need help for extraction method for insulin

[pokokijau]

does anyone have extraction method to detect insulin in plasma using HLPC?
currently im using rabbit plasma.

[dorota]

Doping control analysis of insulin and its analogues in equine plasma by liquid
chromatography–tandem mass spectrometry
Emmie N.M. Ho Terence S.M.Wan April S.Y.Wong, Kenneth K.H. Lam, Brian D. Stewart
Journal of Chromatography A, 1201 (2008) 183–190

Qualitative Determination of Synthetic Analogues of Insulin in Human Plasma by Immunoaffinity Purification and Liquid Chromatography-Tandem Mass Spectrometry for Doping Control Purposes
Mario Thevis, Andreas Thomas, Philippe Delahaut, Alain Bosseloir, and Wilhelm Scha1nzer
Anal. Chem. 2005, 77, 3579-3585

[dorota]

Have you tried/found any method?

[pokokijau]

ya i found it. the problem is now. whenever i extract blank plasma...the peak of insulin itself came out as insulin is endogenous compound.
how to overcome this problem? coz i have to spike insulin in plasma.