乳粉离心沉淀率的检测

Determination of centrifugal sedimentation rate of milk powder

目的建立一种快速测定乳粉离心沉淀率的方法,以利于快速、准确测定样本的离心沉淀率,以期为间接评价乳粉质量提供科学依据。方法不同乳粉样品经溶解、静置、水浴、灭菌后,将待测样品离心后,得到沉淀物质量,从而计算乳粉的离心沉淀率。结果实验针对离心速度、离心温度、离心角度和离心管大小等条件研究考察,通过数据分析,得出实验优化条件。通过对425个品质良好的全脂乳粉和脱脂乳粉样品的检测,其离心沉淀率均低于1.2%,当乳粉离心沉淀率低于1.2%时,能够间接判定乳粉质量的优劣。结论该方法简便易操作,且操作实验过程中不涉及其他药品,实验对操作者专业技能要求较低,能够满足不同生产规模企业的需要。

Objective To establish a method for rapid determination of centrifugal sedimentation rate of milk powder, which is helpful for the rapid and accurate determination of centrifugal sedimentation rate of samples in order to provide scientific basis for the indirect evaluation of the quality of milk powder. Methods The different milk power samples were dissolved, standed, water bathed, sterilized. After the samples being centrifuged, the quality of precipitate was obtained, and the centrifugal sedimentation rate of the milk powder was calculated. Results The experiment was carried out to investigate the conditions of centrifugal speed, centrifugal temperature, centrifugal angle and size of centrifuge tube. Through analysis of these data, the optimized experimental conditions were obtained. Through the detection of 425 good quality of whole milk powder and skim milk powder samples, the centrifugal precipitation rates of these samples were less than 1.2%. The results of the milk powder centrifugal sedimentation rate less than 1.2% could indirectly determine the quality of milk powder. Conclusion The method is simple and easy to operate, the operation of the experiment process does not involve other chemicals, and experiments require less technical skills of the operator, which can meet the needs of enterprises of different production scales.