Effects Of Different Drying Methods On Quality And Volatile Components Of Capsella Bursa-Pastoris L

Optimization system of SPME-GC-MS using to analysis volatile components of Capsella bursa-pastoris and effects of different drying methods on quality and volatile components were investigated. The main results were as follows:1. SPME-GC-MS was used to analysis volatile components of Capsella bursa-pastoris and the extraction conditions were investigated. Experimental results showed that the optimal SPME extraction time and temperature were 40min and 50℃ while the desorption time and temperature were 3min and 250℃ by using DVB/CAR/P-DMS fiber. A total of 64 volatile components were identified mainly of which were aldehydes, alcohols, hydrocarbons and other compounds including sulfide and heter-ocycle. The characteristic volatile components of Capsella bursa-pastoris were disul-fide, dimethyl; Hexanal; 3-Hexen-1-ol; 2-Hexenal, (E)-; Dimethyl trisulfide; Cyclohe-xanol,2,6-dimethy1-; 3-Buten-2-one,4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-and so on.2. The basic quality indicators and volatile components of Capsella bursa-pastoris at different drying methods which included hot-air drying(40℃-90℃), microwave drying(120W-700W), vacuum drying(50℃-90℃, vacuum degree:0.1 MPa) and freeze drying(5℃-20℃, pre-freeze temperature:-20℃, pre-freeze time:6h, hydrazine freezing temperature:-85℃, vacuum degree:0.5MPa) were analyzed. The results showed that Capsella bursa-pastoris processed by 60℃ hot-air drying,480W microwave drying,80℃ vacuum drying and 10℃ freeze drying had obvious advantages at drying time, sensory quality, nutritional characteristics, rehydration capacity and retention rate of volatile components compared with other technological products. The optimized parameters were as follows:60℃ hot-air drying 160min,480W microwave drying 21min,80℃ vacuum drying 140min and 10℃ freeze drying 840min, in which vacuum drying and freeze drying had a better result.