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- W2014371950 abstract "Synthesis and conformational studies of polypeptide homopolymers and random copolymers of L-methionine and S-ethyl-L-cysteine are reported. Syntheses were carried out by sodium methoxide initiation of the N-carboxyanhydrides of the α-amino-acids dissolved in nitrobenzene. The polymers were studied in solution by classical techniques: optical rotatory dispersion, viscometry, light scattering, and spectrophotometry. The effect of the solvent composition on the helix-random coil transition for poly (L-methionine) indicates that this polypeptide is still about 60% helical in pure dichloroacetic acid (DCA). Similar behavior of random copolymers containing 60% or more of L-methionine is observed. The infrared spectra indicate the “β-structure” of poly (S-ethyl-L-cysteine) and random copolymers rich in S-ethyl-L-cysteine. The influence of solvent composition on the conformational behavior of these polymers is slight. Weight-average molecular weight and radius of gyration have been determined in pure DCA. In the case of poly (L-methionine) the experimental observations agree with the interrupted-helix model." @default.
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- W2014371950 date "2007-03-07" @default.
- W2014371950 modified "2023-09-26" @default.
- W2014371950 title "Solution behavior of homopolymers and random copolymers of l-methionine and s-ethyl-l-cysteine" @default.
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- W2014371950 doi "https://doi.org/10.1002/polc.5070390118" @default.
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