变温杀青工艺对野金柴老叶特性和品质的影响  

Effects of Variable-Temperature Fixation on Characteristics and Quality of Aged Leaves of Lithocarpus Pachyphyllus(Kurz)Rehd

作　　者：郑国华[1] 黄虹[2] 涂祖新[1] 李江怀 张莉莉[1] 邓涛 李娅 ZHENG Guohua;HUANG Hong;TU Zuxin;LI Jianghuai;ZHANG Lili;DENG Tao;LI Ya(Institute of Microbiology,Jiangxi Academy of Sciences,330096,Nanchang,PRC;Jiangxi Academy of Agricultural Sciences,330200,Nanchang,PRC)

机构地区：[1]江西省科学院微生物研究所,南昌330096 [2]江西省农业科学院,南昌330200

出　　处：《江西科学》2023年第5期846-853,共8页Jiangxi Science

基　　金：江西省重点研发计划项目(20212BBG73046);江西省科学院包干制重点研发计划(2021YSBG22011)。

摘　　要：为提高野金柴老叶饮品根皮苷的浸出率,省去鲜叶揉捻工序,降低鲜叶干燥能耗,对其进行了干热变温破蜡被杀青干燥工艺的研究;在单因素试验基础上,以鲜叶杀青温度(A)、杀青时长(B)及变温次数(C)作为影响因子,以经过该干燥工艺处理后的干叶沸水冲泡后其根皮苷的释放量(R1)为响应值,通过Design Expert 10软件的响应面Box-Behnken试验设计对上述3因子及其交互作用进行了研究。结果表明,C,B的交互作用对R1影响均达到了极显著水平,A的交互作用不显著。野金柴老叶预处理最佳工艺为:野金柴老叶(鲜叶)杀青破蜡被破细胞温度设定在85℃,杀青时长定在100 min、其间变温3次,即:烘25 min时取出、立即风冷2 min,再放入烘干箱继续加热杀青,在50 min和75 min时又如法“取出—风冷—放回—杀青烘干”操作2次。优化处理后的野金柴老叶干叶沸水冲泡后其根皮苷释放量可达11969 mg/kg,与最高预测值12285 mg/kg比较接近,表明该模型能较好地预测实际处理情况。同时,为大量野金柴老叶(鲜叶)的处理、加工和保藏缩短了所需时间,节省了大量的人工成本,并可使野金柴产品加工生产标准化、产品质量有所保障。This study aimed to improve the extraction rate of Phlorhizin from Lithocarpus polystachyus Rehd tea by optimizing the pretreatment process.A dry-heat variable-temperature wax-breaking fixation and drying process was used to eliminate the twisting process of fresh leaves and reduce energy consumption during drying.The effects of fixation temperature,fixation time,and variable-temperature cycles on the release of Phlorhizin were investigated using Design Expert 10 software Box-Behnken response surface methodology.The optimized pretreatment process for WEU was determined to be fixation and wax-breaking of fresh leaves at 85℃for 100 min with three variable-temperature cycles.The release of aucubin from the dried leaves reached 11969 mg/kg after boiling in water,close to the highest predicted value of 12285 mg/kg.This method saved labor costs,shortened processing,production,and storage time,and ensured product standardization and quality.

关 键 词：野金柴老叶 根皮苷 变温杀青 破蜡被 响应面Box-Behnken设计 

分 类 号：TS201.3[轻工技术与工程—食品科学] TS218[轻工技术与工程—食品科学与工程]