【摘要】 为确定适宜铁棍山药的干燥技术，采用气体射流冲击干燥（Air impingement drying,AID）、微波联合热风干燥（Microwave combined with hot air drying, MW-HAD）、红外联合热泵干燥（Infrared combined heat pump drying, IR-HPD）、热风干燥（Hot air drying, HAD）、真空冷冻干燥（Vacuum freeze drying, VFD）5种干燥方式处理山药片，测定其干燥时间、灰分、明亮度、复水比、浸出物含量、尿囊素含量和薯蓣皂苷元含量指标，并采用熵权-TOPSIS法进行综合评价。结果表明：AID组干燥时间最短为130 min，其水分有效扩散系数最大为7.13×10^–8 m²/s;MWHAD干燥速率呈现先升高后降低的趋势；VFD组明亮度L^*值最高达到95.73，其次为AID组；不同干燥方式下山药片复水比差异显著（P<0.05）,VFD和AID组复水性最好；VFD组山药片浸出物含量最高为5.91%，其次是AID组为5.88%;5种干燥方式下尿囊素含量和薯蓣皂苷元含量差异不显著（P>0.05）。熵权-TOPSIS法综合评价值排序由大到小依次为AID>VFD>HAD>IR-HPD>MW-HAD，可选用AID作为山药片的首选干燥方式。更多还原

【Abstract】 In order to select the suitable drying technology for the slices of iron stick yam,five drying technologies were used to dry yam slice,including air impingement drying（AID）,microwave combined with hot air drying（MW-HAD）,infrared combined heat pump drying（IR-HPD）,hot air drying（HAD） and vacuum freeze drying（VFD）.In this experiment,drying time,ash,brightness,rehydration ratio,extract content,allantoin content and diosgenin content were determined and the entropy weight-TOPSIS method was used for comprehensive evaluation.The results showed that the shortest AID time was 130 min,and its maximum effective water diffusion coefficient was 7.13×10^-8 m²/s.The MW-HAD drying rate showed a trend of increasing first and then decreasing.The VFD group brightness L^* value reached 95.73,followed by AID group.There was significant difference in rehydration ratio among different drying methods（P<0.05）,VFD and AID groups had the best rehydration.The extract content of yam tablets in VFD group was the highest（5.91%）,followed by AID group（5.88%）.There was no significant difference in allantoin and diosgenin contents under five drying methods（P>0.05）.The comprehensive evaluation ranking of entropy weightTOPSIS method was AID>VFD>HAD>IR-HPD>MW-HAD.AID could be chosen as the preferred drying method for yam slices.更多还原