Abstract
Total nitrogen, total sulphur and S-methyl-L-cysteine content of seed meals ofPhaseolus vulgaris, Vigna aureus, Vigna unguiculata, Phaseolus lunatus, Pisum sativum, Cajanus cajan, Vicia faba major,Vicia faba minor,Glycine max, Lupinus albus andSphenostylis stenocarpa, have been determined. The nutritional significance of the presence of S-methyl-L-cysteine is discussed, together with the role that this amino acid may play in interfering with the determination of methionine by cleavage with cyanogen bromide and subsequent gas-chromatographic identification of methyl thiocyanate.
Zusammenfassung
Der Gesamtstickstoff-, der Gesamtschwefel- und der S-methyl-L-cysteingehalt des Samenmehls vonPhaseolus vulgaris, Vigna aureus, Vigna unguiculata, Phaseolus lunatus, Pisum sativum, Cajanus cajan, Vicia faba major,Vicia faba minor,Glycine max, Lupinus albus andSphenostylis stenocarpa wurde bestimmt. Die Nahrungswertbedeutung der Anwesenheit von S-methyl-L-cystein wird diskutiert; gleichzeitig wird die störende Rolle, die diese Aminosäure bei der Bestimmung von Methionin durch Spaltung mit Cyanogen und anschliessender gaschromatographischer Bestimmung von Methyl-thiocyanat ausüben mag, besprochen.
Résumé
Le contenu total de nitrogène, de sulphure et de S-méthyl-L-cysteine dans les farines de grainesPhaseolus vulgaris, Vigna aureus, Vigna unguiculata, Phaseolus lunatus, Pisum sativum, Cajanus cajan, Vicia faba major,Vicia faba minor,Glycine max, Lupinus albus andSphenostylis stenocarpa ont ete measures. Nous discutous l'importance nutritive du S-methyl-L-cysteine et le rôle que cet amino acide peut jouer dans la détermination par scission des proteines avec le cyanogène bromide suivi de l'identification du méthyl thiocyanate à l'aide du gas-chromatographique.
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Evans, I.M., Boulter, D. S-methyl-L-cysteine content of various legume meals. Plant Food Hum Nutr 24, 257–261 (1975). https://doi.org/10.1007/BF01092214
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DOI: https://doi.org/10.1007/BF01092214