QUANTITATIVE-ANALYSIS OF CHOLESTEROL AND CHOLESTEROL ESTER MIXTURES USING NEAR-INFRARED FOURIER-TRANSFORM RAMAN-SPECTROSCOPY

Citation
P. Lecacheux et al., QUANTITATIVE-ANALYSIS OF CHOLESTEROL AND CHOLESTEROL ESTER MIXTURES USING NEAR-INFRARED FOURIER-TRANSFORM RAMAN-SPECTROSCOPY, Applied spectroscopy, 50(10), 1996, pp. 1253-1257
Citations number
22
Categorie Soggetti
Instument & Instrumentation",Spectroscopy
Journal title
ISSN journal
00037028
Volume
50
Issue
10
Year of publication
1996
Pages
1253 - 1257
Database
ISI
SICI code
0003-7028(1996)50:10<1253:QOCACE>2.0.ZU;2-R
Abstract
Near-infrared Fourier transform Raman spectroscopy is a rapid and nond estructive technique that can provide reliable qualitative in situ inf ormation about the chemistry of biological samples. We have combined t his technique with partial least-squares (PLS) regression to perform a quantitative determination of free and esterified cholesterol in two synthetic sample series. In 66 ternary mixtures containing various pro portions of cholesterol, cholesterol linoleate, and oleate, the standa rd errors of prediction were 1.27, 1.17, and 0.94%, respectively. For the second series of experiments concerning the sensitive problem of q uantitative analysis of cholesterol palmitate and stearate mixtures, t he standard error of prediction for 49 samples was 3.02%. It is also p ossible to extract quantitative information for a single component of the ternary mixtures independently. These results are of great importa nce when-as in the case of arterial samples-many chemical species are present. Comparison between Raman spectra of ternary mixtures and athe rosclerotic rabbit aorta shows that many bands, assignable to free and esterified cholesterol, are easily observed in the aorta spectrum.