3种不同检测方法测定大豆水分含量的差异分析

目的对比国标法、整粒烘ASAE法和快速水分法3种不同水分检测方法测定大豆水分含量的结果差异。方法取自3种不同产地的大豆,包括巴西大豆、美国大豆和国产大豆,进行大豆整籽粒和粉碎后的水分测定实验来比较大豆水分含量差异。同时对2种谷物粉碎仪差异进行了比较。结果以进口巴西大豆为例,用国标法测定水分平均值为7.76%,其中谷物磨测量值为7.75%,万用粉碎仪测量值为7.78%;ASAE法测得水分值为10.39%,快速水分仪测定值为10.7%。国标法水分测量值低于用ASAE法和快速水分仪法,且不同的粉碎磨粉碎后的水分测量值无明显差异(P 0.05)。通过对比,ASAE法和快速水分法测定的大豆整籽粒水分含量比较接近真实值,而粉碎后测得的水分含量比真实值低。结果表明,国标法中将大豆粉碎后水分测量值低于用ASAE法和快速水分仪法整籽粒法水分测量值(P0.05),且不同的粉碎磨粉碎后的水分测量值无明显差异。结论结合实际现场测量的实验环境、实验周期和成本等因素考虑,推荐谷物快速水分法为最佳检测方法。

Difference analysis of the determination of moisture content in soybean by 3 kinds of different methods

Objective To compare the moisture content determination results of soybean by national standard method, ASAE method and rapid moisture method. Methods The moisture content difference of soybean was compared by moisture determination experiments of whole soybean seeds and crushed soybeans from 3 different producing areas, including Brazil soybean, United States soybean and domestic soybean. Results Taking Brazil soybean as an example, the average value of moisture was 7.76% by national standard method, including 7.75% by grain mill, 7.78% by universal pulverizer, 10.39% by ASAE and 10.7% by rapid moisture meter. The moisture content measured by the national standard method was lower than that by ASAE method and rapid moisture meter method, and there was no significant difference between the moisture content measured by different grinding methods (P > 0.05). By comparison, the moisture content of soybean whole grain measured by ASAE and rapid moisture method is close to the real value, but the moisture content measured after crushing is lower than the real value. The results showed that the water content measured by the national standard method was lower than that by ASAE method and rapid moisture meter method (P < 0.05), and there was no significant difference between the moisture content measured by different grinding methods. Conclusion Considering the factors of experiment environment, experiment period and cost, it is recommended that the rapid moisture method of grain is the best method.