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Your search keyword '"Duong, Thi-Kim-Yen"' showing total 3 results
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3 results on '"Duong, Thi-Kim-Yen"'

1. Jasminanthoside – a new pregnane-steroid from Jasminanthes tuyetanhiae.

Author

Duong, Thi-Kim-Yen, Nguyen, Nhat-Nam, Nguyen, Ngoc-Tin, Tran, Huu-Duy, Nguyen, Kim-Phi-Phung, Nguyen, Thi-Hoai-Thu, Vo, Thi-Nga, and Nguyen, Thi-Anh-Tuyet

Subjects
ETHYL acetate, CHEMICAL structure, APOCYNACEAE, ACARBOSE, DATA analysis, PREGNANE
Abstract

A new pregnane steroid, jasminanthoside (1), together with three known compounds, telosmoside A7 (2), syringaresinol (3), and methyl 6–deoxy–3–O–methyl–β–D–allopyranosyl–(1→4)–β–D–oleandropyranoside (4) were isolated from the ethyl acetate extract of Jasminanthes tuyetanhiae roots collected in Vietnam. Their chemical structures were elucidated by NMR and MS spectroscopic data analysis along with the comparison of their data with the published ones in the literature. Although 4 was a known compound, its full NMR data were reported for the first time. All isolated compounds, evaluated for their α-glucosidase inhibition, showed activities stronger than the positive control acarbose. Among them, 1 was the best with the IC50 value of 7.41 ± 0.59 µM. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Enhanced photocatalytic performance of TiO2 through a novel direct dual Z-scheme design

Author

Duong Thi Kim Yen, Fitri Nur Indah Sari, and Jyh-Ming Ting

Subjects
Materials science, Nanocomposite, General Physics and Astronomy, 02 engineering and technology, Surfaces and Interfaces, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Photochemistry, 01 natural sciences, Redox, 0104 chemical sciences, Surfaces, Coatings and Films, Photocatalysis, Degradation (geology), 0210 nano-technology, Photodegradation, Absorption (electromagnetic radiation), Ternary operation, Visible spectrum
Abstract

A novel ternary TiO2/MoO3/g-C3N4 nanocomposite photocatalyst has been synthesized and shown to exhibit a direct dual Z-scheme photodegradation mechanism. The TiO2/MoO3/g-C3N4 nanocomposite catalyst outperforms its constituents for methylene blue degradation. The highest degradation rate constant of 0.0303 min-1 is about 3.9 times greater than that of TiO2. The improved photocatalytic activity is attributed to the enhanced visible light absorption from the g-C3N4 and α-MoO3, enhanced photogenerated hole/electron separation primarily in the TiO2 and α-MoO3, and enhanced fast charge transfer due to the existence of oxygen vacancies. The photodegradation mechanism is explained using a direct dual Z-scheme. This work affords a new insight towards designing highly efficient Z-scheme photocatalysts with enhanced visible light absorption, efficient photogenerated hole/electron separation, and strong redox ability.

Published
2020

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