کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1385521 982448 2007 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Acid gelation of gellan: Effect of final pH and heat treatment conditions
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Acid gelation of gellan: Effect of final pH and heat treatment conditions
چکیده انگلیسی

The influence of polysaccharide concentration, final pH (2.0–4.0) and heat treatment temperature (70 or 90 °C/30 min) on the rheological properties, water-holding capacity (WHC), turbidity and microstructure of gellan gels formed by acidification with glucono-δ-lactone (GDL) was evaluated. In addition the gelation kinetics was monitored by oscillatory rheological measurements. Heating the solutions, raising the polymer concentration and lowering the final pH decreased the time taken to reach gel point. Failure stress increased at lower pH values, higher polysaccharide concentration and with the application of heating before acidification. However, gels heated after acidification showed decreased failure stress. All the gels were transparent and the WHC improved at higher concentrations and pH values or at lower pH values and gellan concentrations. The microstructure and turbidity showed good correlation with the mechanical properties, which could explain the influence of the process conditions on the gel properties.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 68, Issue 3, 5 April 2007, Pages 517–527
نویسندگان
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