SOMATIC CELLS LEVEL ON THE PHYSICOCHEMICAL PROFILE OF POWDERED MILK

Abstract The objective of this study was to evaluate the level of somatic cells (SCC) on the physical-chemical profile of powdered milk. From January 2010 to June 2011, we analyzed seven raw milk samples and the respective powdered milk, totaling 14 samples from an industry in São Luís de Montes Belos-GO. Raw milk was analyzed for somatic cell counting and powdered milk for physical and chemical characteristics: acidity, moisture, protein, and fat. Two treatments were evaluated: powdered milk made from milk containing SCC ≤ 400,000 cells/mL and powdered milk prepared with SCC > 400,000 cells/mL. The experimental design was in randomized blocks. For the statistical analysis we used analysis of variance, followed by Tukey test, considering p < 0.05 as the minimum acceptable probability for the difference between means. The powdered milk prepared with raw material with SCC superior to 400,000 cells/mL presented lower protein and higher humidity content. Considering the treatments, we can state that to obtain powder milk satisfactorily, it is necessary to use milk with SCC lower than 400,000 cells/mL.

摘要：本研究旨在探究体细胞计数（Somatic Cell Count，SCC）对奶粉理化特性的影响。2010年1月至2011年6月期间，研究团队采集了来自戈亚斯州圣路易斯-蒙特斯贝洛斯（São Luís de Montes Belos-GO）一家乳品企业的7份生鲜乳样品及其对应成品奶粉样品，总计14份实验样品。对生鲜乳开展体细胞计数检测，对奶粉则进行酸度、水分、蛋白质及脂肪等理化指标分析。本研究设置两组处理：分别以体细胞数≤400000个/mL的生鲜乳为原料制备的奶粉，以及以体细胞数>400000个/mL的生鲜乳为原料制备的奶粉。实验采用随机区组设计，统计分析先采用方差分析，后续辅以Tukey多重比较检验，以p<0.05作为均值差异具有统计学意义的最低判定阈值。结果显示，以体细胞数高于400000个/mL的生鲜乳为原料制备的奶粉，其蛋白质含量更低，水分含量更高。综合两组处理结果可知，若要制备品质合格的奶粉，需采用体细胞数低于400000个/mL的生鲜乳作为原料。