A central composite design(CCD),with three variables and three levels,was used to optimize withering and fermentation processing during manufacture of Congou black tea of Sichuan.The three independent variables were w...A central composite design(CCD),with three variables and three levels,was used to optimize withering and fermentation processing during manufacture of Congou black tea of Sichuan.The three independent variables were withering time,fermentation time and fermentation temperature.Each factor was set by three levels.The responses were predicted by analysis of the regression equation.In the study,the models of regression equation were significant by the analysis of variance(ANOVA).The second-order response surface figures were showed that interaction term is correlated with the response.Optimal process parameters for the maximum of TF and TR formation were obtained at withering time of 12 hours,fermentation time of 2 hours,and fermentation temperature of 30℃.The predictions of TF and TR formation were 0.52% and 3.98%.The results obtained in this study showed that the CCD and Response Surface Methodology(RSM) could be an effective tool to optimize the process parameters of Congou black tea manufacture.展开更多
为了解不同茶树品种制作的芽型工夫红茶品质差异,采用高效液相色谱技术、固相微萃取-气相色谱-质谱联用(SPME-GC-MS)技术、定量描述性分析和化学计量学对10个茶树品种芽型工夫红茶的特征滋味物质和特征香气成分进行分析。定量描述性分...为了解不同茶树品种制作的芽型工夫红茶品质差异,采用高效液相色谱技术、固相微萃取-气相色谱-质谱联用(SPME-GC-MS)技术、定量描述性分析和化学计量学对10个茶树品种芽型工夫红茶的特征滋味物质和特征香气成分进行分析。定量描述性分析结果表明,10个茶树品种芽型工夫红茶的整体香气以甜香、花香为主,滋味以甜醇、浓厚为主。不同样品中检测的16种内含成分(非挥发性成分)存在一定的差异,平均变异系数为21.63%,其中茶黄素的差异最大;在10个茶树品种红茶中共检测出49种挥发性物质,其中质量分数最高的挥发性物质类型为醇类化合物,其次为酯类化合物,酮类化合物质量分数最低,其中香叶醇质量分数最高;正交偏最小二乘判别分析(orthogonal partial least squares-discriminant analysis,OPLS-DA)能将‘金牡丹‘’福云7号’与其他茶树品种红茶区分开,且筛选出12种与芽型工夫红茶茶树品种密切相关的标志差异物。相关性分析结果表明,咖啡碱和茶多酚与回甘呈显著正相关,咖啡碱、可可碱与醇度呈显著正相关,香叶醇、顺-α,α-5-三甲基-5-乙烯基四氢化呋喃-2-甲醇、水杨酸甲酯、芳樟醇与花果香呈正相关。该研究为芽型工夫红茶的生产加工和品质提升提供了理论依据。展开更多
基金Supported by the Pillar Program of the Ministry of Science and Technology of China 2012BAF07B05
文摘A central composite design(CCD),with three variables and three levels,was used to optimize withering and fermentation processing during manufacture of Congou black tea of Sichuan.The three independent variables were withering time,fermentation time and fermentation temperature.Each factor was set by three levels.The responses were predicted by analysis of the regression equation.In the study,the models of regression equation were significant by the analysis of variance(ANOVA).The second-order response surface figures were showed that interaction term is correlated with the response.Optimal process parameters for the maximum of TF and TR formation were obtained at withering time of 12 hours,fermentation time of 2 hours,and fermentation temperature of 30℃.The predictions of TF and TR formation were 0.52% and 3.98%.The results obtained in this study showed that the CCD and Response Surface Methodology(RSM) could be an effective tool to optimize the process parameters of Congou black tea manufacture.
文摘为了解不同茶树品种制作的芽型工夫红茶品质差异,采用高效液相色谱技术、固相微萃取-气相色谱-质谱联用(SPME-GC-MS)技术、定量描述性分析和化学计量学对10个茶树品种芽型工夫红茶的特征滋味物质和特征香气成分进行分析。定量描述性分析结果表明,10个茶树品种芽型工夫红茶的整体香气以甜香、花香为主,滋味以甜醇、浓厚为主。不同样品中检测的16种内含成分(非挥发性成分)存在一定的差异,平均变异系数为21.63%,其中茶黄素的差异最大;在10个茶树品种红茶中共检测出49种挥发性物质,其中质量分数最高的挥发性物质类型为醇类化合物,其次为酯类化合物,酮类化合物质量分数最低,其中香叶醇质量分数最高;正交偏最小二乘判别分析(orthogonal partial least squares-discriminant analysis,OPLS-DA)能将‘金牡丹‘’福云7号’与其他茶树品种红茶区分开,且筛选出12种与芽型工夫红茶茶树品种密切相关的标志差异物。相关性分析结果表明,咖啡碱和茶多酚与回甘呈显著正相关,咖啡碱、可可碱与醇度呈显著正相关,香叶醇、顺-α,α-5-三甲基-5-乙烯基四氢化呋喃-2-甲醇、水杨酸甲酯、芳樟醇与花果香呈正相关。该研究为芽型工夫红茶的生产加工和品质提升提供了理论依据。