کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7600930 | 1492148 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural characteristics and antioxidant activities of different families of 4-acetamido-TEMPO-oxidised curdlan
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structural characteristics and antioxidant activities of different families of 4-acetamido-TEMPO-oxidised curdlan Structural characteristics and antioxidant activities of different families of 4-acetamido-TEMPO-oxidised curdlan](/preview/png/7600930.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Chemistry - Volume 143, 15 January 2014, Pages 530-535
Journal: Food Chemistry - Volume 143, 15 January 2014, Pages 530-535
نویسندگان
Jing-Kun Yan, Hai-Le Ma, Pan-Fu Cai, He-Nan Zhang, Qi Zhang, Nan-Zi Hu, Xiao-Bo Feng, Jian-Yong Wu,