کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9487447 | 1330751 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Rheological properties of selected gum solutions
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش تغذیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Gums are integral ingredients in fluid foods used for controlling viscosity and mouthfeel. Advances in rheological instrumentations permits enhanced evaluations of the viscoelastic properties of fluids. Rheological properties of twelve gum solutions were investigated at concentrations of 0.05%, 0.1%, and 0.5%. The viscous (ηâ³) and elastic (ηâ³) components of the complex viscosity ηâ, elastic yield stress, and tan δ were measured as functions of oscillatory shear. Konjac exhibited the highest ηⲠand ηⳠcomponents among all gums at 0.5% and 50 sâ1. Gum Arabic, methylcellulose and pectin, exhibited the least ηⲠand no ηⳠcomponent under the same conditions. Konjac exhibited greatest elastic yield stress, whereas microcrystallinecellulose had the least. Modeling results showed that rheological properties of CMC were characterized by an exponential relationship, whereas riota-carrageenan and xanthan were described by a power type relationship. A substantial increase in tan δ was observed for most 0.5% gums solutions at shear rates beyond 10 sâ1, indicating a shift from a visco-elastic regime to a purely viscous one. For gums that showed substantial visco-elasticity, peak tan δ values ranged from 5.7 to 68.3.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Research International - Volume 38, Issue 2, March 2005, Pages 111-119
Journal: Food Research International - Volume 38, Issue 2, March 2005, Pages 111-119
نویسندگان
E.I. Yaseen, T.J. Herald, F.M. Aramouni, S. Alavi,