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- Posts: 1
- Joined: Sun Jun 30, 2019 1:48 pm
I'm a new member and also a new HPLC user.
I'm working on an academic project that aims to separate 7 small peptides.
One of these small peptides is being eluted very early (in the void volume). I have already made some changes in the gradient curve and some method parameters trying to delay the first peak elution, but nothing has worked.
Actually, it's worked once (5-65% Mobile Phase B), but it is not reproducible.
RP-HPLC
Shimadzu System
Column Phenomenex C8 250 x 4.6 - 5 micron 100 Angstrom
Method parameters:
Injection Volume: 30 μl
Mobile Phase A: H2O + 0.1% TFA
Mobile Phase B: ACN + 0.1% TFA
Gradient : 10 - 65% MP B
Could you please provide me with advice on how to change it?
Thanks in advance!