کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
591614 1453878 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrical impedance spectroscopy for monitoring the gum Arabic–chitosan complexation process in bulk solution
ترجمه فارسی عنوان
طیف سنجی امپدانس الکتریکی برای نظارت بر پروتئین پیچیده شدن کیتوزان آدامس عربیک در محلول فله
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
چکیده انگلیسی


• Electrical impedance spectroscopy (EIS) tests were carried out to study the complexation process.
• Gum Arabic and chitosan in bulk solution were considered.
• Parameters from a fractional-order Randles circuit were used as indicators of coacervation changes.
• The EIS was compared with that obtained via traditional ζ-potential measurements

Electrical impedance spectroscopy (EIS) tests were carried out to study the complexation process between gum Arabic (GA; aqueous dispersion, pH 4.75, 1% w/w) and chitosan (Ch; acetic acid dispersion, pH 3.5, 1% w/w) in bulk solution. EIS data were obtained for different GA/Ch mass ratios (RGA/Ch = 1:1–10:1) at frequencies ranging from 1 Hz to 1000 Hz. A fractional-order Randles circuit was used to estimate resistance and capacitance parameters as function of RGA/Ch. Complex coacervates were obtained by subjecting the bulk solutions to centrifugation, and quantifying the sedimentation velocity and height. The equivalent circuit parameters showed sharp changes at the isoelectric point of the complex coacervates. The capability and accuracy of the EIS was compared with that obtained via traditional ζ-potential measurements. The results indicated that the EIS technique can be used at specific frequency ranges as a practical method for monitoring the complexation process between biopolymers.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 495, 20 April 2016, Pages 125–135
نویسندگان
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