制样设备参数对玉米脂肪酸值测定结果的影响  

Effect of Sample Preparation Equipment Parameters on Determination of Fatty Acid Value in Corn

作　　者：陈静珂 唐文强 毛根武 郭凤民 邱家志 唐涛 熊升伟 CHEN Jingke;TANG Wenqiang;MAO Genwu;GUO Fengmin;QIU Jiazhi;TANG Tao;XIONG Shengwei(College of Food Science and Engineering,Henan University of Technology,Zhengzhou 450001,China;Sinograin Chengdu Storage Research Institute Co.,Ltd.,Chengdu 610091,China)

机构地区：[1]河南工业大学粮油食品学院,河南郑州450001 [2]中储粮成都储藏研究院有限公司,四川成都610091

出　　处：《食品科技》2024年第3期300-306,共7页Food Science and Technology

基　　金：中储粮成都储藏研究院科技项目(202102)。

摘　　要：选择一种高纯度玉米作为测试样品,研究制样设备、筛片孔距、进料时间对脂肪酸值测定结果的影响。试验结果表明:(1)相同条件下,采用不同制样设备(1#机、2#机),对测试样品进行80 g定量连续10次重复性制样试验比对。1#机最高粉温为39.1℃,第3次制样的粉温达到33.1℃时,脂肪酸值开始显著上升,10次测定结果的变异系数为5.38%。2#机最高粉温30.6℃,脂肪酸值基本无变化,10次测定结果的变异系数为0.90%。(2)选择脂肪酸值测定结果变异系数小的2#机,筛选3种孔距筛片(1.25、1.5、1.75倍),设置4个不同进料时间(30、40、50、60 s),排列组合形成12组测试参数。每组测试参数进行80 g定量连续10次重复性制样试验比对。筛片孔距1.75倍时,脂肪酸值测定结果波动较大且绝对差值超过国标允许的2 mg KOH/100 g范围。从进料效率角度筛选,最佳筛片孔距为1.25倍。从筛片材质要求、使用寿命和加工难度角度筛选,最佳筛片孔距为1.50倍。从进料效率和变异系数角度筛选,最佳进料时间为30 s。A kind of high purity corn was selected as the test sample,and the effects of sample preparation equipment,sieve hole distance and feeding time on the determination results of fatty acid value were studied.The test results show that:(1)Under the same conditions,using different sample preparation equipment(1#machine,2#machine)for 80 g quantitative continuous sampling in ten successive trials.It was observed that the maximum powder temperature reached 39.1℃ with the 1#machine,and at the third sampling,the powder temperature reached 33.1℃,leading to a significant increase in fatty acid values with a variation coefficient of 5.38%over ten determinations.The highest powder temperature of the 2#machine was 30.6℃,and the coefficient of variation of fatty acid value was 0.90%over ten determinations.(2)Select the 2#machine with small coefficient of variation of fatty acid value,select three kinds of sieve hole distance(1.25,1.5,1.75 times)and set 4 different feeding times(30,40,50,60 s)to form 12 groups of test parameters.Each group of test parameters were compared by 80 g quantitative repeated test for 10 times.When the sieve hole distance was 1.75 times,the fatty acid value fluctuates greatly and the absolute difference exceeds the 2 mg KOH/100 g range allowed by the national standard.From the point of view of feed efficiency,the optimum sieve hole distance was 1.25 times.From the point of view of the material requirements,service life and processing difficulty of the sieve,the optimum hole distance of the sieve was 1.50 times.The optimum feeding time was 30 s from the point of view of feed efficiency and coefficient of variation.

关 键 词：玉米 脂肪酸值 制样设备 进料时间 筛片孔距 

分 类 号：TS210.4[轻工技术与工程—粮食、油脂及植物蛋白工程]