Quality changes of pear during shelf-life

Abstract

Abstract. The aims of our research work were the investigation of postharvest changes of pear samples (Pyrus communis cv. Bosc kobak) during combined cold storage and shelf-life (storage at room temperature), the determination of quality changes by mainly non-destructive methods, the modeling of the changes of the non-destructive parameters (acoustic, impact stiffness coefficient, chlorophyll fluorescence parameters [Fv/Fm, Fm/F0]), and multivariate statistical analysis of the measured and predicted data based on the data of the non-destructive texture analysis (acoustic and impact methods), chlorophyll fluorescence analysis and laser scattering measurement. Storage Time Equivalent Value (STEV) was calculated and introduced based on mass-loss analysis. The changes of the non-destructive parameters were analyzed vs. this virtual storage time (STEV). The changes of acoustic, impact stiffness coefficient and chlorophyll fluorescence parameters can be predicted by exponential function. The predicted time constants of the parameters were 21.0, 45.8, 47.1, 83.4, acoustic, impact stiffness coefficient, Fm/F0, Fv/Fm, respectively. The lower the time constant, the quicker is the change of the given parameter during storage, the higher is its sensitivity. By this point of view, the percentage mass loss related sensitivity to the characterization of textural changes, the predicted acoustic stiffness coefficient was found to be more sensitive than the impact stiffness coefficient. The Fm/F0 value characterized more sensibly the changes of the chlorophyll fluorescence than in the literature commonly used Fv/Fm. The non-contact laser scattering method based significant PLS models were constructed to predict the quality related pear characteristics (mechanical properties, chlorophyll fluorescence parameters).

Postharvest quality and safety of fresh-cut melon fruits coated with water soluble chitosan films

“…The differences were presented in elasticity modulus, brix, acidity and sugar/acid ratio. These results are in accordance with the results of other authors above for quality parameters (Aday & Caner, 2010, Baldwin et al, 2011, Martinez-Romero et al, 2006, Poverenov, 2014, Zsom et al, 2016…”

Effect of 1-MCP, ethylene absorber and ozone on melon quality during storage

“…The decrease of acoustic firmness indicated that the mechanical texture of samples changed and the softening took place throughout storage. This was in agreement with earlier reports (Zsom-Muha & Felföldi, 2007;Zsom et al, 2016). According to these differences, there were two distinct groups: 1-MCP treated samples retained firmness more than control, EA or ozone treated (Fig.…”

Nondestructive detection of low temperature induced stress on postharvest quality of kápia type sweet pepper

“…Furthermore, non-destructive texture evaluation was carried out by a purpose-built tabletop acoustic texture measuring system (Zsom et al, 2016;Zsom-Muha and Felf€ oldi, 2007). Samples were positioned vertically their tips facing upwards individually on a soft cushioning sample holder.…”

“…Nowadays, among the potential quality determination methods mainly optical techniques are applied. According to the already published papers (Baranyai et al, 2020;Cen et al, 2016;Gorbe & Calatayud, 2012;Kaszab et al, 2008;Pinto et al, 2015;Ziosi et al, 2008;Zsom et al, 2016Zsom et al, , 2018 the measurement of chlorophyll content related absorbance differences, chlorophyll fluorescence characteristics, machine vision and hyperspectral imaging systems could be used as non-destructive approaches for the evaluation of quality changes of perishable horticultural produces.…”