壳聚糖保鲜剂涂膜对保鲜葡萄的效果研究

研究了壳聚糖保鲜剂涂膜保鲜葡萄。采用壳聚糖为成膜主剂,表面活性剂为助剂,测定了添加不同表面活性剂的壳聚糖溶液的吸光度和涂布效果。在此基础上,添加不同金属离子的壳聚糖复合保鲜液对葡萄进行了涂膜保鲜处理,并测定了葡萄在贮藏过程中失重率、褐变指数、VC含量和总酸度等生理指标的变化。结果表明：在1%的壳聚糖溶液中添加2%吐温-20、Ca2＋或Cu2＋对葡萄的保鲜效果较好,能有效降低葡萄的失重率,延缓葡萄中总酸度的变化。添加了Ca2＋和Cu2＋的壳聚糖保鲜液对葡萄有较明显的保鲜效果。

Study on fresh-keeping treatment of grape by chitosan

The method of fresh keeping treatment of grape by chitosan was studied.Chitosan was used for the main agent and surfactant as additives to produce fresh keeping film,and determined the absorbance and coating effects of chitosan solution added different surfactants.In addtion,chitosan solution was used to add different metal ions to smear grape.The fresh-keeping effects were compared by determined its physiological changes in weight loss,browning index,vitamin C content and total acidity.Results showed that added Tween-20 and Calcium or Copper ions had better fresh keeping effects.The rate of weight loss and rotten fruit were reduced,the declining rate of total acid content,VC content were delayed.Chitosan added surfactant and Calcium or Copper ions had better fresh keeping effects。