中国食品学报2023，Vol.23Issue(11)：223-230,8.DOI:10.16429/j.1009-7848.2023.11.022
等离子电场辅助冷冻羊肉过程中冰晶变化及热力学分析
Ice Crystal Changes and Thermodynamic Analysis during Plasma Electric Field Assisted Freezing of Mutton
摘要
Abstract
In order to explore the effect of plasma electric field assisted freezing on the quality and freezing process of mutton,the longissimus dorsi muscles of sheep was selected as the experimental material,the effect of the auxiliary plasma electric field of different field strength(1,3 kV/m and 5 kV/m)on the freezing velocity of mutton and the distri-bution of ice crystal and the diameter and roundness of ice crystal in the frozen meat were studied,and the thermody-namic theory was used to analyze it.The results showed that the meat samples in the auxiliary 5 kV/m plasma field en-vironment had the shortest time to pass the maximum ice crystal generation zone at-20 ℃ and-35 ℃,70 min and 40 min,respectively,with significant differences compared with the control group(P＜0.05);the tissue sections showed the smallest ice crystal area and grain size formed at-35 ℃ assisted 5 kV/m plasma field freezing,and-20 ℃ assisted the roundness of ice crystals was the highest in 5 kV/m plasma field freezing,with a mean value of 0.88,and the above indexes were significantly different from the control group(P＜0.05).The entropy of the system was analyzed using Boltzmann's formula,and the results showed that the entropy of the meat samples frozen by the assisted 5 kV/m plasma electric field was the smallest at-20 ℃ and-35 ℃,with significant differences compared with the control group(P＜0.05).It proved that the auxiliary 5 kV/m plasma electric field could significantly improve the system frozen meat moisture vitrifi-cation degree,could make the crystallization process more controllable,the electric field assisted freezing required less energy to improve the subcooling degree,accelerate the freezing rate of meat samples,and the larger the field strength the more significant the effect.Based on the experimental results and energy-saving requirements,it was considered that-20 ℃ assisted 5 kV/m voltage freezing can be used as a new freezing method in production.关键词
等离子电场/羊肉/冰晶面积/冰晶粒径/热力学Key words
plasma electric field/mutton/ice crystal area/ice grain size/thermodynamics引用本文复制引用
乔丹丹,李斯琦,格日勒图,满都呼,吴金迪,莎日娜..等离子电场辅助冷冻羊肉过程中冰晶变化及热力学分析[J].中国食品学报,2023,23(11):223-230,8.基金项目
内蒙古自治区自然科学基金项目(2021MS03058) （2021MS03058）
财政部和农业农村部:国家现代农业产业技术体系资助项目(CARS38) （CARS38）
