کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5512254 1540220 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Starch-based xerogels: Effect of acetylation on Physicochemical and rheological properties
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Starch-based xerogels: Effect of acetylation on Physicochemical and rheological properties
چکیده انگلیسی

This study was aimed at evaluating the physicochemical and rheological properties of starch-based xerogels. The starch from the shoots of Borassus aethiopium was physically modified by xerogelization, and chemically by acetylation, and combination of acetylation and xerogelization. The solubility, swelling and syneresis of the starches were determined by gravimetric techniques. Evaluation of the native starch and derivatives was done using microscopy, Fourier transform infra-red (FTIR), x-ray diffractometry (XRD), and 1H NMR spectroscopy. Rheological evaluation was done on 10%w/v dispersions using a Bohlin Gemini rheometer (fitted with a 55 mm and 2° cone and plate geometry with gap of 70). The diffractograms displayed three peaks, centered on 2θ = 15.3, 17.2 and 23.1° for the native and the starch acetate while the xerogel and the starch acetate xerogel were amorphous. The 1H NMR and FTIR confirmed the presence of acetyl groups at about 2.05 ppm and 1720 cm−1, respectively. Acetylation of the native starch resulted in improvement of solubility. The starch acetate-xerogel sample formed viscoelastic gels without the need for heating. Acetylation and/or xerogelization of the native starch inhibited syneresis. Starch acetate-xerogels, may find application as stabilizer or suspending agent in liquid food and pharmaceutical formulations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Biological Macromolecules - Volume 98, May 2017, Pages 94-102
نویسندگان
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