Documents about Caffeine Extraction

  • 1 Pages

    problem_set5

    Washington, CHEM 241

    Excerpt: ... For Problem set #5: Here are some thought provokers for the Caffeine extraction conclusion section of you notebook: Know the structures for caffeine and the 2 primary impurities mentioned in lecture. Be able to assess as to which layer they will be dissolved in during the extraction portion of the lab. ...

  • 1 Pages

    abstract

    Uni. Westminster, JS 0516

    Excerpt: ... Jazzy Sharifan Write up #7 Caffeine Extraction Abstract In this study, the caffeine content of black tea was investigated and experimental data is displayed. The caffeine was extracted from a sodium carbonate and tea extract using dichloromethane. After the initial extraction, the dichloromethane layer was then centrifuged for fur ther separation of the compounds. After fil tration, the dichloromethane was evaporated by aspiration. The remaining caffeine was then sublimed. After sublimation, 0.01 g of caffeine was recovered. A percent yield of 0.98% was determined, which may have been inf luenced by chemical decomposition. ...

  • 4 Pages

    CaffeineExtractionLabnew

    El Paso CC, SPOT 241

    Excerpt: ... Extraction of Caffeine from Tea Leaves Introduction The active ingredient that makes tea and coffee valuable to humans is caffeine. Caffeine is an alkaloid, a class of naturally occurring compounds containing nitrogen and having the properties of an ...

  • 4 Pages

    CaffeineExtractionLab1

    El Paso CC, SPOT 241

    Excerpt: ... Extraction of Caffeine from Tea Leaves Introduction The active ingredient that makes tea and coffee valuable to humans is caffeine. Caffeine is an alkaloid, a class of naturally occurring compounds containing nitrogen and having the properties of an ...

  • 4 Pages

    CaffeineExtractionLab1

    El Paso CC, SPOT 241

    Excerpt: ... Extraction of Caffeine from Tea Leaves Introduction The active ingredient that makes tea and coffee valuable to humans is caffeine. Caffeine is an alkaloid, a class of naturally occurring compounds containing nitrogen and having the properties of an ...

  • 1 Pages

    readme

    TCU, BJONES 20263

    Excerpt: ... pp-lecture The PowerPoint slides in this folder are designed to be used to support lectures on the textbook contents. They include the text figures plus bulleted lists and other slides that reflect the narrative. Some instructors choose to post the ...

  • 1 Pages

    StudyGuideS08C

    Illinois Tech, MATH 149

    Excerpt: ... <STUDYGUIDES08C.TXT> {5-9-2008} Math 149 Spring 2008 Final Study Guide, Part III - Chapter 6 Concept Check, p. 378: 1,2,3,4,5 Exercises: 1-6, 7-11, 12-16 Chapter 9 Concept Check, p. 598: 1 Exercises: 1, 3a, 7 ...

  • 1 Pages

    caff2

    Missouri S&T, CHEM 224

    Excerpt: ... Caffeine Extraction Part 2: Micro Vacuum Sublimation of Caffeine Sublimation of Caffeine WS/2007 You may want to test the procedure using a sample of pure caffeine first, in order to observe the sublimation, before attempting the sublimation on your extracted caffeine sample. Preheat the hotplate/Al block to about 200 oC. Put some ice and salt into a beaker. Assemble the sublimation apparatus shown below with your crude caffeine in the 5 ml conical vial. Install a trap between the apparatus and the aspirator. Turn the water on full and make sure you are getting a vacuum and all joints have good tight seals. Place some cold water from the ice/salt mixture into the thistle tube condenser with a long pipet so that the small stem is filled with fluid. To begin sublimation, lower the sublimation apparatus into the preheated hot Al block and look for deposition of caffeine on the tip of the cold finger condenser. Sublimation should be complete in 1-5 min. You may want to add fresh cold ice/salt to the stem of the ...

  • 5 Pages

    Chem 243a - Isolation of Caffeine from Tea or C...

    Arizona, CHEM 243a

    Excerpt: ... the cold finger. Additionally, it is quite possible that the vapors, due to the lowered pressure, became superheated (denaturing them). Overall, the techniques involved within the process of sublimation proved to be extremely critical. In order to increase the yield of pure caffeine throughout the duration of the experiment, additional separations by centrifuge should have been employed. These additional separations would have maximized the amount of caffeine extraction from the tea. It could also have been beneficial to add colder material into the cold finger (such as dry ice) to ensure that sublimation would occur within the apparatus. V. Questions 3. Sodium sulfate was used to remove polar/excess water without drying out the sample as well as prevent binding and other interactions 5. Sublimation is the process in which a solid is evaporated into a gas without a liquid phase. 6. It was important to add the ice water to the cold finger after the vacuum was applied in order to prevent condensation. T ...

