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Applied science, unit 8c, biology: digestive system practical write up $10.02   Add to cart

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Applied science, unit 8c, biology: digestive system practical write up

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This is the write up for the practical that I created . It up to distinction level. graded my teacher

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  • June 25, 2023
  • 10
  • 2022/2023
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Biology practical report

Iodine test to determine starch content
Use: it is use to determine if there is start present

Equipment:
 Iodine
 Safety googles
 Gloves
 Lab coat
 Spatula
 Stotting tiles


Foodstuff to be identified
 Sugar
 Egg powder
 Apple
 Potato
 Soup mix
 Porridge oats

Health and safety
 Place all bags and coats out of place or away from the experiment
 Always wear your gloves, safety googles and lab coat.
 Tie your hair back


Method
I used a spatula to place the 6 individual food stuff into separate wells in the spotting tile. I then
add around 3 droplets of iodine to each of the samples wells then observed the colour change. the
colour will change from orange/ to black if starch is present




Iodine test for starch
Food sample Colour change observed Results(positive/
negative)

, sugar No colour change (stayed orange) negative
egg powder No colour change (stayed orange) positive
apple No colour change (stayed orange) negative
potato Orange - black negative
Soup mix Orange - black positive
Porridge oats Orange - black negative




Biuret test for protein
Use: it tests if there is a presence of protein
Equipment
 Pipette
 Biuret solution
 Distilled water
 Test tube
 Lab coat
 Gloves
 Safety goggles
 spatula

Foodstuff to be identified
 Sugar
 Egg powder
 Apple
 Potato
 Soup mix
 Porridge oats


Health and safety
 Place all bags and coats out of place or away from the experiment
 Always wear your gloves, safety googles and lab coat.
 Tie your hair back

Method
I used a spatula to add a tiny amount of the 6 sampled foodstuffs to place into a correctly labelled
test tube. I filled ¼ of each test tube with water then added 1 pipette full of biuret solution and
mixed steadily. I observed the colour change, if the sample change from blue to lilac then there is
protein present.




Food Colour change observed Result (positive/negative
Sugar No colour changes (stayed blue) Negative
Egg powder Blue to lilac Positive
Apple No colour changes (stayed blue) Negative

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