Quantitative analysis of minerals and electric conductivity of red grape homogenates by near infrared reflectance spectroscopy

Cozzolino, D, Cynkar, W, Shah, N and Smith, P 2011, 'Quantitative analysis of minerals and electric conductivity of red grape homogenates by near infrared reflectance spectroscopy', Computers and Electronics in Agriculture, vol. 77, no. 1, pp. 81-85.


Document type: Journal Article
Collection: Journal Articles

Title Quantitative analysis of minerals and electric conductivity of red grape homogenates by near infrared reflectance spectroscopy
Author(s) Cozzolino, D
Cynkar, W
Shah, N
Smith, P
Year 2011
Journal name Computers and Electronics in Agriculture
Volume number 77
Issue number 1
Start page 81
End page 85
Total pages 5
Publisher Elsevier BV
Abstract The use of near infrared (NIR) reflectance spectroscopy to measure the concentration of minerals and electric conductivity (EC) in red grape homogenates was investigated. Wine grape samples (n=209) from two vintages, representing a wide range of varieties and regions were analysed by Inductively Coupled Plasma Optical Emission Spectrometry (ICPOES) for the concentrations of calcium (Ca), potassium (K), magnesium (Mg), phosphorus (P), sulphur (S), iron (Fe), and manganese (Mn) and scanned in reflectance in a NIR instrument (400-2500nm). The spectra were pre-processed using multiple scatter correction (MSC) before developing the calibration models using partial least squares (PLS) regression and cross validation. Coefficients of determination in cross validation (R2) and the standard errors of cross validation (SECV) obtained were for Fe (0.60 and 1.49mgkg-1), Mn (0.71 and 0.41mgkg-1), Ca (0.75 and 60.89mgkg-1), Mg (0.84 and 12.93mgkg-1), K (0.78 and 285.34mgkg-1), P (0.70 and 40.19mgkg-1), S (0.88 and 14.45mgkg-1) and EC (0.87 and 7.66mS). The results showed that Mg, S and EC in grape berries might be measured by NIR reflectance spectroscopy.
Subject Food Sciences not elsewhere classified
Sensor Technology (Chemical aspects)
Keyword(s) Chemometrics
Elements
Grapes
Near infrared spectroscopy
DOI - identifier 10.1016/j.compag.2011.03.011
Copyright notice © 2011 Elsevier B.V.
ISSN 0168-1699
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