Studies on the formation of lysinomethylalanine and histidinomethylalanine in milk products

  title={Studies on the formation of lysinomethylalanine and histidinomethylalanine in milk products},
  author={Axel W. Walter and Thomas Henle and Rainer Haessner and Henning Klostermeyer},
  journal={Zeitschrift f{\"u}r Lebensmittel-Untersuchung und Forschung},
ZusammenfassungAus Reaktionsansätzen bestehend ausN-Acetyldehydroaminobuttersäurenthylester undNα-Acetyl-l-lysin beziehungsweiseNα-Acetyl-l-histidin konnten die Crosslink-AminosäurenNε-(2-Amino-2-carboxy-1-methyl-ethyl)-l-lysin (Lysinomethylalanin, LMeAL) undNτ-(2′ amino-2-carboxy-2′ -methyl-ethyl)-l-histidin (Histidinomethylalanin, HMeAL) durch präparative Ionenaustauschchromatographie isoliert und anschließend durch 1H-und13C-NMR identifiziert werden. Das Aminosäurechromatogramm zeigte eine… 
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The trivial name lysinoalanine was chosen for this compound, which is probably formed by the addition of an amino group of a lysyl residue at the double bond of a dehydroalanyl residue formed after alkaline decomposition of disulphide bonds.
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Carbodiimide wie Diisopropylcarbodiimid (I) reagieren mit Alkoholen (II) zu den Isoharnstoffethern (III), die mit den geschutzten Serinderivaten (IV) verestert und dann mit weiterem Carbodiimid zu
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Mise en evidence d'un mecanisme de piegeage des acides amines essentiels (threonine, lysine et methionine) par reactions au sein des proteines : la threonine entraine une augmentation de la formation
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Summary The dephosphorylation of β-casein, type A1, by dilute aqueous solutions of sodium hydroxide has been studied. It has been found that the mechanism whereby inorganic phosphate is liberated by