Non-Thermal Effects of a Ceramics Irradiation on the Dissociation State of Lysine

概要

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The pH of a lysine aqueous solution was quickly lowered by about one unit when it was irradiated with a ceramics radiator with cooling. The maximum point of difference in pH of the irradiated lysine from that of the non-irradiated one occurred near the first equivalent point of the α-carboxyl group. The molar extinction of lysine also decreased with the irradiation time. Dissociation constants of α-carboxyl, and ε- and α-amino groups signiticantly decreased. The entropy dependency of dissociation of the α-carboxyl group was changed to an enthalpy one by the irradiation, while the enthalpy dependency of the ε- and α・amino groups tended to be changed to an entropy one by the irradiation. The mechanism of promotion of the dissociation by far-infrared waves irradiated from the ceramics has been estimated by a thermodynamic analysis as a hydration effect of the waves on the dissociable groups.
社団法人日本農芸化学会の論文
1995-03-23