کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7791017 1500645 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rheological characterization of acid pectin samples in the absence and presence of monovalent ions
ترجمه فارسی عنوان
خصوصیات رئولوژیکی نمونه های پکتین اسید در غیاب و حضور یون های تکواندایی
کلمات کلیدی
ساختار زیبا ژل شدن اسید، پکتین انعطاف پذیر، پکتین تصادفی ژل ضعیف راه حل مشکوک،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی
Pectins are traditionally divided into two groups, high methoxy and low methoxy. The groupings determine the charge of the pectin and the gelation mechanism. However, not as yet extensively studied is the impact on gelation of the distribution of the charges as characterized by an absolute degree of blockiness (DBabs). The aim of this study was to characterize rheologically the acid gelation of a pectin with a high DBabs and a degree of methyl esterification of ∼37%, in the absence and presence of monovalent ions. The results obtained suggest that a pectin with a blocky charge distribution at pH conditions close to or below the pKa exhibits weak gel-like properties at intermediate frequencies, despite the absence of a permanent network structure. The addition of monovalent ions changed the rheological behavior to resemble that of a strong gel whose properties depended on the type and concentration of the ions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 113, 26 November 2014, Pages 336-343
نویسندگان
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