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Using neutron reflectivity together with an appropriate electrochemical cell,we have studied the effects of transverse electric field on the Bovine SerumAlbumin (BSA) monolayer initially adsorbed at the interface of the aqueoussolution and a conductive doped-silicon wafer. Depending on the sign of theinitial potential, a second layer is adsorbed on top of the first whereas asubsequent reversal of potential has no effect. We show that this behaviorreveals the slow and remanent electric polarization of the first BSA layer andsuggest an analogy with spin glasses based on the dipolar structure of thisprotein.

Slow and remanent electric polarization of adsorbed BSA layer evidenced by neutron reflection