Alternatives to Phenomenex Columns

Hi!

I need your help.

What are the best options for these columns:

1. Luna Omega 1.6 µm polar C18, 30 x 2.1mm; Phenomenex

2. SecurityGuard ULTRA Cartridges UHPLC Fully Porous Polar C18 2.1mm ID Columns; Phenomenex

 

Thank you.

 

Best regards,

Natasa

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