Fundamentals of ATR-FTIR Spectroscopy and Its Role …
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Fig. 10 In-situ ATR-FTIR absorption profiles for the varying ionizing states of l-Phe amino acid
(100 mM) in aqueous solution with pH values of a 1.5 (cationic), b 5.8 (zwitterionic), and c 12.2
(anionic), respectively. The molecular structural form of l-Phe in aqueous media at different pH
values are shown in the inset. Corresponding SEM images of dried l-Phe samples at d pH 1.5, e pH
5.8 and f pH 12.2 (2 μm scale). Adapted with permission from [26]. Copyright, 2019, The Royal
Society of Chemistry
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Fig. 10 In-situ ATR-FTIR absorption profiles for the varying ionizing states of l-Phe amino acid
(100 mM) in aqueous solution with pH values of a 1.5 (cationic), b 5.8 (zwitterionic), and c 12.2
(anionic), respectively. The molecular structural form of l-Phe in aqueous media at different pH
values are shown in the inset. Corresponding SEM images of dried l-Phe samples at d pH 1.5, e pH
5.8 and f pH 12.2 (2 μm scale). Adapted with permission from [26]. Copyright, 2019, The Royal
Society of Chemistry