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中国普洱茶网
24 天
工艺装备,烘焙对祁门红茶香气品质的影响
2、 挥发性成分检测 采用顶空固相微萃取方法(Headspace-solid phase microextraction, HS-SPME)对香气进行吸附,以茶水比1∶50制作茶汤,冷却后取10 mL茶汤至萃取瓶中,利用萃取头在40 ℃水浴下顶空吸附50 min。萃取结束后将萃取头插入气相色谱进样口解吸附5 min。利用GC-MS ...
中国网
9 天
一场中国与世界的“双向奔赴”
沙利文访华,是八年来美国总统国家安全事务助理首次访华,无论美方为何种目的,中美加强沟通接触都将为双边关系增添更 ...
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