کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6403743 1330897 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermo-compression of biodegradable thermoplastic corn starch films containing chitin and chitosan
ترجمه فارسی عنوان
ترمو فشرده سازی فیلم های نشاسته گرانقیمت زیست تخریب پذیر حاوی کیتین و کیتوزان
کلمات کلیدی
فیلم های نشاسته گرانقیمت ذرت با کیتوسان و کیتین، ترمو فشرده سازی، مشخصات ساختاری، مانع و خواص مکانیکی، ظرفیت ضد میکروبی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش تغذیه
چکیده انگلیسی


- Thermoplastic starch films with chitosan/chitin for food packaging were developed.
- Films were easy to handle with good appearance and uniform thickness.
- Films had homogeneous cross-sections without pores/cracks and glycerol migration.
- Biocomposites presented higher color, UV absorption and opacity than TPS films.
- Chitosan/chitin improved WVP and modified mechanical properties of TPS films.

Films based on thermoplastic corn starch (TPS) and chitosan/chitin were obtained by melt-mixing and thermo-compression. Chitosan and chitin incorporation to TPS matrix induced some structural modifications due mainly to the interactions between starch hydroxyl and chitosan/chitin amino groups. Crystallinity degree of TPS films was increased with biopolymers incorporation. Enthalpy melting values for TPS-chitosan/chitin films resulted lower than those corresponding to TPS control ones. Films had homogeneous and smooth surfaces, without pores and cracks and no glycerol migration was evidenced by Scanning Electronic Microscopy. Films fracture surfaces were uniform without the presence of unmelting starch granules neither chitosan/chitin agglomerates. Films with chitosan/chitin presented higher color, UV absorption capacity and opacity than TPS films. Addition of 10 g chitosan or chitin/100 g starch decreased 35 and 56% water vapor permeability, respectively. Biopolymers addition to TPS increased tensile strength and elastic modulus, and decreased elongation at break. Starch and glycerol-rich domains where evidenced in TPS matrixes by Dynamic Mechanical Analysis. Finally, TPS-chitosan films reduced Staphylococcus aureus and Escherichia coli growth in the contact zone.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: LWT - Food Science and Technology - Volume 57, Issue 1, June 2014, Pages 106-115
نویسندگان
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