天气预报 > 其他 > 泡完茶茶上面漂一层油是什么
泡完茶茶上面漂一层油是什么
更新时间: 2020-09-24 00:00:00  

茶表面的油层是一种单宁类物质“鞣酸”。

“鞣酸”广泛存在于果蔬植物中,无论是好茶叶还是普通的茶叶都含有鞣酸。茶表面之所以会漂着油是因为茶叶里的单宁氧化所致。单宁物质氧化时还与铁离子结合,形成黑色的鞣酸铁。

关键词: 上面 什么

泡完茶茶上面漂一层油是什么相关经验

天气预报

最新推荐

页面:/news/view-496702/ | 耗时:0.5130 s | 内存:2.11 MB | 查询:4 | 缓存读取:3 写入:0 | 加载文件:25
select * from tbl_Articles WHERE ArticleID=496702 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=496702 LIMIT 0,1
select * from tbl_Articles_sphinx where id=496702 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1064345,1100091,1041283,1884037,1067265,1055596,1130093,1048945,1049030,1079606,1095063,1113421,1128387,1131053,1062618,1068186,1065919,1060299,1066132,1127445,1130654,1067395,981848,1065727,1064085,1063117,1305766,1128675,1087475,1085184) ORDER BY field (ArticleID,1064345,1100091,1041283,1884037,1067265,1055596,1130093,1048945,1049030,1079606,1095063,1113421,1128387,1131053,1062618,1068186,1065919,1060299,1066132,1127445,1130654,1067395,981848,1065727,1064085,1063117,1305766,1128675,1087475,1085184)