Handbook of Advanced Chromatography / Mass Spectrometry Techniques
Chapter 2 - Advances in Hydrophilic Interaction Liquid Chromatography
by Pavel Jandera

Figure 2-5. Structures of zwitterionic HILIC stationary phases: silica bonded sulfobetaine ZIC-HILIC (A), phosphorylcholine ZIC-cHILIC (B), poly amino-phosphate (C), and organic polymer N,N-dimethyl-N-methacryloxyethyl-N-(3- sulfopropyl) ammoniumeethylene-dimethacrylate (D).

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