Caffeine is a stimulant that most people are familiar with. Most typically we connect it with coffee and sodas, but it is also found in certain foods, such as chocolate. The amount of caffeine will vary within coffee brands and in different chocolate bars, but through analytical methods we can determine an amount in each. We can then compare the results to find whether there is more caffeine in chocolate or in coffee. For this experiment I will give a brief overview of caffeine, theobromine, coffee and chocolate. Through analytical methods, I will show that there is more caffeine present in a single serving of coffee than in a chocolate bar. Caffeine is the common name for the chemical compound trimethylxanthine and is produced by many different plants, including coffee beans and cacao beans. Caffeine stimulates the central nervous system, heart rate, respiration, has mood altering properties, and acts as a mild diuretic (About.com). Theobromine is a chemical compound belonging to a class of alkaloid molecules known as methylxanthines. Methylxanthines naturally occur in caffeine. Theobromine affects people similarly to caffeine, but on a much smaller scale. Theobromine is a mild stimulant and a mild diuretic. (About.com). In order to analyze coffee and chocolate, we'll need to separate the components to be studied, known as the the analytes. Both coffee and chocolate are complex mixtures with the analytes being caffeine and theobromine. The first step in the analytical process is sample preparation. Sampling is the process of selecting a representative amount from the initial product. Sample preparation converts that sample into a homogenous laboratory sample. A homogeneous sample has the same composition throughout. A hetero... ... middle of paper ... ...s recorded. The procedure was repeated again for the same contorted sample and continued until we had recorded three chromatograms. We repeated the steps for each of the remaining standard samples, going from the most concentrated to the least concentrated, rinsing the syringe out a few times with the methanol/water mixture when changing to a caffeine sample of different concentration. Three chromatograms were recorded of each standard (ChemWiki). From the resulting chromatograms, measurements of retention time and peak areas were made. We used the area of all standard peaks to produce a calibration curve. Then using the calibration curve, we could determine the concentration of caffeine in each of the diluted samples. After determining the concentration of caffeine in the diluted samples, we could calculate the concentration of caffeine in the original sample.
Caffeine is a very interesting chemical. Caffeine is found in many places including coffee plant, tea leaves, kola nuts and cocoa (1). Humans then process these plants into food stuff that contains caffeine such as tea, coffee and chocolate. Caffeine is composed of 14 atoms with a molecular formula of C8H10N4O2. It is one of the few central nervous system stimulants still legal in most countries (2). The chemical name for caffeine is 1-methyltheobromine (2).
Caffeine is medically known as trimethylzanthine. Caffeine acts as a cardiac stimulant which means that it increases heart rate.
Caffeine is a mild stimulant that occurs naturally in at least 63 plant species. Caffeine can be found in the leaves, stems, seeds, and roots of these various plants. Caffeine is part of the methylxanthine family. It consists of a xanthine molecule with three methyl groups attached to it. Caffeine can be found in many products like sodas, tea, and coffee, but it also occurs in several other products such as prescription medications, diuretics, and pain relievers. Caffeine’s widespread use and popularity have caused many people to view the substance as an addictive drug. Thus making caffeine the most inexpensive and readily available drug known to man. Then on the other hand there are people who view caffeine as a helpful stimulant that increases the individual’s concentration and awareness as well as many other physical traits. The important thing to remember is that caffeine’s affects vary based on the person, the amount ingested, the frequency of consumption, and individual metabolism. (http://www.pp.okstate.edu/ehs/kopykit/caffeine.html)
Caffeine is the most popular and most widely used stimulant in the world. In Canada, the average person drinks 2.6 cups of coffee a day; that is equivalent to 949 cups of coffee a year. (Van Houtte) Caffeine is a central nervous system stimulant that improves ones attention, focus, and fatigue. When caffeine is ingested it causes your neurons to move at a faster rate, increasing alertness. (Fit Day) Caffeine also binds to the neural receptors, which blocks the adenosine, which prolongs tiredness. Caffeine is a white odorless powder that is most commonly found in coffee, tea, energy drinks, and pops. Caffeine can also be considered and ergogenic aid. Ergogenic aids are external influences that enhance/ improves ones strength, endurance, reaction time and speed of recovery. (Healthline) The three theories that make caffeine an ergogenic aid during exercise is the effect it has on the central nervous system, skeletal muscles, and metabolic changes. (Sheila G. Dean) Caffeine also has a positive effect on an individual’s health, some positive effects include: reduces risk of developing liver cancer, Parkinson’s disease, and Alzheimer’s. (Chawala) Caffeine has been proven to have positive effects on an athlete’s performance, and ones overall health.
Caffeine and coffee are a daily part of life for most people in modern society. The discovery of the coffee bean is said to have been in Ethiopia, when a sleepy eyed goat herder noticed his goats eating red berries, he then noticed the effect it had on them as they jumped and danced around him. He then tasted the berries and his eyes opened wide, he took them to the local village who also liked it and in particular the monks who used the berries to keep them awake during meditation.
