Garcinia xanthochymus has been widely used in traditional Chinese medicine for expelling worms and removing food toxins. Bioassay-guided fractionation of an EtOAc-soluble extract of G. xanthochymus stem bark led to the isolation of six new xanthones. Their structures were elucidated by spectroscopic methods, especially 2D-NMR techniques. Free-radical-scavenging activities of the isolated compou...

While screening for bioactive compounds from edible mushrooms, a new potent antioxidant, vialinin A (1), together with a known compound, ganbajunin B (2), and a mixture of ganbajunins D (3) and E (4), were isolated from the dry fruiting bodies of Thelephora vialis. The structure of 1, 5',6'-bis(phenylacetoxy)-1,1':4',1''-terphenyl-2',3',4,4''-tetraol, was elucidated by spectroscopic and chemica...

Guava fruit extracts were analyzed for antioxidant activity measured in methanol extract (AOAM), antioxidant activity measured in dichloromethane extract (AOAD), ascorbic acid, total phenolics, and total carotenoids contents. The ABTS, DPPH, and FRAP assays were used for determining both AOAM and AOAD, whereas the ORAC was used for determining only AOAM. Averaged AOAM [mM Trolox equivalent (TE)...

Serbian soybean genotype Ana was gamma irradiated at doses of 1, 2, 4, and 10 kGy in order to evaluate the influence of gamma irradiation on isoflavone (genistein, daidzein, and their glycosides genistin and daidzin) contents and hydroxyl radical scavenging effect (HRSE). The increase in genistin and daidzin contents as well as antioxidant activities was observed especially at doses of 4 and 10...

2,2-Diphenyl-1-picrylhydrazyl-ultra-high performance liquid chromatography-Q-time-of-flight mass spectrometry (DPPH-UPLC-Q-TOF/MS), as a rapid and efficient means, now was used for the first time to screen antioxidants from Selaginella doederleinii. The nine biflavone compounds were screened as potential antioxidants. The biflavones were structurally identified and divided into the three types,...

Phytochemical investigation of the aqueous extract of Pithecellobium clypearia afforded one novel compound, clypearoside A (1), and one new stereoisomer, (-)-(2S,3S)-epigallocatechin-7-gallate (2) and four known ones (3-6). Their structures were elucidated on the basis of spectroscopic data, especially 2D NMR, HRESIMS and ECD spectra. Compounds 2-4 showed strong activity against DPPH (diphenylp...

In continuation of our study the in vitro antioxidant activity of some novel quinoxaline derivatives was investigated by 1,1-diphenyl-2-picrylhydrazyl (DPPH) method with respect to ascorbic acid. To determine the antioxidant activity, a number of substituted indoxyls (3A-G), cyclic ketones (2A-G), and quinoxalines (1A-G) were synthesized by both microwave and conventional heating methods. The p...

A xanthone, 1,3,6,7-tetrahydroxy-xanthone (compound (1)) had been isolated from Garcinia benthami Pierre. The isolation was conducted through the chromatography technique and spectroscopy methods by spectroscophyc: mass spectrometry (LC-MS), infra red (IR), UV, 1H-NMR, 13C-NMR (1D and 2D-NMR). Antioxidant activity test by using DPPH (1,1diphenyl-2-picrylhydrazyl) method from the isolated compou...

BACKGROUND The potential of ascorbic acid and two botanical decoctions, green tea and cat's claw, to limit cell death in response to oxidants were evaluated in vitro. METHODS Cultured human gastric epithelial cells (AGS) or murine small intestinal epithelial cells (IEC-18) were exposed to oxidants - DPPH (3 microM), H2O2 (50 microM), peroxynitrite (300 microM) - followed by incubation for 24 ...

هدف: پژوهش حاضر با هدف ساخت برنامه داربست‌سازی انگیزشی و تعیین اثربخشی آن بر جهت‌گیری‌های هدفی ارزیابی‌های شناختیوالدین انجام شد. روش: پس از طراحی آموزشی داربست سازی اساس نقشه نگاری مداخله، به منظور بررسی شبه‌آزمایشی طرح پیش‌آزمون ـ پس‌آزمون همراه پیگیری گروه گواه استفاده جامعه آماری شامل تمامی والدین ­دانش‌آموزان پایه هشتم منطقة 4 آموزش پرورش شهر تهران نمونة نیز 30 مادر دارای فرزند کلاس هفتم ب...