Light scattering studies of irradiated kappa- and iota-carrageenanстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The relationships between the molecular weight (Mw) and the characteristic decay time distribution function G(Gamma) of irradiated kappa (kappa-) and iota (iota-) carrageenan were studied by static and dynamic light scattering (DLS). Mw and the characteristic decay time (Gamma(-1)) are both steep decreasing exponential function with radiation dose. The dynamic behavior of irradiated iota-carrageenan was compared to irradiated kappa-carrageenan by DLS. The intensity correlation function of both carrageenans shifted towards shorter relaxation times with increasing radiation dose. Irradiated iota-carrageenan like kappa-carrageenan exhibits power law behavior at 0-50kGy (at 0.05-0.1 M KCl) indicating similar gelation behaviors. The temperature at which transition from coil to helix takes place (conformational transition temperature) decreases with increasing irradiation dose. A new faster relaxation mode appears at around 0.1-1 ms for both carrageenans between 100 and 150 kGy. Maximum peak height for this mode is at 100 kGy which corresponds to the optimum biological activity of kappa- and iota-carrageenan. (C) 2004 Elsevier Ltd. All rights reserved.