Proteins - Complete analysis of peptide compositon
8 important questions on Proteins - Complete analysis of peptide compositon
What are the current parameters used to describe a hydrolysate and on what does it not give sufficient information?
- Degree of hydrolysis (DH)
- Extent of degradation of intact proteins
- Peptide molecular weight distribution
Do not provide sufficient information to
- fully describe the composition of a hydrolysate
- understand the mechanism of hydrolysis
Why is the proteomics method not useful to determine analyse the peptides in food?
Also there are no specific enzymes present and they are able-free.
How was the peptide annotation of beta-lactoglobuline determent by a pro-tease specific to glutamic acid E and espartic acid D?
This is done for the protein at different points in time in order to follow the hydrolysis.
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How can you analyse the quality of the peptide annotation?
You know what peptides you should find and you know what you did find. This difference will tell you how well the method worked for you annotation.
Can you better use UV or MS for quantification?
What are the problems with using MS for quantification?
- You have ionization so you dont know the slope of the peptides and it can only be found with standers which are expensive and cost a lot of time.
- Variation of angle in which is sprayed an influence the quantification
- There is a mass charge ratio so this can change from day to day so every day you need to calibrate.
- Mass can change due to adducts
Why was it sad that you can not use UV for quantification with LC?
How did they they test the consistency of peptide sequence coverage?
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