Dears;
We need your help about the product below:
Product Name: Mupirocin Ointment BP
Test: Related substances
Subject: Guard Column
In Related substances, it is written : When the chromatograms are recorded under the prescribed conditions the retention time of mupirocin is about 13 minutes.
Column: Zorbax C8 7µm, 250 x 4.6mm fitted with a stainless steel guard column packed with the same material.
Remark:
Without Guard Column, the retention time of Mupirocin is about 7.1 minutes.
Question:
What are the dimensions and brand of the Guard Column to be used to obtain retention time of mupirocin at about 13 minutes.