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Use appropriate chemical tests to identify different dietary nutrients

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´╗┐Unit 11- Physiology of Human Body Systems P5 - Use appropriate chemical tests to identify different dietary nutrients Minerals Biochemical test Positive results Why are they needed and the implications without them Starch The easiest way to test for starch is by adding an Iodine or potassium iodide solution. This is commonly used on bread. The iodine or potassium iodide solution will colour of the bread from brown to black. Starch influences the speed at which glucose is digested in the body. Starch converts into sugar and provides cells with energy. However if the cells do not require that energy, it is stored and used at a later time. Excess amounts of starch would turn into fat. Without a healthy supply of starch people would get tired and sluggish, due to the lack of energy in their body. ...read more.


Sucrose is used in the body to make glucose. This process occurs in the liver where the sucrose is then split by hydrolysis. Like sugar they are used to provide energy to the cells. Without sucrose there could be a lower amount of glucose made. This can result in tiredness and potentially fainting. Lipids Ethanol is used to check for any lipids found in food. Once the ethanol is added, it would need to be shaken to reduce any fats. Once that process has finished the ethanol would need to poured into a test tube containing water. A white emulsion of fats should be present on top of the water. Lipids regulate the amount of fats in the body. These fats are then used as energy. Lipids also provide essential vitamins, regulate hormones and enzymes and protect the body. ...read more.


Vitamin C deficiency would result in muscle and joint pains, easy bruising and tiredness. Gums may also start bleeding and swelling. Vitamins and Minerals A clean nichrome wire would need to be dipped in nitric acid and then placed on a Bunsen burner. The burner would need to be on its maximum heat setting and when there is no colour of the flame the nichrome wire has been removed of any contaminants. The wire would then need to be dipped in the food that it is being test. It is then placed on the Bunsen burner. The colours made are due to the minerals present in the food. The presence of potassium will produce a lilac flame. Calcium is present if the flame produces a red colour. If the flame is orange or yellow then sodium is present. Vitamins and minerals are split into a wide variety of beneficial substances. They ensure the body is functioning well. A deficiency in any of these would result in unhealthy development and poor cell function. Reference http://www.pearsonschoolsandfecolleges.co.uk/Secondary/Science/BTECAppliedScience/BTECLevel3NationalAppliedScience/Samples/StudentBook/BTECLevel3NationalAppliedScienceStudentBookUnit11.pdf http://www.ehow.com/how-does_4728406_sugar-affect-human-body.html#ixzz2K7KIoTsV http://www.ehow.com/about_4571150_does-vitamin-c-do-body.html#ixzz2K7QKUAsS ...read more.

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