کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7790807 | 1500644 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Rheological behaviors of an exopolysaccharide from fermentation medium of a Cordyceps sinensis fungus (Cs-HK1)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Rheological behaviors of an exopolysaccharide from fermentation medium of a Cordyceps sinensis fungus (Cs-HK1) Rheological behaviors of an exopolysaccharide from fermentation medium of a Cordyceps sinensis fungus (Cs-HK1)](/preview/png/7790807.png)
چکیده انگلیسی
The rheological behaviors of an exopolysaccharide (EPS) from a Cordyceps sinensis fungus fermentation were investigated. The intrinsic viscosity of 1986 ± 55 mL/g indicated an extended and rigid chain for EPS. Shear-thinning behavior was observed and became apparent with increasing concentration. According to cross model, two critical transition concentrations (c* and c**) from dilute solution to semidilute and then to concentrated domain were 0.45 and 6.14 mg/mL. Flow activation energy was calculated by Arrhenius equation and decreased with increasing concentration, indicating a lower sensitivity to temperature. From dynamic frequency sweep, EPS system was classified to three regions including dilution solution (1.25 mg/mL), entanglement network (3.75 and 5.00 mg/mL) and weak gel (â¥7.50 mg/mL). Notably, the increase in η* at high frequencies was attributed to a large flow resistance depended on the rigid chain of EPS. Based on Winter-Chambon criterion, EPS formed gel at 2.6 mg/mL (cgel) and showed typical weak gel from temperature ramp and repetitive strain sweep.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 114, 19 December 2014, Pages 506-513
Journal: Carbohydrate Polymers - Volume 114, 19 December 2014, Pages 506-513
نویسندگان
Fengyuan Sun, Qilin Huang, Jianyong Wu,