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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Journal Article

Journal article

Flavone polyphenols dominate in Thymus schimperi Ronniger: LC–ESI–MS/MS characterization and study of anti-proliferative effects of plant extract on AGS and HepG2 cancer cells  [2017]

Desta, Kebede Taye; A.M. Abd El-Aty; Ahmet Hacımüftüoğlu; Gon Sup Kim; et al.

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Thymus schimperi is a highly localized and a rare plant endemic to Ethiopia. An optimized and validated high-performance liquid chromatography-electrospray ionization-tandem mass spectrometry (HPLC–ESI–MS/MS) method was applied to characterize 23 polyphenolic compounds found in ethyl acetate extracts of the plant. From those, flavones dominated and luteolin was the major component contributing 21.83% of the total composition (or 46.05±0.59g/kg of fresh sample weight). Validation data showed a determination coefficient (R2)≥0.997. Limits of detection (LOD) and quantification (LOQ) were 0.03–0.97 and 0.11–3.23mg/L, while recovery values spiked at 5 and 50mg/L were between 70.89–115.39 and 67.65–120.19%, respectively. Except for caffeic acid and epicatechin gallate, the relative standard deviations (%RSDs) were far below 15%, showing acceptable precision values. The plant extracts inhibited cell proliferation and induced cell death in human gastric adenocarcinoma (AGS) and liver hepatocellular carcinoma (HepG2) cancer cells. This is the first report of polyphenolic components from T. schimperi being characterized using HPLC–ESI–MS/MS. Being components of many edible vegetables, fruits, and spices, the identified polyphenols suggest that T. schimperi could be a potential food with promising health benefits.

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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2017
Volume:
1053
Start Page:
1
End Page:
8
Publisher:
Elsevier B.V.
All titles:
" Flavone polyphenols dominate in Thymus schimperi Ronniger: LC–ESI–MS/MS characterization and study of anti-proliferative effects of plant extract on AGS and HepG2 cancer cells "

From the journal

Journal of Chromatography B

ISSN : 1570-0232