期刊
JOURNAL OF FOOD ENGINEERING
卷 262, 期 -, 页码 13-21出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jfoodeng.2019.05.014
关键词
Ice crystals; X-ray micro-computed tomography; mu CT; Minced beef; Cryogenic freezing; Mechanical freezing
资金
- CIFRE department (Conventions Industrielles de Formation par la Recherche) from the French ANRT (Association Nationale de la Recherche et de la Technologie)
The freezing rate determines the ice crystal size distribution and morphology. Ice crystal characteristics may have a direct impact on the microstructure of food products, providing irreversible cell and tissue damages resulting in quality losses. In this paper, an innovative method was used for imaging and quantifying ice crystals directly in frozen samples of minced beef by X-ray micro-computed tomography. The results were compared to those obtained by X-ray micro-computed tomography on freeze-dried samples. The effects of the integral cooling rate on ice crystal characteristics were studied for various mechanical and cryogenic freezing operating conditions. It was pointed out that crystals become 2.5 times smaller when the freezing temperature goes down from -30 degrees C to - 100 degrees C. These crystals are also more numerous with a narrower distribution. Fluorescence optical microscopy and electron scanning microscopy were also used to do qualitative analysis. These results confirmed the effect of the freezing temperature on ice crystal sizes.
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