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| style="height:20px; width:300px; text-align:center;" |This [[Biuret]] has turned purple, indicating protein is present.
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==Key Stage 4==
===Meaning===
Biuret solution is a solution which can be used to test for [[protein]].
=====Method=====
: 1. Take a small sample of food and dissolve it in water.
: 2. Add some [[Biuret]] to the solution.
: 3. If it turns from blue to purple then the food contained [[protein]].
{| class="wikitable"
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|[[File:Biuret.png|center|300px]]
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| style="height:20px; width:300px; text-align:center;" |This [[Biuret]] has turned purple, indicating protein is present.
|}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f84 ''Biuret test, page 104-5, GCSE Biology; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe09721 ''Biuret test, page 28, GCSE Combined Science; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Biuret test, page 32, GCSE Biology; The Revision Guide, CGP, AQA '']