Comparison of different pre-treatments to improve accuracy of total soluble solids.

Arazuri Garín, Silvia and Diezma Iglesias, Belen and Blanco Orús, Ramón and García Ramos, Francisco Javier (2014). Comparison of different pre-treatments to improve accuracy of total soluble solids.. "Journal of Food, Agriculture & Environment", v. 12 (n. 2); pp. 218-223. ISSN 1459-0263. https://doi.org/10.1234/4.2014.4437.

Description

Title: Comparison of different pre-treatments to improve accuracy of total soluble solids.
Author/s:
  • Arazuri Garín, Silvia
  • Diezma Iglesias, Belen
  • Blanco Orús, Ramón
  • García Ramos, Francisco Javier
Item Type: Article
Título de Revista/Publicación: Journal of Food, Agriculture & Environment
Date: April 2014
ISSN: 1459-0263
Volume: 12
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Ingeniería Rural [hasta 2014]
UPM's Research Group: Técnicas Avanzadas en Agroalimentación LPF-TAGRALIA
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The applicability of a portable NIR spectrometer for estimating the °Brix content of grapes by non-destructive measurement has been analysed in field. The NIR spectrometer AOTF-NIR Luminar 5030, from Brimrose, was used. The spectrometer worked with a spectral range from 1100 to 2300 nm. A total of 600 samples of Cabernet Sauvignon grapes, belonging to two vintages, were measured in a non-destructive way. The specific objective of this research is to analyse the influence of the statistical treatment of the spectra information in the development of °Brix estimation models. Different data pretreatments have been tested before applying multivariate analysis techniques to generate estimation models. The calibration using PLS regression applied to spectra data pretreated with the MSC method (multiplicative scatter correction) has been the procedure with better results. Considering the models developed with data corresponding to the first campaign, errors near to 1.35 °Brix for calibration (SEC = 1.36) and, about 1.50 °Brix for validation (SECV = 1.52) were obtained. The coefficients of determination were R2 = 0.78 for the calibration, and R2 = 0.77 for the validation. In addition, the great variability in the data of the °Brix content for the tested plots was analysed. The variation of °Brix on the plots was up to 4 °Brix, for all varieties. This deviation was always superior to the calculated errors in the generated models. Therefore, the generated models can be considered to be valid for its application in field. Models were validated with data corresponding to the second campaign. In this sense, the validation results were worse than those obtained in the first campaign. It is possible to conclude in the need to realize an adjustment of the spectrometer for each season, and to develop specific predictive models for every vineyard.

More information

Item ID: 29203
DC Identifier: http://oa.upm.es/29203/
OAI Identifier: oai:oa.upm.es:29203
DOI: 10.1234/4.2014.4437
Official URL: https://www.wflpublisher.com/Abstract/4437
Deposited by: Memoria Investigacion
Deposited on: 12 Jun 2014 15:02
Last Modified: 11 Apr 2019 10:15
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