Abstract:

Using Jinsha pomelo as the experimental material and no bagging as the control, different light transmittance paper bags were used for bagging treatment of 80 days after blooming, the development status of oil cells and changes in volatile component content in mature fruit peels after bagging were analyzed at different developmental time. The results showed that there was no significant change in the morphology, structure, and diameter of oil cells after bagging, but the types and relative content of volatile substances changed. There were 44, 45, and 44 volatile compounds detected in non bagged, single-layer white paper bags, and double-layer red and black paper bags, respectively, all of which were mainly terpenes with relative contents ranging from 75.77% to 80.58%. The types of terpenes in the two bagging treatments were less than those in the non bagging treatment. There were a total of 11 types of terpenes in the three treatments, with D-limonene having the highest relative content. However, the double-layer paper bag treatment had higher levels of D-limonene than the non bagging and single-layer paper bag treatments; The types and relative contents of alcohol substances in the two bagging treatments were higher than those in the non bagging treatment, and the three were mainly composed of nerol and geraniol; All three treatments contained two detected aldehydes, with citral as the main component, with single-layer paper bags having the highest relative content; The relative content of ketones was inversely proportional to the light intensity. Gingerol was the main ingredient without bagging, and naringin was the main ingredient in single-layer and double-layer paper bags; The relative content of acetate geranyl ester is the highest in esters of three treatments, and there was little difference among all treatments; Only trace amounts of isocyanate epoxide were detected in single-layer paper bag treatment.

Key words: Jinsha pomelo, bagging, oil cell, volatile substance