Abstract
Raman spectroscopy has been applied to study unsaturated fatty acid in edible vegetable oils. The relative intensity ratio of characteristic vibrational bands has been investigated as a function of the content of totally unsaturated fatty acid, polyunsaturated fatty acid, and monounsaturated fatty acid. The results suggest the intensity ratio of 1655 cm-1 to 1440 cm-1 or 1265 cm-1 to 1300 cm-1, i.e., a characteristic vibrational band correlated with carbon-carbon double bond in acid chain to a vibrational band not correlated with double bond, could be applied for preliminary analysis of the content of polyunsaturated fatty acid or monounsaturated fatty acid, but cannot be used to analyze the content of total unsaturated fatty acid. Additionally, two-dimensional correlation spectroscopy (2DCOS) has been performed on the content dependent Raman spectra. The 2DCOS result is consistent with that by Raman spectroscopy.
| Original language | English |
|---|---|
| Article number | 2807 |
| Journal | Applied Sciences (Switzerland) |
| Volume | 9 |
| Issue number | 14 |
| DOIs | |
| State | Published - 1 Jul 2019 |
Bibliographical note
Funding Information:Funding: This research was funded by the National Natural Science Foundation of China (Grant No. 11574241) and the National Research Foundation of Korea (NRF) grant funded by the Korean Ministry of Science and ICT (No. 2017R1A2B2009309).
Publisher Copyright:
© 2019 by the authors.
Keywords
- 2DCOS
- Edible vegetable oil
- Raman spectroscopy
- Relative intensity ratio
- Unsaturated fatty acid