Abstract
The rotational dynamics of the uncharged, triple-helical polysaccharide schizophyllan was determined by transient electric birefingence. The field-free decay of a sample with weight average molecular weight of 437× 10 3gmol −1 deviated from single-exponential behaviour. The relaxation spectra obtained by analysis using the CONTIN program, were bimodal, whereas analysis by the stretched exponentials also accounted well for the field-free decay of the birefringence of the polydisperse sample. The mean rotational relaxation time extrapolated to infinite pulse duration of the orienting pulse for dilute aqueous solution of the 437×10 3gmol −1 sample was determined equal to 61 μs. Analysis of the influence of chain rigidity on the rotational dynamics of the polydisperse sample indicated that the persistence length, L pe , was 70nm.
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