The ecological and climatic conditions in the main tea areas of western Guizhou were analyzed,and the comparison with Meitan,Duyun and Leishan tea areas in Guizhou Province was conducted. The results showed that sprin...The ecological and climatic conditions in the main tea areas of western Guizhou were analyzed,and the comparison with Meitan,Duyun and Leishan tea areas in Guizhou Province was conducted. The results showed that spring,summer and autumn tea can be picked in western Guizhou Province;spring tea can be picked for about 100 d,and summer and autumn tea can be picked for about 50 d. The average content of amino acids in tea from western Guizhou was 0.9%-2.9% higher than the national average,and the average content of polyphenols was 10.9% lower than the national average maximum,while the average content of caffeine was 1.4% lower than the national average maximum. In the first ten days of February,the temperature in the western tea area began to rise,which was earlier than Meitan,Duyun,Leishan tea areas and had a larger warming range,which was conducive to the germination of tea trees. The average temperature of ten days in the western tea area from middle May to early July was lower than that of Meitan,Duyun and Leishan tea areas,and the temperature rise was not violent,which was conducive to the growth of summer shoots and vigorous growth of tea buds. The ten-day average temperature of the western tea area from the first ten days of August to the last ten days of September was lower than Meitan,Duyun and Leishan tea areas,and its precipitation was more than Meitan,Duyun and Leishan tea areas,and the number of rainy and foggy days was more. The climate conditions are favorable for the formation of tea quality.展开更多
夏秋茶资源的高效利用是茶产业可持续发展的关键问题,而传统加工方式难以兼顾茶叶蛋白功能活性和营养特性。该研究旨在揭示高温高湿气流冲击漂烫(high-humidity hot air impingement blanching,HHAIB)处理对茶叶蛋白-多酚复合物(tea pro...夏秋茶资源的高效利用是茶产业可持续发展的关键问题,而传统加工方式难以兼顾茶叶蛋白功能活性和营养特性。该研究旨在揭示高温高湿气流冲击漂烫(high-humidity hot air impingement blanching,HHAIB)处理对茶叶蛋白-多酚复合物(tea protein-polyphenol complexes,TPC)结构及功能特性的调控机制,并评价其作为姜黄素递送载体的应用潜力。采用不同漂烫处理时间(0~210 s)处理夏秋茶粉,通过FTIR、荧光光谱等技术表征TPC结构变化,并系统评价TPC-果胶复合物稳定的Pickering乳液性能。结果表明,150 s处理使TPC二级结构发生显著转变(α-螺旋向β-折叠转化),分子相互作用增强(荧光强度提升)。90 s处理抗氧化活性提高(DPPH和ABTS阳离子自由基清除率分别达32.07%和35.40%),所构建的乳液体系表现出优异的稳定性(包封率79.13%,热稳定性保留率>70%)和控释特性(肠阶段姜黄素保留率78.85%),最终生物可及性达67.78%,较对照组提高32.51%。该研究首次阐明了HHAIB处理通过调控蛋白质构象提升功能活性的分子机制,为开发基于茶叶蛋白的高效营养素递送系统提供了理论依据和技术支撑,对促进夏秋茶资源高值化利用具有重要意义。展开更多
基金Supported by the Special Project for Building Science and Technology Cooperation and Innovation Capacity in Guizhou Province(52020-2015-01-02)。
文摘The ecological and climatic conditions in the main tea areas of western Guizhou were analyzed,and the comparison with Meitan,Duyun and Leishan tea areas in Guizhou Province was conducted. The results showed that spring,summer and autumn tea can be picked in western Guizhou Province;spring tea can be picked for about 100 d,and summer and autumn tea can be picked for about 50 d. The average content of amino acids in tea from western Guizhou was 0.9%-2.9% higher than the national average,and the average content of polyphenols was 10.9% lower than the national average maximum,while the average content of caffeine was 1.4% lower than the national average maximum. In the first ten days of February,the temperature in the western tea area began to rise,which was earlier than Meitan,Duyun,Leishan tea areas and had a larger warming range,which was conducive to the germination of tea trees. The average temperature of ten days in the western tea area from middle May to early July was lower than that of Meitan,Duyun and Leishan tea areas,and the temperature rise was not violent,which was conducive to the growth of summer shoots and vigorous growth of tea buds. The ten-day average temperature of the western tea area from the first ten days of August to the last ten days of September was lower than Meitan,Duyun and Leishan tea areas,and its precipitation was more than Meitan,Duyun and Leishan tea areas,and the number of rainy and foggy days was more. The climate conditions are favorable for the formation of tea quality.
文摘夏秋茶资源的高效利用是茶产业可持续发展的关键问题,而传统加工方式难以兼顾茶叶蛋白功能活性和营养特性。该研究旨在揭示高温高湿气流冲击漂烫(high-humidity hot air impingement blanching,HHAIB)处理对茶叶蛋白-多酚复合物(tea protein-polyphenol complexes,TPC)结构及功能特性的调控机制,并评价其作为姜黄素递送载体的应用潜力。采用不同漂烫处理时间(0~210 s)处理夏秋茶粉,通过FTIR、荧光光谱等技术表征TPC结构变化,并系统评价TPC-果胶复合物稳定的Pickering乳液性能。结果表明,150 s处理使TPC二级结构发生显著转变(α-螺旋向β-折叠转化),分子相互作用增强(荧光强度提升)。90 s处理抗氧化活性提高(DPPH和ABTS阳离子自由基清除率分别达32.07%和35.40%),所构建的乳液体系表现出优异的稳定性(包封率79.13%,热稳定性保留率>70%)和控释特性(肠阶段姜黄素保留率78.85%),最终生物可及性达67.78%,较对照组提高32.51%。该研究首次阐明了HHAIB处理通过调控蛋白质构象提升功能活性的分子机制,为开发基于茶叶蛋白的高效营养素递送系统提供了理论依据和技术支撑,对促进夏秋茶资源高值化利用具有重要意义。
