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• W2893839167 abstract "This work aims to investigate the emergence of aggregates caused by redundant plasticizers in the protein matrix of casein based biopolymers using chemical imaging techniques. Near infrared (NIR) images (950-1671 nm) were first acquired and the spatial variations on macroscale with a pixel size of 0.4 mm × 0.5 mm were visualized. The introduction of plasticizers resulted in a strong hydrogen bonding matrix in the protein polymeric film as evidenced by analysis of Fourier transform near infrared (FT-NIR) spectral profiles in the range of 7500-4000 cm-1. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) images (4000-650 cm-1) coupled with principal components analysis (PCA) and multivariate curve resolution alternating least squares (MCR-ALS) analysis suggested the existence of sorbitol re-crystallization after 5 months storage in the ambient condition. Raman images with a higher pixel size of 1.2 µm × 1.2 µm indicated an uneven film surface caused by sorbitol migration and re-crystallization. A partial least squares (PLS) regression model was developed to predict plasticizer concentration based on the mean spectra of FT-NIR hypercubes, producing coefficient of determination in calibration ( [Formula: see text] ) of 0.93, cross-validation ( [Formula: see text] ) of 0.92 and prediction ( [Formula: see text] ) of 0.89. Visualization of aggregates in the image field was obtained by applying the developed PLS model in a pixel-wise manner using single-element and array detectors. The combined information from NIR and FT-NIR evidenced the occurrence of high plasticizer-concentrated regions in the film sample, while the combined information from FT-NIR and ATR-FTIR further confirms the phenomenon of sorbitol re-crystallization." @default.
• W2893839167 created "2018-10-05" @default.
• W2893839167 creator A5008288324 @default.
• W2893839167 creator A5036627793 @default.
• W2893839167 date "2019-02-01" @default.
• W2893839167 modified "2023-10-13" @default.
• W2893839167 title "Investigation of plasticizer aggregation problem in casein based biopolymer using chemical imaging" @default.
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• W2893839167 doi "https://doi.org/10.1016/j.talanta.2018.09.094" @default.
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