Research Article
Detection of Lard in Ink Extracted from Printed Food Packaging Using Fourier Transform Infrared Spectroscopy and Multivariate Analysis
Table 1
Characteristic functional groups assignment of lard.
| | Wavenumbers (cm−1) | Functional group | Mode of vibration/assignment |
| | 721 |
–(CH2–, –HC=CH– (cis) | Rocking, bending out | | 1096 | –C–H | Bending | | 1160 | =C–H (cis) | Symmetric rocking | | 1377 | –C–H (CH3) | Symmetric bending | | 1464 | –C–H (CH2, CH3) | Bending | | 1747 | –C=O (ester) | Stretching | | 2850–2980 | –C–H (CH2, CH3) | Symmetric and asymmetric stretching | | 3007 | –C–H (CH2, CH3) | Symmetric and asymmetric stretching |
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