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BBC - GCSE Bitesize - Biology | Humans | Food of 212/2/2005 11:38 AM home / Biology / Humans as organisms / Nutrition and digestionBiologyBiologyThe human BodyExplore your body parts!Win a 15 MusicVoucher on Bitesize interactiveFood testsWe eat many complex foods which contain mixtures of carbohydrates, fats and proteins. Foodtests enable you to find out what food types a food fats the test is simply to squash a sample of food onto a piece of paper and leave it to dry. A positive test for fat is a translucent stain around the food sample when you hold the paper up to the the other food types, first prepare a sample of food for testing:Crush some food in a pestle and a spatula-full to a boiling 5cm3 of distilled water and to boil and simmer for 1 and add the test need to know the different tests for starch, sugars and forReagentPositive testCarbohydrates - starchDilute iodineTurns blue-blackCarbohydrates - glucoseBenedict's solutionOrange/red precipitateCarbohydrates - sucroseA few drops of dilute HCl acid + a few drops of Benedict's solutionOrange/red precipitateBBC - GCSE Bitesize - Biology | Humans | Food of 212/2/2005 11:38 1 2 3 4 5 6 7 PrintTest forReagentPositive testProtein Biuret test - add a few drops of dilute copper sulphate solution, followed by a few drops of sodium hydroxidePurple or violet precipitateFatRub a food sample onto a piece of paper.
Title: BBC - GCSE Bitesize - Biology | Humans | Food tests Author: Michelle Hall Created Date: 12/2/2005 11:39:22 AM
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Testing for Sugars and Starch, Kingsborough Community, Testing for sugar/starch in, Starch, Dissolution Testing, Dissolution, Don’t Guess, Test your hay, PERNAL CARE, Combustible Dust Basics, International Tables of Glycemic Index, BIOCHEMICAL CHARACTERIZATION OF THERMOPHILIC, Biochemical characterization of thermophilic amylase enzyme