Molecular changes in particulate organic matter (POM) in a typical Chinese paddy soil under different long-term fertilizer treatments was written by Zhou, P.;Pan, G. X.;Spacclni, R.;Piccolo, A.. And the article was included in European Journal of Soil Science in 2010.SDS of cas: 28020-37-3 This article mentions the following:
A combination of solid-state CPMAS-13C-NMR and TMAH thermochemolysis-GC/MS was applied to investigate the mol. composition of particulate organic matter (POM) separated from a Chinese paddy soil, from the Tai Lake region, under a long-term field experiment with different fertilizer treatments. The treatments were: (i) no fertilizer application (NF), (ii) chem. fertilizers only (CF), (iii) chem. fertilizer plus pig manure (CFM) and (iv) chem. fertilizer plus crop straw (CFS). CPMAS-13C-NMR spectra showed that POM from all treated plots was rich in O-alkyl-C compounds, followed by alkyl-C and aromatic-C compounds However, as compared with a control (NF), POM under CFM and CFS treatments exhibited a smaller relative O-alkyl-C content and a larger contribution of aromatic-C and alkyl-C, thus increasing both aromaticity and hydrophobicity and, hence, recalcitrance of POM samples. Thermochemolysis of POM from all treatments demonstrated a dominance of aliphatic and lignin-derived compounds However, the distribution of lignin monomers (p-hydroxyphenyl, P, guaiacyl, G, and syringyl, S) revealed significant differences among the treatments. The relative distribution of lignin P, G and S monomers in NF, CF and CFS indicated a preferential contribution of annual crops and maize straw, as compared with that found for CFM. Concomitantly, a larger content of aliphatic thermochemolysis derivatives was found for CFS and CFM. The relative increase of aliphatic mols. in CFS was attributed to hydrophobic polyesters from higher plants. In the CF and CFM systems, the presence of aliphatic components of microbial origin suggested a greater microbial activity in comparison with NF and CFS. The combined application of solid state CPMAS-13C-NMR and TMAH thermochemolysis-GC/MS can be used to assess effectively the accumulation of recalcitrant organic compounds in soil POM under long-term fertilizer application with organic biomass. It is thus inferred that soil organic matter stabilization by mol. recalcitrance contributes to carbon sequestration in Chinese paddy soils under long-term managements. In the experiment, the researchers used many compounds, for example, 3-Amino-2,6-dimethoxypyridine (cas: 28020-37-3SDS of cas: 28020-37-3).
3-Amino-2,6-dimethoxypyridine (cas: 28020-37-3) belongs to pyridine derivatives. Pyridine has a conjugated system of six 锜?electrons that are delocalized over the ring. The molecule is planar and, thus, follows the H鐪塩kel criteria for aromatic systems. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. SDS of cas: 28020-37-3