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1981 (1)
1979 (1)
1975 (1)
1Author    Martin Bopp, Werner LüdickeRequires cookie*
 Title    Über den Abbau des Sinapins während der frühen Ontogenese der Keimlinge von Sinapis alba L. Degradation of Sinapine during the Early Development of Sinapis alba L  
 Abstract    The amount of sinapine in immature seeds of Sinapis alba is very low; it increases during ripening. Most of the sinapine is located in the cotyledons. Hypocotyls and roots contain only traces of it. During the early development of seedlings the amount of sinapine in the cotyledons decreases in 26 °C very rapidly. Simultaneously the amount of a substance X increases. Darkness retarded both these processes. The same effect has a temperature of 10 °C. In both cases the increase of X is completly proportional to the decrease of sinapine. Therefore X is probably a derivative of sinapine. After pretreatment with 26 C amount of sinapic acid increases only in the at a very low level for a long period. 
  Reference    (Z. Naturforsch. 30c, 663 [1975]; eingegangen am 12. Mai 1975) 
  Published    1975 
  Keywords    Sinapis alba, Sinapine, Sinapic Acid, Seedling Development 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0663.pdf 
 Identifier    ZNC-1975-30c-0663 
 Volume    30 
2Author    Dieter StrackRequires cookie*
 Title    Sinapine as a Supply of Choline for the Biosynthesis of Phosphatidylcholine in Raphanus sativus Seedlings  
 Abstract    Biosynthesis o f phosphatidylcholine in young seedlings o f Raphanus sativus is supplied with choline from degradation of the seed constituent sinapine (sinapoylcholine). This conclusion has been deduced from the following results: (1) Raphanus sativus seedlings accumulate approx. 70 nmol phosphatidylcholine which may be relevant for the consumption of choline, liberated during hydrolysis of approx. 130 nmol sinapine. (2) [14C]choline and [14C]ethanolamine, taken up by germinating Raphanus seeds, are exclu­ sively consumed in the biosynthesis o f phosphatidylcholine and phosphatidylethanolamine, respectively. (3) Pulse-chase experiments with seedlings at different germination stages show a reduced [14C]choline incorporation into phosphatidylcholine at the time when degradation o f sinapine occurs, obviously as a result of an isotope dilution by an increase o f the endogenous choline pool. (4) After [14C]choline pulse to immature seeds, during the process o f seed maturation most of the activity taken up is incorporated into accumulating sinapine and approx. 50% compared to this into phosphatidylcholine. During seedling development the quantity o f labelled sinapine rapidly decreases as a result of sinapine degradation with a concomitant label increase in free choline, phosphorylcholine, and phosphatidylcholine. Approx. 50% of the choline liberated from sinapine, is consumed in the biosynthesis of phosphatidylcholine. High performance liquid chromatographic analyses of phosphatidylcholine during Raphanus germination revealed that this phospholipid might be a metabolically active compound. Changes in the absorptivity of this compound at 210 nm indicate changes in the degree of unsaturation in the fatty acyl groups. 
  Reference    Z. Naturforsch. 36c, 215—221 (1981); received December 231980 
  Published    1981 
  Keywords    Sinapine, Phosphatidylcholine, Phenylpropanoids, Phospholipids, Raphanus, Brassicaceae 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0215.pdf 
 Identifier    ZNC-1981-36c-0215 
 Volume    36 
3Author    G. Erhild, N. Urm, Ann, D. Ieter StrackRequires cookie*
 Title    Sinapine Esterase I. Characterization of Sinapine Esterase from Cotyledons of Raphanus sativus  
 Abstract    From cotyledons o f Raphanus sativus (red radish) an esterase activity which catalyzes the hy­ drolysis o f sinapine into sinapic acid and choline has been isolated. The enzyme, which has a near absolute specificity, is not analogous with any esterase described in the literature. The reaction has a pH optim um o f 8.5 and the apparent K m is 1.95 x 10~5 m. The enzyme is relatively insensi­ tive to both physostigm ine (eserine) {K x = 1.73 x 10-4 m) and neostigm ine (A'i = 2 .1 3 x 10-4 m). Diisopropyl fluorophosphate (D F P) showed no inhibition and diethyl /?-nitrophenylphosphate (E 600) only a slight inhibitory effect at 10-5 m, respectively. Choline (10~2 m) was inhibitory but acetylcholine (1 0 -2 m) stimulated the enzyme activity. 
  Reference    Z. Naturforsch. 34c, 715—720 (1979); received June 11 1979 
  Published    1979 
  Keywords    Esterase, Sinapine, Sinapic Acid Esters, Raphanus, Brassicaceae, High-Performance Liquid Chro­ matography (HPLC) 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0715.pdf 
 Identifier    ZNC-1979-34c-0715 
 Volume    34