发酵鱼粉中酸价测定方法的研究

Study on the Detection Technique of Acid Value in Fermented Fish Meal

由于发酵鱼粉经提取后得到的油脂不仅酸价比鱼粉的高,而且颜色比鱼粉的深,故当采用《鱼粉GB/T19164-2003附录B》方法测定酸价时滴定终点难判断,而且滴定体积过大,造成误差。经过研究,把称重量从5g减少至2g,不仅滴定终点容易判断,而且滴定体积也比较适合,减少了误差。采用该方法测定发酵鱼粉中的酸价,回收率为95.1%～108.8%,相对标准偏差(RSD)为0.52%,该方法不但回收率高,且重复性好。

Because the lipin＇ color of the fermented fish meal was deeper red than fish meal and the acid value in Fermented fish meal is higher, when the 《Fish meal GB/T19164-2003 Appendix B》for acid value in Fermented fish meal was used,the accurate end-point of titration was difficuh to determine and the titration volume was too large,which brought a lot of errors.The experiment showed that the above mentioned problem can be solved by reducing the sample weigh from 5g to 2g.The results showed that the the recoveries were 95.1% - 108.8%,the RSDs were 0.52%.The method was simple and accurate.