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'y Radiolysis' in keywords Facet   Publication Year 1975  [X]
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1975[X]
1Author    Requires cookie*
 Title    Radiation Chemistry o f Carbohydrates, VI* y-Radiolysis o f Glucose in Deoxygenated N20 Saturated Aqueous Solution  
 Abstract    M ir a l D i z d a r o g l u , D i e t e r H e n n e b e r g , G e r h a r d S c h o m b u r g , a n d Cl e m e n s v o n S o n n t a g In the y -radiolysis of deoxygenated N 20 -saturated aqueous solutions of D-glucose (10-2 M, 1 • 1019 — 4 • 1019 eV/g, dose rate 4.3 • 1018 eV/g • h at 25 °C), the following products have been identified: Gluconic acid (1), 2-deoxy-gluconic acid (2), arabinose (3), 2-deoxy-ribose (4), 5-deoxy-gluconic acid (5), glucosone (6), 3-deoxy-glucosone (7), 3-keto-glucose (8), [2-deoxy-3-keto-glucose (9), 4-deoxy-3-keto-glucose (10)]3, 4-keto-glucose (11), 3-deoxy-4-keto-glucose (12), 5-deoxy-4-keto-glucose (13), 5-keto-glucose (14), 2-deoxy-5-keto-glucose (15), 4-deoxy-5-keto-glucose (16), 6-deoxy-5-keto-glucose (17), glueo-hexodialdose (18), 5-deoxy-xylo-hexodialdose (19), ribose (20), xylose (21), erythrose (22), threose (23), 3-deoxy-pentulose (24), 2-butanone-(l,4)-diol (25), and dihydroxy-acetone (26). G-values were also determined. In the primary processes OH radicals and H atoms from the radiolysis of the solvent water abstract carbon bound hydrogen atoms from D-glucose to give all six possible primary glucosyl radicals. The observed products are formed in disproportionation reactions of the primary glucosyl radicals (1, 6, 8, 11, 14, 18) or of sugar radicals which originate from the primary glucosyl radicals by water elimination (2,, rearrangements (5, 14, 15), or loss of carbon monoxide (3, 4, 20). Products 1-5 and probably 20 have primary glucosyl radicals with the odd electron at C-l as precursors. Radicals with the free spin at C-2 give rise to the products 6 and 7. Attack at C-3 yield products 8-10, at C-4 products 11-13, at C-5 products 14-17, and an attack at C-6 products 18 and 19. Products 21-26 are formed in very low yields and hence are of minor importance. Their mechanism of formation has not been investigated. 
  Reference    (Z. Naturforsch. 30b, 416—425 [1975]; received January 28 1975) 
  Published    1975 
  Keywords    D-Glucose, y-Radiolysis, Glucosyl Radicals, Deoxy-sugars, Keto-glucoses 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0416.pdf 
 Identifier    ZNB-1975-30b-0416 
 Volume    30 
2Author    Requires cookie*
 Title    Radiation Chemistry of DNA-Model Compounds, VII* On the Formation of 5-Deoxy-D-erythro-pentos- 4-ulose and the Identification of Twelve Further Products from y-Irradiated Aqueous Solutions of Ribose-5-phosphate  
 Abstract    L o t h a k S t e l t e r , C l e m e n s v o n S o n n t a g , a n d D i e t r i c h S c h u l t e -F r o h l i n d e Different mechanisms are considered to explain the formation of 5-deoxy-D-erythro-pentos-4-ulose in the y-radiolysis of ribose-5-phosphate in aqueous solution. On the basis of deuterium labelling experiments one mech­ anism involving an enol as an intermediate could be excluded. The identification of twelve further radio-lysis products from ribose-5-phosphate is reported. 
  Reference    (Z. Naturforsch. 30b, 656—657 [1975]; received February 19 1975) 
  Published    1975 
  Keywords    y-Radiolysis, Ribose-5-phosphate, Carbohydrates, Radical Reactions, Radical Cations 
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 DEBUG INFO      
 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0656_n.pdf 
 Identifier    ZNB-1975-30b-0656_n 
 Volume    30