Effects of cooling rate and aging process on crystallographic structure, whipping, rheological, textural and thermal properties of frozen minarine

محورهای موضوعی : Food and Health

Leyla Alizadeh ¹ , Khadije Abdolmaleki ² , Kooshan Nayebzadeh ³

1 - Department of Food Quality Control and Hygiene, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 - Department of Food Science and Technology, School of Nutritional Sciences and Food Technology, Kermanshah University of Medical Sciences, Kermanshah, Iran
3 - Department of Food Technology, Faculty of Nutrition Sciences and Food Technology/National Nutrition and Food Technology Research Institute, Shahid Beheshti University of Medical Sciences, Tehran, Iran

تاریخ دریافت : 1398/11/16 تاریخ پذیرش : 1399/02/26 تاریخ انتشار : 1399/03/26

کلید واژه: Minarine, Whipping cream, Cooling rate, Aging process,

چکیده مقاله :

Minarine is a cream obtained by mixture of animal cream and vegetable oils. Fat crystallization is the main stage in the production of this product and affects its mouth-feel, stability, texture, and appearance. Processing conditions influencing the fat crystallization, partial coalescence, and finally physical and structural properties of whipped cream are heat treatment (pasteurization and sterilization), homogenization, cooling rate, aging process, tempering, and temperature, time and speed of whipping. The objective of this study is to characterize the effects of fast cooling by ice cream maker to 5 ºC and aging process at this temperature for 24 hours, on whipping, rheological, textural, crystallographic and thermal properties of frozen minarine. Results illustrated that the most desirable whipping properties (overrun=114.8% and syneresis=3.6mm) and the highest rheological and textural properties, γLVR (0.33), G' (40850 Pa), and firmness (642 g), were belonged to sample FCA due to the formation of the denser crystalline network resulting from fast cooling and aging process. Wide-angle X-ray scattering spectra shows that α -crystals were mainly formed upon fast cooling then, a transition from α to β'-crystals took place during aging process. Also, according to differential scanning calorimetric results, the endothermal peak temperature was shifted to higher temperatures due to fast cooling and aging processes.

چکیده انگلیسی:

Minarine is a cream obtained by mixture of animal cream and vegetable oils. Fat crystallization is the main stage in the production of this product and affects its mouth-feel, stability, texture, and appearance. Processing conditions influencing the fat crystallization, partial coalescence, and finally physical and structural properties of whipped cream are heat treatment (pasteurization and sterilization), homogenization, cooling rate, aging process, tempering, and temperature, time and speed of whipping. The objective of this study is to characterize the effects of fast cooling by ice cream maker to 5 ºC and aging process at this temperature for 24 hours, on whipping, rheological, textural, crystallographic and thermal properties of frozen minarine. Results illustrated that the most desirable whipping properties (overrun=114.8% and syneresis=3.6mm) and the highest rheological and textural properties, γLVR (0.33), G' (40850 Pa), and firmness (642 g), were belonged to sample FCA due to the formation of the denser crystalline network resulting from fast cooling and aging process. Wide-angle X-ray scattering spectra shows that α -crystals were mainly formed upon fast cooling then, a transition from α to β'-crystals took place during aging process. Also, according to differential scanning calorimetric results, the endothermal peak temperature was shifted to higher temperatures due to fast cooling and aging processes.

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