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：

humic acid; ￣（15）N NMR; phenolic polymer;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

Mobile Reading

Read on your phone instantly

Step 1
Scan QR Codes

"Mobile CNKI-CNKI Express" App

Step 2
Open“CNKI Express”

and click the scan icon in the upper left corner of the homepage.

Step 3
Scan QR Codes

Read this article on your phone.
CAJ Download
PDF Download

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)

Read on your phone instantly

Citation Network

Related Literature