of Caffeine from Lipton® Tea Leaves Nathaniel Camangon*‚ Kaila Bumagat‚ Franz Mari Burgos‚ Remigio Callanta Department of Chemistry‚ College of Science‚ University of Santo Tomas‚ Manila‚ Philippines Abstract This experiment mainly focuses on the extraction of pure caffeine by multiple extraction from commercially acquired tea leaves and determining its purity by melting point determination. A 0.02% yield of pure caffeine was obtained from 10.4978g of tea leaves (4 tea bags). The acquired
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medium polarity; it was further separated from water soluble compounds using a polar non-protic solvent‚ dichloromethane (CH2Cl2). Sublimation was then used for the purification of the targeted compound. Based from the data collected‚ 5.758g of tea leaves contains 3.96% caffeine. After the purification process‚ 0.2279g of caffeine was obtained from 0.4948g crude extract with 46.06% yield. Melting point determination was used to characterize the caffeine yielded. However‚ the melting point range of
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after 24 and 48 hours in each test‚ against 7 day old (3rd instar) larvae of S. litura on castor leaves. Stock solutions of the test compounds were prepared in the carrier solvents. Further dilution was done in emulsified water by maintaining emulsifier (Tween – 80) level at 0.5 % to yield various concentrations. Castor leaf discs (4 cm diameter) were punched out from the washed and dried castor leaves. Leaf discs were dipped thoroughly in each of the concentration and air dried. Moist filter paper
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Abstract This work describes the extraction of caffeine from tea leaves to determine its % caffeine. The extraction process selectively dissolves one or more compounds in a mixture into an appropriate solvent. In this experiment‚ it was visible in the process wherein the components of the tea leaves were dissolved in two solvents‚ water and dichloromethane (DCM)‚ with DCM used for multiple extractions. The organic layer was evaporated and the determined % caffeine was 0.12%. Furthermore‚ the purified
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“CAN CACAO LEAVES KILL PESTS?” SUBMITTED BY: LOUIE ANNE C. DIVINAGRACIA SUBMITTED TO: MADEL F. VALENCIA I. INTRODUCTION A. Background of the study We all know that insects can be seen everywhere and the only way to prevent these insects are to use insecticides. For us‚ a house is a place of residence. It is usually a place in which an individual or a family can rest‚ store personal property‚ and prepare food in able for the house fulfils its function‚ we need to eliminate some
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cancelled the rest of the week and there was a mandatory evacuation! When I got home from school it was like a mad house! Leashes were laying around‚ clothes were thrown around the room‚ and there were suitcases. My mom and dad decided that we should leave and evacuate to Atlanta because my mom already had to go there for business that weekend anyway. So that Monday morning
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If an employee leaves a company to work for a competitor‚ what types of knowledge could be ethical for the employee to share with the new employer and what types of knowledge would be unethical to share? With business in constant competition‚ losing an employee to a competitor could pose threat to the success of a company with the knowledge a former employee brings the competitor. Ethics‚ by contrast‚ is defined as the principles and standards of moral behavior that are accepted by society as
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know on Thursday 23 June 2016 UK held a referendum to decide whether the UK should leave or remain in the European Union. The EU is a political and economic partnership between 28 countries that started after World War. This with the theory that countries that trade together are more likely to avoid going to war with each other. In Britain 30 million people or 71.8% of the population turned out to vote. The leave vote won by 51.9% to 48.1% which has been labelled Brexit. The result was a shock to
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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 (CH₂Cl₂). Dichloromethane is less polar than water
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depends on the product’s relevant benefits provided by the company‚ the brand’s perceived ability to provide the benefits as well as on the uniqueness of the product. Beauty soap is a necessary product. Customers purchase the product normally for skin friendliness‚ less use of quantity‚ anti-bacteria etc. benefits. Some beauty soaps including Lux‚ Meril‚ Keya are available in Bangladesh. All of these brands are exposed to advertisement. The attitude of a brand loyal customers to these brands or to its
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