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溶解0.03--0.05g咖啡因(在105°干燥至互(?)重),在20ml CHCL_3-(CH_3CO)_2O混合液中(3:1体积比),加2--3滴猩红溶液(0.5g猩红1omlAC_2O加冰醋酸至100ml),立即用0.05N HCIO_4的冰醋酸溶液(5ml 67％ HCIO_4 80ml AC_2O加冰醋酸至1000ml,用隣苯二
Dissolve 0.03--0.05g of caffeine (dried at 105 ° C to reciprocal) in 20ml CHCL_3- (CH_3CO) _2O mixture (3: 1 volume ratio), add 2-3 drops of scarlet solution (0.5 g scarlet 1omlAC_2O with glacial acetic acid to 100ml) immediately with a solution of 0.05N HCI04 in glacial acetic acid (5ml of 67% HCI0_4 80ml of AC2O in glacial acetic acid to 1000ml of o-