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Petrisor C.,Research and Development Station for Pomiculture Baneasa | Radu G.L.,Polytechnic University of Bucharest | Cimpeanu G.,University of Bucharest
Revista de Chimie | Year: 2010

In this paper spectrometry in reflectance was utilized to determine parameter of apricot fruits color during different stages of ripening. Texture analysis with an acoustic impulse response technique and ethylene quantification by chromatography were carrying out. Also we discussed relationship between parameter of color, texture, ethylene concentration and other quality parameters to establish feasibility of methods developed to characterize the final quality of fruits. Fruits of two Romanian apricot varieties (Dacia and Nicusor) harvested at different ripening stages were used in this study. Among chromatic parmeters CIELAB, az.ast; and h values are indicators to distinguish of different maturity stage of apricot fruit and for prediction of their pigments content. Acoustic impulse response gave a realiable indication of the change in texture properties of apricot fruit during ripening. The physiological criteria could be used as markers for monitoring of fruit ripening but the technique is difficult and can not be used outside the laboratory.

Petrisor C.,Research and Development Station for Pomiculture Baneasa | Radu G.L.,Polytechnic University of Bucharest | Balan V.,University of Bucharest | Campeanu G.,University of Bucharest
Romanian Biotechnological Letters | Year: 2010

Quality of ripened apricot depends on its maturity at harvest which was determined in the past subjectively and based on visual ratings. In this paper we have explored the feasibility of two novel techniques for rapid quality measurement of apricot and determination of optimal harvest date: acoustic impulse response technique for firmness and reflectance spectroscopy for fruit color. The rectangular color parameters L*, a*, b* of freshly harvested apricots ranging from immature to over mature were measured using HunterLab Mini Scan XE Plus spectrophotometer. Acoustic response measurements using an AWETA Acoustic Firmness Sensor gave a reliable indication of the change in mechanical properties of fruit during maturation. Our results suggested that acoustic firmness index could be used to distinguish between different maturity stages of apricot fruit. Among color parameters CIELAB, a* and h° value are feasible indicators for distinguishing different maturity stage. © 2010 University of Bucharest.

Petrisor C.,Research and Development Station for Pomiculture Baneasa | Radu G.-L.,Polytechnic University of Bucharest | Balan V.,University of Bucharest | Campeanu G.,University of Bucharest
UPB Scientific Bulletin, Series B: Chemistry and Materials Science | Year: 2010

Fruit visual appearance is one of the first quality determinants, and encouraging consumers to buy them. Often the fruit appearance, especially color, is the most critical factor in the initial sale. In the past, the evaluation of apricot color has been subjective and based on visual ratings. The present paper illustrates the use of colorimetric tristimulus system CIELAB and CIELCH to objectively quantify and characterize fruit color and quality. To this aim, fruits of two new apricot cultivars with extra-early maturation (Rares and Valeria) have been analyzed for color, but also for pigments content, acidity and soluble solids. The lightness value (L*) of apricot cultivars studied do not varied significantly during the fruit maturation. The a* and b* values significantly increased and the h° value progressively decreased with fruit ripening, having similar values for both cultivars. Among the chromatic CIELAB parameters studied the* and h° represent feasible indicators, both for quantifying fruit color and for distinguishing different maturity stages of the apricot fruit. One can conclude that the determination of chromatic attributes, as well as the plot of these, makes it possible to identify the different maturation phases, fact that should be of interest to breeders and growers in order to quantify the ripening and quality of fruit.

Petrisor C.,Research and Development Station for Pomiculture Baneasa | Barbulescu A.,Research and Development Station for Pomiculture Baneasa | Campeanu G.,University of Bucharest | Balan V.,University of Bucharest
Acta Horticulturae | Year: 2012

PPV virus determines severe damage on stone fruit species all over Europa. This virus determined some change of leaf color from light green to green-yellow. Therefore, pigments and photosynthetic activity of tree are affected by infection process. The aim of this paper was quantitative evaluation of leaf decolorization determined by virus, using physiological parameters (photosynthesis and respiration), chlorophylls and carotenoids pigments, chromatic parameters and reflectance spectra. We quantified all these parameters on PPV infected and healthy peach and apricot cultivars previously ELISA checked. We highlighted photosynthesis weaker and higher respiration intensity and also a lower content of chlorophylls at infected compared to healthy cultivars. The results obtained evidence that it is possible to use L*, b* and h° parameters and reflectance spectra for diagnostics of physiological state to differentiate between healthy and infected cultivars.

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