Study on Nitrogen Forms in Phenolic Polymers Incorporating Protein by  ̄(15)N CP-MAS NMREnglish Full Text
CHENG LILI and WEN QIXIAO(Institute of Soil Science,Academia Sinica,P.O.Box 821,Nanjing 210008 China)
Abstract: Phenolic polymers synthesized by reactions of p-benzoquinone with 15N-labelled protein or(15NH4)2SO4 were studied by using 15N CP-MAS NMR technique in combination with chemical approaches.Results showed that more than 80% of nitrogen in quinone-protein polymers was in the form of amide with some present as aromatic and/or aliphatic alone and less than 10% of nitrogen occurred as heterocyclic N.The nitrogen distribution in the non-hydrolyzable residue of the quinone-protein polymers was basically similar to that of soil humic acid reported in literature with the exception that a higher proportion of N as heterocyclic N and aromatic amine and a lower proportion of N as amide and aliphatic amine were found in the former than in the latter. More than 70% of total nitrogen in quinones(NH4)2SO4 polymer was acid resist ant,of which about 53% occurred as pyrrole,nitrile and imino type N.The possible roles of the reactions of phenols or quinones with proteins in the formation of humic acid,especially the non-hydrolyzable nitrogen in humic acid,are discussed.
Keywords:
- Series:
(D) Agriculture
- Subject:
Fundamental Science of Agriculture; Agronomy
- Classification Code:
S153
- Mobile Reading
Read on your phone instantly
Step 1Scan QR Codes
"Mobile CNKI-CNKI Express" App
Step 2Open“CNKI Express”
and click the scan icon in the upper left corner of the homepage.
Step 3Scan QR Codes
Read this article on your phone.
- CAJ Download
- PDF Download
Download the mobile appuse the app to scan this coderead the article.
Tips: Please download CAJViewer to view CAJ format full text.
Download: 21 Pagecount: 10 Size: 318k
Citation Network
Related Literature
- Similar Article
- Reader Recommendation
- Associated Author