棉籽加工生产线中低温棉籽蛋白棉酚含量的影响因素

Factors affecting gossypol content in low temperature cottonseed protein in cottonseed processing line

为降低棉籽蛋白中的棉酚含量,结合生产实际,研究了棉籽加工生产线中低温棉籽蛋白棉酚含量的影响因素,对低温棉籽蛋白的加工工艺进行了优化。结果表明,生产低温棉籽蛋白的最佳工艺条件为:预处理工段入浸棉坯粉末度10%左右,入浸棉坯水分4%左右;浸出工段新鲜溶剂甲醇体积分数92%~93%,甲醇循环液甲醇体积分数78%~80%(第1梯度)、65%~68%(第2梯度),料液比(物料质量与新鲜甲醇体积比)1∶0.5~1∶0.6,甲醇循环液温度50~53℃,浸出器不低于二段梯度逆流萃取;烘干工段应尽可能延长烘干工序时间,采取多道多台低温烘干设备,梯度连续烘干物料。在最佳工艺条件下,低温棉籽蛋白中棉酚含量降低至400 mg/kg以下。

In order to reduce the gossypol content in cottonseed protein,combined with production practice,the factors affecting gossypol content in low temperature cottonseed protein in cottonseed processing line were studied and the process of producing low temperature cottonseed protein was optimized.The results showed that the optimal process conditions were obtained as follows:powder degree of cottonseed flake about 10%and moisture content of cottonseed flake about 4%in the pretreatment section;volume fraction of methanol in fresh solvent 92%-93%,volume fraction of methanol in methanol circulating liquid in the first gradient 78%-80%,and 65%-68%in the second gradient,ratio of material mass to fresh methanol volume 1∶0.5-1∶0.6,methanol circulating liquid temperature 50-53℃and not lower than two-stage gradient countercurrent extraction in the leaching section;as far as possible to extend the drying process time,taking many low temperature drying equipment and gradient continuous drying materials in the drying section.Under the optimal conditions,the gossypol content in low temperature cottonseed protein decreased to less than 400 mg/kg.