Abstract
Near-infrared (NIR) spectroscopy and hyperspectral imaging allow the study of spectral and spatial distribution of multiple chemical components in large sample areas. This technique is fast, non-destructive, contactless, and does not require sample preparation. The NIR spectrum of each sample pixel is acquired, resulting in a data cube that contains two spatial dimensions (x and y) and one spectral dimension (z), providing the spectral profiles of every part of the sample. This technique, for example, can provide significant information about the distribution of additives into polymer matrices with potential to be used as a tool for real-time quality control. Herein, the stepwise application of this method is demonstrated for determination of spatial and spectral distributions of film components, showcasing the plasticization of a biodegradable packaging.
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Acknowledgments
The authors are grateful for the financial support of Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001. We also thank Cristiane Vidal for the experimental support in the HSI acquisition and Prof. Celio Pasquini for promptly receiving us in the laboratory that he coordinates (Grupo de Instrumentação e Automação em Química Analítica, Instituto de Química, Universidade Estadual de Campinas, Campinas-SP, Brazil) to obtain the images. C. L. G. and C. C. P. gratefully acknowledge funding support from National Science Foundation under award numbers CBET-1756999. C. L. G. and C. C. P. also acknowledge the National Institute of Food Agriculture, US Department of Agriculture, award numbers 2021-67017-33344, 2020-67021-31375, and 2018-672 67016-27578 awarded as a Center of Excellence for financial support.
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Roque, J.V. et al. (2024). Mapping the Distribution of Additives Within Polymer Films Through Near-Infrared Spectroscopy and Hyperspectral Imaging. In: Otoni, C. (eds) Food Packaging Materials. Methods and Protocols in Food Science . Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3613-8_10
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