Esterase activity associated with secretory IgA and free secretory component preparations from human milk
(1973) Biochimica et Biophysica Acta : international journal of biochemistry and biophysics — Vol. 317, n° 2, p. 517-523 (1973)
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- Secretory immunoglobulin A (IgA) and free secretory component were purified from human milk using methods involving (NH4)2SO4 precipitation, ion-exchange and gel-filtration chromatography. It was found that the preparations, although apparently pure by conventional criteria based on immunoelectrophoresis, zone electrophoresis, or ultracentrifugation, were consistently contaminated by two different esterases. These enzymes could apparently not be removed by further ion-exchange chromatography and/or gel filtration. They could, however, be eliminated by passage on an immunoabsorbent made from anti-free secretory component antiserum.
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Kobayashi, K., Roberts, T. K., Vaerman, J.-P., Masson, P. L., & Heremans, J. F. (1973). Esterase activity associated with secretory IgA and free secretory component preparations from human milk. Biochimica et Biophysica Acta : international journal of biochemistry and biophysics, 317(2), 517-523. https://doi.org/10.1016/0005-2795(73)90244-4 (Original work published 1973)