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作 者:曾庆梅[1] 殷允旭[1] 杨毅[1] 王海翔[1] 潘见[1] 胡斌[1] 徐迪[1]
机构地区:[1]合肥工业大学农产品生物化工教育部工程研究中心,安徽合肥230009
出 处:《食品科学》2007年第8期29-32,共4页Food Science
基 金:国家自然科学基金项目(30571304);农产品生物化工教育部工程研究中心开放基金项目(KF2004005);安徽省教育厅重点科研项目(2004kj004zd)
摘 要:目的:研究超高压处理对辣根过氧化物酶活力的影响。方法:实验压力为0.1~500MPa,温度为20~60℃,保压时间为5~30min,酶溶液pH7.0。结果:①在常压常温条件下,在酶溶液为pH7.0时酶活力最大,为其最适酸碱度。②在处理温度为40℃、保压时间为10min和酶溶液pH7.0的条件下,压力对酶活力有显著影响;在100MPa附近的低压处理时,酶活力会反常升高;大于400MPa处理时,酶活力下降趋势缓慢。③在处理压力为500MPa、保压时间为10min、酶溶液pH7.0条件下,在40℃以下的温度范围内,酶的活力下降趋势缓慢;40℃以后,酶活力随温度升高下降迅速。④在500MPa、40℃、pH值为7.0的条件下,保压25min辣根过氧化物酶的残留活力接近最低水平,进一步延长保压时间对酶的活力影响甚微;保压时间不是影响酶活力的主要因素。结论:超高压处理对辣根过氧化物酶活力影响显著;压力、温度和保压时间对酶活力均产生较大影响。Objective: The effects of high pressure(HP) treatment parameters on horseradish peroxidase(HRP) activity was studied. Method: The experiments was carried out under the high hydrostatic pressure (0.1-500 MPa), temperature (20-60℃), dwell time (2-34 min) and pH7.0 of the enzymatic solution. Result: ① The pH7.0 of the enzymatic solution is optimal acidity, and HRP activity value is highest at environmental pressure(0.1MPa) and ambient temperature(20℃) ② The effect of compression is significant on HRP activity under the treatment tem- perature 40℃, dwell time 10min and pH7.0; HRP activity increases abnormally in treatment of about 100MPa, and decreases slowly above 400 MPa. ③HRP activity decreases slowly under temperature of less than 40℃ at the pressure of 500MPa and dwell time of 10min pH7.0; Decreases rapidly with increase of temperature above 40℃. ④HRP activity arrives at the least level after compression of 25 min, increases little with prolonging further time; Dwell time is not main factor affecting HRP activity in HP treatment. Conclusion: HP treatment remarkably influ- ences HRP activity. The pressure, temperature and dwell time is remarkable factors in HP treatment on HRP.
分 类 号:TS255.1[轻工技术与工程—农产品加工及贮藏工程]
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