The extraction process was used to extract crude caffeine from a black tea bag, and sublimation was used next to purify the crude caffeine. The vital result from the experiment is the amount caffeine obtained, but as a result of errors during the experiment, no caffeine was obtained. This lab could be enhanced in several ways. The proper tools should be provided to ensure that no error is a result from the lab materials and the directions of the experimental procedure should be
After the sublimation technique was performed, no pure caffeine was obtained from the test tube. This resulted in a 0 percent yield when compared to the total mass of the tea leaved at 2.673 g. It also created a 0 percent yield when compared to the 0.094 g of crude caffeine that originally began the sublimation process. No pure caffeine was obtained mainly due to the many errors that occurred during extraction. Furthermore, a slight burnt aroma was protruding from the flask. This led to the conclusion that the act of healing the crude caffeine was flawed. According to Onami and Kanazawa (1996), a 2 g sample of tea leaves should yield about 0.02 - 0.03 g of pure caffeine, and this value matches with the original expected value of 0.047 g of caffeine in 2.673 g of tea. Since no pure caffeine was obtained, a sample of caffeine provided by the lab was used to test the melting point. The melting point of this compound was determined to be 236 - 238 ºC, which matches perfectly with the expected value of 238
Caffeine, also known as methyltheobromine, is a central nervous system stimulant that humans consume on a daily basis. Found in coffee, tea, and other caffeinated beverages, caffeine has many side effects. While caffeine can make the consumer feel more alert, there are health concerns such as dependence and hypertension.
The question that was tested for this Heart Rate Lab was how might caffeine affect people’s heart rate. Caffeine is supposed to affect our nervous system and brain by buzzing them. We decided to include caffeine in our lab by having one out of 2 groups of 5 people drink caffeinated soda .Then, participants completed two activities, taking their pulses after each event. The second group (B) did everything just as group A, except drink any soda. Our hopes were that pulse rates would raise higher with caffeine in the blood stream, and this lab did not disappoint.
On average, people will consume about 300 mg of caffeine a day through mostly coffee, soda, and tea (Villanova). Caffeine is an addictive substance that is considered safe enough to be sold with few to no restrictions. People of any age can go to a convenience store or coffee shop to get their daily dose of caffeine and become addicted without realizing it. With recently updated laws on the restrictions of buying tobacco products in Oregon, questions of other possible restrictions on substances have surfaced. The question of whether or not products containing caffeine should be restricted in order to protect younger consumers is not a new issue. Many people have debated over whether or not the process would be worthwhile or necessary.
Caffeine is a molecule that has many characteristics of cocaine and heroin. This is so because the all make people hyper and crazy. The chemical formula is C8H10N4O2. The atoms in the Caffeine carbon, hydrogen, nitrogen,and oxygen.
Caffeine plays an enormous role in society today, from coffee to cokes to candy bars. Companies have made billions off the desire for that extra kick. Caffeine is the most widely consumed behaviorally active substance in the world making it one of the world’s most popular drugs. It’s known for the ability to stimulate the brain and central nervous system. The Chemical structure of caffeine is C8H10N4O2. Before the popular use of caffeine one can assume that people were sleepier, and less alert.
Caffeine exists in more than 60 species of plants and, caffeine is stimulant substance normally present in coffee, tea, soft drinks and chocolate, energy drinks are also available in some medicines. Caffeine is the alkaloid substance, and there are articles and several vehicles are classified under the list of semi-alkali, including Methylxanthines, which consists of three vehicles: Theophylline, Caffeine, Theobromine, which is located in coffee, tea and other plants. These compounds have a biological effect and different chemistry in different proportions. In spite of that these compounds are similar but different only in terms of containing the methyl group (methylCH3), but oxidized easily and turn into uric acid and other acids which are similar in chemical composition. Caffeine and its breakdown products have number of effects on the body. First, they disrupt the normal function of adenosine receptors, biochemical control switches found throughout the brain, kidneys, gastrointestinal tract cardiovascular system and respiratory system. Caffeine can trigger a classic fight-or-flight which is a condition response to gave us increased strength, stamina, and speed when we need it. For example, when we consume caffeine the air ways dilate to increase availability of oxygen, the liver releases sugars and fat into the blood to fuel the survival effort. The heart rate and blood pressure increase to supply fuel to muscles and circulation reduced in digestive system to make more blood available to muscles. As a result, caffeine physiologically causes the fight or flight mechanism (1 Stephen 57-58).
Caffeine is a chemical found in coffee, tea, soft drinks and various easy to get foods and drinks. Like all drugs, caffeine has its good and bad side. Caffeine’s categorized as a stimulant, meaning it temporarily increases alertness and energy. With this stated, you may ask yourself, what’s so bad about a little high associated with coffee or chocolate? I mean it’s practically harmless, right.
Caffeine. All of you probably already know what caffeine is. In case you don’t, it is a common legal stimulant drug, that is in a lot of the things that we eat and drink. In its pure form,it is a white powder, but it is also found in many different types of plants. Some of the most known products with caffeine in them are coffee,chocolate,sodas and tea. What you might not know is that caffeine is also in things you might not expect, such as pain killers and sometimes even ice cream. Caffeine is in many things, 90% of Americans eat or drink caffeine in some way shape or form on an everyday basis.I am going to be telling you more about this drug, such as side effects and benefits that would come from having it.