Use of temperature dependent Raman spectra to improve accuracy for analysis of complex oil-based samples: Lube base oils and adulterated olive oils
- Title
- Use of temperature dependent Raman spectra to improve accuracy for analysis of complex oil-based samples: Lube base oils and adulterated olive oils
- Author
- 정회일
- Keywords
- Raman spectral selectivity; Temperature-sensitive molecular vibration; Generalized two-dimensional correlation analysis; Lube base oil; Viscosity; Adulterated olive oil
- Issue Date
- 2012-12
- Publisher
- Elsevier Science B.V., Amsterdam.
- Citation
- Analytica chimica acta, 2012, 748, P.58-66
- Abstract
- A simple and effective strategy to improve accuracy for Raman spectroscopic analysis of complex mixture samples by probing a measurement temperature yielding enhanced spectral selectivity has been demonstrated. For the evaluation, the determination of Kinematic Viscosity at 40 degrees C (KV@40) of lube base oil (LBO) samples was initially attempted. Partial least squares (PLS) was used to determine the KV@40 using Raman spectra of the samples collected at 8 different temperatures from 20 to 90 degrees C with 10 degrees C increments. Interestingly, the distinct temperature-induced spectral variation among the samples occurred at 50 degrees C, thereby resulting in the improved accuracy for determination of KV@40. Two-dimensional (2D) correlation analysis was also performed to find an additional supportive rationale for the improved accuracy. The strategy was further evaluated for the identification of soybean oil-adulterated olive oils using linear discriminant analysis (LDA). Similarly, the discrimination accuracy was improved around 80-90 degrees C due to the enhanced spectral selectivity between olive and soybean oils. In overall, these two results successfully demonstrate analytical effectiveness of the strategy. (C) 2012 Elsevier B.V. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S0003267012011981http://hdl.handle.net/20.500.11754/48401
- ISSN
- 0003-2670
- DOI
- 10.1016/j.aca.2012.08.028
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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