Aroma changes of black tea prepared from methyl jasmonate treated tea plants

研究目的：为茉莉酸甲酯诱导来提高茶叶香气品质提供理论依据,为新型花香红茶的研制提供技术支持。创新要点：首次将茉莉酸甲酯应用于诱导茶叶香气品质提高,初步验证了茶叶香气品质提高的本质原因：相关酶活性提高,基因表达上调。研究方法：采用顶空固相微萃取法（HS-SPME）对红茶香气进行富集,气相色谱-质谱联用仪（GC-MS）进行解吸附分析,实时定量多聚酶链式反应（qRT-PCR）分析茶鲜叶中香气相关酶基因表达。重要结论：茉莉酸甲酯诱导后的茶鲜叶中多酚氧化酶（PPO）活性上升,β-葡萄糖苷酶活性下降;PPO和β-樱草糖苷酶基因表达上调,β-葡萄糖苷酶基因表达下调。茉莉酸甲酯诱导后的茶鲜叶能明显提高由其制成的红茶香气品质,且萜烯醇类和萜烯类含量明显提高。     

徽州古戏台聚福堂建筑形制分析

由现存的11座徽州古戏台共同构成的"祁门古戏台群"为全国重点文物保护单位,聚福堂就是其中重要的组成部分。聚福堂古戏台继承了祁门古戏台"祠内戏台"的典型建筑布局形式,属于活动式戏台,其在建筑形制上更是继承了徽派建筑形制特点。由聚福堂古戏台建筑布局形式入手,分析了古戏台的建筑形制特点及其典型价值特征,探讨了徽州古戏台的保护思路。     

七色镜

花茶 用鲜花伴制的一种茶。一般是用绿茶做茶坯,分茉莉花茶、桂花茶等品种。     

博览平台

Time Ball时间球In the United states,people dropa time ball for the New Year.The most famous ball drop is in Times Square(时报广场),New York.在     

健康新知

喝红茶预防帕金森病;巧克力导致骨质疏松;     

使用与功能——皖南目连戏的变与不变——以祁门两个村落为例

目连戏被称为“戏曲活化石”,具有极高的艺术价值和研究价值。皖南地区的目连戏带有强烈的地方宗族色彩,具有浓厚的皖南地方特色。封建社会里,皖南目连戏因其对于宗族的特殊功能而被广为使用;当前,这古老戏曲却由于种种原因衰落了,人们不再使用它。但是,皖南目连戏因其具有一定的社会功能而并没有失去使用价值,应给予充分的重视,对其进行有效的保护。     

知心红茶坊

Q：模考的成绩不理想,我从年级前列退了下来,同学们好像都在用异样的跟光看我,我的心里有种说不出的滋味儿,坐在教室里感到很压抑。下次考试我就要坐到第二梯队的考场里去了,想起来心里就很别扭,高中三年我还从来没有离开过第一考场呢,我该怎么面对啊？     

浅析宁红茶的盛衰

宁红茶是我国茶叶中的珍品,主要产于修水、武宁、铜鼓三县。长期以来,在国内外市场上享有很高的声誉。十九世纪中叶,宁红茶发展达到鼎盛时期,民国以后不断衰弱。到解放后又逐渐恢复和发展。回顾这个历程,剖析其原因,对当前宁红茶的发展大有益处。     

Gas chromatographic method for the determination of hexaconazole residues in black tea

A highly reliable, quantitative and sensitive analytical method for determining the residues of the fungicide, hexaconazole in black tea is described. The proposed method is based on liquid-liquid extraction followed by gas chromatographic determination, using nitrogen phosphorus detector (GC-NPD) for the identification and quantitation of hexaconazole. The most was cleaned up by adsorption column chromatography using activated florisil. Performance of the method was assessed by evaluating quality parameters such as recovery value, repeatability, reproducibility, linearity and limits of detection and quantitation. When the method was assessed for repeatability, the percentage of recovery ranged between 86% and 96% while the relative standard deviation was between 0.30% and 2.35%. In studies on reproducibility the recovery ranged from 81% to 85% and relative standard deviation from 1.68% to 5.13%, implying that the method was reliable. A field trial was conducted to verify the application of this method with real samples. Results prove that the validated method was suitable for extracting hexaconazole residues.