Abstract
In the present work a model was developed for the prediction of the oil content of the mesocarp of fruit from the macauba palm, using visible and near infrared spectrometry. Reference values were determined the by Soxhlet method. The model was calibrated using spectral data from the mesocarp of macauba fruit by partial least squares regression, considering nine latent variables. The results of the calibration series were consistent with those of the validation series, registering an The coefficient of determination between the reference method and the developed model, systematic error between the predicted values and the measured values and root mean square error, for calibration and validation with independent data, respectively, equal to 0.8223, -9.2-14 and 5.917 and 0.7760, 7.081 and -0.064. VIS-NIR spectroscopy is a viable tool in the evaluation of genotypes in breeding programs for the macauba palm.
Highlights
Oil from the mesocarp, which is rich in oleic acid (COCININI, 2012; COIMBRA; JORGE, 2011), is of great demand in the food industry, and especially the energy industries because of its suitability for biodiesel production
The aim of this work was to develop a model for predicting the oil content of the mesocarp of macauba fruit using visible and near infrared (VIS-NIR) spectrometry
The variation in oil content seen between the samples, from 0.30 to 55.67% for the calibration set and 0.44 to 56.03% for the validation set, suggests that the variability between samples was suitable for analysis
Summary
Ex Mart.] is a rustic oilseed which, due to the high oil content of its fruit, has high productivity and great potential. Oil extracted from the endosperm is rich in lauric acid (BORA; ROCHA, 2004; COIMBRA; JORGE, 2011), and is a valuable raw material in the cosmetic industry. Another application of economic importance is the use of its endocarp carbon in metallurgical and steelmaking operations. One of the difficulties faced by researchers is being able to access this information in the fruit due to the laborious and expensive processes of conventional methods of evaluation (QUAMPAH et al, 2012). The evaluation of a single sample to determine the oil content using the standard method, Soxhlet, requires approximately 50 hours between prior preparation of the sample and the extraction itself, without taking into consideration that the solvent (n-hexane) used for extraction of the oil is toxic and polluting
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