[Objective] This study aimed to test the effects of high-intensity pulsed electric field on the amino acid content in Pu’er tea leaves. [Method] The amino acid contents of fermented and unfermented the leaves of larg...[Objective] This study aimed to test the effects of high-intensity pulsed electric field on the amino acid content in Pu’er tea leaves. [Method] The amino acid contents of fermented and unfermented the leaves of large-leaf Pu’er tea variety produced in Yunnan Mengku, were measured before and after the treatment with high-intensity pulsed electric field （HPEF）. [Result] The difference of amino acid contents was notable between fermented and unfermented tea leaves produced in the same year. The amino acid content of unfermented tea leaves was larger than that in fermented tea leaves. The amino acid content in tea leaves decreased over time during storage. HPEF treatment under al the conditions improved the amino acid content in tea leaves. [Conclusion] This experiment provides theoretical foundation for the application of HPEF in processing of Pu’er tea leaves.展开更多
The current situation of Pu'er tea in Yunnan was analyzed.The analysis result showed that the production output of Yunnan tea and the tea plantation area increased greatly when compared with the whole country,but ...The current situation of Pu'er tea in Yunnan was analyzed.The analysis result showed that the production output of Yunnan tea and the tea plantation area increased greatly when compared with the whole country,but the increase of Pu'er tea inclined to be stable.The restraining factors of Pu'er tea development were explored,and the corresponding countermeasures were put forward.It provided the basis for the sustainable development of Yunnan Pu'er tea.展开更多
The rare earth elements contents (La, Ce, Pr, Nd, Sm) in 150 Pu er tea samples were analyzed by using inductively coupled plasma atomic emission spectroscopy (ICP-AES), to evaluate the safety of Pu er tea. Among the i...The rare earth elements contents (La, Ce, Pr, Nd, Sm) in 150 Pu er tea samples were analyzed by using inductively coupled plasma atomic emission spectroscopy (ICP-AES), to evaluate the safety of Pu er tea. Among the investigated rare earth elements (REEs), Ce was the highest (35% of the total REEs content) whose concentrations were found to be in the range of 0.11–1.39 mg/kg, whereas that of Sm in the range 0.01–0.21 mg/kg, showing minimum levels (5.2%). La was the second highest element (28%) found in Pu e...展开更多
基金Supported by Scientific Research Fund from Department of Education of Yunnan Province(2012Z134C)~~
文摘[Objective] This study aimed to test the effects of high-intensity pulsed electric field on the amino acid content in Pu’er tea leaves. [Method] The amino acid contents of fermented and unfermented the leaves of large-leaf Pu’er tea variety produced in Yunnan Mengku, were measured before and after the treatment with high-intensity pulsed electric field （HPEF）. [Result] The difference of amino acid contents was notable between fermented and unfermented tea leaves produced in the same year. The amino acid content of unfermented tea leaves was larger than that in fermented tea leaves. The amino acid content in tea leaves decreased over time during storage. HPEF treatment under al the conditions improved the amino acid content in tea leaves. [Conclusion] This experiment provides theoretical foundation for the application of HPEF in processing of Pu’er tea leaves.
基金Supported by the Earmarked Fund for Modern Agro-industry Technology Research System
文摘The current situation of Pu'er tea in Yunnan was analyzed.The analysis result showed that the production output of Yunnan tea and the tea plantation area increased greatly when compared with the whole country,but the increase of Pu'er tea inclined to be stable.The restraining factors of Pu'er tea development were explored,and the corresponding countermeasures were put forward.It provided the basis for the sustainable development of Yunnan Pu'er tea.
基金Project supported by the Foundation of National Key Technology R & D Program (2007BAD58B05-3)
文摘The rare earth elements contents (La, Ce, Pr, Nd, Sm) in 150 Pu er tea samples were analyzed by using inductively coupled plasma atomic emission spectroscopy (ICP-AES), to evaluate the safety of Pu er tea. Among the investigated rare earth elements (REEs), Ce was the highest (35% of the total REEs content) whose concentrations were found to be in the range of 0.11–1.39 mg/kg, whereas that of Sm in the range 0.01–0.21 mg/kg, showing minimum levels (5.2%). La was the second highest element (28%) found in Pu e...
