کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7790470 | 1500644 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural and thermal transitions during the conversion from native to granular cold-water swelling maize starch
ترجمه فارسی عنوان
انتقال ساختاری و حرارتی در هنگام تبدیل از نشاسته ذرت به تورم دانه ای بومی به دانه های سرد
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کلمات کلیدی
DSCTGAChlWAXDAMLAmylose - آمیلوزamylopectin - آمیلوپکتینThermal gravimetric analysis - تجزیه و تحلیل گرامشی گرمRoom temperature - دمای اتاقWavelength - طول موجdry matter - ماده خشکPolarized optical microscopy - میکروسکوپ نوری قطبی شدهStarch - نشاسته Wide angle X-ray diffraction - پراش اشعه X زاویه گستردهX-ray diffraction - پراش اشعه ایکسDifferential scanning calorimetry - کالریمتری روبشی افتراقی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
Native maize starch was gradually converted into granular cold-water swelling starch (GCWSS) by aqueous ethanol treatments at elevated temperatures. At a treatment temperature of 95 °C, decreasing ethanol concentrations from 68 to 48% (v/v) led to decreased post-treatment gelatinization enthalpies in excess water, reflecting remaining original A-type crystals. Concomitantly to native A-type crystal melting, VH-type crystals appeared. At an ethanol concentration of 48%, a granular cold-water swelling maize starch was successfully produced. All crystals in its intact granules were of the VH-type and appeared birefringent when studied in ethanol under polarized light. Removal of all residual solvent by high temperature drying did not influence swelling power, proving that a high temperature drying step is not necessary to induce cold-water swelling capacity. Based on in situ calorimetric measurements, the thermal requirements to produce GCWSS from different ethanol:water mixtures were elucidated. This work is the first to demonstrate that the amylose fraction contributes almost exclusively to VH-type crystal formation in GCWSS.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 114, 19 December 2014, Pages 196-205
Journal: Carbohydrate Polymers - Volume 114, 19 December 2014, Pages 196-205
نویسندگان
D.M. Dries, S.V. Gomand, B. Goderis, J.A. Delcour,