摘要
探究氮气脱臭过程中,不同工艺条件对玉米脱色油中游离态和酯态植物甾醇(以下简称为两态)以及两态总甾醇含量变化的影响。在单因素试验的基础上,通过正交试验确定了最佳工艺条件。试验表明:温度对两态总甾醇保留率影响显著,时间和氮气通气速率对其影响不显著;温度、时间对游离态甾醇损失率影响显著,氮气通气速率对其影响不显著。影响因素的主次顺序为温度>时间>氮气通气速率。综合选取最优脱臭工艺条件:温度210℃,时间80 min,氮气通气速率0.08 m^3/h。对两态总甾醇保留率进行回归分析,得到回归方程为Y(%)=-0.28A-0.07B-22.71C+165.35。最佳工艺条件下两态总甾醇保留率为96.78%、游离态甾醇损失率为13.16%。
We explored the effects of different deodorization conditions on the content of free and esterified sterols （two-state sterols for short） as well as the total content of the two-state sterols in the bleached tom oil. On the basis of single factor experiments, the optimal deodorization conditions were detemrined by orthogonal experiment. The results showed that： temperature had significant effect on the retention rate of the two-state sterols, however time and nitrogen flow rate had non-significant effect; tempeature and time had significant effect on the loss rate of free sterols, but the nitrogen flow rate had non-signifanct effect. Test results showed that the primary influencing factor was temperature, followed by time and nitrogen flow rate, and the optimal deodorizaiton conditions were determined as follows： temperature 210 ℃, time 80 min, and nitrogen flow rate 0.08 m3/h. The regression equation of the retention rate of the two-state sterols was Y （ % ）=-0.28A -0.07B-22.71 C＋ 165.35. Under the optimal conditions, the percentage retention rate of the two-state sterols was 96.78%, and the loss rate of free sterols was 13.16%.
作者
郑淑敏
马传国
ZHENG Shumin MA Chuanguo(School of Food Science and Technology National Engineering Laboratory for Wheat ＆ Corn Further Processing, Henan University of Technology Zhengzhou 450001, China)
出处
《河南工业大学学报（自然科学版）》
CAS
北大核心
2017年第2期8-13,18,共7页
Journal of Henan University of Technology：Natural Science Edition
基金
河南工业大学高层次人才基金(2014BS018)
关键词
玉米油
氮气脱臭
游离态甾醇
酯态甾醇
酸值
保留率
游离态甾醇损失率
corn oil
nitrogen deodorization
free sterols
esterified sterols
acid value
retention rate
the loss rate of free sterols
