کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7792588 | 1500656 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of ionic strength on the flexibility of alginate studied by size exclusion chromatography
ترجمه فارسی عنوان
تأثیر قدرت یونی بر انعطاف پذیری آلژینات مورد مطالعه با استفاده از کروماتوگرافی اندازه گیری حذف شده
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
SEC measurements of the [η]-M relationship for alginate from Macrocystis pyrifera and the wormlike model can be used to characterize flexibility through two independent treatments (Bohdanecky's equations and HYDFIT program), both providing the same results. Two different assumptions concerning mass per unit of length lead to different conclusions. First: persistence length decreases with ionic strength (the intrinsic component of the persistence length is 11.3 nm and the electrostatic component is 6 nm when ionic strength is 0.01). Second: persistence length is independent of ionic strength (12 nm). Either of these options shows that the wormlike model in itself is not sufficient to explain flexibility over the whole range of chain lengths for these polyelectrolytes. A plausible explanation could be the presence of a combination of short-range and long-range screening effects of the ions of the solutions. This would also explain some data found in the literature regarding alginate flexibility.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 102, 15 February 2014, Pages 223-230
Journal: Carbohydrate Polymers - Volume 102, 15 February 2014, Pages 223-230
نویسندگان
F. Guillermo DÃaz Baños, Ana I. DÃez Peña, J. Ginés Hernánez Cifre, M. Carmen López MartÃnez, Alvaro Ortega, José GarcÃa de la Torre,