Artículo
Simplified method for the screening of technological maturity of red grape and total phenolic compounds of red grape skin: Application of the characteristic vector method to near-infrared spectra
Autor/es | Nogales Bueno, Julio
Ayala Zurbano, Fernando Hernández Hierro, José Miguel Rodríguez Pulido, Francisco José Echávarri, José Federico Heredia Mira, Francisco José |
Departamento | Universidad de Sevilla. Departamento de Nutrición y Bromatología, Toxicología y Medicina Legal |
Fecha de publicación | 2015 |
Fecha de depósito | 2016-06-03 |
Publicado en |
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Resumen | Characteristic vector analysis has been applied to near-infrared spectra to extract the main spectral information
from hyperspectral images. For this purpose, 3, 6, 9, and 12 characteristic vectors have been used to ... Characteristic vector analysis has been applied to near-infrared spectra to extract the main spectral information from hyperspectral images. For this purpose, 3, 6, 9, and 12 characteristic vectors have been used to reconstruct the spectra, and root-mean-square errors (RMSEs) have been calculated to measure the differences between characteristic vector reconstructed spectra (CVRS) and hyperspectral imaging spectra (HIS). RMSE values obtained were 0.0049, 0.0018, 0.0012, and 0.0012 [log(1/R) units] for spectra allocated into the validation set, for 3, 6, 9, and 12 characteristic vectors, respectively. After that, calibration models have been developed and validated using the different groups of CVRS to predict skin total phenolic concentration, sugar concentration, titratable acidity, and pH by modified partial least-squares (MPLS) regression. The obtained results have been compared to those previously obtained from HIS. The models developed from the CVRS reconstructed from 12 characteristic vectors present similar values of coefficients of determination (RSQ) and standard errors of prediction (SEP) than the models developed from HIS. RSQ and SEP were 0.84 and 1.13 mg g−1 of skin grape (expressed as gallic acid equivalents), 0.93 and 2.26 °Brix, 0.97 and 3.87 g L−1 (expressed as tartaric acid equivalents), and 0.91 and 0.14 for skin total phenolic concentration, sugar concentration, titratable acidity, and pH, respectively, for the models developed from the CVRS reconstructed from 12 characteristic vectors |
Cita | Nogales Bueno, J., Ayala Zurbano, F., Hernández Hierro, J.M., Rodríguez Pulido, F.J., Echávarri, J.F. y Heredia Mira, F.J. (2015). Simplified method for the screening of technological maturity of red grape and total phenolic compounds of red grape skin: Application of the characteristic vector method to near-infrared spectra. Journal of Agricultural and Food Chemistry, 63 (17), 4284-4290. |
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