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ISHS Acta Horticulturae 487: VI International Symposium on Processing Tomato & Workshop on Irrigation & Fertigation of Processing Tomato

RAPID, NONDESTRUCTIVE METHOD FOR DETERMINATION OF PROCESSED SOLUBLE SOLIDS IN INTACT UNPROCESSED TOMATO FRUIT USING NEAR INFRARED SPECTROMETRY

Authors:   K.H.S. Peiris, G.G. Dull, R.G. Leffler, S.J. Kays
Keywords:   Nondestructive quality evaluation, internal quality, NIR, processing tomatoes
DOI:   10.17660/ActaHortic.1999.487.67
Abstract:
The productivity of processing tomatoes used for pastes, purees, and sauces is a function of the harvestable yield and the total solids content. High solids content is positively correlated with processed product yield and negatively correlated with dehydration energy costs. As a consequence, there is a tremendous economic benefit to be gained by genetically increasing the soluble solids content (SSC) in new cultivars (e.g., ~70–80 million dollars/year in the USA alone for a 1% increase in solids). A nondestructive method for measuring the soluble solids content of individual processing tomato fruit was developed using near infrared (NTR) spectrometry. A diode array fiber optic spectrometer was used to measure NIR diffuse transmittance. Each fruit was scanned at two locations on opposite sides midway along the proximal-distal axis. After scanning, each fruit was processed, pureed and the SSC was determined using a refractometer. A neutral network (NN) calibration model was developed using the second derivatives of averaged spectra from 780–980 nm. The NN calibration had a capability to estimate the processed SSC of individual unprocessed tomato fruit with a standard error of prediction of 0.52% and could classify greater than 72% of fruits in an independent population within +/-0.5% of SSC. The method can be used to facilitate the speed and accuracy of progeny screening for SSC in tomato breeding programs.

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