生石灰降低南极磷虾酶解液中氟含量的研究

Study on removal efficiency of fluoride from Antarctic krill hydrolyzate using quick lime

含氟量高是制约南极磷虾食品开发的一个重要因素,利用生石灰降低南极磷虾酶解液中的氟含量、成本低、效果好、无残留,可为南极磷虾商业化食品开发提供技术依据。吸附反应有多种类型,分析XRD图谱可知生石灰与南极磷虾酶解液中氟的吸附反应是离子反应。以降氟率为指标,生石灰添加量(X1)、初始pH(X2)、时间(X3)和温度为考察因素,对生石灰降低酶解液中氟含量进行了单因素实验和响应面优化实验,建立了二次响应面回归模型Y=84.49+4.29X1+2.77X2+0.18X3-0.93X1X2-1.09X2X3-2.11X21-0.55X2+0.81X32。在此基础上结合实际生产确定降氟最优条件为生石灰添加量0.009685g/mL,pH11.50,时间45min,温度(25±2)℃,此条件下降氟率达到88.25%±1.43%(p<0.05)。降氟后,水解液中TCA-NSI降低了2.55%,DH降低了7.85%,说明生石灰对酶解液营养影响较小。反应后体系通过0.40μm滤膜除去Ca(OH)2和CaF2,实现降氟材料的无残留。

High-fluorine was a significant factor to restrict the developing of Antarctic Krill in food industry.In this article,quick lime was used to reduce fluorine content in Antarctic Krill hydrolyzate,this method was low-cost,effective and non-residual,so it provided technical references for commercial application of Antarctic Krill as food.There were quantities of kinds of absorption reaction,the reaction between quick lime and fluoride from Antarctic krill hydrolyzate was proved to be ionic reaction by analyzing XRD patterns.With fluoride removal rate as index,evaluation of removal efficiency of fluoride from Antarctic krill hydrolyzate using quick lime was studied with single factor experiments and response surface optimization experiments,which included quick lime addition（X1）,initial pH（X2）,time（X3）and temperature.Simultaneously,secondary response surface regression model was established,which was Y=84.49＋4.29 X1＋2.77 X2＋0.18 X3-0.93 X1X2-1.09 X2X3-2.11 X21-0.55 X22＋0.81 X23,in which Y was fluoride removal rate.On this basis,combined with the practice,the optimal technology conditions were as follows：quick lime additive dosage 0.009685g/mL,pH 11.50,time 45min,temperature（25±2）℃,under this condition,fluoride removal rate was 88.25%±1.43%（p〈0.05）.After defluorination,TCA-NSI of hydrolyzate reduced by 2.55%,DH of hydrolyzate reduced by 7.85%,which proved that nutrition constituents in Antarctic krill hydrolyzate changed little.After defluorination reaction,all of quick lime changed into Ca（OH）2and CaF2,as sediment,they could be removed by 0.40μm filtration membrance,so the material of defluoridation was removed completely.