  • 1 Pages

    StudyGuideS08A

    Illinois Tech, MATH 149

    Excerpt: ... <STUDYGUIDES08A.TXT> {5-5-2008} Math 149 Spring 2008 Final Exam Study Guide, Part I - Chapter 3 Review Concept Check, p. 196: 1 - 11 True-False Quiz, p. 196. Exercises: 10,11 & 12-40 - Chapter 4 Review Concept Check, p. 281: 1,2,3,4,5,6, ...

  • 3 Pages

    howcoffeeisdecaffeinated

    SUNY Geneseo, CHEM 118

    Excerpt: ... unds, most notably caffeine. For the extraction process, the carbon dioxide in supercritical form is forced through green coffee beans. Its gas-like behavior allows it to penetrate deep into the beans, and it dissolves 97-99% of the caffeine present. After either method, the coffee beans are re-submerged in the caffeine free substance where they reabsorb their flavor. A drink is referred to as truly decaffeinated if the caffeine level remains lower than 2.5 percent. Extraction of caffeine from coffee and other caffeinated beverages is a costly operation and some of coffee's most tasteful and distinct flavors may be lost or changed throughout the process. The conclusion of such caffeine extraction and separation is catalyzed by the enzyme caffeine synthase. Although in the present coffee consuming society this process of making decaffeinated coffee appears to be successful, research is currently working on new, improved, and quicker methods of removing caffeine or even inhibiting the gene in tea and coffee pla ...

  • 1 Pages

    Moldau Lesson Plan 1

    Penn State, MJH 5156

    Excerpt: ... LessonPlan Date:_ Goals:Focus Topic ToneProduction Objectives Studentswillbeableto playinslurredsections usingenoughbowto produceagoodtone. Techniques&Activities Demonstratecorrectbow usageandhavestudentsplay slurredpassageusingas muchbowasyou.S ...

  • 1 Pages

    mid-guide07

    Washington, ARCHY 105

    Excerpt: ... Archy 105. Study-Guide for Mid-Term Exam The mid-term exam, next Tuesday, will be based on all of the material covered so far in this course in lecture-class, in videos, in sections, in web-quizes, and in the assigned readings. Lecture-notes (which ...

  • 3 Pages

    socraticguide

    Maryville MO, Q 370

    Excerpt: ... Socratic Seminar "The Socratic method of teaching is based on Socrates' theory that it is more important to enable students to think for themselves than to merely fill their heads with "right" answers."* Some Guidelines for Participants in a Socratic ...

  • 1 Pages

    StudyGuideS08B

    Illinois Tech, MATH 149

    Excerpt: ... <STUDYGUIDES08B.TXT> {5-7-2008} Math 149 Spring 2008 Final Exam Study Guide, Part II - Chapter 7 Concept Check, p. 482: 1,3,5e,5f,5g True-False Quiz, p. 483: 1,2,3,4,13,14 Exercises: 1,2,3,4,9,12b,19,20,32,35,40,56,79,80,92,96 Chapter 5 Conc ...

  • 4 Pages

    Extraction of Caffeine from Tea

    Northeastern, CHM 211

    Excerpt: ... Michael Chelala TA: Jaylene Ollivierre Date of Experiment: 9/17/2007 Submission Date: 9/24/2007 Extraction of Caffeine from Tea Objective: The objective of this experiment is to extract the chemical compound caffeine from a natural source; which in ...

  • 3 Pages

    Isolation of Caffeine from Tea and Thin Layer C...

    Stonehill, CH 221

    Excerpt: ... Isolation of Caffeine from Tea and Thin Layer Chromatography of Analgesic CH221 Lab 19 February 2008 Introduction The primary objective of this lab was to isolate caffeine from tea with dichloromethane and to purify the caffeine by means of sublimati ...

  • 5 Pages

    IR absorptions

    UCSD, CHEM 143A

    Excerpt: ... keep reacting We using drying agents to remove final traces of water from organic fractions H2SO4 in fisher esterfication catalyzes back reaction, shifts equilibrium and catalyzes forward reaction Caffeine Extraction CO2 is a good solvent for caffeine extraction because it is a non polar solvent due to its net dipole Distillation during a simple distillation the tempurature of solution is constantly increasing During fractional distillation the temperature of the solution does not change until the first component is completely removed. Distillation is heating liquid to BP and converting liquid to vapor and back to condensate. Purpose is to separate liquids of 2 different volatilities Partial pressure= mole fraction x vapor pressure of pure compound Eventually, vapor that condensates at top of the column is pure or enriched in the more volatile and pure form. Also the condensate that has returned to the distillation flask is pure or enriched in less volatice compound ...