TY - JOUR
T1 - Determination of Total Phenolic Content in Olive Oil Samples by UV-visible Spectrometry and Multivariate Calibration
AU - Fuentes, Edwar
AU - Báez, María E.
AU - Bravo, Manuel
AU - Cid, Camila
AU - Labra, Fabián
N1 - Funding Information:
Acknowledgments The authors thank FONDECYT for financial support through Project 1110114.
PY - 2012/12
Y1 - 2012/12
N2 - The viability of determining the total phenolic content in olive oil samples by chemometric analysis of UV-vis spectral data was studied. As a result, a novel spectrophotometric method that does not require prior analyte separation is proposed. The method uses partial least squares (PLS) regression modeling in conjunction with UV-vis absorption spectral data obtained on oil samples dissolved in hexane. The resulting PLS model was developed by correlating the total phenolic content determined by Folin-Ciocalteu assay with the spectral data of oil solution between 210 and 340 nm. The predictive ability of the model was good as indicated by the root mean square error of prediction (RMSEP) and relative error (6. 7 mg kg -1 and 6. 1%, respectively) obtained for analysis of the validation set of samples. The principal figures of merit, namely limit of detection (7. 3 mg kg -1), analytical sensitivity (1. 0 mg kg -1) and precision (<10% RSD) were considered adequate for routine analysis. The proposed method was applied in the determination of total phenolic content in Chilean extra virgin olive oil (VOO) samples from the 2009 and 2010 harvest period. The results were compared to those determined with liquid chromatography.
AB - The viability of determining the total phenolic content in olive oil samples by chemometric analysis of UV-vis spectral data was studied. As a result, a novel spectrophotometric method that does not require prior analyte separation is proposed. The method uses partial least squares (PLS) regression modeling in conjunction with UV-vis absorption spectral data obtained on oil samples dissolved in hexane. The resulting PLS model was developed by correlating the total phenolic content determined by Folin-Ciocalteu assay with the spectral data of oil solution between 210 and 340 nm. The predictive ability of the model was good as indicated by the root mean square error of prediction (RMSEP) and relative error (6. 7 mg kg -1 and 6. 1%, respectively) obtained for analysis of the validation set of samples. The principal figures of merit, namely limit of detection (7. 3 mg kg -1), analytical sensitivity (1. 0 mg kg -1) and precision (<10% RSD) were considered adequate for routine analysis. The proposed method was applied in the determination of total phenolic content in Chilean extra virgin olive oil (VOO) samples from the 2009 and 2010 harvest period. The results were compared to those determined with liquid chromatography.
KW - Multivariate calibration
KW - Olive oil
KW - Phenolic content
KW - UV-visible spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=84867682810&partnerID=8YFLogxK
U2 - 10.1007/s12161-012-9379-5
DO - 10.1007/s12161-012-9379-5
M3 - Article
AN - SCOPUS:84867682810
VL - 5
SP - 1311
EP - 1319
JO - Food Analytical Methods
JF - Food Analytical Methods
SN - 1936-9751
IS - 6
ER -