title: Unusual retention behaviour of 4-substituted piperidines on polybutadiene and polystyrene coated zirconia by comparison to reverse phase silica.
abstract: The retention properties of a range of N-methylated and N-des-methyl 4-substituted piperidines on polybutadiene (PBD) and polystyrene (PS) coated zirconia have been studied and compared to those of Xterra RP(18) and Genesis C(18) silica. The effect of buffer type and pH are investigated with regard to the elution order on all three stationary phases. The change in the elution order is linked to the degree of substitution of the piperidine nitrogen and appears to be independent of the rest of the structure, indicating that this moiety is most heavily involved in the separation mechanism on the zirconia phases.
authors.affiliation: Analytical Development, S15 Laboratory Block, PAR&D, AstraZeneca, Silk Road Business Park, Macclesfield, Cheshire SK10 2NA, UK.
authors.forename: Caroline
authors.initials: C
authors.lastname: Ovens
authors.forename: Dawn
authors.initials: D
authors.lastname: Sievwright
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Silcock
mesh_terms: D002021:Buffers; D002070:Butadienes / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000295:instrumentation / Q000379:methods*; D020724:Elastomers / Q000737:chemistry*; D010880:Piperidines / Q000737:chemistry* / Q000302:isolation & purification*; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D002021:Buffers; D002070:Butadienes; D020724:Elastomers; D010880:Piperidines; D011108:Polymers; D011137:Polystyrenes; D012822:Silicon Dioxide; C028834:polybutadiene; D015040:Zirconium; C028541:zirconium oxide