Reliability results in the assessment of milk composition by an ultrasonic analyzer
Reliability results in the assessment of milk composition by an ultrasonic analyzer
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发表时间：
2019
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通讯作者：
Y. Hachana;Iheb Frija;Mohamed Elguider;H. Hamed
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作者：
Y. Hachana;Iheb Frija;Mohamed Elguider;H. Hamed
本研究的目的是评价与参考方法相比，超声牛奶分析仪的准确性和可重复性。同时，使用超声波分析仪、傅立叶变换中红外牛奶分析仪和标准方法评估牛奶成分。使用不同的统计参数比较了脂肪、蛋白质和乳糖含量的不同分析方法所得结果。校准后的超声波分析仪与中红外、Gerber法和凯氏定氮法测定结果的重复性和可靠性相当。超声波法低估了约1克/升的脂肪浓度和高估了约1.2克/升的蛋白质含量，而中红外方法显示的结果非常接近所有牛奶成分的直接方法。校准良好的超声波分析仪可能是突尼斯小型乳制品加工单位和牛奶收集中心牛奶分析传统方法的替代品，因为傅立叶变换中红外仪器非常昂贵，需要训练有素的技术人员。
The objectives of the study were to evaluate the accuracy and the repeatability of ultrasonic milk analyzers compared to reference methods. At the same time, milk composition was assessed using an ultrasonic analyzer, Fourier transform mid-infrared milk analyzer, and standard methods. The results obtained by the different analytical methods for fat, protein, and lactose contents were compared using different statistical parameters. The repeatability and reliability of the results obtained with the calibrated ultrasonic analyzer were comparable with those obtained using mid-infrared, Gerber method, and Kjeldahl method. The ultrasonic method underestimated the fat concentration by about 1 g/L and overestimated protein content by about 1.2 g/L, while the mid-infrared method showed results very close to the direct methods for all milk components. Well calibrated ultrasonic analyzers might be an alternative to conventional methods of milk analysis in small dairy processing units and milk collection centers in Tunisia because Fourier transform mid-infrared instruments are very expensive and need highly trained technicians.