× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
5
o
5
4
m
4
b
4
x
4
a
4
l
4
t
4
S
4
m
3
s
3
New Topic  
amal amal
wrote...
Posts: 35
Rep: 0 0
13 years ago
In cases where several food extracts can match the carbohydrate profile of an unknown solution, suggest differences in composition between the food extracts that could be tested for in order for you to determine which food extract is actually present in your unknown solution (not limited to carbohydrates). Provide the references you used.
Read 1525 times
2 Replies

Related Topics

Replies
wrote...
Valued Member
Educator
13 years ago
Hey Amal,

Say if you extract proteins from a particular food. We know that proteins contains a high amount of nitrogen. The biuret test is a chemical test used for detecting the presence of peptide bonds. In the presence of peptides, a copper(II) ion forms a violet-colored complex in an alkaline solution. Similarly, to test whether the content you extracted is composed of proteins, the Lowry protein assay can be used. This test is a biochemical assay for determining the total level of protein in a solution. The total protein concentration is exhibited by a color change of the sample solution in proportion to protein concentration.

For carbohydrates, you can use the iodine and potassium iodide test. Starches form deeply coloured blue-black complexes with iodine. Starches contain alpha amylose, a helical saccharide ppolyer, and amylopectic. IOdine forms a large complex polysacchardie with blue-black color.

Bial's test can be used to distinguish between pentoses and hexose sugars. Similar the Seliwanoff's test distinguished between aldoses and ketoses.

You see, all these tests can be used to distinguish what molecules are being extracted.

If you need further assistance, reply back Wink Face.
amal Author
wrote...
13 years ago
thnks aloooooooooooooooot man

very wel explained
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1006 People Browsing
Related Images
  
 46
  
 3523
  
 194
Your Opinion