如何從"茶葉"中分解出"可卡因"

可卡因 = cocaine - I don't think there's ANY cocaine in tea!!!!! Otherwise we'd be dead by now, especially those who drinks 3 cups a day - don't you think so????
Do you actually mean 'caffine from tea leaves'??

2007-03-21 01:00:17 補充：
If it's caffine then you can use a very simple organic extraction method, no need to use anything complicated like the one mentioned by the poster below me. I can't remember the exact procedure (it's been many years since I've done this experiment) -

2007-03-21 01:03:54 補充：
1st step involves soaking the dry tea leaves with methanol or ethanol. This will extract out the organic substances. Or you can distill the dry leaves in boiling water, followed by extraction of the aqueous solution with an organic solvent (eg. dichloromethane or ethyl acetate) -

2007-03-21 01:07:16 補充：
Then the organic layer needs to be basified with NaOH or something similar, then washed with water. The organic solvent is then removed and the residue left should be caffine (which is a white solid).

2007-03-21 01:07:40 補充：
You should search the web to find the exact procedure since I may not be 100% correct (but close)...

是咖啡因
用solvent extraction / Supercritical CO2 extraction


Supercritical carbon dioxide is now well established as a solvent for use in extraction (figure 1). This is for a number of reasons. It can generally penetrate a solid sample faster than liquid solvents because of it's high diffusion rates, and can rapidly transport dissolved solutes from the sample matrix because of it's low viscosity. There are also of course less solvent residues present in the products.

One of the most well known examples is the pioneering work of Zosel, where supercritical carbon dioxide was used for the decaffination of coffee and tea, which is now an established industrial process. Since then, many other examples have appeared including the extraction of hops, natural products, high value pharmaceutical precursors, essential oils, and environmental pollutants. Other important commercial technologies are also emerging involving supercritical carbon dioxide, such as dry cleaning (visit HEC to learn more) and paint spraying.

Another main area in which supercritical carbon dioxide is important is polymerization. This was pioneered by DeSimeone at the University of North Carolina, and has since developed into an extensive area of research. Initial work concentrated on flouropolymer synthesis, exploiting the known affinity of supercritical carbon dioxide for organofluorine compounds. The main driving force for this was that the usual reaction solvents for such polymerizations were chlorofluorocarbons (CFC's) which are now known to be environmentally unacceptable with consequent supply problems. This work has led to recent reports of a large-scale speciality fluoropolymer manufacturing plant using supercritical carbon dioxide. An initial $40million development facility is under construction by Dupont in the USA, which, if successful, will lead to a $235million commercial scale facility.