20100300971 | Zwitterionic stationary phase as well as method for using and producing said phase - The present invention relates to a zwitterionic stationary phase comprising a carrier and at least one zwitterionic ligand bound to said carrier, said phase being suitable for HPLC separation in Hydrophilic Interaction mode, wherein the positively charged part of said zwitterionic ligand is located at the end of the ligand, and the negatively charged part of said zwitterionic ligand is located between the positively charged part and the part of said zwitterionic ligand directly binding to said carrier, or a polymeric backbone attached to the carrier, wherein the intramolecular distance between the negatively charged part of the zwitterionic ligand preferably is at most 10 atoms long. The invention also provides methods for producing said zwitterionic stationary phase and method for using the phase in HPLC separations. | 12-02-2010 |