五种饲料原料水活性等温吸附曲线研究

Research on Water Activity Adsorption Isotherms for Five Feedstuffs

通过研究5种常用饲料原料(玉米、豆粕、菜粕、鱼粉和麸皮)的水活性等温吸附曲线,评价了5种常用的数学模型对这几种饲料原料水活性等温吸附曲线的拟合效果,发现玉米的水活性等温吸附曲线效果:Chungpfost方程在(25±1)℃和(17±1)℃时拟合最好,直线方程在(11±1)℃条件下拟合效果最好;豆粕的水活性等温吸附曲线:Henderson方程在(25±1)℃和(17±1)℃时拟合效果最好,直线方程在(11±1)℃条件下拟合效果最好;菜粕的水活性等温吸附曲线:Henderson方程拟合各个试验温度条件下的效果均最好;鱼粉的水活性等温吸附曲线:在(25±1)℃条件下Halsey方程拟合效果最好,Chungpfost方程在(17±1)℃条件下拟合效果最好,而Henderson方程在(11±1)℃条件下拟合效果最好;麸皮的水活性等温吸附曲线:Halsey方程在(25±1)℃条件下拟合的效果最好,Chungpfost方程在(17±1)℃、(11±1)℃条件下拟合效果最好。并选择拟合最好的数学模型计算出各种饲料原料的绝对安全水分含量和相对安全水分含量,以期为饲料储存和饲料生产做出指导。

The water activity adsorption isotherms for corn, soybean meal, rapeseed meal, fish meal, and wheat bran were researched, and the adaptation of five mathematics models for fitting the adsorption isotherms of every kind of these materials was evaluated. The following are results： For fitting the adsorption isotherms of corn, Chungfost model is most adaptable at temperature （25 ± 1 ）℃ and （17 ± 1 ）℃, and at （11 ± 1 ）℃ is the line model. For that of soybean meal, Henderson model is most adaptable at temperature （25 ± 1 ）℃ and （17 ± 1 ）℃, and the line model is at （11 ± 1 ） ℃. For rapeseed meal, Henderson model is most adaotable for fitting its adsorotion isotherms at every temperature in this experiment. For fitting the adsorption isotherms of fish meal, Halsey model is most adaptable at temperature （25 ± 1 ） ℃, at （ 17 ± 1 ） ℃ is Chungpfost model, and at （ 11 ± 1 ） ℃ is Henderson model. Finally, for wheat bran, at temperature （25 ± 1 ） ℃ Halsey model is most adaptable for fitting its adsorption isotherms, at （ 17 ± 1 ） ℃ and （ 11 ± 1 ） ℃ is Chungpfost model. According to every most adaptable mathematics model, the absolute safe storage moisture and relatively safe storage moisture for various feedstuffs were calculated, which would be an instruction for feed storage and manufacture.