A Bio-Electrochemical Calculation Model for Color Decline Kinetics of Bruised Shine Muscat Fruit During Storage

Physical damage of fruits and vegetables during distribution accelerate their decline in quality during storage. This study was aimed to analyze the quality degradation that takes injuries into consideration by using estimation models. Estimation models for bruised Shine Muscat grapes during storage were investigated based on bio-electrochemical theory. An electrical indicator, LTO, defined as the length from the origin of the coordinate at the top of the circular arc of the Cole-Cole plot, was demonstrated to effectively quantify the degree of a bruise with high accuracy (r(2) > 99). The color-change kinetics constant increased as LTO decreased, and a strong correlation was confirmed between these two parameters (p < 0.01). These results demonstrate that the LTO parameter can be used to characterize physical damage incurred by the fruit, and it may be used as an injury parameter to calculate their color-change kinetics constant during storage after physical damage.