- ARBUTIN AND SUCROSE IN THE LEAVES OF THE RESURRECTION PLANT MYROTHAMNUS FLABELLIFOLIA
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Forty-two per cent of the desiccated leaves of Myrothamnus flabellifolia was extracted in methanol, and contained two major components, sucrose (30percent) and arbutin (65percent).Its arbutin content can probably explain the purported medicinal properties of this plant.By analogy with other desiccation-tolerant organisms, sucrose and arbutin may be partially responsible for the extreme resistance of Myrothamnus to environmental stress.Key Word Index - Myrothamnus flabellifolia; Myrothamnaceae; resurrection plant; arbutin; sucrose.
- Suau, Rafael,Cuevas, Ana,Valpuesta, Victoriano,Reid, Michael S.
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- Preparation method of glucoside and derivatives thereof
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The invention discloses a preparation method of glucoside and derivatives thereof. According to the method, all hydroxyl groups on a sugar molecule structure are acetylated, a ligand containing phenolic hydroxyl groups is prepared at the same time, then boron trifluoride-diethyl ether is used as a catalyst, the two substances are condensed to obtain tetraacetylated glucoside, and finally acetyl protecting groups are removed to obtain the required glucoside. The method can selectively catalyze hemiacetal hydroxyl of monosaccharide to react with hydroxyl to obtain glucoside, and the product is single. The method is simple in production operation and low in equipment requirement, can be used for synthesizing glucoside and derivatives thereof with similar structures, is green and environment-friendly, and can be used for large-scale production.
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Paragraph 0040; 0042
(2020/04/02)
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- Synthesis method for beta-arbutin
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The invention discloses a synthesis method for beta-arbutin and belongs to the field of synthesis of daily chemical additives. The invention aims to provide a synthesis method of which the yield can reach 81 to 90 percent. According to the method, tetra-acetyl arbutin is acetylated, and then a product is de-acetylated, wherein the tetra-acetyl arbutin is obtained by reaction among penta-acetyl glucopyranose, hydroquinone and derivatives thereof under ionic liquid. The synthesis method for the beta-arbutin can be used for synthesizing the beta-arbutin in daily chemical products.
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Paragraph 0024; 0025
(2017/10/13)
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- Effective friedel-crafts acylations of O- and C-arylglycosides with triflic acid
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Triflic acid is well known not only as a Friedel-Crafts promoter, but also as a deglycosidation reagent. In this study, we promote effective Friedel-Crafts acylations for O- or C-arylglucosides without deglycosidation and check their inhibitory activities for β-glucosidase.
- Hashimoto, Makoto,Takahashi, Miho
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body text
p. 227 - 231
(2009/09/06)
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