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- Title
Features of Analysis of Scotch Pine Oleoresin Composition by an NMR Method.
- Authors
Skakovsky, E. D.; Tychinskaya, L. Yu.; Molchanova, O. A.; Gapankova, E. I.; Latyshevich, I. A.; Bogushevich, S. E.; Lamotkin, S. A.
- Abstract
The composition of Scotch pine oleoresin in concentrated and dilute solutions in eight deuterated solvents and carbon tetrachloride (CCl4) was studied by an NMR method. Dilute solutions in CDCl3, CD2Cl2, and HOAc-d4 were found to contain significantly less levopimaric acid than the concentrated ones while the amount of abietic acid simultaneously increased. It was assumed that the high isomerization rate of levopimaric acid to abietic acid in the dilute solutions at room temperature was due to catalytic reactions associated with the acidic nature of the solvents, which must be taken into account when performing NMR analysis. Reactions with atmospheric oxygen occurred with the formation of dehydroabietic acid during aging of the oleoresin. A comparative analysis showed that deuterated benzene was the most acceptable solvent when determining the composition of the oleoresin by an NMR method.
- Subjects
SCOTS pine; ABIETIC acid; PROTOGENIC solvents; ATMOSPHERIC oxygen; CARBON tetrachloride
- Publication
Journal of Applied Spectroscopy, 2023, Vol 90, Issue 3, p616
- ISSN
0021-9037
- Publication type
Article
- DOI
10.1007/s10812-023-01573-z