Abstract
Circular dichroism of L-cystine solution was studied between −70° and 80°. The CD spectrum changed markedly with temperature. The negative CD band at 255 nm assigned to the disulfide chromophore increased its intensity with decrease of temperature. The positive CD band at 220 nm assigned to carbonyl chromophore showed less significant temperature dependence. Another negative CD band at 200 nm showed temperature dependence comparable to that of the band at 255 nm. The observed marked temperature dependence of CD of the disulfide chromophore was discussed in relation to the possible equilibrium between the two conformations of the disulfide group which are mirror images.
Published Version
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