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| Differential Analysis of Chenpi from Different Producing Areas Based on Infrared Spectroscopy |
| YANG Feng**, XUE Kun-lun, ZHOU Hong-li *, JIN Xing *
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| School of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China |
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Abstract This study used Fourier Transform Infrared Spectroscopy (FT-IR) and Second Derivative Infrared Spectroscopy (SD-IR) to differentiate citrus peels (Chenpi) from various geographical origins. The FT-IR results revealed common absorption peaks of stretching vibrations across all samples at 3400~3429 cm-1 (-OH), 2925 cm-1 (C-H), and 1743 cm-1 (C=O), indicating the presence of hydroxyl compounds, alkyl chains, and ester/ketone components (e.g., hesperidin derivatives)?. Notably, S5, S12, and S13 distinctive fingerprint regions with characteristic peaks at 3427~3429 cm-1, 1242 cm-1, and 536 cm-1, respectively, enabling preliminary differentiation from other samples?. The SD-IR technique amplified peak intensity variations and identified unique low-wavenumber peaks (e.g., 1606 cm-1 for S6 and 816 cm-1 for S8), while leveraging differential peak intensities (e.g., S2's strong peak at 1647 cm-1 and S1's prominent peak at 2925 cm-1) to achieve precise discrimination among remaining samples?. This work demonstrates that the combination of FT-IR and SD-IR provides an efficient, non-destructive analytical approach for origin tracing and quality control of ChenPi.
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Published: 20 December 2025
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