Articles
NON DESTRUCTIVE VISIBLE AND NIR SPECTROSCOPY MEASUREMENT FOR THE DETERMINATION OF APPLE INTERNAL QUALITY
Article number
517_56
Pages
441 – 448
Language
Abstract
A non destructive automatic near infrared sensor would be greatly appreciated among package storage houses and great store market for grading apple according to their taste quality.
For this purpose, a NIR spectrometer DA 7000 (Perten), a polychromatic spectrometer fitted with InGaAS diode array detectors has been tested.
The measurement time and prediction only take 1 second and could even be lowered with the Perten on line software.
The non destructive reflectance spectra are taken in the four equidistant locations along the equator on the whole apples.
A modified partial least square regression method based on the NIR spectra (math treatment 2,4,4,1) and lab values, gave good results.
Determination coefficients and standard errors of prediction for 300 apples were respectively : 0.86–0.45 for brix, 0.88 – 1.33 ml of NaOH 0.1N for titrable acidity, 0.86 – 0.56% for dry matter, 0.78 – 0.10 for pH, 0.64 – 0.74 kg/cm2 for firmness.
A high correlation between the second derivative of spectra and diameter was also found : 0.87 – 0.17 cm.
For this purpose, a NIR spectrometer DA 7000 (Perten), a polychromatic spectrometer fitted with InGaAS diode array detectors has been tested.
The measurement time and prediction only take 1 second and could even be lowered with the Perten on line software.
The non destructive reflectance spectra are taken in the four equidistant locations along the equator on the whole apples.
A modified partial least square regression method based on the NIR spectra (math treatment 2,4,4,1) and lab values, gave good results.
Determination coefficients and standard errors of prediction for 300 apples were respectively : 0.86–0.45 for brix, 0.88 – 1.33 ml of NaOH 0.1N for titrable acidity, 0.86 – 0.56% for dry matter, 0.78 – 0.10 for pH, 0.64 – 0.74 kg/cm2 for firmness.
A high correlation between the second derivative of spectra and diameter was also found : 0.87 – 0.17 cm.
Authors
E. Moons, G. Sinnaeve, P. Dardenne
Keywords
acidity, apple grading, Brix, diode array, near infrared, non destructive quality control
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