A polarographic study of the pre-sodium type catalytic hydrogen wave exhibited by selenocystine.
Selenocysteine, formed by reduction of selenocystine at the DME at about -0.6 V in an ammoniacal buffer, produces a pre-sodium catalytic hydrogen wave. The effects on this wave of variation of several physico-chemical parameters such as selenocystine concentration, mercury column height, buffer capacity and concentration, and ionic strength, have been studied. The results obtained all support the conclusion that the wave is of pre-sodium type. The partially protonated species of selenocysteine seem to be catalytically active. An analytical determination of selenocystine in the presence of selenocysteine, based on this study, is proposed.
Voicu
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Institute of Atomic Physics, Bucharest, Romania.
Căluşaru
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