This invention relates to glucopyranose compounds of formula (I) and (IA) ##STR1## and the non-toxic salts thereof wherein the substituents are as defined herein. Such materials possess enhancing activity of cellular immunity (e.g. mitogenic activity) to living tissue and therefore are useful as anti-tumor agents.
In a method comprising comparing a solid phase carrier extract 1 obtained by pre-treating a sample with a ligand-immobilized solid phase carrier and a solid phase carrier extract 2 obtained by treating the pretreated sample again with a ligand-immobilized solid phase carrier in terms of the proteins contained therein, and identifying a protein whose content is remarkably decreased in the extract 2 compared to the extract 1, 1) the problem of the solubility of subject ligand, 2) the problem of the non-specific protein-denaturing effect of the subject ligand added, and the like, which have been problematic in antagonism experiments in target search using an affinity resin, have been solved.
A method to determine specificity of ligand binding includes comparing a solid phase carrier first extract obtained by pre-treating a sample with a ligand-immobilized solid phase carrier and a solid phase carrier second extract obtained by treating the pretreated sample again with a ligand-immobilized solid phase carrier in terms of the proteins contained therein, and identifying a protein whose content is remarkably decreased in the second extract compared to the first extract, in order to solve
1
) the problem of the solubility of subject ligand,
2
) the problem of the non-specific protein-denaturing effect of the subject ligand added, and the like, in antagonism experiments in target search using an affinity resin.