Cobalt-chelated magnetic particles for one-step purification and immobilization of His6-tagged Escherichia coli γγ-glutamyltranspeptidase. - Lo, Huei-Fen; Hu, Hui-Yu; Hung, Chih-Peng; Chen, Shih-Chun; Lin, Long-Liu (Biocatalysis & Biotransformation, 2009)