Nitrogen Forms of Maillard Polymers Derived from Xylose and 15N-Labelled GlycineEnglish Full Text
CHENG LILI; WEN QIXIAO and CHEN BIYUN (Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008 China)
Abstract: Water-soluble, nondialyzable Maillard polymers were prepared by reacting D-xylose with 15N-glycine （and/or glycine） at 68 ℃ and pH 8.0 at equimolar concentrations of 1, 0.5 and 0.1 mol L-1, respectively,for 13 days and partitioned into acid-insoluble （MHA） and acid-soluble （MFA） fractions. The nitrogen forms in these polymers were studied by using the 15N cross polarization-magic angle spinning nuclear magnetic resonance （CPMAS NMR） technique in combination with chemical methods. The 15N nuclear magnetic resonance （NMR） data showed that while the yield, especially the MHA/MFA ratio, varied considerably with the concentrations of the reactants, the nitrogen distribution patterns of these polymers were quite similar.From 65% to 70% of nitrogen in them was in the secondary amide and/or indole form with 24%~25% present as aliphatic and/or aromatic ammes and 5% to 11% as pyrrole and/or pyrrole-like nitrogen. More than half （50%~77%） of the N in these polymers were nonhydrolyzable. The role of Maillard reaction in the formation of nonhydrolyzable nitrogen in soil organic matter is discussed.
Keywords：
Maillard polymer; nitrogen form; 15N cross polarisation-magic angle spinning nuclear magnetic resonance （CPMAS NMR）;
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture; Agronomy
- Classification Code：
S153
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