Nuclear Magnetic Resonance of Polyamino Acids. I

概要

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In order to study molecular motion in polyamino acids in solid state, nuclear magnetic resonance measurements were carried out over a wide range of temperature for following ten polymers; poly-γ-methyl-L-glutamate, poly-L-methionine, poly-γ-benzyl-L-glutamate, poly-δ, N-carbobenzoxy-L-ornithine, poly-ε, N-carbobenzoxy-L-lysine, poly-L-ornithine hydrochloride, poly-L-lysine hydrochloride, poly-sodium-L-aspartate, poly-sodium-D-glutamate and poly-L-tryptophane. Comparison of experimental and calculated second moments showed that all polymers except for poly-γ-methyl-L-glutamate and poly-L-metionine are in rigid state at 77°K. Decrease of the line width and the second moment with increasing temperature was mainly interpreted in terms of motion of side chain. The narrowing temperature was found to be considerably affected by the type of side chain. The polymers which have a benzyl ester group showed a very rapid narrowing at room temperature. It should be noted that more than two methylane groups are required in the side chain to cause such a narrowing. Poly-sodium-L-aspartate, poly-sodium-D-glutamate, poly-L-ornithine hydrochloride and poly-γ-methyl-L-glutamate showed a rapid narrowing at high temperatures. This narrowing was attributed to motion of main chain in randomly coiled state.
社団法人応用物理学会の論文
1970-09-05