Iodine Test for Starch Introduction and Hypothesis: In this experiment‚ we used iodine to test for starch in certain solutions. Iodine separates starch from polysaccharides‚ monosaccharides‚ and disaccharides. Starch is a curled polymer of glucose and iodine interacts with molecules‚ which changes the color of the molecules to a kind of black color. Iodine does not respond with carbohydrates that are not curled or coiled‚ thus the color stays yellowish brown. A black color result means that starch
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Carbohydrates‚ Proteins‚ lipids‚ and nucleic Acid Lab Exercise 6 Date: 9/17/12 Bio 102-11 Purpose the purpose of this experiment was to perform test to detect the presence of carbohydrates‚ proteins‚ lipids‚ and nucleic acids. Explain the importance of a positive and a negative control in biochemical test. Use biochemical test to identify an unknown compound. Background Most organic compounds in living organisms are carbohydrates‚ proteins‚ lipids‚ and nucleic acids they are called macromolecules
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reagent should be negative and is not a protein. In the second experiment to test for glucose with the Benedict reagent sugar should be positive for glucose. Starch mixed with the Benedict reagent is probably positive for glucose because it is a polysaccharide. Onion juice mixed with Benedict reagent is probably positive for glucose because it is a fructose. Distilled water with Benedict reagent should be negative for glucose. The third experiment to test for starch using with and without the IKI
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11/12/07 1. Background Organic compounds are‚ by definition‚ any chemical compound containing carbon. These compounds include carbohydrates‚ polysaccharides‚ lipids‚ proteins‚ and nucleic acids. Each one of these compounds has a different purpose. Carbohydrates give energy to cells when consumed. Lipids are basically the fats of a cell. Proteins are the building blocks of muscle in a cell. Nucleic
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(test for starches)‚ emulsion test and the biuret test. Carbohydrates include reducing and non-reducing sugars also starches. They have a general Formula of CnH2nOn.They can be classified into three main groups‚ Monosaccharide‚ Disaccharide and polysaccharide. Carbohydrates have many uses such as: for energy‚ for storage of food in both plant and animal cells e.g. Starch‚ chloroplasts‚ for structure in plant cells e.g. cellulose have a structural use in plant cell walls giving it structure. Carbohydrates
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test as the colour of solution change from yellow to dark blue. Glucose is the simplest carbohydrates that are monosaccharide or simple sugar. Starch consisting of a large number of glucose units joined together by glycosidic linkage and known as polysaccharide‚ that is polymers of sugar. Saliva that contains salivary amylase enzyme‚ which breaks down the glycosidic linkage between glucose that found in starch and hydrolyzes starch into glucose at optimum temperature of 37°C‚ that is similar to human
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222–224. Struszczyk‚ M.H. Global requirements for medical applications of chitin and its derivatives. In Polish Chitin Society‚ Monograph XI; Polish Chitin Society: Łódź‚ Poland‚ 2006; pp J. Chem. Educ. 1990‚ 67‚ 938. Atkins‚ E. Conformations in polysaccharides and complex carbohydrates. J. Biosci. 1985‚ 8‚ 375–387. Linnaeus wings. Mater. Sci. Eng. C 2009‚ 29‚ 1370–1374. Rudall‚ K.M.; Kenchington‚ W. The Chitin System. Biol. Rev. 1973‚ 48‚ 597–633. Minke‚ R.; Blackwell‚ J. The structure of [alpha]-chitin
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Macromolecules in Food INTRODUCTION The most common macromolecules found in living organisms are lipids‚ carbohydrates‚ proteins‚ and nucleic acids. (Hillis et al 2011). Macromolecules are normally containing two or more monomers in them and their main functions are to store energy. Starch is a huge molecule made up of hundreds of simple sugar molecules (such as glucose) connected to each other. Most foods are known to be combinations of macromolecules. METHODS The tests performed were iodine
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Date: 2/27/2013 Title: To test for starch Aim: To test certain foods to see if they contain starch Materials: foods containing starch‚ iodine‚ potassium iodine‚ water‚ Benedict’s solution Equipment: test tubes‚ test tube racks‚ water baths (boiling)‚ eye protection Method: 1) Two to three drops of the iodine were dropped in the potassium iodine solution to 2cm cube of the starch suspension. 2) Then a suspension was made up of the foods by mixing it with water. 3) Then two to three
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Macromolecules of Life Exercise 1: Testing for Proteins In this experiment Biuret Color is added to four substances‚ egg white‚ pepsin‚ sugar‚ and distilled water to test the detection of protein in each substance. Substance Tested Predicted Results Biuret Color & Number of drops added 1. Egg White Change color 5 drops –turned a yellow/light brown 2. Pepsin Change color 5 drops- turned purple 3. Sugar No Change 5 drops-no change in color 4. Distilled Water No Change 5 drops-no
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