钙基及钠基膨润土涂膜对芒果保鲜效果的研究

Fresh-Keeping Effect of Coating with Calcium Bentonite or Sodium Bentonite on Mango at Ambient Temperature

以桂七芒果为试验材料,用钙基及钠基膨润土进行涂膜处理后在室温下(28～33℃)贮藏,对贮藏过程中发病指数、质量损失率、呼吸强度、可溶糖、可滴定酸、可溶性固形物、细胞膜透性、原果胶等物理、化学及生理指标进行测定。结果表明:经涂膜后可以明显降低芒果发病情况和失水率,抑制呼吸强度、可溶糖和可溶性固形物高峰的出现,降低了可滴定酸的下降程度,延缓了果胶的降解速度,较好的保持了细胞膜的功能活性。钠基膨润土涂膜处理的保鲜效果好于钙基膨润土。

＂Guiqi＂ mangoes were coated with calcium bentonite or sodium bentonite and stored at ambient temperature（28–33 ℃）.Physicochemical and physiological indexes were measured during the storage,including decay index,weight loss rate,respiration intensity,soluble sugar content,titritable acidity,soluble solids,membrane permeability,protopectin and soluble pectin.The results show both calcium bentonite and sodium bentonite could significantly decrease decay index and water loss,restrain the appearance of peak values of respiration intensity,soluble sugar content and soluble solids content,retard the decrease of titritable acidity,slow down the degradation speed of pectin,and maintain cell membrane functionality well.Furthermore,sodium bentonite was more effective in preserving mango than calcium bentonite.