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1Author    Requires cookie*
 Title    Radiation Chemistry of Carbohydrates, X* y-Radiolysis of Crystalline D-Glucose and D-Fructose  
 Abstract    i z d a r o g l u , D. H e n n e b e r g , K . N e u w a l d , G. S c h o m b u r g and C. v o n S o n n t a g In stitu t für Strahlenchemie im M ax-Planck-Institut für Kohlenforschung, Mülheim a. d. Ruhr a-D-Glucose and ß-D-fructose were y-irratiated in the solid (polycrystalline) state at room temperature at doses o f 3.5 • 1020-4 .2 • 1021 eV g-1 (dose rate 1.16 • 1018 eV g_1 min_1). Carbohydrate products containing < 6 carbon atoms were identified and their G-values (in parentheses) measured. Glucose: Dihydroxyacetone (1) (0.05), 3-deoxy-tetrose (2) (O.OI5), l,4-dideoxy-2-pentu-lose (3) (0.05), 2,4-dideoxy-pentose (4) (O.O8 5), 2,4-dideoxy-pentonic acid (5), 2,3-dideoxy-pentos-4-ulose (6) (together 0.03a), threose (7), erythrulose (8), erythrose (9), erythronic acid (10) (together 0.04), l-deoxy-2-pentulose (11) (0.005), 2-deoxy-ribose (12) (0.25), 3-deoxy-pentosulose (13) (0.02), 3,5-dideoxy-hexonic acid (14) (0.02), 2,3-dideoxy-hexonic acid (15) (0.01), arabinose (16) (0.25), ribose (17), ribonic acid (18) (together 0.02), 2-deoxy-2-C-hydroxymethyl-pentonic acid (19) (0.06), 5-deoxy-gluconic acid (20), 2-deoxy-5-keto-glucose (21), 2-deoxy-gluconic acid (22), 2-deoxy-3-keto-glucose (23), 3-deoxy-glucosone (24), 3-deoxy-gluconic acid (25), 3-deoxy-4-keto-glucose (26), 3-deoxy-mannonic acid (27) (together 0.4). Identified but nor measured quantitatively were glucosone (28), 3-keto-glucose (29), 4-keto-glucose (30), 5-keto-glucose (31) and gluconic acid (32). G(H2) = 5.75; G (C02) = 0.7. Fructose: 7-9 (together 0.65), 3-deoxy-pentonic acids (37), 3-deoxy-pentosulose (38) (together 0.3), arabonic acid (39) (0.1), 18 (0.05), 6-deoxy-2,5-hexodiulose (40) (40). Identified but not measured quantitatively were glyceraldehyde (34), butanone-(3)-diol-(l,2) (35) and 2 -and 3-deoxy-hexodiuloses. G(H2) = 4.75, G (C02) = 0.05. Reaction schemes are proposed to account for the form ation of the products. The scission of the hemiacetal bond and of the C-H and C-C bonds next to it appears to be typical for solid state irradiations. The formation of deoxy-compounds is observed both in the solid state and in aqueous solution. The form ation o f dideoxy-compounds is only prominent in the solid state. In polycrystalline fructose a chain reaction is induced leading to 6-deoxy-2,5-hexodiulose (40). 
  Reference    (Z. Naturforsch. 32b, 213—224 [1977]; received October 27 1976) 
  Published    1977 
  Keywords    GC-MS, G-Values, Radical Reactions, Chain Reaction 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0213.pdf 
 Identifier    ZNB-1977-32b-0213 
 Volume    32 
2Author    P. H. Ad Jiev, S. P. Opov, B. B. Udevska, A.L D Yulgerov, StA., EvRequires cookie*
 Title    Terpenoids from a Black Sea Bryozoan Conopeum seuratum  
 Abstract    In the Bryozoan Conopeum seuratum six esterified monoterpene alcohols, three free monoter-pene alcohols, three monoterpene ketones, two monoterpene aldehydes, four esters of diterpene acids, two diterpene acids and one triterpene acid were identified, most of them new for marine organisms. Some non-terpenoid compounds were identified too. Preliminary investigation on the terpenoids of the Black Sea sponge Halichondria panicea was performed and its terpenoid com­ position was compared with those of C. seuratum. 
  Reference    Z. Naturforsch. 42c, 1019—1022 (1987); received February 26 1987 
  Published    1987 
  Keywords    Marine Invertebrates, Bryozoa, Terpenoids, GC/MS 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-1019.pdf 
 Identifier    ZNC-1987-42c-1019 
 Volume    42 
3Author    V. Bankova3, R. Christov3, A. Kujumgievb, M. C. Marcuccic, S. Popov3Requires cookie*
 Title    Chemical Composition and Antibacterial Activity of Brazilian Propolis  
 Abstract    Four samples of Brazilian propolis were investigated by GC/MS of different fractions. 32 volatile compounds, (10 of them new for propolis), as well as 12 more polar compounds (one of them new for propolis) were identified. Antibacterial activity was found in some propolis fractions. 
