Research Article
Detection of Lard in Ink Extracted from Printed Food Packaging Using Fourier Transform Infrared Spectroscopy and Multivariate Analysis
Table 2
Characteristic functional groups assignment of commercial ink.
| | Wavenumbers (cm−1) | Functional group | Mode of vibration/assignment |
| | 700–610 | –C≡C–H: C–H alkynes | — | | 1200–1000 | C–O, C–O–C | Stretching, asymmetric stretching | | 1466, 1369 | C–H | Deformation | | 1720 | C=O (carbonyl group) | — | | 3575–3125 | O–H (hydroxyl group) | — |
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