With Camellia sinensis( L.) O. Kuntze cv Fuding Dabaicha as the control,an experiment was conducted to study the adaptability of Yunnan tea cultivars Zijuan,Yunkang 10,Yunkang 14,Foxiang 3,Yuncha 1,Jinggu Dabaicha,Xue...With Camellia sinensis( L.) O. Kuntze cv Fuding Dabaicha as the control,an experiment was conducted to study the adaptability of Yunnan tea cultivars Zijuan,Yunkang 10,Yunkang 14,Foxiang 3,Yuncha 1,Jinggu Dabaicha,Xueya 100,in Zhangzhou,south Fujian tea area,during 2012- 2014. The results show that the tea cultivars( Yunkang 14,Foxiang 3,Jinggu Dabaicha) grow in general conditions;while the cultivars( Zijuan,Yunkang 10,Yuncha 1,Xueya 100) show good adaptability in south Fujian tea area,and they grow in good conditions,and they are as good as the control cultivar Fuding Dabaicha,in terms of bud leaf traits,resistance and chemical quality,etc. So these cultivars are suitable for cultivation in southern Fujian tea area.展开更多
A study was conducted to determine the effect of seasons in 23 different Kenyan commercially released tea cultivars. This was done for three seasons viz: cold and wet, cold and humid, hot and dry. The cold and wet sea...A study was conducted to determine the effect of seasons in 23 different Kenyan commercially released tea cultivars. This was done for three seasons viz: cold and wet, cold and humid, hot and dry. The cold and wet season was shown to be the best for obtaining high levels of theanine while the hot and dry season resulted in decrease in theanine levels in most of the test cultivars thus showing seasonal variation on the levels of theanine. Theanine content was determined using High Performance Liquid Chromatography (HPLC). On average, TRFK 31/8 contained 1.20% dw of theanine and highest in green tea while TRFK 56/89 contained 0.97% dw of theanine and highest in black tea. Green tea contained higher theanine levels than black tea and this has been shown in most of the test cultivars. To achieve the health benefits of theanine, one should drink 4 cups of tea brewed from cultivars with 0.63% dw and more of theanine. Also theanine levels were determined in the different partitions of the tea shoot (4 leaves + bud) and the internode contained the highest theanine levels up to 3.26% dw for both cultivars compared to the leafy partitions.展开更多
为揭示云南两个品种基于六堡茶工艺加工后的茶叶的香气成分,探讨较为合适制作六堡茶的茶树品种,采用顶空固相微萃取-气相色谱-质谱联用技术(Headspace Solid-Phase Micro Extraction and Gas Chromatography Mass Spectrometry,HS-SPME-...为揭示云南两个品种基于六堡茶工艺加工后的茶叶的香气成分,探讨较为合适制作六堡茶的茶树品种,采用顶空固相微萃取-气相色谱-质谱联用技术(Headspace Solid-Phase Micro Extraction and Gas Chromatography Mass Spectrometry,HS-SPME-GC/MS),结合相对香气活度值(Relative Odor Activity Value,ROAV)法分析云南两个品种茶叶渥堆发酵的挥发性成分。结果表明,共检测出152种挥发性成分,以醇类、酯类挥发性成分种类为主,以芳樟醇、月桂烯醇、壬醛、二氢猕猴桃内酯、亚麻酸甲酯和棕榈酸甲酯相对含量较高。ROAV贡献值分析结果显示:两个品种加工过程中主要香气贡献挥发性成分有19种,两个样品显著(P<0.05)贡献的香气化合物包括苯甲醇、癸醛、壬醛、α-紫罗酮、1-辛烯-3-醇、雪松醇、芳樟醇、反式-芳樟醇氧化物(呋喃型)。壬醛、癸醛、β-紫罗兰酮等3种挥发性有机化合物对云抗10号(Y6)陈香的形成具有较大贡献,α-雪松醇、长叶蒎烯、β-柏木烯、右旋萜二烯、α-紫罗酮等5种挥发性有机化合物对黑龙潭群体种(H6)陈香透参香的形成具有较大贡献。本研究从香气成分的角度明确了云抗10号、黑龙潭群体种均适合作为六堡茶原料,其中黑龙潭群体种在感官审评、关键香气成分种类和含量都高于云抗10号,因此黑龙潭群体种相较于云抗10号更适合做六堡茶。展开更多
Umami is one of the five basic tastes and an important taste attribute of green tea.Amino acids are major components contributing to umami taste and the top three amino acids in tea are theanine,glutamic acid and aspa...Umami is one of the five basic tastes and an important taste attribute of green tea.Amino acids are major components contributing to umami taste and the top three amino acids in tea are theanine,glutamic acid and aspartic acid.Trace of umami taste components adenosine monophosphate(AMP) and guanosine monophosphate(GMP) were detected in tea.Levels of umami taste components varied with tea cultivar,environmental conditions,fertilizer and processing method.The taste threshold of amino acids differentiated greatly and its DOT(dose over threshold) is an important indicator evaluating its contribution to umami taste.展开更多
基金Supported by Youth Project of Fujian Provincial Department of Education(JA15908)
文摘With Camellia sinensis( L.) O. Kuntze cv Fuding Dabaicha as the control,an experiment was conducted to study the adaptability of Yunnan tea cultivars Zijuan,Yunkang 10,Yunkang 14,Foxiang 3,Yuncha 1,Jinggu Dabaicha,Xueya 100,in Zhangzhou,south Fujian tea area,during 2012- 2014. The results show that the tea cultivars( Yunkang 14,Foxiang 3,Jinggu Dabaicha) grow in general conditions;while the cultivars( Zijuan,Yunkang 10,Yuncha 1,Xueya 100) show good adaptability in south Fujian tea area,and they grow in good conditions,and they are as good as the control cultivar Fuding Dabaicha,in terms of bud leaf traits,resistance and chemical quality,etc. So these cultivars are suitable for cultivation in southern Fujian tea area.
