اثر پلاسمای سرد بر خصوصیات ساختاری و رئولوژیکی صمغ گوار

نویسندگان
فاطمه فاضلی 1
رضا فرهمندفر 2
فرشاد صحبت زاده 3
1 کارشناسی ارشد، گروه علوم و صنایع غذایی، موسسه آموزش عالی خزر، ایران
2 دانشیار، گروه علوم و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران
3 استاد، گروه فیزیک اتمی و مولکولی، دانشگاه مازندران، ایران
10.52547/fsct.18.114.35
چکیده
در این پژوهش، ویژگی­های فیزیکی و شیمیایی پودر تجاری صمغ گوار پس از تیمار پلاسمای سرد فشار هوای اتمسفر در سه زمان مختلف (5، 10 و 15 دقیقه) بررسی شد. نتایج حاصل از آزمون جریان برشی پایا نشان داد که رفتار هردو نمونه شاهد و نمونه­های تیمارشده با پلاسمای سرد شل شونده با برش بود. بین مدل­های رئولوژیکی، مدل هرشل بالکلی از ضریب تبیین (R2) بالاتری برخوردار بود. مقدار nH در نمونه شاهد و تیمار کمتر از 1 بود. با افزایش زمان، مقدار KH (به جز 5 دقیقه) به طور معنی­داری کاهش یافت. در روبش کرنش، با افزایش زمان تیمار مقدار مدول­های ذخیره G′ و افت G″ با اختلاف معنی­داری کاهش یافت. نمونه تیمار شده به مدت 5 دقیقه نقطه برخورد (G′ = G″) بزرگتری نسبت به نمونه شاهد داشت که با افزایش زمان تیمار کاهش یافت. در محدوده فرکانس پایین آزمون روبش فرکانس نمونه­های شاهد و نمونه تیمار، مدول G″ بالاتر از مدول G′ بود. از فرکانس Hz 1-1/0 مدول G′ و مدول G″ وابسته به فرکانس بودند. پس از برخورد، مدول G′ به مدول G″ غالب شد و صمغ گواررفتارژل مانند ضعیف نشان داد. مقدار tanδ در نمونه­ها کمتر از 1 و بزرگ­تر از 1/0 بود. مقدار ویسکوزیته کمپلکس (η*) با افزایش زمان تیمار با اختلاف معنی­داری کاهش یافت. شیب ویسکوزیته کمپلکس با افزایش زمان، کاهش یافت. داده­های حاصل از FTIR نشان داد که طیف جذب نمونه­های تیمار مشابه نمونه شاهد بود.
کلیدواژه‌ها
آنالیزFTIR
پلاسمای سرد
صمغ گوار
ویژگی‌های رئولوژیکی

موضوعات

عنوان مقاله English

Effect of cold plasma on structural and rheological properties of Guar gum

نویسندگان English

Fatemeh Fazeli 1
Reza Farahmandfar 2
Farshad Sohbatzadeh 3
1 Department of Food Science and Technology, Khazar Institute of Higher Education
2 Department of Food Science and Technology, Sari Agricultural Sciences and Natural Resources University
3 Department of Atomic and Molecular Physics, University of Mazandaran
چکیده English

In this work, the physicochemical properties of commercial guar gum powder were investigated after air atmospheric pressure cold plasma treatment at three different times (5, 10 and 15 min). The results of steady shear flow test showed that behavior of both control and cold plasma treated samples was pseudoplastic. Among the rheological models, the Hershel bulkley model had higher coefficient of determination (R2). The nH in the control and treated samples was less than 1. Also, KH decreased significantly with time (except 5 minutes). In strain sweep, storage module G′ and loss module G″ decreased significantly as the time increased. The crossover point (G′=G″) of 5 minutes treated sample for 5 minutes was higher than the control samples, which decreased with increasing the treatment time. In the low frequency range of frequency sweep, G″ module of the control and treated samples was higher than G′ module. From the frequency of 0.1 to 1 Hz, the G′ and G″ modules depended on the frequency. After crossover, the G″ module prevailed over the G′ module and the guar gum showed weak gel behavior. The value of tanδ in samples was less than 1 and higher than 0.1. The complex viscosity (η*) significantly decreased, as the time of treatment increased. The slope of complex viscosity decreased with the increasing time. The FTIR data demonstrated that the absorption spectrum of the treated samples was similar to the control one.

کلیدواژه‌ها English

FTIR analysis
cold plasma
Guar Gum
Rheological properties
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