Evaluation of Agar Gel Microstructure using Scanning Electron Microscopy (SEM) Images

  • سال انتشار: 1393
  • محل انتشار: اولین کنفرانس بین المللی صمغ های بومی و کاربرد آن در صنعت غذا
  • کد COI اختصاصی: HYDROCOLLOIS01_081
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 576
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نویسندگان

Esmail Khazaei Pul

Ph.D. candidates of food science and Technology, urmia University, Iran

Eisa Jahed

Ph.D. candidates of food science and Technology, urmia University, Iran

Fakhri Shahidi

Professor of food science and Technology, Ferdowsi University of Mashhad, Iran

Behnam fiuzy

Ph.D. candidates of food science and Technology, Ferdowsi University of Mashhad, Iran

چکیده

Scanning electron microscop images provides a logical framework for the development of morphological knowledge, understanding the reactions and self-assembly behavior of food components in small scale, that this issue has effects on building, rheological and bioactivity properties of food on large scale. Agar is one of the strongest and most widely used hydrocolloids in the food industry. In this research, the agar gel microstructure was studied using SEM. Initially 1% agar solution was prepared at 90 °C, then was poured into the network templates of steel. The obtained gel was removed from the templates and were sectioned in dimensions (2×1×1mm). Gel samples were dehydrated in ethanol solution and then dried in a critical point. Then samples with 30 nm of gold/palladium coated and were tested using SEM in the maximum voltage of 15 kv. SEM images provided complete information about the molecular microstructure of agar gel. The SEM results showed that agar makes up a three-dimensional network with regular holes in order to constitute of gel and trapping of water. Results also revealed that polysaccharide fibers of agarose during cooling of agar solution are located next to each other quite regularly and by forming hydrogen bonds constitute the regular cavities wall of agar gel.

کلیدواژه ها

Agar, Gel network, Microstructure, SEM, Hydrocolloids

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