V. G. Amelin, O. E. Emel’yanov, Z. A. Ch. Shogah, A. V. Tret’yakov
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引用次数: 0
摘要
本文提出了一种非接触式方法,利用智能手机和专用设备在波长为 365、390、850 和 880 纳米的漫反射 LED 上测定瓶装牛奶中乳脂肪的质量分数。分析信号是使用配备了 PhotoMetrix PRO®、ColorGrab 和 RGBer 应用程序的 OnePlus 10 Pro 和 iPhone 14 智能手机以及近红外光谱仪(4000-10000 cm-1)记录的。处理实验数据时使用了专门的软件,包括 TQ Analyst、The Unscrambler X 和 XLSTAT。结果发现,与使用单个 LED 相比,同时使用所有不同波长的 LED 得到的结果相对偏差最小。此外,还发现牛奶透过聚对苯二甲酸乙二醇酯包装时的漫反射率会发生轻微变化,因此可以在不打开包装的情况下进行非接触式分析。使用多元校准数据算法--部分最小二乘回归法评估了测试牛奶样本的乳脂含量。分析结果的相对标准偏差不超过 8%。分析结果的一致性通过近红外光谱区域的傅立叶变换红外光谱进行了确认。
Determination of the Mass Fraction of Milk Fat in Bottled Milk Using a Contactless Colorimetric Method
A contactless method is proposed for determining the mass fraction of milk fat in bottled milk by the diffuse reflectance LED at the wavelengths 365, 390, 850, and 880 nm using a smartphone and a specialized device. The analytical signal was recorded using OnePlus 10 Pro and iPhone 14 smartphones, equipped with PhotoMetrix PRO®, ColorGrab, and RGBer applications, as well as using an FTIR spectrometer for the near-IR region (4000–10 000 cm–1). Specialized software, including TQ Analyst, The Unscrambler X, and XLSTAT, was used to process the experimental data. It was found that using all LEDs with different wavelengths simultaneously yielded results with the smallest relative deviation compared to using individual LEDs. Additionally, a slight change in the diffuse reflectance of milk through polyethylene terephthalate-based packaging was identified, which enabled contactless analysis without opening the packaging. The milk fat content of the test milk samples was evaluated using a multivariate calibration data algorithm—partial least squares regression. The relative standard deviation of the analysis results did not exceed 8%. The consistency of the analysis results was confirmed by FTIR spectroscopy in the near-IR region.
期刊介绍:
The Journal of Analytical Chemistry is an international peer reviewed journal that covers theoretical and applied aspects of analytical chemistry; it informs the reader about new achievements in analytical methods, instruments and reagents. Ample space is devoted to problems arising in the analysis of vital media such as water and air. Consideration is given to the detection and determination of metal ions, anions, and various organic substances. The journal welcomes manuscripts from all countries in the English or Russian language.