamul are used in Korea to promote health. Chwinamul was obtained from several plants belonging to the Compositae - e.g., Kalimeris yomena, Aster scaber, Solidago virga var. gigantea, Solidago viragaurea var. asiatica, Saussurea grandifolia, Ainsliaea acerifolia - were used for our experiments. Analytical methods for simultaneous determination of the caffeoylquinic acids (3,4-di-O-caffeoylquinic acid, 3,5-di-O-dicaffeoyl-epi-quinic acid, 3,5-di-O-caffeoylquinic acid, 4,5-di-O-caffeoylquinic acid, 5-O-caffeoylquinic acid, 3-O-caffeoylquinic acid, 3-O-p-coumaroyl-caffeoylquinic acids) were established for chwinamul. The kinds of constituents were identified from HPLC chromatograms and it was possible to calculate the percentage (w/w) of seven of these compounds in the dried plants and in the extracts. The proportion of caffeoylquinic acids in the extracts ranged from 20.25 to 38.35%. Since it is known that peroxynitrite (ONOO(-))-scavenging is beneficial for amelioration of obesity, diabetes mellitus, atherosclerosis and even Alzheimer's disease, assays for peroxynitrite-scavenging activity were performed on the seven chwinamul plants. Of the tested extracts, the MeOH extract of A. acerifolia had the most potent effect (IC(50) 1.49 +/- 0.68 microg/mL). These results suggest that chwinamul vegetables can be used for treatment or prevention of peroxynitrite-related diseases.

Archives of Pharmacal Research 32(10): 1361-1367 (2009). DOI 10.1007/s12272-009-2003-6.

Available online at http://link.springer.com/article/10.1007%2Fs12272-009-2003-6

Further information: agungnug19@gmail.com

Thursday, 28 November 2013

Two New Flavonol Glycosides from Lamium amplexicaule L. and Their in vitro Free Radical Scavenging and Tyrosinase Inhibitory Activities

Abstract
Two new flavonol glycosides, kaempferol 3-O-[β-D-glucopyranosyl-(1→4)][α-L-rhamnopyranosyl-(1→6)]-β-D-glucopyranoside and quercetin 3-O-[β-D-glucopyranosyl-(1→4)][α-L-rhamnopyranosyl-(
1→6)]-β-D-glucopyranoside, together with three known flavonoids were isolated using column chromatography from the aerial parts of Lamium amplexicaule (Labiatae). In addition,
the five isolates were evaluated for their in vitro free radical scavenging (EC50 values, 14.1–63.9 μg/mL) and tyrosinase inhibitory activities (IC50 values, 110.4–193.5 μg/mL).

keywords:
Lamium amplexicaule, Labiatae, flavonol glycosides, free radical scavenging, tyrosinase inhibitors

Planta Medica 75(4): 364-366 (2009). DOI: 10.1055/s-0028-1112216.

Available online at https://www.thieme-connect.com/DOI/DOI?10.1055/s-0028-1112216

For further information: agungnug19@gmail.com