ISHS Acta Horticulturae 734: VIII International Symposium on Plum and Prune Genetics, Breeding and Pomology
RAPID ANALYTICAL TECHNIQUES FOR MEASUREMENT OF PLUM RIPENESS POSTHARVEST |
| Authors: | G.B. Bengtsson, F. Lundby, J.-E. Haugen |
| Keywords: | Prunus domestica, multivariate statistics, firmness, laser vibrometer, ISFET, soluble solids, titratable acidity, electronic tongue, NIR, interactance spectroscopy |
| DOI: | 10.17660/ActaHortic.2007.734.26 |
| Abstract:
The feasibility of three new techniques for rapid quality related analyses of plums has been explored: vibration response, a multi-parameter electrode system (“electronic tongue”) and a Vis-NIR interactance probe. Multivariate statistical methods for signal processing are important for all techniques. Vibration response in the interval 1-1600 Hz was investigated on plums attached to a vibration table with a non-contact laser vibrometer as a detector. Postharvest storage time and plum size (weight, length, width) correlated significantly (r > 0.9) with the response at various selected vibration frequencies. A commercial multi-parameter liquid sensor system based on ISFET technology was tested on juice from single plums. The electrode measured pH, temperature, conductivity, salinity, total dissolved solids (inorganic), redox potential and relative potential. There was a significant correlation between electrode signals and titratable acidity (r = 0.89), and the ratios soluble solids/titratable acidity (r = 0.81) and total sugars/titratable acidity (r = 0.78). Test with the Vis-NIR interactance probe showed the possibility to develop a non-destructive method for simultaneous analysis of pigmentation and other internal properties of single plums. | |
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