Optical Rotatory Dispersion of Polypeptides in the Near‐Infrared Region

For the first time ORD measurements in the near‐infrared region from 0.7 to 2.0 μ for well‐known polypeptides, namely, poly(γ‐benzyl L‐glutamate), poly(L‐glutamic acid), poly‐L‐lysine·HCl, poly‐S‐carbobenzoxymethyl‐L‐cysteine, and Bombyx mori silk fibroin, were carried out. It was found that the value of the optical activity infrared term, which is proportional to the sum of rotational strengths of vibrational transitions, depends on polypeptide conformation. The optical activity infrared term value is equal to zero for the random‐coil conformation, it is small but exceeds the measurement error for the α‐helical state, and finally, for the β conformation it is an order of magnitude higher than for the α‐helical state. The obtained results permit one to hope that on the basis of ORD measurement in the near‐infrared region it will be possible to suggest a method of determining the β‐form content in polypeptides and proteins

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