lc biology mandatory experiments food test bio
About this set
Created by:
reckdun on March 6, 2012
Subjects:
Description:
lc bio unit 1 mandatory experiments
Classes:
fifth year biology class 2012-2013, first year sc 2012, leaving cert biology
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27 terms
Terms | Definitions |
|---|---|
 protein test add an equal volume of | 10% sodium hydroxide and 1% copper sulphate |
| Positive test for protein | purple |
| negative test for protein | light blue |
| Test for reducing sugar | Benedict,s or Fehlings 1 and 2 and gently heat |
| Test for glucose (reducing sugar) | Benedict's solution then place in boiling water for 10 minutes |
| positive test for glucose | brick red |
| negative test for glucose | blue |
| test for starch also add | few drops of dilute iodine |
| positive test for starch | blue black |
| negative test for starch | red-yellow |
| control for protein, glucose and starch | use an equal volume of distilled water as the sample |
| test for lipids | use brown paper |
| positive result for lipids | translucent grease spot |
| D.C.P.I.P | di chloro phenol indo phenol used to test for vit c |
| positive test for vit c | blue colour dissappears |
| negative result for vit c | blue colour persists |
| emulsion test | Test Confirms the presence of lipids, relies on the fact that lipids are soluble in ethanol and insoluble in water forming a cloudy suspension |
| Biuret test | for proteins; biuret solution initially blue, mix with proteins will cause a change to violet. Example foods: Beef, dairy, fish, peanuts |
| will benedicts work for sucrose | no it is not a reducinng sugar |
| which test requires heat | reducing sugar test Benedicts or Fehlings |
| what solution makes a suitable control | distilled water |
| what is the purpose of a control | to make a comparison to prove whether the experiment was proven or not |
| food solution suitable for protein test | milk or albumen egg white |
| food suitable to show the presence of fat | olive oil or butter |
| food suitable to show the presence of starch | potato cream cracker |
| food suitable to show the presence of vitamin C | kiwi, orange, black currant |
| Benedict's solution doesn't work for sucrose why? | it is not a reducing sugar |
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