Role of SnO Nanoparticles for a Self-Forming Barrier Layer on a Mild Steel Surface in Hydrochloric Acid Medium Containing Leaf Extract.

The self-formation of a porous organic thin-film via corrosion inhibitor supports wide applications of carbon steel in industry. Unfortunately, serious damages could be concentrated to the pinhole and/or pore locations in the porous organic film, resulting in the localized corrosion even when an optimal concentration of organic corrosion inhibitors is used. In this work, SnO nanoparticles are used for producing the more robust barrier layer via the self-migration of nanoparticles, resulting in a higher corrosion resistance, smooth and uniform protective layer, as well as the existence of SnO in the protective layer that could directly affect the high inhibition performance.

Electrocatalytic CO Reduction by [Re(CO)Cl(3-(pyridin-2-yl)-5-phenyl-1,2,4-triazole)] and [Re(CO)Cl(3-(2-pyridyl)-1,2,4-triazole)].

The exploration of novel electrocatalysts for CO reduction is necessary to overcome global warming and the depletion of fossil fuels. In the current study, the electrocatalytic CO reduction of [Re(CO)Cl(-)], where - represents 3-(2-pyridyl)-1,2,4-triazole (Hpy), 3-(pyridin-2-yl)-5-phenyl-l,2,4-triazole (Hph), and 2,2'-bipyridine-4,4' dicarboxylic acidic (bpy-COOH) ligands, was investigated. In CO-saturated electrolytes, cyclic voltammograms showed an enhancement of the current at the second reduction wave for all complexes.

Berectones A and B: Two new rotenoids from the aerial parts of .

Two previously unreported rotenoids, berectones A and B ( and ), along with four known compounds, 3,3',4'-tri--methylellagic acid (), kaempferol (), 7,4'-dihydroxy-8-methoxyisoflavone (), and -caffeoyltyramine () were isolated from the aerial parts of . The structures of all isolated compounds were fully characterized using spectroscopic data, as well as comparison with the previous literature. Compound exhibited the strongest inhibitory activity toward glucosidase with IC value of 4.

Flavones from Growing in Vietnam and Their Alpha-Glucosidase Inhibitory Activity.

Kurz is widely used in folk medicine in Eastern Asia and is associated with various ethnopharmacological properties including hepatoprotective, antipyretic, analgesic, antidysenteric, and anthelmintic activities. Previous phytochemical investigations reported the presence of numerous triterpenes (mostly cycloartanes, ursanes, lupanes, and oleananes) along with dozens of flavonoids. However, the extracts of and isolated flavonoids have not been evaluated for their alpha-glucosidase inhibition.

Alpha-Glucosidase Inhibitory Diterpenes from Growing in Vietnam.

Bioactive-guided phytochemical investigation of L. growing in Vietnam led to the isolation of five -atisanes, one --atisane, and one lathyrane (ingol-type). The structures were elucidated as -131617-tetrahydroxyatisane (), ethyl -3,4--4,16,17-trihydroxyatisane-3-carboxylate (), -atisane-3-oxo-16,17-acetonide (), -3-acetoxy-16,17-dihydroxyatisane (), -16,17-dihydroxyatisane-3-one (), calliterpenone (), and ingol 12-acetate ().

A new diphenyl ether from Hale growing in Vietnam.

Chemical investigation of the lichen Hale led to the isolation of one new diphenyl ether, parmetherine D (), along with eight known compounds (). The structures were determined by analysis of MS and NMR data and by comparison with the literature. Compounds , , and were evaluated for -glucosidase inhibition.

Two new phenolic compounds from the lichen growing in Vietnam.

Two new phenolic compounds, cristiferides A-B () together with six known compounds, 2,4-dihydroxyphthalide (), lecanoric acid (), orsellinic acid (), 5-chloroorsellinic acid (), methyl haematommate (), and methyl β-orsellinate () were isolated from the lichen (Taylor) Hale (Parmeliaceae). The structures of isolated compounds were identified from its spectroscopic data and by comparison with the literatures. Compounds - and were evaluated for alpha-glucosidase inhibition.

A new diterpenoid from the leaves of .

A new diterpenoid, phyllane C (), along with three known compounds, ovoideal E (), spruceanol (), and fluacinoid B () were isolated from the leaves of growing in Thailand. The structures were determined by analysis of their MS and NMR data as well as by comparison with literature values. DFT-NMR chemical shift calculations and subsequent DP4/DP4+ probability methods were applied to define the relative configuration of .