Physicochemical studies of oligodextran. I. Molecular weight dependence of intrinsic viscosity, partial specific compressibility and hydrated water.

摘要: The number average molecular weight, Mn, of low weight dextran was determined through endgroup analysis, and the intrinsic, viscosities these materials in aqueous solution were at 25°C. ultrasonic velocities their solutions also measured 25 45°C. As concerns dependence intrinsic viscosity, partial specific compressibility solute hound water around solute, following results obtained. (1) log [η]-log Mn [η]/Mn0.5 – Mn0.5 plots accord with Mark-Houwink Stockmayer-Fix-man equations respectively for > 2, 000, but deviated from 2,000. (3) amount bound calculated sound velocity measurement lakes constant value 0.17 ml g hydration increase decreasing < From results, a molecule is expected to change its conformation random coiling uncoiling stretched form 000 or about 12 glucose units.