Tu Zhiyang Stan, Irudayaraj Joseph, Lee Youngsoo
Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Foods. 2023 Jan 19;12(3):467. doi: 10.3390/foods12030467.
Emerging portable near infrared (NIR) spectroscopic approaches coupled with data analysis and chemometric techniques provide opportunities for the rapid characterization of spray-dried products and process optimization. This study aimed to enhance the understanding of applying NIR spectroscopy in spray-dried samples by comparing two sample preparation strategies and two spectrometers. Two sets of whey protein-maltodextrin matrixes, one with a protein content gradient and one with a consistent protein content, were spray-dried, and the effect of the two preparation strategies on NIR calibration model development was studied. Secondly, a portable NIR spectrometer (PEAK) was compared with a benchtop NIR spectrometer (CARY) for the moisture analysis of prepared samples. When validating models with the samples with focused protein contents, the best PLS protein models established from the two sample sets had similar performances. When comparing two spectrometers, although CARY outperformed PEAK, PEAK still demonstrated reliable performance for moisture analysis, indicating that it is capable as an inline sensor.
新兴的便携式近红外（NIR）光谱方法与数据分析和化学计量技术相结合，为喷雾干燥产品的快速表征和工艺优化提供了机会。本研究旨在通过比较两种样品制备策略和两台光谱仪，加深对近红外光谱在喷雾干燥样品中应用的理解。对两组乳清蛋白-麦芽糊精基质进行喷雾干燥，一组具有蛋白质含量梯度，另一组具有一致的蛋白质含量，研究了两种制备策略对近红外校准模型开发的影响。其次，将一台便携式近红外光谱仪（PEAK）与一台台式近红外光谱仪（CARY）用于制备样品的水分分析进行比较。在用蛋白质含量集中的样品验证模型时，从两组样品中建立的最佳偏最小二乘法（PLS）蛋白质模型具有相似的性能。在比较两台光谱仪时，虽然CARY优于PEAK，但PEAK在水分分析中仍表现出可靠的性能，表明它能够作为在线传感器。
