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NIR model development and robustness in prediction of melon fruit total soluble solids

Guthrie, J.A. and Liebenberg, C.J. and Walsh, K.B. (2006) NIR model development and robustness in prediction of melon fruit total soluble solids. Australian Journal of Agricultural Research, 57 (4). pp. 411-418.

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Article Link(s): http://dx.doi.org/10.1071/AR05123

Publisher URL: http://www.publish.csiro.au

Abstract

Near infrared spectroscopy (NIRS) can be used for the on-line, non-invasive assessment of fruit for eating quality attributes such as total soluble solids (TSS). The robustness of multivariate calibration models, based on NIRS in a partial transmittance optical geometry, for the assessment of TSS of intact rockmelons (Cucumis melo) was assessed. The mesocarp TSS was highest around the fruit equator and increased towards the seed cavity. Inner mesocarp TSS levels decreased towards both the proximal and distal ends of the fruit, but more so towards the proximal end. The equatorial region of the fruit was chosen as representative of the fruit for near infrared assessment of TSS. The spectral window for model development was optimised at 695-1045 nm, and the data pre-treatment procedure was optimised to second-derivative absorbance without scatter correction. The 'global' modified partial least squares (MPLS) regression modelling procedure of WINISI (ver. 1.04) was found to be superior with respect to root mean squared error of prediction (RMSEP) and bias for model predictions of TSS across seasons, compared with the 'local' MPLS regression procedure. Updating of the model with samples selected randomly from the independent validation population demonstrated improvement in both RMSEP and bias with addition of approximately 15 samples.

Item Type:Article
Additional Information:Reproduced with permission from © CSIRO Publishing. Access to published version may be available via Publisher’s website.
Keywords:Brix; chemometric; fruit quality; rockmelon.
Subjects:Technology > Technology (General) > Spectroscopy > NIR (Near Infrared)
Plant culture > Fruit and fruit culture > Culture of individual fruits or types of fruit > Melons
Science > Statistics > Statistical data analysis
Deposited On:02 Feb 2009 03:39
Last Modified:17 Mar 2011 02:35

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