Pseudoamaolide P, a 1,2:3,4:9,10:9,19-tetraseco-cycloartane triterpene spiroketal lactone from seeds of Pseudolarix amabilis.

A 1,2:3,4:9,10:9,19-tetraseco-cycloartane triterpene spiroketal lactone, pseudoamaolide P (1), two new labdane-type diterpenoids, pseudoamains A and B (2-3), and four known cembrane-type diterpenoids (4-7) were isolated from the seeds of Pseudolarix amabilis. The structures of these compounds were elucidated by spectroscopic analyses, including HRESIMS, 1D-, and 2D-NMR. The anti-inflammatory activities of the compounds were evaluated by suppressing the transcription of the NF-κB-dependent reporter gene in LPS-induced 293 T/NF-κB-luc cells. All compounds do not show potent activity.

[Diterpenoid constituents in Pseudolarix amabilis and their antitumor activities in vitro].

By various chromatographic techniques and extensive spectroscopic methods, 17 abietane diterpenoids were isolated from the dichloromethane fraction of the 95% ethanol cold-soak extracts of the seeds of Pseudolarix amabilis, namely pseudoamaol A(1), 12α-hydroxyabietic acid(2), 12-methoxy-7,13-abietadien-18-oic acid(3), 13-hydroxy-8,11,13-podocarpatrien-18-oic acid(4), 15-hydroxy-7,13-abietadien-12-on-18-oic acid(5), 8(14)-podocarpen-13-on-18-oic acid(6), holophyllin K(7), metaglyptin B(8), 7α-hydroxydehydroabietinsaure-methylester(9), 7-oxodehydroabietic acid(10), 15-hydroxy-7-oxodehydroabietinsaure-methy-lester(11), 15-methoxydidehydroabietic acid(12), 7-oxo-15-hydroxy-dehydroabietic acid(13), 15-hydroxydehydroabietic acid(14), 8,11,13-abietatriene-15,18-diol(15), 8,11,13-abietatriene-15-hydroxy-18-succinic acid(16), and 7ß-hydroxydehydroabie-tic acid(17). Compound 1 was a new compound. The isolated compounds were evaluated for their antitumor activities(HepG2, SH-SY5Y, K562), and compounds 8 and 17 showed potential cytotoxic activity against K562 cells, with IC_(50) values of 26.77 and 37.35 µmol·L~(-1), respectively.

[Chemical constituents of Physalis minima].

Fifteen compounds(1-15) were isolated from the 95% EtOH extract of the whole herb of Physalis minima by various chromatography techniques including silica gel, Sephadex LH-20, middle chromatogram isolated gel(MCI), octadecyl silica(ODS), and semi-preparative high performance liquid chromatography(HPLC). Their structures were elucidated by infrared spectroscopy(IR), ultraviolet spectroscopy(UV), high-resolution electrospray ionization mass spectrometry(HR-ESI-MS), nuclear magnetic re-sonance(NMR), and circular dichroism(CD) as(5S)-5,11-dihydroxy-3-methyl-5-pentylfuran-2(5H)-one(1), withaphysalin R(2), withaphysalin Q(3), withaphysanolide A(4), phaseic acid(5), grasshopper ketone(6), 3S,5R-dihydroxy-6S,7-megastigmadien-9-one(7), vanillic acid(8), 2-trans,4-trans-abscisic acid(9), capillasterolide(10), 5,3'-dihydroxy-3,7,4'-trimethoxyflavone(11),(-)-loliolide(12), 4-hydroxyacetophenone(13), acetosyringone(14), and aurantiamide acetate(15). Compound 1 was a new butenolide, and compounds 5-7 and 10-12 were isolated from the Physalis for the first time. Compounds 4, 13, and 15 were isolated for the first time from P. minima. Moreover, their anti-inflammatory activity was evaluated in vitro. Compound 12 was found to possess an inhibitory effect on the transcription of an NF-κB-dependent reporter gene in LPS-induced 293 T/NF-κB-luc cells at 10 µmol·L~(-1), showing an inhibitory rate of 62.31%±4.8%.

An Fe-V@NiO heterostructure electrocatalyst towards the oxygen evolution reaction.

The development of a nonprecious and Earth-abundant electrocatalyst with high electrocatalytic activity for the oxygen evolution reaction (OER) is an emerging hot issue and remains a grand challenge. In the present work, we proposed a facile strategy to construct ultrathin NiO nanosheets decorated with Fe-V nanoparticles on nickel foam (Fe-V@NiO/NF) for use as an OER electrocatalyst. Due to the 3D rational configuration, the Fe-V@NiO/NF with a heterostructure shows excellent electrocatalytic activity towards the OER. Interestingly, it is found that in situ oxidation by galvanostatic electrolysis in alkaline solution is beneficial to enhance the OER performance. After 10 h of electrolysis, a current density of 50 mA cm-2 is achieved at a low overpotential of 271.1 mV. This is because during the in situ oxidation process, iron and vanadium ions insert into the NiO lattice and lead to the generation of highly active α-FeOOH and an amorphous (oxy)-hydroxide layer. Additionally, the charge transfer resistance dramatically reduces with the prolonging of oxidation time.

A new ascorbic acid derivative and two new terpenoids from the leaves and twigs of Rhododendron decorum.

The phytochemical study of the ethanol extract of the leaves and twigs of Rhododendron decorum afforded a new ascorbic acid derivative (1), a new ionone analogue (2), a new ursane-type triterpenoid glucoside (3), and four known compounds (4-7). The structures were elucidated by spectroscopic analyses, including HRESIMS, 1D, and 2D NMR. The anti-neuroinflammatory activities of the compounds were evaluated by measuring inhibitory effects of LPS-induced NO production in BV2 cells.

Antinociceptive Diterpenoids from the Leaves and Twigs of Rhododendron decorum.

Three new leucothane-type (1-3), two new micrathane-type (4, 5), eight new grayanane-type diterpenoids (6-13), and four known compounds were obtained from the ethanol extract of the leaves and twigs of Rhododendron decorum. The structures were determined based on NMR spectra, quantum chemical calculations, and X-ray crystallography. The antinociceptive activities of compounds 1, 3, 4, 6, 8, 10-13, and 15-17 were evaluated via the acetic acid-induced writhing test. Compounds 1, 8, 11-13, and 15 exhibited significant antinociceptive activities. In particular, 12 and 15 were found to be effective at doses of 0.8 and 0.08 mg/kg, respectively.