荔枝包装与其果皮花色素苷的光稳定性研究

Research on Litchi Package and Light Stability of Litchi Pericarp Anthocyanidin Glucoside

用 6种不同颜色的 PE袋 (黑色、蓝色、红色、绿色、黄色、白色 )包装荔枝果皮的甲醇— HCl提取液 (p H=3.0 0± 0 .0 1) ,研究了经自然光 (阳光 )照射后的吸收光谱 (190 .0 0 nm～ 110 0 .0 nm)变化。发现白色 PE袋不能有效地阻止荔枝果皮色素的光分解作用 ,而黑色 PE袋、蓝色 PE袋和红色 PE袋可提高荔枝果皮色素的光稳定性。这一研究结果 ,进一步说明了光照对荔枝褐变的影响 。

The study on the absorption spectrum changes of carbinol extraction (pH=3 00±0 01) of litchi pericarp against the natural light within PE bags of different colours (black, blue, green, yellow and white) was made. The findings are that the white PE bags cannot prevent effectively the photolysis of anthocyanidin glucoside of litchi pericarp, but the black, blue, or red PE bags can improve its light stability. This does not only confirm natural lighting effect on litchi browning, but also provides theoretical basis for improving litchi packing bags.