Date: 9-10-13 Title: HPLC analysis of Caffeine Lab Partners: Objectives: 1) The main objective of this lab is to gain experience in using and reading results from the HPLC machine. 2) The first step is to inject a series of caffeine standards into the machine in order to get results/values of peak height and area. 3) The next step is to investigate the effects of a series of HPLC parameters on Retention time‚ peak height and peak area. 4) To use above data from peak height and area
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parties‚ sports activities and friends. The result is that young people suffer from stress. There are different ways of dealing with stress. Everyone knows that caffeine‚ whether it is in the form of coffee or soft drinks‚ keeps you awake and alert. But caffeine is a drug which can become addictive. In the end‚ like other drugs. caffeine only leads to more stress. A better way to deal with stress is to exercise: Research has proved that physical exercise is a good release for stress‚ because it increases
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concentration of caffeine bulbs B‚ C‚ and D were in: 0.1%‚ 0.3%‚ and 0.5%. Four test tubes were gathered to set up the experiment‚ each holding an onion bulb. After each day‚ every individual bulb’s roots were counted and the average length was recorded. After recording this information for six days‚ an onion root tip from each bulb was taken and squashed under a coverslip. These root tips were then looked at under a microscope.
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the experimental hypothesis was accepted. These findings could be due to the negative phototactic response that occurs when they are exposed to visible light that are above 600 Mn (nanometers) that are also considered the color red. This shows that Daphnia have a greater phototactic reaction to red light than when exposed to white light. When compared to a similar study‚ the same result was found. It was reported that there was a significant difference in the Daphnia’s phototactic reaction when exposed
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Aim: This is the reason for doing the experiment. It may contain a research question‚ but it must state what it is that we are investigating or what we hope to find out. Hypothesis: This is the basis behind your plan which leads you to believe that the experiment can be successfully carried out. It may also contain a prediction of the final answer (supported by a reason) Method: This is what was actually done or is going to be done. It may need a diagram‚ in which case it should be drawn
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Does caffeine affect heart rate? Background Information: Caffeine is a bitter white crystalline xanthine alkaloid that acts as a psychoactive stimulant drug. A German chemist‚ Friedrich Ferdinand Runge‚ discovered it in 1819. Plants produce caffeine as an insecticide. It is found in varying quantities in the beans‚ leaves‚ and fruit of over 60 plants‚ where it acts as a natural pesticide that paralyses and kills certain insects feeding on the plants. Cocoa in South America‚ coffee in Africa
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Caffeine plays a big role in todays society. Caffeine is found in some beverages such as coffee and tea (Sciencedaily.com). Americans consume 400 million cups of coffee per day‚ equivalent to 146 billion cups of coffee per year (The Huffington Post‚ 2011). This made the United States the leading consumer of coffee in the world (The Huffington Post‚ 2011). People never realize the effect caffeine can have on their body. Caffeine could be a reason why you become dehydrated. Can caffeine cause dehydration
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those that didn’t know this‚ caffeine is a drug. B. Statistics have proven that any amount exceeding “five or more cups of coffee will increase the risk of cardiac arrest (Caffeine).” “60 percent of the total caffeine consumed in the United States is from coffee as well as 16 percent comes from soft drinks and teas (Caffeine).” Many children and adults consume coffee on the daily and they do so to get energy into their body. “The average daily consumption of caffeine for adults in the United States
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Determination of Caffeine in Tea Samples CONTENTS 1. 1. Introduction 2. 2. Theory 3. 3. Uses of Caffeine 4. 4. Effects of Caffeine 5. 5. Procedure 6. 6. Observations 7. 7. Result INTRODUCTION Tea is the most commonly and widely used soft beverage in the household. It acts as a stimulant for central nervous system and skeletal muscles. That is why tea removes fatigue‚ tiredness and headache. It also increases the capacity of thinking. It is also used for lowering body temperature
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to eliminate caffeine from their diet. Central idea: By reducing the use of caffeine‚ individuals can break their addiction and become healthier. They can regain their sleep‚ activeness and become more aware. Introduction I. Imagine‚ you’ve got a math test tomorrow that you’ve hardly studied for and not to mention that a fifteen page paper you’ve also got due tomorrow. It’s already after midnight and you’ve only got 3 pages written. How are you going to stay awake? II. Caffeine is used to provide
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