IODINE TEST FOR STARCH The Iodine test is used to test for the presence of starch. Iodine solution — iodine dissolved in an aqueous solution of potassium iodide — reacts with the starch producing a purple black color. The colour can be detected visually with concentrations of iodine as low as 0.00002M at 20°C. However the intensity of the colour decreases with increasing temperature and with the presence of water-miscible‚ organic solvents such as ethanol. Also the test cannot be done at very low
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are the only foods derived from animals that contain a significant amount of carbohydrates. Carbohydrates are divided into two groups‚ simple carbohydrates and complex carbohydrates. Simple carbohydrates‚ sometimes called simple sugars‚ include fructose (fruit sugar)‚ sucrose (table sugar)‚ and lactose (milk sugar)‚ as well as several other sugars. Fruits are one of the richest natural sources of simple carbohydrates. Complex carbohydrates are also made up of sugars‚ but the sugar molecules are
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of carbohydrates GroupPropertiesExamples Monosaccharides general formula:(CH20)n(n = 3 to 0)Small molecules with low molecular mass; sweet tasting; crystalline; readily soluble in water.Trioses‚ e.g. glyceraldehyde (C3H603)Hexoses e.g. glucose‚ fructose (C6H12O6) Disaccharides general formula:2[(CH2O)n] - H2OSmall molecules with low molecular mass; sweet tasting; crystalline; soluble in water‚ but less readily than monosaccharides.Sucrose‚ maltose‚ lactose‚ all with the general formula C12H22O11
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Objective: 1) To test the presence of reducing sugars which is glucose in the Benedict’s test. 2) To test the presence of non-reducing sugars which is sucrose by using Hydrolysis then Benedict’s test. 3) To test the presence of the starch by using iodine test. 4) To test the presence of lipids in corn oils when using the Sudan Ш and Emulsion tests. 5) To test the presence of proteins in an egg albumen in the Biuret’s test. 6) To test the presence of Vitamin C and ascorbic acid in the DCPIP
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experimental results. 6) To learn the meaning of some scientific terms used in experiments. Materials: (as projected on screen) Method/ Procedure: I. CARBOHYDRATES: REDUCING SUGARS The reducing sugars include all monosaccharides‚ such as glucose and fructose‚ and some disaccharides‚ such as maltose. Test Benedict’s test Add 2cm3 of a solution of the reducing sugar to a test-tube. Add an equal volume of Benedict’s solution. Shake and place into boiling water. Boil for 2-5 minutes; shake continuously
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Lab 04: Sugar Respiration in Yeast Sugars are vital to all living organisms. The eukaryotic fungi‚ yeast‚ have the ability to use some‚ but not all sugars as a food source by metabolizing sugar in two ways‚ aerobically‚ with the aid of oxygen‚ or anaerobically‚ without oxygen. The decomposition reaction that takes place when yeast breaks down the hydrocarbon molecules is called cell respiration. As the aerobic respiration breaks down glucose to form viable ATP‚ oxygen gas is consumed and carbon
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Introduction: Tolerance is the most necessary quality of man. Tolerance is one of the conditions of good manners. Intolerance leads to the worst disaster. So‚ we put so much importance on tolerance. Vices of intolerance: Intolerance leads to the worst kinds of disaster. In the mythology and history we can find many horrible acts of intolerance. Cain killed his elder brother Able‚ because he could not bear the importance of Able in the eye of God. The Catholic queen Mary of Great Britain burnt
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people tend to reject those who are different. In the novel To Kill a Mockingbird‚ Harper Lee presents a number of situations that reveal the effects of intolerance on other people’s lives. The characters in the novel who were treated with a lack of intolerance were Boo Radley‚ Atticus Finch and Tom Robinson. By observing the effects of intolerance on people’s lives‚ the children gain sympathy‚ respect and understanding for its victims. <br> <br>The children gain sympathy for Boo Radley when they observe
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decrease in glucose levels as it is being absorbed. However‚ people who don’t properly digest lactose will not see a rise in glucose levels because lactose remains intact. *Look at picture in notes for a visual representation* 5. Define Lactose intolerance. What symptoms are associated
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K.R. Essay The Sexual Intolerance in Lithuania The gays’ procession in Vilnius on the 8th of May was the most discussed event which received many responses not only from the EU institutions‚ our government‚ but also from other high rank politicians and the mass media in many countries. The strong will to forbid such unprecedented an action in Lithuania of President Dalia Grybauskaite and other politicians as well as our
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