I need an analytical method using HPLC for the separation of ciprofloxacin and levothyroxine
(I have isocratic not gradient HPLC )
Even that if you have a gradient method do not hesitate to tell me the method.
Yes. As I recall it is about 50/50 Metanol/pH 3 Phosphate Buffer. Detection is a PDA/DAD and column is a 10 cm C18 ODS. However, the results (concentration) depends on your sample matrix (drug substance, dosage form...).
Please look at the following below links which may help you in your analysis:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4293686/pdf/IJPhS-76-541.pdf
https://www.tandfonline.com/doi/pdf/10.3109/14756360903373350
https://dalspace.library.dal.ca/bitstream/handle/10222/65293/Anand-Utkarshini-MSc-PHAS-August-2013.pdf?sequence=1&isAllowed=y
Thanks
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