Applications of near infrared spectroscopy to determine oil to dry mesocarp, iodine value and β-carotene for oil palm breeding
2017
Wong, Choo Kien | Chin, Shenyang
The usage of NIRS to determine oil quality parameters for palm oil is not entirely novel as studies have been carried out to determine the suitability of using NIR wavelength for Iodine Value (IV), free fatty acids (FFA), peroxide value, β-carotene, palm oil residue in palm kernel methyl esters and palm oil methyl esters. It has also been used to study oil loss in palm oil mills by analysing residual oil content in press fibre, palm oil sludge, steriliser condensate and empty fruit bunches. The application of NIRS for routine analysis in oil palm breeding is an interesting prospect given (i) the larger range of values obtained in analysis due to genetic variation compared to samples obtained from commercial bulk, (ii) the ability to perform analysis with minimal sample preparation and without the usage of organic solvents, (iii) the advantage of analysing multiple parameters for crude palm oil samples simultaneously. In this study, we developed calibration models for Oil to Dry Mesocarp (ODM), Iodine Value (IV) and β-carotene content using conventional methods as reference data. Furthermore, a validation step was performed using independent set of samples. In brief, the sample number (n), coefficient of determination (r2) for (i) calibration, (ii) validation and (iii) standard error prediction (SEP) were satisfactory i.e. n=573, r2=0.959; n=442, r2=0.889; SEP=1.284 (%) for ODM, n=1238, r2=0.978; n=3051, r2=0.892; SEP=0.978 (unit) for IV and n=728, r2=0.978; n=142, r2=0.952; SEP=54.491 (ppm) for β-carotene.
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