Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26156
Title: Structural characteristics and antioxidant activities of different families of 4-acetamido-TEMPO-oxidised curdlan
Authors: Yan, JK
Ma, HL
Cai, PF
Zhang, HN
Zhang, Q
Hu, NZ
Feng, XB
Wu, JY 
Keywords: 4-Acetamido-TEMPO
Antioxidation
Chain conformation
Curdlan
Oxidation
Issue Date: 2014
Publisher: Elsevier
Source: Food chemistry, 2014, v. 143, p. 530-535 How to cite?
Journal: Food chemistry 
Abstract: Regioselective oxidation was applied to commercial curdlan for the preparation of its water-soluble derivatives with improved antioxidant activities, using a 4-acetamido-2, 2, 6, 6-tetramethylpiperidine-1-oxyl radical/NaClO/NaClO2 system at pH 4.8 and 40 °C. The structural features, molecular properties, and chain conformations of the oxidised curdlans were determined using Fourier transform (FT) infrared and FT Raman spectroscopy, carbon nuclear magnetic resonance, X-ray diffraction, and size-exclusion chromatography with multi-angle laser-light scattering analyses. The C6 primary hydroxyls of curdlan were successfully oxidised into carboxylate groups with less depolymerization, and no aldehyde groups were formed during oxidation. The crystalline region of curdlan was destroyed after oxidation. The oxidised curdlans formed random coils in aqueous solution, and the chain became more flexible and expanded with increasing carboxylate contents from 2.07 mmol/g to 4.87 mmol/g. The high polyglucuronic acid derivative (Cur-24) showed the best antioxidant activity in TEAC and FRAP assays, thus it could be explored as novel potential antioxidants for dietary and therapeutic applications.
URI: http://hdl.handle.net/10397/26156
ISSN: 0308-8146
DOI: 10.1016/j.foodchem.2013.07.129
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