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Your search keyword '"Ouyang, Ming-An"' showing total 6 results
Start Over Author "Ouyang, Ming-An" Journal journal of chemistry
6 results on '"Ouyang, Ming-An"'

1. Chemically Diverse Secondary Metabolites from Davidia involucrata (Dove Tree)

Author

Song, Li-Yan, Lin, Ran, Wu, Zu-Jian, and Ouyang, Ming-An

Subjects
Article Subject
Abstract

Dove tree, Davidia involucrata Baill. which is endemic in western China, is not only one of the best known relict species of the tertiary, but also a famous ornamental plant with dove-shaped flowers. A diverse array of secondary metabolites have been isolated and identified from Davidia involucrata. The 58 structures of the secondary metabolites were presented and classified as triterpenoids, tannins, phenolic compounds, lignans, flavonoids, alkaloids, and sterol. In addition, the biosynthetic route of some triterpenoids was proposed. Moreover, the advances in the discovery of unprecedented compounds and uncovering of notable bioactivities were highlighted in this review.

Published
2016
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5. Evaluation of Anti-MRSA and Xanthine Oxidase Inhibition Activities of Phenolic Constituents from Plumula nelumbinis.

Author

Ding, Xiao, Ouyang, Ming-An, and Shen, Yuan-Shuai

Subjects
*METHICILLIN-resistant staphylococcus aureus, *XANTHINE oxidase, *ENZYME inhibitors, *PHENOLS, *NYMPHAEACEAE, *FLAVONOIDS
Abstract

Isolation of metabolites from Plumula nelumbinis led to the discovery of eleven compounds, including six flavonoids and five phenolderivatives. Their structures have been determined on the basis of chemical and spectroscopic data. Most of them, such as compounds 1, 4, 6, 8, and 10, have shown inhibitory activity against hospital-acquired methicillin-resistant Staphylococcus aureus (HA-MRSA). MICs of compound 8 against SA-200195 and SA-300150 were 2 μg/mL and 8 μg/mL, respectively. And the antioxidant activity of isolated compounds was determined by checking the scavenging activity against three different radicals: 2,2-diphenyl-1-picrydrazyl (DPPH) radical, hydroxyl radical (OH∙), and superoxide anion (O2∙-), as well as xanthine oxidase inhibition. All flavonoids showed strong antioxidant activity. And compound 6 displayed the highest inhibitory effect against xanthine oxidase with IC50 value of 8.2 μg/mL. [ABSTRACT FROM AUTHOR]

Published
2015
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6. Acetylcholinesterase Inhibitory Activities of Flavonoids from the Leaves of Ginkgo biloba against Brown Planthopper

Author

Ding, Xiao, Ouyang, Ming-An, Liu, Xiang, and Wang, Rei-Zhen

Abstract

Ginkgo biloba is a traditional Chinese medicinal plant which has potent insecticidal activity against brown planthopper. The MeOH extract was tested in the acetylcholinesterase (AChE) inhibitory assay with IC50 values of 252.1 μg/mL. Two ginkgolides and thirteen flavonoids were isolated from the leaves of Ginkgo biloba. Their structures were established on the basis of spectroscopic data interpretation. It revealed that the 13 isolated flavonoids were found to inhibit AChE with IC50 values ranging from 57.8 to 133.1 μg/mL in the inhibitory assay. AChE was inhibited dose dependently by all tested flavonoids, and compound 6 displayed the highest inhibitory effect against AChE with IC50 values of 57.8 μg/mL.

Published
2013
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