IJE TRANSACTIONS C: Aspects Vol. 29, No. 12 (December 2016) 1670-1676    Article in Press

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S. A. Shahidi, A. Ghorbani-HasanSaraei, M. Mohebbi and A. Motamedzadegan
( Received: March 22, 2016 – Accepted in Revised Form: September 30, 2016 )

Abstract    The effect of frying pressure on the kinetics of color changes during atmospheric and vacuum deep fat frying of Reshteh Khoshkar has been studied. The Hunter color parameters redness, yellowness, lightness and total color difference were used to estimate color changes during frying as a function of process. Lightness (L*) decreased from 85.37 to 75.01 with vacuum frying time, while redness (a*), yellowness (b*) and total color difference increased from -2.09, 4.92 and 0 to 1.22, 37.01 and 31.56, respectively. It was observed that the severity of colour change was higher in atmospheric frying process than the vacuum frying process. The changes in color parameters were modeled by zero-order, first-order and a combined kinetics model. The two first-order and combined kinetics models fitted properly the values of color changes during frying, with good coefficient of determination. The combined model used can describe the experimental colour parameters better than the other studied kinetics models.


Keywords    Vacuum frying; Color; Kinetics


چکیده    در این پژوهش اثر فشار سرخ کردن بر تغییرات رنگ رشته خوشکار طی سرخ کردن عمیق بررسی شد. پارامترهای رنگی هانتر شامل زردی، قرمزی، روشنایی و تغییرات کلی رنگ برای تخمین تغییرات رنگ طی سرخ کردن به‌عنوان تابعی از فرایند مورداستفاده قرار گرفتند. پارامتر روشنایی با گذشت زمان سرخ کردن طی خلأ از 37/85 به 01/75 کاهش یافت درحالی‌که پارامترهای زردی، قرمزی و تغییرات کلی رنگ به ترتیب از 09/2، 92/4 و 0 به 22/1، 01/37 و 56/31 افزایش یافتند. مشاهده شد که شدت تغییرات رنگ در فرایند سرخ کردن تحت شرایط اتمسفری بیشتر از شرایط تحت خلأ بود. مدل‌های درجه صفر، درجه اول و مدل مرکب برای بررسی تغییرات رنگ به کار رفتند. نتایج نشان دادند که تغییرات زردی، قرمزی، روشنایی و تغییرات کلی رنگ با هر دو مدل درجه اول و مدل مرکب قابل‌بیان هستند. مدل مرکب فراسنجه های رنگ مورد آزمون را بهتر از سایر مدل‌های سینتیکی موردبررسی تشریح کرد.


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