多次间歇LED光照射对铁观音风味组分的影响  

Influence of multi intermittence radiation by LED on flavor components in Tieguanyin tea

作　　者：陈寿松[1] 金心怡[1,2] 游芳宁 周子维 李鑫磊 郝志龙[1,2] 孙云[1,2] 

机构地区：[1]福建农林大学园艺学院,福州350002 [2]茶学福建省高校重点实验室,福州350002

出　　处：《农业工程学报》2018年第2期308-314,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金："十二五"科技支撑计划项目(2014BAD06B06-06);国家现代农业(茶叶)产业技术体系建设专项资金项目(CARS-19);国家重大农技推广服务试点项目(KNJ-151063);福建省现代农业茶产业体系建设项目(NYT2017001)

摘　　要：光照是决定乌龙茶高香醇厚品质的重要因子。为了探究多次间歇LED光照射对铁观音品质的影响,该文以铁观音为研究对象,采用LED白光进行多次光照射处理试验,以全程无光照为对照(CK),通过设计3个不同次数LED光照射试验组,第1次摇青前进行第1次光照射为(S-1),第2次摇青前进行第2次光照射为(S-2),第3次摇青前进行第3次光照射为(S-3),分别进行不同处理的铁观音毛茶的儿茶素、氨基酸、香气组分测定以及感官品质审评。试验结果表明:与CK相比,S-2和S-3处理铁观音毛茶中的呈苦涩味儿茶素组分总量分别降低了29.6%、24.4%,游离氨基酸组分总量分别提高了20.5%、15.4%,毛茶酚氨比减小;适度增加LED光照射次数有利于铁观音毛茶呈花果香气味的α-法呢烯和橙花叔醇相对含量的积累,其中S-2处理效果最佳,相对于CK分别提高了56.28%、62.51%;基于香气主成分分析得出S-2处理的香气综合评价得分最高(9.88),CK得分最低(-3.48),与4个不同处理的铁观音毛茶感官审评结果排序相同。研究结果可为将来开展建设乌龙茶全天候工厂化连续化加工生产提供理论和科学参考。Light is an important factor,which decides joyful aroma and mellow taste in Oolong tea.Solar withering is the first and essential process,and a large number of primary and secondary metabolites are induced and regulated under several minutes of radiation during Oolong tea manufacturing.However,rainy days usually take place in fastigium production period,and thus quality of Oolong tea has no fruit floral odor and taste is niffy.In recent years,many scholars selected LED（light emitting diode） as an artificial light source to improve quality of special tea.In order to explore the influence of multi intermittence radiation radiation with different times by LED on quality in Oolong tea,in this study,Tieguanyin was taken as research material,and dark treatment（CK） was used as control.Meanwhile,3 treatments were performed by white LED,one time radiation（S-1）,which was conducted before the first assignment in turning over process,the other two treatments（S-2,S-3） were designed by adding radiation for 1 time and 2 times before the second and third assignment in turning over process,respectively.The parameters of environment were set as follows：Photosynthetically active radiation（PAR） was set as（400±10） μmol/（m2·s）,duration of illumination was set as 30 min for each time,temperature was set as 25 ℃,relative humidity was set as 60%,and thickness of leaves was set as 10 mm.Then,4 samples of primary tea were made following technological process of fen-flavor Tieguanyin,and were frozen in refrigerator at-20 ℃.Catechins,amino acids,aroma and sensory evaluation in Tieguanyin primary tea were performed for all samples by UPLC-Qq Q-MS and HS-SPME-GC-MS.Firstly,the multi intermittence radiation device by LED in Oolong tea was developed by ourselves.The device mainly included LED panel,heat pump,rocking device,transfer platform,ventilating slot,superior lobe device,and transmission mechanism.Several set devices would perform cycle operation of different times in light radiation and turning over p

关 键 词：照射 主成分分析 试验 铁观音 LED 多次间歇 香气组分 品质 

分 类 号：S571.1[农业科学—茶叶生产加工]