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'Cyanogenic Glycosides' in keywords
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1983 (2)
1Author    V. W. Ray, R. H. DavisRequires cookie*
 Title    Biosynthesis of Cyanogenic Glycosides in Butterflies and Moths: Incorporation of Valine and Isoleucine into Linamarin and Lotaustralin by Zygaena and Heliconius Species (Lepidoptera)  
 Abstract    C -13 NMR data for linamarin and lotaustralin, obtained after feeding of either Zygaena Jilipendulae or Heliconius melpomone (Lepidoptera) with C-13 enriched valine and isoleucine respectively, indicate that intact units of amino acid with loss of the carboxyl group are incorporated during the biosynthesis o f these cyanogenic glycosides. 
  Reference    Z. Naturforsch. 38c, 583 (1983); received December 15 1982/M arch 16 1983 
  Published    1983 
  Keywords    Cyanogenic Glycosides, Linamarin, Lotaustralin, Biosynthesis, Lepidoptera 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0583.pdf 
 Identifier    ZNC-1983-38c-0583 
 Volume    38 
2Author    JonathanE. Poulton, Sun-In ShinRequires cookie*
 Title    Prunasin Biosynthesis by Cell-Free Extracts from Black Cherry (Prunus serotina Ehrh.) Fruits and Leaves  
 Abstract    Immature fruits and leaves o f black cherry (Prunus serotina Ehrh.) accumulate the cyanogenic glucoside prunasin (the /?-glucoside of (/?)-mandelonitrile). Cell-free extracts from these tissues catalysed the stereospecific glucosylation of (/?,S)-mandelonitrile to (/?)-prunasin at rates of 0.2 — 2.0 ^mol/h/mg protein. Uridine diphosphate glucose (ATm = 0.32rnM) acted as glucose donor. The optimum concentration of (/?,S)-mandelonitrile was 20 mM. Highest activity was exhibited at pH 7.0 —8.0 in Tris-phosphate buffer, and no additional cofactors were required. /?-Mercaptoethanol (14.5 mM), provided in the homogenization medium to prevent browning of homogenates, did not stimulate the rate o f prunasin production. In addition to (/?)-mandelo-nitrile (100%), significant activity was shown towards mandelamide (21%), benzyl alcohol (15%), mandelic acid (8%) and benzoic acid (153%), but not towards prunasin. Mandelonitrile glucosyltransferase activity was most stable at -20 °C in the presence o f 10% glycerol. 
  Reference    Z. Naturforsch. 38c, 369—374 (1983); received January 3 1983 
  Published    1983 
  Keywords    Black Cherry, Prunus serotina, Prunasin Biosynthesis, Cyanogenic Glycosides, O-Glucosyltransferase 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0369.pdf 
 Identifier    ZNC-1983-38c-0369 
 Volume    38