Case
Food tests
- Institution
- PEARSON (PEARSON)
Step by step method of Food tests
[Show more]
Seller
Follow
Content preview
Testing for MacronutrientsMacronutrient Test Result
Starch Iodine test Colour change from brown
to blue
Protein Biuret test Colour change from blue to
purple
Lipids Ethanol test White milky sheet layer on
the top of the water
Reducing Sugars Benedict test Colour change from blue to
brick red
Non-Reducing Sugars Benedict test 1st test no colour change
2nd test colour change from
blue to brick red.
Vitamin C DCpip Colourless from Blue
Method: (Cheerios)
1. I inserted a small amount of cheerios into separate mortars and crush them into a
liquid solution using distilled water.
2. I then filtered the cheerios liquid away from the excess food using a filter and poured
this into a test tube.
3. After this I used a pipette to take a small amount of the cheerios liquid from the test
tube and put a small amount into 6 different test tubes creating a 1:1 ratio amount
with each macronutrient. (Iodine, Biuret, Ethanol, Benedicts x2 and DCPIP)
4. Lastly I put the test tube with both mixes into a water bath to help quicken the
reaction while I waited for them to change colour.
5. I wrote down all the results on a table.
Method: (Potato)
1. I inserted a small amount of potatoes into separate mortars and crush them into a
liquid solution using distilled water.
2. I then filtered the potato liquid away from the excess food using a filter and poured
this into 5 different test tubes for each macronutrient.
3. After this I used a pipette to take a small amount of the potato liquid from the test
tube and put a small amount into 6 different test tubes creating a 1:1 ratio amount
with each macronutrient. (Iodine, Biuret, Ethanol, Benedicts x2 and DCPIP)
4. Lastly I put the test tube with both mixes into a water bath to help quicken the
reaction while I waited for them to change colour.
5. I wrote down all the results on a table.
8
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller jasminemooreyear13. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
51036 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 15 years now