欧姆加热过程对猪肉氧化和体外消化率华体会(中国)变化的研究
The dynamic changes of ohmic cooking on pork meat oxidation and digestion in vitro
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摘要: 本文研究了欧姆加热与水浴加热肉块到一定的终点温度(20100℃)时,脂肪和蛋白质氧化、蛋白质表面疏水活性和聚合度、胃蛋白酶、胰蛋白酶和α-凝乳蛋白酶体外消化率的华体会(中国)变化。结果显示:随着肉块终点温度的升高,蛋白质羰基呈现先下降后上升的趋势,而胰、α-凝乳蛋白酶体外消化率呈现一定的下降趋势。当肉块温度为40℃时,欧姆加热组的蛋白质表面疏水活性显著低于(p<0.05)水浴加热处理组。当肉块温度为20℃时,欧姆加热组的胰、α-凝乳蛋白酶消化率显著高于水溶加热处理组(p<0.05)。当肉块温度为60℃时,欧姆加热组的羰基值和胃蛋白酶体外消化率显著低于(p<0.05)水浴加热处理组,而胰、α-凝乳蛋白酶体外消化率显著高于(p<0.05)水浴加热处理组。当肉块温度为80℃时,欧姆加热组的硫代巴比妥酸值显著低于(p<0.05)水浴加热处理组。其余各指标各处理组无显著差异(p>0.05)。蛋白质聚合度、蛋白质疏水活度与胃蛋白酶体外消化率呈现显著负相关关系(p<0.05),因此欧姆加热肉品节约了总加热时间的1/25/6,氧化、体外消化率各指标与水浴加热处理组整体上无明显区别。Abstract: In order to investigate the effects of ohmic ( OH) and waterbath ( WB) cooking on lipid and protein oxidation, protein surface hydrophobicity, aggregation and the changes of pepsin, trpsin and α-chymotrypsin digestion rate in vitro of cooked meat samples at the same endpoint temperatures ( EPTs, range, 20~100 ℃) were evaluated.The results indicated that as the EPTs was increased, the values of protein carbonyl of cooked meat samples was decreased previously and then increased, whereas the values of trpsin and α-chymotrypsin in vitro was decreased. The OH-cooked samples had significant ( p < 0.05) lower protein surface hydrophobicity than that of the WB-cooked ones at 40 ℃.The OH-cooked samples had significant ( p < 0.05) higher trpsin and α-chymotrypsin digestion rate in vitro than WB-cooked ones at 20 ℃.The OH-cooked meat samples had significant ( p < 0.05) lower carbonyl, pepsin digestion rate in vitro and higher trpsin and α-chymotrypsin digestion rate in vitro than WBcooked ones at 60 ℃.The OH-cooked meat samples had significantly ( p < 0.05) lower TBARS values than WB-cooked ones at80 ℃, and no significant difference ( p > 0.05) was detected between OH and WB-cooked samples on other parameters. The significant negative correlation was observed in protein aggregation, surface hydrophobicity and pepsin digestion rate in vitro ( p < 0.05) . Therefore, the ohmic cooking could save 1/2~5/6 total cooking time, and there was no obvious difference in all detected parameters of oxidation and protein digestion in vitro between OH and WB-cooked samples.