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Identification Of Biologically Important Chemical Compounds Sep 20 By Kristian Atkinson IB StOlav vgs Stavanger Norway Introduction All living organisms are made of cells and these cells have three main parts The center is the nucleus represented by the coloured marble Inside the nucleus are chromosomes which carry the genetic information of the organism The cell membrane is a protective barrier and filters such things as nutrients waste products water and oxygen in and out of the cell Changes occur in the membrane to adapt to the cells needs This ability is called metabolism Proteins fats and starch are all various constituents of food Tests to show the presence of these substances can easily be preformed in the laboratory usually with a specific colour end point Part 1 Equipment Starch powder water iodine solution pepsin solution dilute sodium hydroxide NaOH 1 copper sulphate solution Oil ethanol gas burner test tubes Aim To try test solutions for starch fat and protein Method Starch We had shuck a little starch powder in a test tube together with cold water The solution had then been boiled until it was clear When the solution was cold we added 3-4 drops of iodine solution Protein We added 5cm of dilute sodium hydroxide and 5cm of 1 copper sulphate solution to a solution of pepsin protein solution Fat 2cm of oil and 5cm of ethanol was put in a test tube and mixed thoroughly until all the oil was dissolved Finally we added 5 cm of water and shuck the test tube gently Results We observed changes in all the three test tubes The changes in starch and protein occurred directly after we had finished with the methods above and the reaction in fat occurred only 1-2 min later The results of the different solutions are listed below Starch After
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