文摘A study was conducted to determine the effect of seasons in 23 different Kenyan commercially released tea cultivars. This was done for three seasons viz: cold and wet, cold and humid, hot and dry. The cold and wet season was shown to be the best for obtaining high levels of theanine while the hot and dry season resulted in decrease in theanine levels in most of the test cultivars thus showing seasonal variation on the levels of theanine. Theanine content was determined using High Performance Liquid Chromatography (HPLC). On average, TRFK 31/8 contained 1.20% dw of theanine and highest in green tea while TRFK 56/89 contained 0.97% dw of theanine and highest in black tea. Green tea contained higher theanine levels than black tea and this has been shown in most of the test cultivars. To achieve the health benefits of theanine, one should drink 4 cups of tea brewed from cultivars with 0.63% dw and more of theanine. Also theanine levels were determined in the different partitions of the tea shoot (4 leaves + bud) and the internode contained the highest theanine levels up to 3.26% dw for both cultivars compared to the leafy partitions.
文摘为揭示云南两个品种基于六堡茶工艺加工后的茶叶的香气成分,探讨较为合适制作六堡茶的茶树品种,采用顶空固相微萃取-气相色谱-质谱联用技术(Headspace Solid-Phase Micro Extraction and Gas Chromatography Mass Spectrometry,HS-SPME-GC/MS),结合相对香气活度值(Relative Odor Activity Value,ROAV)法分析云南两个品种茶叶渥堆发酵的挥发性成分。结果表明,共检测出152种挥发性成分,以醇类、酯类挥发性成分种类为主,以芳樟醇、月桂烯醇、壬醛、二氢猕猴桃内酯、亚麻酸甲酯和棕榈酸甲酯相对含量较高。ROAV贡献值分析结果显示:两个品种加工过程中主要香气贡献挥发性成分有19种,两个样品显著(P<0.05)贡献的香气化合物包括苯甲醇、癸醛、壬醛、α-紫罗酮、1-辛烯-3-醇、雪松醇、芳樟醇、反式-芳樟醇氧化物(呋喃型)。壬醛、癸醛、β-紫罗兰酮等3种挥发性有机化合物对云抗10号(Y6)陈香的形成具有较大贡献,α-雪松醇、长叶蒎烯、β-柏木烯、右旋萜二烯、α-紫罗酮等5种挥发性有机化合物对黑龙潭群体种(H6)陈香透参香的形成具有较大贡献。本研究从香气成分的角度明确了云抗10号、黑龙潭群体种均适合作为六堡茶原料,其中黑龙潭群体种在感官审评、关键香气成分种类和含量都高于云抗10号,因此黑龙潭群体种相较于云抗10号更适合做六堡茶。
基金financially supported by the Coca-Cola Beverage (Shanghai) Co.,Ltd
文摘Umami is one of the five basic tastes and an important taste attribute of green tea.Amino acids are major components contributing to umami taste and the top three amino acids in tea are theanine,glutamic acid and aspartic acid.Trace of umami taste components adenosine monophosphate(AMP) and guanosine monophosphate(GMP) were detected in tea.Levels of umami taste components varied with tea cultivar,environmental conditions,fertilizer and processing method.The taste threshold of amino acids differentiated greatly and its DOT(dose over threshold) is an important indicator evaluating its contribution to umami taste.
