Marquez, C D; Lee, M L; Weintraub, S T et al. (1997) Quantitative analysis of exogenous peptides in plasma using immobilized enzyme cleavage and gas chromatography-mass spectrometry with negative ion chemical ionization. J Chromatogr B Biomed Sci Appl 700:9-21 |
Marquez, C D; Weintraub, S T; Smith, P C (1997) Quantitative analysis of two opioid peptides in plasma by liquid chromatography-electrospray ionization tandem mass spectrometry. J Chromatogr B Biomed Sci Appl 694:21-30 |