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- Title
What is cooking in your kitchen: seeing "invisible" with time-resolved coherent anti-Stokes Raman spectroscopy.
- Authors
Zhu, Hanlin; Xu, Chenran; Yakovlev, Vladislav V.; Zhang, Delong
- Abstract
Cooking oil is a critical component of human food and its main component, lipid, is influential to health, but assessing its authenticity and quality can be challenging due to its complex chemical composition. In this study, we introduce a novel application of time-resolved coherent anti-Stokes Raman scattering (T-CARS) spectroscopy for detecting adulteration and understanding the mechanisms of lipid oxidation in various cooking oils. Our research surpasses the limitations of conventional spontaneous Raman spectroscopy, demonstrating that intra-molecular interactions from unsaturated bonds in triglycerides significantly influence vibrational dephasing time. We observed that these dephasing times, although diverse initially, converge to a similar value after heating cycles. Notably, a longer vibrational dephasing of the CH2 symmetric stretching mode was found to correlate with a higher lipid oxidation rate. These findings underscore the potential of T-CARS in identifying and characterizing subtle molecular interactions, offering a transformative approach to understanding molecular dynamics. This research paves the way for broader applications of T-CARS across fields such as chemistry, biomedicine, and material science, marking a significant advancement in the development of innovative analytical techniques.
- Subjects
ANTI-Stokes scattering; MATERIALS science; EDIBLE fats &; oils; MOLECULAR interactions; MOLECULAR dynamics; RAMAN spectroscopy
- Publication
Analytical & Bioanalytical Chemistry, 2023, Vol 415, Issue 26, p6471
- ISSN
1618-2642
- Publication type
Article
- DOI
10.1007/s00216-023-04923-0