Leena Leelasvatanakijลีณา ลีลาศวัฒนกิจSeksiri Arttamangkulเสกสิริ อาตมางกูรAldrich, Jane V.2010-08-162011-08-262021-03-242010-08-162011-08-262021-03-242010-08-161997Mahidol University Journal of Pharmaceutical Science. Vol.24, No.1-4 (1997), 7-15.https://repository.li.mahidol.ac.th/handle/20.500.14594/61416In this study, chromatographic conditions for the separation of the lactam analogue of dynorphin A (Dyn A)(1-13)NH2 cyclo[D-Asp(2),Orn(5)]Dyn A(1-13)NH2 from the tetramethylguanidinium by-product [D-Asp(2),Orn(Tmg)(5)]Dyn A(1-13)NH2 and linear peptide [D-Asp(2),Orn(5)]Dyn A(1-13)NH2 were compared. The by-product was obtained following the cyclization of the peptides with 2-(1-H-benzotriazo-1-yl)-1,1,3,3tetramethyluronium hexafluorophosphate. Two methods of high performance liquid chromatography, reverse phase and ion-exchange chromatography, were examined. A number of factors affected the resolutionand the elution profile of peptides, including the ion-pairing agent, the mobile phase pH and the organic solvent. These factors were varied to obtain optimum separation.2580009 bytesapplication/pdfengMahidol UniversityReverse phase chromatographylon exchange chromatographyDynorphin AResearch ArticleFaculty of Pharmacy Mahidol University.