高压二氧化碳对苹果片榨汁特性的影响
首发时间:2010-01-15
摘要:研究了25 ℃时不同压强(10~30 MPa)处理20 min和10 MPa压强下不同处理时间 (10~50 min) 的高压二氧化碳(High Pressure Carbon Dioxide,HPCD)处理后苹果片的榨汁特性与果汁贮藏期间品质影响。结果表明:多酚氧化酶(PPO)在10 MPa处理20 min可完全钝化,而果胶甲基酯酶(PME)对HPCD具有较强的耐受性,酶活随着压强的升高而下降,30 MPa处理20 min后最小残余活性为41.21%;HPCD对苹果浊汁的颜色有较好保持作用,L值显著升高,a、b值降低;浊度随着压强升高或时间延长下降;4 ℃贮藏7天后,果汁褐变度无显著变化,而对照组完全褐变。
关键词: 苹果浊汁 苹果片 高压二氧化碳 多酚氧化酶 果胶甲酯酶
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Effects of High Pressure Carbon Dioxide
Abstract:Juicing characteristics of apple slices treated by high pressure carbon dioxide (HPCD) with 10~30 MPa for 20 min or 10 MPa for 10~50 min at 25 ℃ and storage stability of apple cloudy juice were studied. The results showed that PPO was completely inactivated at 10 MPa for 20 min; PME was more resistant to HPCD, its minimum residual activity was 41.21% at 30 MPa for 20 min. HPCD retained cloudy apple juice, the L value increased significantly while the a and b value decreased. The turbidity decreased with the pressure increasing and time prolonging. After 7-day storage at 4 ℃, the browning degree had no significant changes from the initial day, however, the control group was completely browning.
Keywords: apple slices cloudy apple juice high pressure carbon dioxide Polyphenol oxidase Pectin methylesterase
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