  Reference    Z. Naturforsch. 50c, 167 (1995); received January 10/January 20 1995 
  Published    1995 
  Keywords    Propolis, Polyphenols, Volatiles, GC/MS, Antibacterial Activity 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0167.pdf 
 Identifier    ZNC-1995-50c-0167 
 Volume    50 
4Author    M. C. Marcucci3, Jose Rodriguez, F. Ferreresc, V. B. An K O V, Robson Groto6, S. PopovdRequires cookie*
 Title    Chemical Composition of Brazilian Propolis from Sao Paulo State  
 Abstract    Two propolis samples from Sao Paulo State were investigated by GC/MS. 39 compounds were identified, 8 being new for propolis. Both samples showed some similarities in their qualitative composition. In one of them, coum aric acid and its prenylated derivatives predo­ minated, while in the other one triterpenic alcolhols were the main constituents. 
  Reference    Z. Naturforsch. 53c, 117 (1998); received O ctober 7/D ecem ber 8 1997 
  Published    1998 
  Keywords    Propolis, GC/MS, Phenolic Acids, Triterpenes 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0117.pdf 
 Identifier    ZNC-1998-53c-0117 
 Volume    53 
5Author    Mibal Dizdaroglu, Klaus Neuwald, ClemensVon SonntagRequires cookie*
 Title    Radiation Chemistry of DNA Model Compounds, IX* Carbohydrate Products in the y-Radiolysis of Thymidine in Aqueous Solution. The Radical-Induced Scission of the N-Glycosidic Bond  
 Abstract    In the y-radiolysis of deoxygenated N20-saturated aqueous solutions of thymidine (10-3 M, room temperature, dose rate 4 • 10 18 eV/g.h., dose 6.7 10 17 -3.3 • 10 18 eV/g) the following products (G-values in parentheses) have been identified: 2,5-dideoxy-pentos-4-ulose (1) (0.01), 2,4-dideoxy-pentodialdose (2) (0.02), 2,4-dideoxy-pentos-3-ulose (3) (0.03), 2,3-dideoxy-pentos-4-ulose (4) (0.01), 2-deoxy-pentos-4-ulose (5) (0.1), 2-deoxy-ribonic acid (6) (0.02) and thymine (8) (< 0.2). In the presence of oxygen (N20/02 80/20 v/v saturated) products 1-4 are absent, G (5) = 0.2, G (6) = 0.07 and G (8) < 0.4. Further-more, 2-deoxy-tetrodialdose (7) which is absent in deoxygenated solution is formed with a G-value of 0.03. Mechanisms are proposed to account for the scission of the N-glycosidic linkage. Product 6 is thought to be due to a primary OH radical attack at C-l' of the sugar moiety, 3 arises from an attack at C-3', 1, 4 and 5 from an attack at C-4', and 2 and 7 from an attack at C-5'. 
  Reference    (Z. Naturforsch. 31b, 227—233 [1976]; received September 24 1975) 
  Published    1976 
  Keywords    Thymidine, Radiolysis, Radical Reactions, GC-MS, DNA Model Compounds 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0227.pdf 
 Identifier    ZNB-1976-31b-0227 
 Volume    31 
6Author    Requires cookie*
 Title    Photolysis (A = 185 nm) of Liquid Acetaldehyde Dimethyl Acetal  
 Abstract    H e in z -P e t e r S c h u c h m a n n a n d C l e m e n s v o n S o n n t a g In stitut fü r Strahlenchemie im M ax-Planck-Institut für Kohlenforschung, Mülheim a. d. R uhr Deaerated liquid acetaldehyde dimethyl acetal has been photolyzed at X = 185 nm, and 28 products have been determined. The m ajor ones with their quantum yields are: methanol (0.59), methane (0.26), ethyl methyl ether (0.17), m ethyl vin yl ether (0.16), m ethyl form ate (0.14), ketene dimethyl acetal (0.1), ethane (0.06), hydrogen (0.06), and acetaldehyde (0.06). The m ajor prim ary processes are suggested to be the scission o f the C-OCH3 bonds (homolytic and molecular) and o f the O-CH3 bonds (homolytic). Minor processes are hydrogen elimination reactions and the scission o f the C-CH3 bond. 
