BEHAVIOUR OF AMINO ACIDS IN SOLUTION Abstract In this practical the acid-base behaviour of amino acids was assessed. Amino acids are amphoteric. They have the basic (amine) and the acidic (carboxylic) functional groups. These show the same type of equilibrium reactions that all weak acids and bases undergo‚ and the relative amount of each can be altered by adjusting the pH of the solution. For this practical glycine was used as a model to show this unique nature of amino acids. A series of
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Introduction Extraction is a purification technique used in organic chemistry to separate compounds from a mixture of two or more compounds. There are three different extraction techniques: liquid-liquid extraction‚ solid-liquid extraction and chemically active extraction. All three types of extraction follow the same principle. Organic molecules dissolve in organic solvents and polar molecules dissolve in aqueous solvents. This phenomenon is observed because of the intermolecular forces between
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LEE ET AL.: JOURNAL OF AOAC INTERNATIONAL VOL. 88‚ NO. 5‚ 2005 1269 DIETARY SUPPLEMENTS Determination of Total Monomeric Anthocyanin Pigment Content of Fruit Juices‚ Beverages‚ Natural Colorants‚ and Wines by the pH Differential Method: Collaborative Study JUNGMIN LEE U.S. Department of Agriculture‚ Agricultural Research Service‚ Pacific West Area (PWA)‚ Horticultural Crops Research Laboratory Worksite‚ 29603 University of Idaho Ln‚ Parma‚ ID 83660 ROBERT W. DURST and RONALD E. WROLSTAD Oregon
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Serina Pooja Sowman | Practical 7: Determination of Hardness in Water | | | | | 10/3/2012 | | Aim: To determine the different types of hardness and alkalinity found in the water by titration methods. This is used to calculate the concentrations of calcium and magnesium found in the water. Principles: The hardness of water is determined to provide a measure of the quality of water for household and industrial use. Hard water is not a health hazard. Drinking hard water
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AMINO ACIDS BY MEANS OF TITRATION CURVE ABSTRACT The aim of the experiment was to identify an unknown amino acid through acid-base titrations which was prepared in water to form an acidic solution. Each group prepared unknown amino acid hydrochloride. The pre-prepared basic solution was slowly added to the amino acid solution and pH change was closely observed using the pH meter. During these titrations the amino acid converted from cation to zwitterion to anion; zwitterion is an amino acid with
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BENZOIC ACID & BENZOATES (210 –218) • Retards growth of bacteria and yeasts • Occurs naturally in many foods – a similar distribution to salicylate (but at a lower dose than as an additive) • Common food sources: Soft drink‚ cordial‚ fruit juice and cider Liquid essences and syrups Iceblocks‚ jelly‚ low joule jam‚ dips‚ pickles‚ olives Fish marinades and preserves • PABA (para-amino-benzoic-acid)
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WAS HITLER A WEAK DICTATOR? Introduction The question of whether Hitler was master in the Third Reich or a weak dictator’ is one of the central debates amongst historians of Nazi Germany. It is not necessary to spend too much time here outlining the debate‚ as this information can easily be found elsewhere (see‚ for example‚ the excellent chapter on this subject in Ian Kershaw’s The Nazi Dictatorship). Broadly speaking‚ historians who have participated in this debate can be located on a scale
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structures and properties of amino acids know the groups of amino acid What are amino acids? Amino acids are molecules that when combined with each other proteins. Amino acids contain a central tetrahedral carbon atom (α-carbon) amine group‚ carboxyl group‚ R-side chain The R-side chain determines the different amino acids There are 20 common amino acids Amino acids can join via peptide bonds Several amino acids occur only rarely in proteins Some amino acids are not found in proteins 3D
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and these comprise only 20 kinds of amino acids in various combinations. These 20 kinds of amino acids are essential to the body. In addition to being the materials for proteins‚ they are used as an energy source for the body as necessary. Further‚ each amino acid plays an important and unique role in the body. The list below shows the role of each amino acid. | Valine Leucine Isoleucine | All of these 3 amino acids are called branched chain amino acid(BCAAs). They perform the important functions
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AMINO ACIDS SUSMITA DAS SWAPNA MONDAL OBJECTIVES To study about Amino acids. To study the classifications of amino acids based on different headings. To study the functions of amino acids. INTRODUCTION Amino acids:• Amino acids are monomers of protein. • Amino acids are group of organic compounds which contain two functional groups. One is Amino group(NH2) and the other is Carboxyl group(COOH). • Proteins are broken down into amino acids on hydrolysis. • Each amino acid also have a
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