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jazakallahu khairan...may Allah reward u for ur goodness!! .......i gt it!!!chalo i am giving it a try
amino acids contain the -NH2 group . when the solution is acidic (i.e H+ ions are present), nitrogen in the the -NH2 group uses iits lone pair of electrons and attracts the H+ ion.. a dative covalent bond is formed and the charge on the molecule is is increased by +1 so the spot moves towards the negative electrode(cathode)
in case the solution becomes more alkaline, the COOH ggroup loses its hydrogen in the form of H+ ions to nuetralise the ffect of base (OH- ions and H+ ions react to form water)
but the charge on the original molecule has decreased by 1 , it is attarcted to the anode (pos. electrode)
This way electrophoresis is dependant on the pH