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- Posts: 13
- Joined: Mon Feb 27, 2017 10:03 am
My lab don't have HPLC with ELSD detector and I found that some researcher use HPLC - ELSD for Neomycin sulfate assay. And also, don't have ion exchange chromatrography with PAD detector.
Now , I use the following condition for Neomycin sulfate assay
1. Mobile phase - 84% 0.2 mol trifluoro acetic acid in water and 16% Acetonitrile
2. Flow rate - 0.7 mL/min
3. Detector - HPLC with Refractive index detector
I already tried the different ratio of mobile phase (50:50, 60:40, 70:30, 80:20 and 90:10 of 0.2 mol Trifluoro acetic acid and Acetronitrile). Eventhough, I got the sharp peaks, I can't separate Neomycin C and B and they are still co-elute. Please someone, could you please suggest me about that? Should I change the condition or use derivatization method because of the problem of lacking chromophore in Neomycin sulfate.? May I kindly request to help and advice me.Thank you in advance.