对GB 19301-2010《生乳》中蛋白质和菌落总数的指标验证和建议

Indexes verification of protein and aerobic plate count in GB 19301-2010 and its recommendations

中文关键词:  生乳, 蛋白质, 菌落总数, 跟踪评价

英文关键词:raw milk, protein, aerobic plate count, tracking assessment

中文摘要:

      目的 完成“GB 19301-2010《生乳》跟踪评价项目”。方法 对陕西省7家乳企使用的原料生乳进行了7次采样, 样本量为111份, 其中夏季51份, 冬季60份, 采用GB 5009.5和GB 4789.2分别对样本中的蛋白质和菌落总数进行了测定。结果 所有样本的蛋白质含量都是合格的, 冬季、夏季生乳蛋白质含量分别均不低于3.6 g/100 g、2.8 g/100 g, 其中16%的夏季生羊乳蛋白质检测值为2.8 g/100 g, 是“生乳蛋白质指标”的界限值。所有样本中, 只有夏季4份样本的菌落总数超过了2.0×106 CFU/mL的指标界限值, 冬季、夏季生乳菌落总数平均值分别低于1.0×105 CFU/mL、1.0×106 CFU/mL。结论 GB 19301规定的生乳蛋白质、菌落总数指标值是科学合理的, 建议将夏季生羊乳的蛋白质指标修订为≥2.6 g/100 g。

英文摘要:

      Objective To complete the project of GB 19301-2010, National Food Safety Standard Raw milk, tracking assessment. Method Totally 111 raw milk and raw goat milk samples were collected from 7 Shaanxi dairy companies, including 51 samples in summer and 60 samples in winter, and GB 5009.5 and GB 4789.2 were used to measure the protein and aerobic plate count. Results The protein content of all samples is qualified, and the measured values were not less than 3.6 g/100 g and 2.8 g/100 g in winter and summer, the protein content of 16 percent of raw goat milk in summer was 2.8 g/100 g which was just the protein limited value. Aerobic plate count in only 4 samples was more than 2.0×106 CFU/mL which was its limited value, and the measured values were less than 1.0×105 CFU/mL and 1.0×106 CFU/mL in winter and summer. Conclusion: The protein and aerobic plate count in raw milk were scientific and reasonable, and the protein limited value of raw goat milk in summer was recommended to be revised to 2.6 g/100 g.