피톤치드패드와 유황패드를 사용한 포도저장 시 품질특성 연구

Abstract

In order to study the shelf life of grapes, appearance, weight loss, shattering rate, pH, titratable acidity, sugar content, color, free sugar, organic acid, and ethanol contents of grapes grown in were measured for 12 days of storage at room temperature by treatments with phytoncide pads derived from pine tree (phytoncide pad 1 and phytoncide pad 2) and a sulfur dioxide pad as well as a control group with pad only. As the storage period increased, the color of the sulfur dioxide pad changed to red. The weight reduction rate significantly increased by the sulfur dioxide pad treatment and the lowest weight reduction rate was obtained by the phytoncide 2 treatment. The percentage of the highest shattering rate was determined on the 12th day of storage in the control. Moreover, the sulfur dioxide pad treatment was carried out at the lowest pH, and the phytoncide 2 treatment at the highest pH. Titratable acidity increased until the 6th day of storage, but decreased at the 12th day for both treatments. The sugar content decreased with increasing storage period, and the control group showed the highest decrease with 13.13-13.50 °Brix on the 12th storage day. The L and a value were increased in the sulfur dioxide pad treatment, and the b value increased in all treatments except the phytoncide pad 2 treatment at the 12th day of storage. Fructose content was 56,805.88-67,157.12 mg/L on the 12th day of storage. In the phytoncide pad 1 treatment, it showed a low decrease in fructose content during the storage period. A similar decrease in the content of tartaric acid, which is the highest content in the organic acids of grapes, was observed in all treatments except in the control. The lowest increase in ethanol content was observed in the phytoncide pad 2 treatment during the storage period. Therefore, grapes were better preserved by the phytoncide pad 2 treatment at room temperature than that by using conventional sulfite pads.