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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

High-performance capillary electrophoresis for characterization of hapten-protein conjugates used for production of antibodies against soyasaponin I.

Micellar electrokinetic capillary chromatography using sodium cholate as the micellar phase has been investigated for characterization of hapten-protein conjugates. Special focus has been placed on the hapten soyasaponin I which is a quantitatively dominating glycoside in seeds of several legumes including pea (Pisum sativum L.) and soybean [Glycine max (L.) Merr.]. Soyasaponin I has been isolated from pea and used as hapten for production of anti-saponin specific polyclonal antibodies. Soyasaponin I was coupled to Kunitz soybean trypsin inhibitor (KSTI) and bovine serum albumin. The degree of coupling was determined by high-performance capillary electrophoresis (HPCE). Capillaries dynamically coated with zwitterions were found to be efficient for reduction of interaction between the silica capillary surface and the proteins. The applicability of HPCE for determination of coupling density was confirmed by investigation of a model hapten (p-nitrophenyl-alpha-D-galactoside; PNPG) coupled to KSTI. The PNPG-KSTI conjugates were examined by both HPCE and by spectrophotometric determination of the PNPG density on KSTI. The HPCE method was shown to be efficient in studies of the formation of hapten-protein conjugates and to be more specific than alternative techniques applied for determination of coupling densities.[1]

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