壳聚糖对红枣汁澄清效果的影响

Effects of Chitosan on Clarification Effects of Zizyphus jujube Mill Juice

[目的]探讨壳聚糖澄清红枣汁的最优工艺条件。[方法]以红枣汁为原料,在单因素试验的基础上,采用正交试验优化壳聚糖澄清红枣汁的工艺条件。以红枣汁澄清度为指标,重点探讨了壳聚糖浓度、澄清温度及澄清时间等工艺参数对红枣汁澄清效果的影响。[结果]试验表明,壳聚糖澄清红枣汁的最佳工艺条件为:壳聚糖用量0.7 g/L,温度35℃,澄清时间1.5 h,澄清后的红枣汁透光率可达89%,与原汁相比,其总糖、总酸、可溶性固形物含量和p H变化不大,果胶含量去除80%以上。[结论]壳聚糖澄清效果好,经济实用,可用于红枣澄清汁的生产。

[Objective] To discuss the optimal technology of clarified Zizyphus jujube Mill juice after chitosan treatment. [Method] With Z. jujube juice as the materials,single factor test was carried out. The clarification technology of Z. jujube juice by chitosan was optimized by orthogonal test. With the clarity of Z. jujube juice as the index,we mainly discussed the effects of chitosan concentration,clarification time and clarification temperature on the clarification effects of Z. jujube juice were discussed. [Result] The optimal technology was as follows：0. 7 g / L chitosan dosage,35 ℃ clarification temperature,and 1. 5 h clarification time. Under this condition,the transmittance of Z. jujube juice after clarification reached 89%. Compared with the original juice,there were slight changes in p H,total glucose content,total acid and soluble solid. The pectin content was removed by more than 80%. [Conclusion]Chitosan has relatively good clarification effects. This method is economical and practical,and can be used for the production of Z. jujube juice.