3897-89-0Relevant articles and documents
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Kaemmerer,Casacuberta
, p. 167,169,170 (1963)
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Preparation of artificial urushi via an environmentally benign process
Ikeda, Ryohei,Tanaka, Hozumi,Oyabu, Hiroshi,Uyama, Hiroshi,Kobayashi, Shiro
, p. 1067 - 1073 (2001)
"Artificial urushi" has been developed by laccase-catalyzed curing of new urushiol analogues. The analogues were designed and conveniently synthesized by regioselective acylation of phenol derivatives having a primary alcohol with unsaturated fatty acids using lipase as catalyst. The curing of the catechol derivative having a linolenoyl group proceeded in the presence of acetone powder from Chinese urushi, yielding the crosslinked film ("artificial urushi") with high hardness and gloss surface, which are comparable with those of natural urushi coating. The analogues obtained from vanillyl alcohol were also cured. FT-IR monitoring of the curing showed that the crosslinking mechanism was similar to that of the natural urushi. The curing of the urushiol analogues in the presence of starch-urea phosphate took place to give the artificial urushi consisting exclusively of synthetic compounds.
Phenolic constituents from the twigs of Betula schmidtii collected in Goesan, Korea
Park, Kyoung Jin,Cha, Joon Min,Subedi, Lalita,Kim, Sun Yeou,Lee, Kang Ro
, (2019/08/20)
Six undescribed phenolic derivatives along with thirty two known compounds were isolated from the twigs of Betula schmidtii. The chemical structures were characterized through extensive spectroscopic analysis and chemical methods. All known compounds were first isolated in this plant. The anti-inflammatory effect of the isolates was tested by measuring nitric oxide production in lipopolysaccharide-activated BV-2 cells. Isotachioside, 4-allyl-2-hydrophenyl 1-O-β-D-apiosyl-(1 → 6)-β-D-glucopyranoside, genistein 5-O-β-D-glucoside, and prunetinoside showed a slight potency to lower the NO production against LPS-activated microglia with IC50 values of 23.9, 25.3, 28.8, and 34.0 μM, respectively.
Temperature-Directed Biocatalysis for the Sustainable Production of Aromatic Aldehydes or Alcohols
Ni, Jun,Gao, Yan-Yan,Tao, Fei,Liu, Hong-Yu,Xu, Ping
supporting information, p. 1214 - 1217 (2018/01/27)
The biosynthesis of aromatic aldehydes and alcohols from renewable resources is currently receiving considerable attention because of an increase in demand, finite fossil resources, and growing environmental concerns. Here, a temperature-directed whole-cell catalyst was developed by using two novel enzymes from a thermophilic actinomycete. Ferulic acid, a model lignin derivative, was efficiently converted into vanillyl alcohol at a reaction temperature at 30 °C. However, when the temperature was increased to 50 °C, ferulic acid was mainly converted into vanillin with a productivity of 1.1 g L?1 h?1. This is due to the fact that the redundant endogenous alcohol dehydrogenases (ADHs) are not active at this temperature while the functional enzymes from the thermophilic strain remain active. As the biocatalyst could convert many other renewable cinnamic acid derivatives into their corresponding aromatic aldehydes/alcohols, this novel strategy may be extended to generate a vast array of valuable aldehydes or alcohols.