ارزیابی خصوصیات رئولوژی فیلم و روکش نانوکامپوزیت (پلی لاکتیک اسید و کیتوزان) طی زمان ماندگاری در نان هفت غله

نویسندگان
معصومه یوسفی 1
مهسا تبری 2
حمید توکلی پور 3
سیروس بیدریغ 2
1 دانشجوی دکتری علوم و صنایع غذایی، دانشکده علوم و فنون دریایی، دانشگاه آزاد اسلامی، واحد تهران شمال.
2 عضوهیات علمی
3 عضو هیات علمی
10.22034/FSCT.20.139.68
چکیده
در این بررسی اثر نانو ذرات روی اکسید در سه سطح 1، 3 و 5 درصد به نانوکامپوزیت پلی لاکتیک اسید و کیتوزان افزوده شد و نتایج ارزیابی SEM (میکروسکوپ الکترونیکی) آن مورد ارزیابی قرار گرفت و نشان داد فیلم های حاوی پلی لاکتیک اسید و کیتوزان دارای ساختار نامنظم و فشرده و با افزودن نانوذرات روی اکسید ساختار منظم و منسجم بود که نتایج این پژوهش نشان داد نفوذپذیری بخار آب (WVP) فیلم و روکش نانوکامپوزیت در فیلم های دارای نانو ذرات روی اکسید در سطح 3 درصد سبب افزایش نانو ذرات روی اکسید و نفوذ پذیری به بخار آب اثر معنی داری را نشان داد (05/0>P). نتایج حاصل از دستگاه بافت سنجی نشان داد با افزایش غلظت نانو ذرات استحکام کششی فیلم و روکش نانوکامپوزیت به طور معنی داری کمتر از تیمار شاهد بود (05/0>P). همچنین تغییرات زیاد طول تا نقطه شکست از نقطه نظر آماری اختلاف معنی داری را نشان نداد. نتایج سفتی بافت این پژوهش نیز بیانگر آن بود که طی زمان نگهداری 15 روزه تیمار مورد آزمون دارای بیشترین میزان سفتی است. نتایج تاثیر فیلم و روکش نانوکامپوزیت بر پایه پلی لاکتیک اسید و کیتوزان حاوی نانوذرات روی اکسید بر خصوصیات میکروبی بیانگر آن بود که طی زمان ماندگاری نان غله حاوی پلیمر پلی لاکتیک اسید و کیتوزان اثر مهارکنندگی بر رشد قارچ دارد که با افزایش نانو ذرات روی اکسید به طور معنی داری افزایش می یابد. همچنین نشان داد ماندگاری نان تست هفت غله برش داده شده حاوی متغییرهای مذکور در سطح 5 درصد در مقایسه با تیمار شاهد بیشتر بود.
کلیدواژه‌ها
پلی لاکتیک اسید
روی اکسید
کیتوزان
نان هفت غله
نانوذرات
نانوکامپوزیت

موضوعات

عنوان مقاله English

Evaluation of film rheology and coating of nanocomposites (polylactic acid and chitosan) during shelf life in Seven grains bread

نویسندگان English

masoumeh yousefi 1
Mahsa Tabari 2
hamid tavakolipour 3
sirous bidarigh 2
1 Ph.D. student of Food Science and Food Industry, Faculty of Marine Science and Technology, Islamic Azad University, North Tehran Branch.
2 Academic member
3 Academic member
چکیده English

In this study, the effect of nanoparticles on oxide at three levels of 1, 3 and 5% was added to polylactic acid and chitosan nanocomposites and the results of its SEM (electron microscope) evaluation were evaluated and showed films containing polylactic acid and chitosan. It had an irregular and compact structure and with the addition of nanoparticles on oxide, it had a regular and cohesive structure. And water vapor permeability showed a significant effect (P <0.05). The results of histometry showed that with increasing the concentration of nanoparticles, the tensile strength of the film and the nanocomposite coating was significantly lower than the control treatment (P <0.05). Also, large changes in length to break point did not show a statistically significant difference. The results of tissue stiffness of this study also showed that during the 15-day storage time, the test treatment had the highest amount of stiffness. The effect of film and coating of nanocomposites based on polylactic acid and chitosan containing nanoparticles on zinc oxide on microbial properties indicated that during the shelf life of bread containing polylactic acid and chitosan dimers has an inhibitory effect on fungal growth by increasing nanoparticles on zinc oxide. Increases significantly. It also showed that the shelf life of seven sliced ​​toast containing the mentioned variables was higher at 5% level compared to the control treatment.

کلیدواژه‌ها English

Polylactic acid
Zinc oxide
Chitosan
seven grain breads
Nanoparticles
Nanocomposites
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