Extraction of caffeine from Lipton tea leaves Maria Gianna Beatrice L. Cancio*‚ Joe Mari Isabella B. Caringal‚ Rowena A. Chiang‚ Patricia Deanne del Valle Department of Biological Sciences‚ College of Science‚ University of Santo Tomas‚ España‚ Manila‚ Philippines Abstract Caffeine was extracted from Lipton tea leaves by multiple extraction techniques namely solid to liquid extraction and liquid to liquid extraction; the purification by sublimation and melting point determination. Three
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establish a correlation between caffeine intake and the effects it has on both the pulse and respiration rates of an individual after undergoing moderate-intense cardiovascular exercise. Caffeine itself is one of the most heavily consumed drugs on the planet; it is estimated that over 90% of Americans consume caffeine daily (Richard Lovett‚ 2005‚ New Scientist iss. 2518) and is the most widely used stimulant in the world (Arcerio‚ P‚ Ormsbee‚ J‚ 2009‚ pg. 1). Caffeine stimulates the brain and behaviour
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1111/j.1360-0443.2008.02430.x The global alcohol industry: an overview David H. Jernigan Department of Health‚ Behavior and Society‚ Johns Hopkins Bloomberg School of Public Health‚ Baltimore‚ MD‚ USA ABSTRACT Aims To describe the globalized sector of the alcoholic beverage industry‚ including its size‚ principal actors and activities. Methods Market research firms and business journalism are the primary sources for information about the global alcohol industry‚ and are used to profile the size
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are the affects of stimulants like (Caffeine and Amphitemine) on the study and learning habits for college students? Caffeine is a central nervous system (CNS) stimulant with a charge that rise energy‚ mood‚ awareness‚ concentration‚ and wakefulness. Caffeine is the most widely used drug in the world. Caffeine can be found in teas‚ coffee‚ energy drink and chocolate caffeine is also very popular among student‚ as a supplement and as a study aid. Drinking caffeine can have many effects‚ both positive
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In this lab‚ caffeine was extracted from black tea‚ and green tea through a vacuum filtration‚ and a rotovap. The melting point of the sample of black tea was 219.12-236.05 ˚c‚ and for the green tea it was 176.22-227.6 ˚c. The % error of the melting point indicates how much error there was from the melting point taken experimentally. The % error of the melting point for black tea was 0.44%‚ and for green tea it is 3.15%.Since the theoretical melting point of caffeine is between 235-237 ˚c‚ we can
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Report The effect of caffeine on long-term memory Introduction: What is caffeine? Caffeine is one of the commonly consumed or most ingested stimulant or psychoactive substance in the world‚ known for it’s effect on vigilance and alertness level (A. Smith‚ 2002) or at least perceived to jolt our tired brains‚ when consumed in normal or moderate quantity. Caffeine is available to us from various sources like coffee‚ tea‚ cocoa‚ soft drinks and other such products. Caffeine is basically 1‚3‚7-trimethylxanthine
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Extraction of Caffeine from Tea Leaves Marc Tugaoen‚ Kristine Vanzuela‚ Rafael Villanueva‚ Justeen Wong Department of Chemistry‚ University of Santo Tomas‚ Manila‚ Philippines Abstract This experiment has been divided into 4 set-ups‚ first was the solid-liquid extraction‚ next was the liquid-liquid extraction‚ then the sublimation and last was the melting point determination. The solid-liquid and liquid-liquid extraction were both done during the first meeting‚ the DCM layer was filtered and
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TOPIC: ORGANIZATIONAL POLICIES REGARDING ALCOHOL AND SUBSTANCE ABUSE INDEX CHAPTER PAGE NO. ABSTRACT 2 1. INTRODUCTION 3-6 2.1. INTRODUCTION 3 2.2. Purpose of the Study 5 2.3. Background of the Organization 5 2.4. Research Objectives 5 2.5. Research Questions 6 2.6. Significance Of The Study 6 2. LITERATURE REVIEW 7-19 3.7. Review of Previous and Current Studies 7
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Nicoleta Nedelcu Caffeine-induced effects on heart rate in zebrafish embryos and possible mechanisms of action Observation Caffeine is found in coffee‚ tea leaves‚ cocoa beans‚ and kola nuts. It is used in prescription and over the counter drugs. It increases blood pressure‚ mental alertness‚ and gastrointestinal motility. Cardiovascular development with caffeine and other small molecules can be studied relatively easy using zebrafish. The cardiovascular system is complete in two days after fertilization
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of alkaloid caffeine from tea leaves Date Submitted: September 3‚ 2014 Abstract Caffeine is one of the main constituents of tea leaves. In this experiment‚ 0.0039 g of pure caffeine was isolated from tea leaves. This was done through solid-liquid extraction followed by multiple liquid-liquid extraction. Then crude material obtained was then purified by sublimation. The isolated caffeine was subjected to thin layer chromatography (TLC) together with a standard caffeine. The Rf value
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