sodium butyrate by HPLC

Hi guys,

I have to analyze a sample of sodium butyrate (powder from dietary supplement) in HPLC without using phosphate buffer. I've found this method but it seems it doesn't work..

mobile phases: A water 1% formic acid; B: ACN; column T 40°C; flow 0.6 ml/min; Column Zorbax SB c18 

t   %B

0   0

3   0   

7   1

13   13

16   30

23   55

24   0


Anyone has a method to suggest me?


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