▎ 摘　　要

NOVELTY - Noncovalent complex material comprises graphene oxide which is bound to recombinant streptococcal protein G in a mass ratio of 1:(2.5-3). USE - The noncovalent complex material is useful for purifying and enriching antibody, and detecting pathogen and/or pretreating biological sample (all claimed). ADVANTAGE - The noncovalent complex material has high specific surface area, and biologically activity such as antibody adsorption capacity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing noncovalent complex material, which involves (a) activating graphene oxide, and (b) uniformly mixing activated graphene oxide with recombinant streptococcal protein G, incubating the mixture in a shaker, performing centrifugation, obtaining supernatant, and washing materials.