Abstract
A 5% albumin aqueous solution has been irradiated with air spark plasma radiation and UV light from a low-pressure mercury lamp, and the concentration of -SH groups has been determined. The unirradiated solution contains on average about 0.2 SH groups per albumin molecule. During the spark discharge treatment of albumin for 15 min, the concentration of -SH groups increases by a factor of ∼2 and then remains unchanged. After UV irradiation, the concentration of -SH groups monotonically increases to become approximately seven times greater for 30 min. The increase in the concentrations of -SH groups is due to the reduction of disulfide bonds. The reducing agents in the case of spark discharge can be degradation products of peroxynitrous acid.
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