ارزیابی و مدل‌سازی خواص رئولوژیکی محلول صمغ گزانتان تیمار شده با مایکروویو

نویسندگان
1 دانشیار، گروه علوم و مهندسی صنایع غذایی، دانشگاه بوعلی سینا، همدان
2 دانشجوی کارشناسی ارشد، گروه علوم و مهندسی صنایع غذایی، دانشگاه بوعلی سینا، همدان
چکیده
محلول آبی صمغ گزانتان دارای ویسکوزیته بالا و رفتار سودوپلاستیک است. این تحقیق با هدف تجزیه و تحلیل اثر پیش‌تیمار مایکروویو در فواصل زمانی مختلف (0، 1، 2 و 3 دقیقه) بر ویسکوزیته و رفتار رئولوژیکی محلول صمغ زانتان انجام شد. نتایج نشان داد که ویسکوزیته ظاهری محلول صمغ گزانتان (محلول تیمار نشده) با افزایش سرعت برشی از 2/12 برثانیه به 2/171 برثانیه، از 177/0 پاسکال ثانیه به 036/0 پاسکال ثانیه کاهش یافت. همچنین، ویسکوزیته ظاهری محلول صمغ گزانتان با افزایش زمان پیش‌تیمار مایکروویو از 0 به 3 دقیقه، از 070/0 پاسکال ثانیه به 046/0 پاسکال ثانیه، کاهش یافت (سرعت برشی = 2/61 برثانیه). رفتار جریان همه نمونه‌ها با موفقیت با مدل‌های قانون توان، بینگهام، هرشل بالکلی و کاسون مدل‌سازی شد و مدل هرشل بالکلی به‌عنوان مدل بهتر برای توصیف رفتار جریان محلول‌های صمغ گزانتان انتخاب شد. مدل هرشل بالکلی با حداکثر ضریب تبیین (r) (بیشتر از 9032/0) و حداقل مجموع مربعات خطا (SSE) (کمتر از 7165/0) و جذر میانگین مربعات خطا (RMSE) (کمتر از 2552/0) عملکرد قابل قبولی داشت. تنش تسلیم و ضریب قوام محلول صمغ گزانتان (مدل هرشل بالکلی) با افزایش زمان پیش‌تیمار مایکروویو از 0 به 3 دقیقه به ترتیب از 095/0 پاسکال به 450/0 پاسکال و از Pa.sn 659/0 به Pa.sn 811/0 افزایش یافت. شاخص رفتار جریان محلول‌های صمغ گزانتان (مدل هرشل بالکلی) با افزایش مدت تیماردهی با مایکروویو، از 440/0 به 328/0 کاهش یافت.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Evaluation and modelling of rheological properties of microwave treated xanthan gum solution

نویسندگان English

Fakhreddin Salehi 1
Maryam Tashakori 2
Kimia Samary 2
1 Associate Professor, Department of Food Science and Technology, Bu-Ali Sina University, Hamedan, Iran
2 MSc Student, Department of Food Science and Technology, Bu-Ali Sina University, Hamedan, Iran
چکیده English

The aqueous solution of xanthan gum has high viscosity and pseudoplastic behavior. This research aimed to analyze the effect of microwave pretreatment at different time intervals (0, 1, 2, and 3 min) on the viscosity and rheological behavior of xanthan gum solution. The results showed that the apparent viscosity of xanthan gum solution (untreated solution) reduced from 0.177 Pa.s to 0.036 Pa.s with increasing shear-rate from 12.2 s-1 to 171.2 s-1. Also, the apparent viscosity of xanthan gum solution reduced from 0.070 Pa.s to 0.046 Pa.s with increasing the microwave pretreatment time from 0 to 3 min (shear-rate=61.2 s-1). The flow behavior of all samples was successfully modeled with Power law, Bingham, Herschel-Bulkley, and Casson models, and the Herschel-Bulkley model was selected as the better model to describe the flow behavior of xanthan gum solutions. The Herschel-Bulkley model had an acceptable performance with the maximum correlation coefficient (r) (higher than 0.9032) and the minimum sum of squared error (SSE) (lower than 0.7165) and root mean square error (RMSE) (lower than 0.2552). The yield stress and consistency coefficient (Herschel-Bulkley model) of xanthan gum solution increased from 0.095 Pa to 0.450 Pa, and from 0.659 Pa.sn to 0.811 Pa.sn, with increasing microwave pretreatment time from 0 to 3 min, respectively. The flow behavior index (Herschel-Bulkley model) of xanthan gum solutions decreased from 0.440 to 0.328 while the duration of microwave treatment increased.

کلیدواژه‌ها English

Consistency coefficient
Herschel-Bulkley
Microwave
xanthan gum
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