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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(a) Raw MIR spectra (500–4000 cm−1) of PBS samples (concentration range: 0–20 mmol/L) (b) the raw spectra after noise removal and base lactate correction (n = 15). Several peaks were identified in the footprint region (700–1500 cm−1).