In this research for liquid–liquid extraction chloroform and dichloromethane were used for comparison.
However, it had been observed that many interfering matrices were extracted with chloroform than dichloromethane, due to this dichloromethane was selected for the extraction.
Extraction has been done according to the following procedures.
The coffee solution prepared above (under coffee sample preparation) was mixed with dichloromethane by volume ratio (25:25 ml) for the extraction of caffeine from coffee.