Sorption of Amino Acids from Aqueous Solutions by a Polarized Carbon Adsorbent

The adsorption and electrosorption of tyrosine, tryptophan, and phenylalanine on an A-4 model carbon adsorbent from 0.1 N K2SO4solutions were investigated at various acidity values of the medium. It was found that the sorption of tyrosine and tryptophan is significantly affected by both the polarization potential of the adsorbent and pH of the solution. For phenylalanine, electrosorption dependences were not measured because of its electrochemical instability under experimental conditions. The electrosorption effect was demonstrated for the low-molecular-weight protein, pepsin.