بررسی خصوصیات فیزیکی، مکانیکی و ریخت‌شناسی فیلم کیتوزان تهیه شده با سطح، وزن مولکولی و حلال مختلف

ریاضی کرمانی, پژمان; خادمی شورمستی, داریوش; علیزاده کارسالاری, عبدالله

بررسی خصوصیات فیزیکی، مکانیکی و ریخت‌شناسی فیلم کیتوزان تهیه شده با سطح، وزن مولکولی و حلال مختلف

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشجوی کارشناسی ارشد، گروه صنایع غذایی، واحد سوادکوه، دانشگاه آزاد اسلامی، سوادکوه، ایران

² استادیار، گروه کشاورزی، واحد سوادکوه، دانشگاه آزاد اسلامی، سوادکوه، ایران

³ استادیار، گروه شیمی، واحد سوادکوه، دانشگاه آزاد اسلامی، سوادکوه، ایران

چکیده

بکارگیری زیست پلیمر کیتوزان در قالب فیلم و پوشش خوراکی به عنوان ماده بسته بندی محصولات غذایی، توسعه یافته است. خواص فیزیکی و مکانیکی فیلم کیتوزان تحت تأثیر عوامل مختلفی قرار دارد. با هدف بررسی تأثیر عوامل مؤثر بر محلول تشکیل فیلم، آزمایش حاضر در قالب یک طرح کاملاً تصادفی بهروش فاکتوریل 2³ شامل سطح (2 و 4 درصد)، وزن مولکولی (بالا و پایین) کیتوزان و نوع حلال (اسید استیک و اسید سیتریک) مورد استفاده در تهیه فیلم، در مجمع با 8 تیمار اجرا شد. فراسنجه های فیزیکی و مکانیکی و نیز ریزساختار فیلمها اندازه گیری و بررسی شد. نتایج نشان داد بیشترین استحکام کششی (MPa 01/0 ± 16/0)، مدول یانگ (MPa 55/0 ± 45/2) و ناتراوایی (10^-8. g/msPa 09/0 ± 17/2) در فیلم کیتوزان 4 درصد در وزنهای مولکولی بالا و پایین با حلال اسید استیک و بیشترین کشیدگی در نقطه شکست (95/0 ± 33/54 درصد) در فیلم کیتوزان 4 درصد وزن مولکولی بالا و محلول در اسید سیتریک دیده شد (p<0.05). ضمن اینکه فیلم کیتوزان وزن مولکولی بالا و محلول در اسید استیک در مقایسه با اسید سیتریک شفافتر بود (p<0.05). تصاویر میکروسکوپ الکترونی روبشی (SEM) و تجزیه و تحلیل طیف سنجی مادون قرمز (FTIR) نتایج حاصله را تأئید کرد. بنابراین، عملکرد فیزیکی و مکانیکی فیلم کیتوزان تحت تأثیر سطح و وزن مولکولی و به خصوص نوع حلال اسیدی و نیز اثرات متقابل این عوامل قرار گرفت. در مجموع استفاده از سطح و وزن مولکولی بالاتر کیتوزان منجر به تولید فیلم کاراتر شده و اسید استیک نسبت به اسید سیتریک حلال مناسبتری است.

کلیدواژه‌ها

20.1001.1.22286675.1402.14.54.2.8

موضوعات

بسته بندی زیست تخریب پذیر

عنوان مقاله [English]

Investigation of Physical, Mechanical and Morphological Properties of Chitosan Film Prepared with Different Levels, Molecular Weights and Solvents

نویسندگان [English]

pezhman Riazi Kermani ¹
Dariush Khademi Shurmasti ²
Abdollah Alizadeh Karsalari ³

¹ Department of Agriculture, Islamic Azad University, Savadkooh, Iran

² Dep. of Agriculture, Savadkooh Branch, Islamic Azad University, Savadkooh, Iran

³ Department of Agriculture, Savadkooh Branch, Islamic Azad University, Savadkooh, IRAN

چکیده [English]

Using of chitosan biopolymer has been developed in the form of edible film and coating as a packaging material for food products. The physical and mechanical properties of chitosan film are influenced by various factors. To investigate the impact of effective factors on the film-forming solution, the present experiment in a completely randomized design using the 23 factorial method, a total of 8 treatments including the level (2 and 4%), molecular weight (high and low) of chitosan and solvent type (acetic acid and citric acid) used in film preparation was carried out. The physical and mechanical parameters of the films were measured. Also, the microstructure of the films was investigated using scanning electron microscope (SEM) images and infrared spectroscopy (FTIR) spectra. The results showed that 4% high and low molecular weights chitosan films which were dissolved in the acetic acid had the highest tensile strength (0.16 ± 0.01 MPa), Young's modulus (2.45 ± 0.55 MPa) and impermeability (2.17 ± 0.09 ± 0.09 g/msPa), and the highest elongation at break (54.33% ± 0.95%) was observed in 4% high molecular weight chitosan film with citric acid solvent (p<0.05). In addition, high molecular weight chitosan film dissolved in acetic acid was more transparent compared to citric acid (p<0.05). SEM images and IR spectra analysis confirmed the obtained results. Therefore, the physical and mechanical performance of the chitosan film was affected by the level and molecular weight of chitosan, and especially the type of acidic solvent, as well as the interaction effects of these factors. In general, the use of a higher level and molecular weight of chitosan leads to the production of a better film, and acetic acid is a more suitable solvent than citric acid.

کلیدواژه‌ها [English]

Acetic Acid
Citric Acid
Tensile Strength
Chitosan
Young's Modulus
Impermeability

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