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food tests (benedict's test to test for sugars (3) add some…
food tests
benedict's test to test for sugars
3) add some benedict's solution to the test tube about 10 drops using a pipet
4) place the test tube in the water bath using a test tube holder and leave it in there for 5 minutes make sure the tube is pointing away from you
2) prepare a water bath so that its set for 75.c
5) if the food sample contains a reducing sugar the solution in the test tube will change from the normal blue colour to green yellow or brick red depending on how much sugar is present
1) prepare a food sample and transfer 5cm3 to a test tube
prepare your food sample first
2)transfer the grounded food to a beaker and add some distilled water
3) give it a good stir with a glass rod to dissolve some food
1)get a piece of food and break it up using a pestle and mortar
4) filter the solution using a funnel lined with filter paper to get rid of the solid bits of food
use the biuret test to test for protein
2) add 2 cm 3 of biuret solution to the sample and mix the contents of the tube by gently shaking it
3) if some of the food sample contains protein the solution will change from blue to pink or purple if no protein is presented the solution will stay blue.
1) prepare a sample of your food and transfer 2cm3 of your sample to a test tube
sudan III test for lipids
2) use a pipette to add 3 drops of Sudan III stain solution to the test tube and gently shake the tube
sudan III stan solution stains lipids if the sample contains lipids the mixture will separate into two layers top being bright red if no lipids are present no red layer
1) prepare a sample of the food you're testing transfer about 5cm 3 into a test tube
use iodine solution to test for starch
make a food ample and transfer 5cm3 of your sample to a test tube
then add a few drops of iodine and gently shake the test tube to mix the contents if the sample contains starch the colour of the solution will change from brownie orange to black or blue black