Spatially offset Raman spectroscopy (SORS) collects the Raman scattered signal at some distance from the excitation laser spot on the sample. In this way, the Raman spectra are recovered from the sample's sub-surface through the packaging, providing a characteristic fingerprint of the product which can be further analysed chemometrically. This is a relatively new technique, and this review examines all the studies reported to date, where SORS is applied to analyse different foods and beverages, permitting rapid, non-invasive analysis to ensure quality control and authentication of raw materials and end products.
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