A naked-eye detective chemosensor have received much attention in a variety of application fields due to the simplicity, favorable performance, selectivity, and low cost. In especial, chemosensor supplies consumers with communication as a marketing tool and an offer to consumer with the great easy of use and time-saving convenience for the final purchasing decision.<br/>Apple is one of the representative climacteric fruits, emitting the characteristic aroma including the variety of volatile organic materials, such as aldehyde, acetate and alcohol etc during the storage. To fabricate an aroma sensitive colorimetric indicator (ACI), Methyl red was dissolved in methanol (1.2 mM) and adsorbed on the papers. The colorimetric response of ACIs and the apple quality were investigated with the variation of a storage time. ACIs and apples were simultaneously inserted in a storage chamber (14 L). As increasing the storage time from 0 day to 15 days, the color of ACI was changed from yellow to red. The color change profile of ACI was analyzed by the RGB value. In order to investigate the quality of apple, components analysis and sensory test consisted of 5 investigation items (appearance, sweetness, sourness, crunchiness, and over all acceptance) were conducted with the apples of a different storage period. The characteristic component changes were the diminishment of Phenolics and Flavonoid.<br/>The results of sensory test showed that the favorable quality of apple was sustained in a storage period of the 3 ~ 4 days, which is corresponding to the suitable purchase time. In the storage period of more than 8 days, the apple quality based on the sensory test was drastically deteriorated.<br/>Along with the results of sensory test, ACI was responded to the volatile aroma of apples, resulting in the color change. These results indicate that ACI fabricated by doping Methyl red was applicable to a sensor for the determination of apple quality as well as an aldehyde detective sensor.

Volatile-organic component sensitive colorimetric chemosensor: Application for determination of apple quality

249th National Meeting (2015)

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