he decided to make pure caffeine in his garage. The extraction began with green coffee beans inside the drying chamber. Liquid CO2 is pumped in and heated to the supercritical point. After a few ...

Students will determine the retention time of pure caffeine. From this information ... You will use a high performance liquid chromatography instrument (HPLC) to analyze caffeine in various beverages.

"In particular, pure caffeine powder in loose form is problematic," says BfR expert Ehlers. "It is in such a high concentration that you just can't measure it with a kitchen scale." The safe ...