Transcription of Home / Biology / Humans as organisms / Nutrition and ...
1 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.
2 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. Leave to stain round the sample when held up to the lightNow try a Test BitePreviousAbout the BBC | Help | Terms of Use | Privacy & Cookies Policy
