Flexible Method for Conjugation of Phenolic Lignin Model Compounds to Carrier Proteins

摘要

Linking lignin model compounds to carrier proteins is required either to raise antibodies to them or to structurally screen antibodies raised against lignins or models. This paper describes a flexible method to link phenolic compounds of interest to cationic bovine serum albumin (cBSA) without interfering with their important structural features. With the guaiacylglycerol-beta-guaiacyl ether dimer, for example, the linking was accomplished in 89% yield with the number of dimers per carrier protein being as high as 50; NMR experiments on a N-15- and C-13-labeled conjugation product indicated that 13 dimers were added to the native lysine residues and the remainder (similar to 37) to the amine moieties on the ethylenediamine linkers added to BSA; similar to 32% of the available primary amine groups on cBSA were therefore conjugated to the hapten. This loading is suitable for attempting to raise new antibodies to plant lignins and for screening.