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1997 (1)
1978 (1)
1Author    Purusotam Basnet3, TetsuyaM. Atsunob, Richard Neidlein3Requires cookie*
 Title    Potent Free Radical Scavenging Activity of Propol Isolated from Brazilian Propolis  
 Abstract    We evaluated free radical scavenging activity of the water, methanol and chloroform ex­ tracts of propolis in l,l-diphenyl-2-picrylhydrazyl (DPPH) free radical and xanthine-xanthine oxidase (XO D) generated superoxide anion assay systems. The free radical scavenging activ­ ity guided fractionation and chemical analysis led to the isolation of a new compound, propol {3-[4-hydroxy-3-(3-oxo-but-l-enyl)-phenyl]-acrylic acid) from the water extract, which was more potent than most common antioxidants such as vitamin C and vitamin E (a-tocopherol) in these assay systems. 
  Reference    Z. Naturforsch. 52c, 828—833 (1997); received August 7/September 19 1997 
  Published    1997 
  Keywords    Propol, Propolis, Free Radicals, Superoxide Anion, Antioxidative Activity 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0828.pdf 
 Identifier    ZNC-1997-52c-0828 
 Volume    52 
2Author    E. F. Elstner, D. From, M. EyerRequires cookie*
 Title    Analysis of Different Mechanisms of Photosynthetic Oxygen Reduction  
 Abstract    Three mechanisms of oxygen reduction by chloroplast lamellae in the presence of autoxidizable electron acceptors can be differentiated by product analyis in the presence or absence of either dibromothymoquinone (DBMIB) or superoxide dismutase (SOD) : 1) H20 2 is the product of two-electron oxygen reduction by 2,3-dimethyl-5,6-methylenedioxy-p-benzoquinone, involving only photosystem II. This reaction is not inhibited by either DBMIB or SOD. 2) Superoxide anion, and H20 2 as the product of its dismutation, are products of monovalent oxygen reduction following autoxidation of certain low potential electron acceptors (herbicides) of photosystem I. These reactions are not inhibited by SOD but are blocked by DBMIB. 3) H20 2 is the product of and "apparent" two-electron photoreduction of oxygen, mediated by certain o-diphenols (caffeic acid). These reactions are inhibited by both DBMIB and SOD in­ dicating the involvement of photosystem I and of 0 2-as an intermediate in the H20 2 producing reaction. 
  Reference    Z. Naturforsch. 33c, 276 (1978); received February 6 1978 
  Published    1978 
  Keywords    Oxygen Reduction, Photosynthetic Electron Transport, Superoxide Anion, Peroxide Formation, Chloroplasts 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0276.pdf 
 Identifier    ZNC-1978-33c-0276 
 Volume    33