Results 191 to 200 of about 3,448 (238)

Gallotannins and Related Polyphenols fromPistacia weinmannifolia

Planta Medica, 2000
Two new gallotannins, pistafolins A (1) and B (2), were isolated from the leaf extract of Pistacia weinmannifolia. Their structures were determined by spectral methods. Four known gallotannins (3-6), seven known flavonoid glycosides (7-13), along with 1-O-beta-D-(6'-O-galloyl)-glucopyranosyl-3-methoxy-5-hydroxybenzen e (14), gallic acid (15), methyl ...
A J, Hou, L Y, Peng, Y Z, Liu, Z W, Lin, H D, Sun   +4 more
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Gallotannine und Ellagen-gerbstoffe

1956
Wenn uber Fortschritte der Chemie der Gallotannine berichtet werden soll, so mus ein Ausgangspunkt gewahlt werden, von dem aus die neu gewonnenen Erkenntnisse geschildert werden. Das ist in unserem Falle nicht schwer. Emil Fischer hatte fur das chinesische Gallotannin (aus den Blattgallen von Rhus semialata) und das turkische Gallotannin (aus den ...
openaire   +1 more source

Preparation of gallotannin loaded chitosan/zinc oxide nanocomposite for photocatalytic degradation of organic dye and antibacterial applications.

International Journal of Biological Macromolecules, 2023
D. Bharathi, S. Dhanasekaran, R. Varshini, S. Bhuvaneswari, G. Periyasami, Saravanan Pandiaraj, Jintae Lee, R. Ranjithkumar   +7 more
semanticscholar   +1 more source

Gallotannin Determination Using HPLC

2003
Pipette 1 ml of supernatant A (see Section 5) into the above mentioned culture tubes, remove acetone in a vacuum oven adjusted at 40°C (pressure 300 mbar). It takes about 3 h to remove acetone. Acetone can also be removed by flushing with nitrogen gas. Dry the contents completely in a heating block at 40°C by flushing with nitrogen.
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Gallotannin Biosynthesis: A New β-Glucogallin-dependent Galloyltransferase from Sumac Leaves Acylating Gallotannins at Positions 2 and 4

Journal of Plant Physiology, 1999
Summary Leaves of Saghorn sumac (Rhus typhina) contain. several isoenzymes that catalyze the R-glucogallin (1-O-galloyl-β-D-glucose)-dependent transformation of 1,2,3,4,6-penta-O-galloyl-β-D-glucose to complex gallotannins. Among these, a new galloyltransferase has been isolated that preferentially acylated the 4-position of the substrate, followed ...
Ruth Niemetz, Georg G. Gross
openaire   +1 more source

Chitosan immobilized Chinese gallotannin: A potential adsorbent to enrich the rare metals Ge (Ⅳ), Ga (Ⅲ), and In (Ⅲ)

Journal of Environmental Chemical Engineering, 2023
Cheng Huang, Kun Li, Hong Zhang, Wenwen Zhang, Yanlin Sun, Shujie Xing, Ying Shao, Jing Zhu, Yalan Chen, Long Chen   +9 more
semanticscholar   +1 more source

A New Gallotannin from the Extractives of Camellia oleifera Fruit Shell

Chemistry of Natural Compounds, 2023
Yisha He, Chun Gong, Xiaobin Lei, Wei Gao, Jian Yang, Y. Bae, Jin-Kyu Kim, C. Seo, Se-Yeong Park, Sun-Eun Choi, Bao-Tong Li   +10 more
semanticscholar   +1 more source

Mechanistic Studies on the Antidiabetic Properties of Gallotannins

Current Pharmaceutical Design
The escalating prevalence of type 2 diabetes (T2DM) has emerged as a global public health dilemma. This ailment is associated with insulin resistance and heightened blood glucose concentrations. Despite the rapid advancements in modern medicine, where a regimen of medications is employed to manage blood glucose effectively, certain treatments ...
Xueqing, Li, Wei, Wu, Yuting, Liu, Jiale, Zhao, Yibei, Gui, Hailin, Wang, Lijun, Wang, Yiyang, Luo, Gang, Zhou, Yumin, He, Chengfu, Yuan   +10 more
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Biosynthesis and Biodegradation of Complex Gallotannins

1999
According to an already classical definition formulated by Freudenberg in 1920,1 plant tannins are divided into condensed tannins (nowadays often referred to as proanthocyanidins), which are derived from C-C linked flavan-3-ol units, and into hydrolyzahle tannins. The latter are characterized by a central polyol moiety (β-D-glucose in most cases) whose
Ruth Niemetz, Joerg U. Niehaus, Georg G. Gross   +2 more
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Pyrethrin and Gallotannin in the Flowers of Peony

Nature, 1962
FROM a light petroleum extract of dried petals of peony (Peonia albiflora Pall.) an oily substance (74.08 per cent C, 9.94 per cent H) was isolated by means of nitromethane extraction. It comprises 0.13 per cent of the dry weight of petals and 18 per cent of light petroleum extracts and shows in the ultraviolet spectral region maxima at 227 and 280 mµ ...
I. CHMIELEWSKA, Z. KASPRZYK
openaire   +1 more source