Food Tests
- Created by: zoolouise
- Created on: 15-01-16 21:46
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- Food Tests
- Reducing Sugars
- Add 2cm^3 of the food sample in a test tube, add an equal amount of Benedict's reagant and heat for 5 minutes.
- Negative - Blue
- Positive - Green/Yellow/Orange/Red
- Add 2cm^3 of the food sample in a test tube, add an equal amount of Benedict's reagant and heat for 5 minutes.
- Non-Reducing Sugars
- Heat 2cm^3 of the food sample with a few drops of hydrochloric acid, add an equal volume of Benedict's reagent and heat for 5 minutes.
- Negative - Blue
- Positive - Green/Yellow/Orange/Red
- Heat 2cm^3 of the food sample with a few drops of hydrochloric acid, add an equal volume of Benedict's reagent and heat for 5 minutes.
- Starch
- Add 2cm^3 of the food sample to a test tube, add 5 drops of iodine solution.
- Negative - Brown/Orange
- Positive - Blue/Black
- Add 2cm^3 of the food sample to a test tube, add 5 drops of iodine solution.
- Lipids - Emulsion
- Add 2cm^3 of food sample to a test tube, add 5cm^3 of ethanol to the test tube, shake thoroughly, add 5cm^3 of water to the test tube, shake gently
- Positive - Cloudy/White
- Negative - Clear
- Add 2cm^3 of food sample to a test tube, add 5cm^3 of ethanol to the test tube, shake thoroughly, add 5cm^3 of water to the test tube, shake gently
- Proteins - Biuret test
- Add 2cm^3 of the food sample to a test tube, add 2cm^3 of sodium hydroxide to the test tube, add a few drops of copper(II) sulphate solution to the test tube
- Negative - Blue
- Positive - Purple
- Add 2cm^3 of the food sample to a test tube, add 2cm^3 of sodium hydroxide to the test tube, add a few drops of copper(II) sulphate solution to the test tube
- Reducing Sugars
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