|Authors: ||K.H.S. Peiris, G.G. Dull, R.G. Leffler, S.J. Kays|
|Keywords: ||Nondestructive quality evaluation, internal quality, NIR, processing tomatoes|
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.
Download Adobe Acrobat Reader (free software to read PDF files)
URL www.actahort.org Hosted by KU Leuven