国外牛奶中尿素含量检测新进展

目前,人们已意识到牛奶中的尿素含量不仅是衡量奶场蛋白代谢效率、氮利用率及产奶量等问题的有效指标,其还在作为监测奶场氨排放指标方面也显现出潜力。近十年中红外光谱技术被广泛应用于尿素检测,虽然其分析性能稍差于其它常规分析方法,但由于其具有简易的物流过程,对样品的大吞吐处理能力及低分析本所拥有的可观性价比等优点,很适宜于实际应用,故在短短几年内各种红外分析仪器迅速涌入市场。对偏最小二乘法(PLS)校正概念方面进行了简略讨论;对红外分析仪器的稳定性、校正及校正控制、参比法分析性能、样品质量及温度控制等关键技术方面进行了评估。

THE NEW DEVELOPMENT OF UREA DETERMINATION IN MILK ABOUT FOREIGN COUNTRIES

urea measurements in milk are nowadays recognized as a useful indicator for the efficiency of protein metabolism, nitrogen utilization and fertility problems in dairy cattle. Furthermore, potential has been shown as an indicator for the monitoring of ammonia emissions from dairy farms. The application of infra-red spectrometry for urea determinations has increased tremendously during the last decade. Although the analytical performance in it salf is less than with other routine methods, it is the ease of the logistical processes, the high-capacity throughput and the low cost per sample which have created an attractive price/performance fation for its application in practice. During the yeas, Various infra-red instruments have been introduce to the market. The PLS-based calibration concepts used are briefly discussed. Critical aspects, such as instrument stability, calibration and calibration control, quality of reference analysis, sample quality and temperature control, are evaluated.