五种套袋对早熟梨果实糖酸和毒死蜱农药残留的影响

为探讨早熟梨套袋对果实糖酸含量及毒死蜱农药残留的影响,以早熟梨苏翠1号作为研究试材,选择5种纸袋分别进行套袋,采用高效液相色谱和气相色谱分析比较了糖酸组分含量、果实毒死蜱农药残留的差异。结果表明,套袋果实的光洁度及亮度明显提高,以黄白袋HB和复合黑蜡袋FL处理较高,对果实大小、果形指数没有显著影响;果实的山梨醇含量并没有表现出显著差异,蔗糖、葡萄糖、果糖含量明显降低。黄白袋HB的总糖含量相对较高,较HB对照的低6.36%。5种纸袋对果实苹果酸、奎尼酸、总酸的影响较大,而对柠檬酸含量的影响并不大。与对照相比,黄白袋HB、复合黑蜡袋FL的处理果实毒死蜱残留量低37.37%、55.55%。其中,复合黑蜡袋FL与黄白袋HB相比,果实毒死蜱残留量低29.03%,套三层纸袋的果实毒死蜱残留量降低程度好于双层袋。

Effects of 5 bagging treatments on sugar and acid content and chlorpyrifos pesticide residues in early maturing pears

In order to investigate the effects of 5 bagging treatments on fruit quality, sugar and acid content, and chlorpyrifos pesticide residues in early maturing pears, the pear variety Sucui No. 1 was used as material. Liquid chromatography and gas chromatography were used to analyze the content of sugar and acid chlorpyrifos pesticide residues. The results showed that the smoothness and brightness of bagging fruits were significantly improved, and the treatments in yellow white bag (HB) and black wax composite bag (FL) had no significant effect on fruit size and fruit shape index. The content of sorbitol in fruits had no significant difference, while the content of sucrose, glucose and fructose decreased significantly. The total sugar content of HB was relatively high. Compared with the control, the total sugar content of HB treatment was decreased by 6.36%. The effects of 5 kinds of bags on malic acid, quinidine acid and total acid were greater, but not on citric acid content. Compared with the control, chlorpyrifos residues in fruits treated with HB and FL were decreased by 37.37% and 55.55%, respectively. Among them, the content of chlorpyrifos residue in FL decreased by 29.03%, compared with HB. The effect of reducing chlorpyrifos residue in three layer paper bags was better than that in double layer bag.