Identification and -glucosidase inhibitory activity evaluation of two new coumarins derived from J. R. Drumm.

Five coumarins were isolated from the heartwood of , which included two newly discovered compounds, namely 11-hydroxypopulene E () and mansorin D (), along with three previously identified compounds. The structures were determined through the utilisation of comprehensive spectroscopic data, ECD calculations, and a thorough comparison with existing literature data. The -glucosidase inhibitory activities of all isolated compounds were assessed in yeast.

Tinctoric acid A-B, two new hopan-type triterpenoids from the Vietnamese lichen, (Despr. ex Nyl.) hale with α-glucosidase inhibitory activity.

Two new hopan-type triterpenoids, namely tinctoric acid A-B (), were isolated from the lichen (Despr. ex Nyl.) Hale.

Tinctorin, a new spiroterpenoid from the lichen (Despr. ex Nyl.) Hale growing in Vietnam.

A new spiroterpenoid, namely tinctorin (), along with one known compound, norreticulatin (), were isolated from the lichen (Despr. ex Nyl.) Hale.

α-Glucosidase inhibition of sesquiterpenoids from the heartwood of Mansonia gagei.

Nine undescribed sesquiterpenoids, along with ten known compounds, were isolated from the ethyl acetate extract of Mansonia gagei heartwood. Their structures were determined by spectroscopic data analysis (FTIR, 1D, 2D NMR, and HRESIMS), and their absolute configurations were established by ECD calculation. The isolated compounds were evaluated for their inhibitory effect against α-glucosidase from yeast.

Gagones A-F: Six prenylated chalcones from the heartwood of Mansonia gagei.

Six undescribed prenylated chalcones gagones A-F were isolated from the acetone fraction of Mansonia gagei heartwood. Their structures were unambiguously established based on spectroscopic analysis (HRESIMS, 1D and 2D NMR), as well as comparison to literature data. Their absolute configurations were elucidated using DP4 and electronic circular dichroism calculations.

A new neolignan and a new phenolic acid from the heartwood of J.R. Drumm.

One new neolignan () and one new phenolic compound (), together with four known compounds (- were isolated from the heartwood of . Their structures were elucidated by extensive spectroscopic analyses, including 1D and 2D NMR and HRESIMS. The absolute configuration of was established based on the DP4+ protocol and by comparison of experimental and calculated ECD spectra.

Impacts of effluent from different livestock farm types (pig, cow, and poultry) on surrounding water quality: a comprehensive assessment using individual parameter evaluation method and water quality indices.

Water pollution within and nearby different livestock farm types was assessed comprehensively for the first time in Vietnam. The samples of wastewater, ground water, and surface water were collected from 130 pig farms, 80 poultry farms, and 40 cow farms. Water quality was first assessed by individual parameter evaluation method in which measured values of water quality parameters were compared with the permissible limits in the national technical regulations on livestock's effluent (QCVN 62), surface water quality, and ground water quality.