[Zurück]

B. Muik, B. Lendl, A. Molina Díaz, L. Pérez-Villarejoa, M.J. Ayora-Cañada:
"Determination of oil and water content in olive pomace using near infrared and Raman spectrometry ";
Analytical and Bioanalytical Chemistry, 379 (2004), S. 35 - 41.

Near IR (NIR) reflectance and Raman spectrometry were compared for detn. of the oil and water content of olive pomace, a byproduct in olive oil prodn. To enable comparison of the spectral techniques the same sample sets were used for calibration (1.74-3.93% oil, 48.3-67.0% water) and for validation (1.77-3.74% oil, 50.0-64.5% water). Several partial least squares (PLS) regression models were optimized by cross-validation with cancellation groups, including different spectral pretreatments for each technique. Best models were achieved with first-deriv. spectra for both oil and water content. Prediction results for an independent validation set were similar for both techniques. The values of root mean square error of prediction (RMSEP) were 0.19 and 0.20-0.21 for oil content and 2.0 and 1.8 for water content, using Raman and NIR, resp. The possibility of improving these results by combining the information of both techniques was also tested. The best models constructed using the appended spectra resulted in slightly better performance for oil content (RMSEP 0.17) but no improvement for water content.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04969547

http://publik.tuwien.ac.at/files/pub-tch_4298.pdf