微波与真空冷冻组合干燥加工佛手的工艺研究

Research on Processing Bergamot by Microwave Combined with Vacuum Freeze-Drying

[目的]探讨微波-真空冷冻组合干燥方式对佛手片加工的影响。[方法]以真空冷冻干燥总时间和成品复水率为主要指标,采用微波-真空冷冻组合干燥方式加工佛手片,并采用L9(33)正交试验优化工艺参数;同时,以成品VC含量和精油含量为指标,对比不同干燥方法对佛手片品质的影响。[结果]相比单一的真空冷冻干燥,微波-真空冷冻组合干燥方法可明显缩短冻干总时间和提高成品复水率,该组合干燥的最优工艺参数为微波功率560 W,微波干燥时间2.5 min,物料厚度7 mm,此条件下的冻干总时间为9.8 h。[结论]微波-真空冷冻组合干燥相比微波干燥和真空冷冻干燥更能保证产品品质。

[Objective] To explore the effects of combined drying methods on processing of bergamot slices.[Method] Taking vacuum freeze-drying time and rehydration rate as main indexes,processing bergamot slices by drying method of microwave combined with vacuum freeze-drying and optimum of parameters through L9（33） orthogonal experiments was studied;meanwhile,taking VC content and essential oil content of bergamot product as indexes,the effect of quality by different drying methods was explored in this paper.[Results] Compared with vacuum freeze-drying,combined drying method can shorten freeze-drying time and improve rehydration rate significantly,under conditions of microwave 560 W,microwave processing time 2.5 min and material thickness 7 mm,the whole freeze-drying time is 9.8 h.[Conclusion] Combined drying method can improve products qualities better than microwave drying and vacuum freeze-drying.