  Reference    (Z. Naturforsch. 32b, 205 [1977]; received October 8 1976) 
  Published    1977 
  Keywords    UV, GC-MS, Quantum yields, Radical Reactions, Fragm entation Processes 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0205.pdf 
 Identifier    ZNB-1977-32b-0205 
 Volume    32 
7Author    JohnT. Simpson, PaulJ. Weldon, ThomasR. SharpRequires cookie*
 Title    Identification of Major Lipids from the Scent Gland Secretions of DumeriFs Ground Boa {Acrantophis dumerili Jan) by Gas Chromatography-Mass Spectrometry  
 Abstract    The scent gland secretions of Dumeril's ground boa (Acrantophis dumerili), pooled from two adult males and a female, were analyzed by gas chromatography-mass spectrometry. 2-Hydroxy-propanoic acid, hexadecanoic acid, as-9-octadecenoic acid, octadecanoic acid, cholesterol, and 5-cholesten-3-one were indicated. These results are compared with those obtained in analyses of the scent gland secretions of other snakes. 
  Reference    Z. Naturforsch. 43c, 914—917 (1988); received May 25/July 22 1988 
  Published    1988 
  Keywords    Ground Boa, Acrantophis dumerili, Scent Gland Secretions, GC-MS 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0914.pdf 
 Identifier    ZNC-1988-43c-0914 
 Volume    43 
8Author    W. Greenaway, J. May, T. Scaysbrook, F. R. WhatleyRequires cookie*
 Title    Identification by Gas Chromatography-Mass Spectrometry of 150 Compounds in Propolis  
 Abstract    Propolis was analyzed by gas chromatography-mass spectrometry for both its headspace volatiles and for the less volatile com ponents o f its alcoholic extract (propolis balsam). 181 peaks were located o f which 171 representing 150 compounds were identified, including 28 identified in propolis for the first time. The majority o f compounds were typical o f poplar bud exudate. 
  Reference    Z. Naturforsch. 46c, 111—121 (1991); received October 11 1990 
  Published    1991 
  Keywords    Propolis, Volatiles, Phenolic C om pounds, Poplar Bud Exudate, GC-MS 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0111.pdf 
 Identifier    ZNC-1991-46c-0111 
 Volume    46 
9Author    Rc Ía-V, Iguera, W. G. Reenaw Ay, F.R W HatleyRequires cookie*
 Title    Com position o f Propolis from Two Different Spanish Regions  
 Abstract    Propolis and propolis balsam from two different Spanish Regions were analyzed by GC-MS. The majori­ ty of the compounds were typical of poplar bud exudate of P. nigra. N o significant differences were found be­ tween the balsam and the entire propolis analyzed, apart from the components of beeswax added to the plant exu­ date by the bees. 
  Reference    Z. Naturforsch. 47c, 634—637 (1992); received April 13/June 15 1992 
  Published    1992 
  Keywords    Propolis, GC-MS, Bud Exudate, Poplar, Phenolic Com­ pounds 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0634_n.pdf 
 Identifier    ZNC-1992-47c-0634_n 
 Volume    47 
10Author    H. Schildknecht, B. Weber, K. DettnerRequires cookie*
 Title    Über Arthropodenabwehrstoffe, LXV Die Chemische Ökologie des Grundschwimmers Laccophilus minutus On Arthropode Defensive Compounds, LXV The Chemical Ecology of the Water Beetle Laccophilus minutus  
 Abstract    According to a GC-MS analysis of methylated extracts the abdominal tips of the water beetle Laccophilus minutus (Dytiscidae) contain four ß-hydroxyalkanoic acids. On the basis of MS and GC data another compound was assigned the structure of 6-octenoic acid. The same /S-hydroxyalkanoic acids, and in addition, traces of ^-hydroxyheptanoic acids were identified in dissected pygidial defensive glands after trimethylsilylation. Methyl 3,4-dihydroxyphenylacetate was recognized as a further main component in the pygidial gland secretion from the mass spectrum of its TMSi ether. The Laccophilinae occupy unique position among all the dytiscide subfamilies because they are the only water beetles which store yS-hydroxyalkanoic acids in their pygidial glands. On the other hand the dytiscides appear to form a monophyletic group which is supported by the occurrence of methyl 3,4-dihydroxyphenylacetate. This class of compound is also commonly encountered in the other dytiscide subfamilies. 
  Reference    Z. Naturforsch. 38b, 1678—1685 (1983); eingegangen am 7. Juli 1983 
  Published    1983 
  Keywords    Arthropode Defensive Compounds, ß-Hydroxyalkanoic Acids, Methyl 3, 4-dihydroxyphenylacetate, GC-MS, Chemical Ecology 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1678.pdf 
 Identifier    ZNB-1983-38b-1678 
 Volume    38