تاثیر زمان و نوع آنزیم بر ویژگی‌های ساختاری و آنتی‌اکسیدانی پپتیدهای زیست فعال حاصل از پروتئین لوبیا سفید (Phaseolus vulgaris L.)

نویسندگان
1 دانشجوی دکتری تخصصی گروه علوم و صنایع غذایی،واحد تبریز، دانشگاه آزاداسلامی، تبریز، ایران
2 دانشیارگروه علوم و صنایع غذایی،واحد تبریز، دانشگاه آزاداسلامی، تبریز، ایران
3 استاد گروه علوم و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران
چکیده
در این تحقیق، تاثیر نوع آنزیم (آلکالاز و پپسین) و زمان فرآیند (300-50 دقیقه) بر درجه هیدرولیز و شاخص­های آنتی­اکسیدانی شامل مهاررادیکال آزاد DPPH، ABTS، هیدروکسیل،قدرت احیاءکنندگی، و شلاته­کنندگی یون­های آهن و مس پروتئین لوبیا سفید ارزیابی شدند. همچنین، ترکیب اسیدهای آمینه (انواع اسیدهای آمینه آبگریز، آنتی­اکسیدان) و ویژگی­های ساختاری (FTIR) پروتئین اولیه و هیدرولیزشده­ها بررسی شدند. نتایج نشان دادند که هیدرولیز آنزیمی موجب بهبود ویژگی­های آنتی­اکسیدانی می­شود. همچنین، ترکیب اسیدهای آمینه تاثیر قابل توجهی بر ویژگی­های آنتی­اکسیدانی می­گذارد. از سوی دیگر، نوع آنزیم و زمان فرآیند هیدرولیز بر درجه هیدرولیز و فعالیت آنتی­اکسیدانی هیدرولیزشده­ها تاثیر داشتند. بدین شکل که، بالاترین درصد مهار رادیکال آزاد DPPH (82.4%)، ABTS(58.3%)، قدرت احیاءکنندگی (0.97)، مهار رادیکال هیدروکسیل (57.5%)، و شلاته­کنندگی یون­های آهن (53.7%) و مس (12.1%) تحت تاثیر نوع آنزیم و زمان فرآیند قرار گرفتند. در بین تیمارهای مختلف، بالاترین مقدار این شاخص­ها (به جز شلاته کنندگی یون مس) مربوط به هیدرولیزشده با آنزیم آلکالاز بود. ویژگی­های ساختاری پروتئین لوبیا سفید ارزیابی و هیدرولیز آنزیمی موجب تغییر در نواحی آمیدی (1 و 2) و همچنین در معرض قرار گرفتن برخی گروه­های نهفته شد. نتایج این تحقیق حاکی از تاثیر مثبت هیدرولیز آنزیمی بر تولید هیدرولیزشده­های با خاصیت آنتی­اکسیدان با قابلیت استفاده در صنایع غذایی بودند.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Effect of time and enzyme type on the structural and antioxidant properties of bioactive peptides obtained from navy bean protein (Phaseolus vulgari L.)

نویسندگان English

Nazila Zeinali namdar 1
Leila Roufegarinejad 2
Ainaz Alizadeh 2
Seid Mahdi Jafari Jafari 3
Narmela Asefi 2
1 PhD, Department of Food Science and Technology, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
2 AssociatedProfessor, Department of Food Sciences, Tabriz branch, Islamic Azad University, Tabriz, Iran.
3 Professor, Faculty of Food Science & Technology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
چکیده English

In this study, the effect of enzyme type (alcalase and pepsin) and process time (50-300 minutes) on the degree of hydrolysis and antioxidant indices including free radical scavenging of DPPH, ABTS, hydroxyl, reducing power, and chelating activity of Iron and copper ions were evaluated for navy bean protein (Phaseolus vulgari L.). Also, the composition of amino acids (hydrophobic and antioxidants types) and structural properties (FTIR) of primary protein and hydrolysates were investigated. The results showed that enzymatic hydrolysis improves antioxidant properties. Also, the composition of amino acids has a significant effect on antioxidant activities. On the other hand, the type of enzyme and the time of the hydrolysis process affected the degree of hydrolysis and the antioxidant activity of the hydrolysates. Thus, the highest percentage of free radicals scavenging of DPPH (82.4%), ABTS (58.3%), reducing power (0.97), hydroxyl radical scavenging (57.5%), and chelation of Fe (53.7%) and Cu ions (12.1%) were affected by the type of enzyme and process time. Among different treatments, the highest value of these indices (except copper ion chelating) was related to hydrolysates with alcalase. Structural properties of white bean protein were evaluated and enzymatic hydrolysis caused changes in the amide regions (I and II) as well as exposure to some hydrophobic-buried groups. The results of this study indicated the positive effect of enzymatic hydrolysis on the production of antioxidant hydrolysates that can be used in the food industry.

کلیدواژه‌ها English

enzymatic hydrolysis
White bean
Antioxidant activity
Structural properties
Amino acid composition
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