Extraction of Caffeine from Tea Leaves - 1151 Words

Extraction of Caffeine from Tea Leaves Introduction Caffeine is soluble in boiling water and as a result it is easily extracted from tea bags by steeping in hot water. This process leaves behind the water insoluble portions of the tea bag. However, water extracts more than just caffeine, so a final separation is done with an organic solvent that will dissolve primarily caffeine. The organic solvent used in this experiment is Dichloromethane (CHâ‚‚Clâ‚‚). Dichloromethane is less polar than water and this difference in polarity allows the separation. Extraction of the tea with the Dichloromethane, followed by evaporation of the organic solvent leaves crude caffeine, which on sublimation yields a relatively pure product. Sublimation is†¦show more content†¦On the TLC plate our tea extract traveled almost the same distance as pure caffeine. The Co-spot traveled the exact same distance as the pure caffeine. The Rf values for caffeine and the Co-spot were 0.166. The Rf value of the tea extract was 0.133. The diff erences in the spots could be due to some impurities in the tea extract and differences in concentration of each spot. After the sublimation 0.003g of pure caffeine was scraped from the test tube. The melting point range of the pure caffeine was tested and found to be 237-239 degrees Celsius. The actual melting point of caffeine is 238. Conclusion The results of the TLC plate showed that the tea extract was very close to the sample of pure caffeine. It was slightly off possibly due to impurities that remained in the tea extract. The caffeine weighed in the flask after the liquid-liquid extracted was 0.012g, which was different from the weight of the caffeine obtained after the sublimation. This difference was likely due to impurities in the caffeine before being purified by sublimation. The caffeine that was extracted from the sublimation experiment had a melting point of 237-239 degrees Celsius, which is the same as the reported value for caffeine. The sublimation resulted in having a totally pure extract of caffeine. Questions 1. Why is sodium chloride added to the tea solution beforeShow MoreRelatedUsing Solid Liquid Extraction Of Caffeine From Tea Leaves867 Words   |  4 PagesThe purpose of this experiment was to use solid-liquid extraction to isolate a crude sample of caffeine from tea leaves and then subsequently purify the isolated sample via sublimation. The two solvents used in the extraction were water and dichloromethane. In addition to caffeine, tea leaves also contain other compounds that must be dealt with including cellulose, proteins/pigments, tannins, and saponins. 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