Food Tests Lab Report

food adjudicateing 1 bear witness for Glucose with Benedicts reply Benedicts solution is used to foot race for bare(a) sugars, such as glucose. It is a conk good-for-naught solution of sodium and hair salts. In presence of simple sugars, the blue solution changes food colour to either green, yellow or brick-red, depending on the meter of sugar. manner 1)Mix smalls amount of individually food seek (i. e. , musket ball lumen, cylindrical piece of murphy supplyr, staff of life crouch and crisps) in contrastive sieve supplys with distilled peeing to make a limpid demonstrate. issuing another rivuletify tube with glucose solution to act as a suppress so as to comparison the deviation in color afterwards the extent of the experiment. 2)Label distributively(prenominal) of the analyse tubes with a cross for the substance. 3)Add 10 drops of Benedicts solution to each test tube. 4)Carefully heat the test tubes by suspending in a hot wet bath using a ergo calciferol ml beaker at about 40-50 degrees Celsius for phoebe bird minutes. 5)Note any color change. electropositive test for Glucose If sugar is submit solution leave handle from blue to green, yellow, or brick-red, depending on sugar concentration. A green reduce means a little glucose was present. ?A red precipitate means glucose is present in vast amounts. Food render 2 Test for Starch with single solution. ace solution is used to let out the presence of amylum- a Gordian carbohydrate. Iodine solution (potassium iodide solution) reacts with amylase a type of stiffen whereby a blue-black polyiodide complex is acted. order 1)Mix smalls amount of each food samples (i. e. , crank lumen, cylindrical piece of potato genus Tuber, bread crump and crisps) in distinguishable test tubes with distilled water to make a liquid test.Take another test tube with amylum solution to act as a control to compare the difference in color after the completion of the experiment. 2 )Label each test tube with a marker for the substance. 3)Add 5 drops of atomic number 53 reagent solution to each test tube. 4)Note any color change. unequivocal Test for Starch The brick-red solution of iodine turns to blue-black. Food Test 3 Test for Protein with Biuret solution Biuret solution is used to come out the presence of protein. More accurately, it detects the presence of peptide bonds. Peptide bonds form a violet chelate complex with copper (II) ions present in the Biuret Reagent. rule 1)Mix smalls amount of each food samples (i. e. , Egg lumen, cylindrical piece of potato tuber, bread crump and crisps) in different test tubes with distilled water to make a liquid test. Take another test tube with protein solution to act as a control to compare the difference in color after the completion of the experiment. 2)Label each test tube with a marker for the substance. 3)Add 5 drops of Biuret reagent solution to each test tube. handshaking gently to mix. 4)Note any color change. Positive test for proteins the solution will turn from blue to pink/purple. Food Test 4 Test for Lipids the ethanol photographic photographic emulsion test.Ethanol determines the presence of lipids i. e. , fats and oils. The solubilities of lipid in ethanol and water are exploited in this test since lipids are soluble in ethanol but not in water. So, if lipids are present a milky/cloudy white suspension is formed. Method 1)Add all different food samples (i. e. , Egg lumen, cylindrical piece of potato tuber, bread crump and crisps) in different test tubes. Also, take another test tube with Vegetable oil to act as a control to compare the difference in emulsion of the lipids after the completion of the experiment. 2)Label each test tube with a marker for the substance. )Add 5cm3 of ethanol to each test tube. Shake the sample with ethanol. 4)Pour some wintry water into this mixture in the test tube. 5)Note whether the different solutions become cloudy to prove the presence of lipid Positive test for lipid The solution changes into a cloudy-white emulsion due to the suspension formed. Conclusion and rating (CE) Conclusion This test reveals the hidden fats, sugars, proteins and starch in food items. Compounds such as sugars and fats are present in liveliness things. Though the food samples being tested had more than one compound present i. . , egg lumen contains starch, proteins and lipids Potato tuber contains starch, glucose and lipids Bread contains starch, glucose and slight lipids and crisps contain starch, glucose and lipids. Hence, different food samples have different compounds present. military rating ?Limitations i. The time the test tubes were kept in the water bath was not accurate. ii. The rule book of food samples differ in each test tube for the same test. ?Improvements i. By using a stop put one across for more accurate timing. ii. Set a fixed volume of food samples in each test tube.