NONDESTRUCTIVE OLIVE QUALITY DETECTION USING FT-NIR SPECTROSCOPY IN REFLECTANCE MODE
Quality features including firmness, oil content, and color (chroma, hue) of two olive (Olea europaea L.) varieties (Ayvalik and Gemlik) were predicted using FT-NIR spectroscopy. Reflectance measurements of intact olives were performed using a bifurcated fiber optic probe. Measurements of firmness, oil content, and color values were done following the spectral measurements using standard methods. Calibration methods were developed using the partial least squares method. Good correlations were obtained in calibration and validation for Magness-Taylor (MT) maximum force, which was used as a measure of firmness, for both Ayvalik and Gemlik varieties; the coefficient of determination (R2) for Gemlik olives was 0.74 (SEC = 1.27) in calibration and 0.67 (SEP = 1.37) in validation. Better oil content prediction of olive fruits was obtained for the pooled data of Ayvalik and Gemlik varieties with the R2 value of 0.64 (SEP = 0.05) in validation. Higher correlations were obtained for color predictions with R2 = 0.88 and SEP = 12.9 for chroma and R2 = 0.86 and SEP = 0.10 for hue for Gemlik. Similar color prediction results were obtained for the Ayvalik variety.
Kavdir, I., Buyukcan, M.B., Kocabiyik, H., Lu, R. and Seker, M. (2009). NONDESTRUCTIVE OLIVE QUALITY DETECTION USING FT-NIR SPECTROSCOPY IN REFLECTANCE MODE. Acta Hortic. 824, 373-380
FT-NIR spectroscopy, olive, firmness, oil content, chroma, hue