تأثیر کاپاکاراگینان بر ژل پر شده امولسیونی سرد ایزوله پروتئین آب پنیر: یک مطالعه رئولوژیکی و مکانیکی

مجله پژوهشهای علوم و صنایع غذایی ایران

مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 11 تیر 1402   

نوع مقاله: مقاله پژوهشی فارسی

شناسه دیجیتال (DOI): 10.22067/ifstrj.2023.81976.1251

نویسندگان

محمد رضا صلاحی؛ سید محمد علی رضوی^* ؛ محبت محبی

گروه علوم و صنایع غذایی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

در پژوهش حاضر، اثر صمغ کاپاکاراگینان (0، 1/0، 3/0، 5/0 و 7/0 درصد) بر ویژگی‌های مکانیکی (آزمون فشاری تک محور)، رئولوژیکی (آزمون­های برشی پایا، کرنش متغیر و فرکانس متغیر) و ظرفیت نگهداری آب ژل سرد پر شده امولسیونی مبتنی بر ایزوله پروتئین آب پنیر بررسی شد. طبق نتایج آزمون برشی پایا، تمامی نمونه‌ها دارای رفتار تضعیف شونده با برش بودند و بر اساس مدل قانون توان، در حضور کاپاکاراگینان این رفتار تشدید می­شد؛ و با افزایش غلظت صمغ از صفر تا 7/0 درصد، مقدار ضریب قوام از 9/339 تا 7/545 پاسکال در ثانیه افزایش می­یافت. در آزمون کرنش متغیر، با افزایش درصد صمغ مقادیر مدول الاستیک و ویسکوز در ناحیه خطی و مدول در نقطۀ متقاطع افزایش یافتند و tan d_LVE از 17/0 به 13/0 کاهش پیدا کرد که بیانگر افزایش استحکام ساختار شبکه ژل امولسیون بود. بر اساس آزمون فرکانس متغیر، با افزایش غلظت کاپاکاراگینان، پارامترهای  و ، قدرت شبکه و گسترش شبکه به‌ترتیب از 8/5311 پاسکال، 9/939 پاسکال، 1/5380 پاسکال در ثانیه و 05/10 در نمونۀ ژل امولسیون شاهد تا 6/25080 پاسکال، 9/3574 پاسکال، 7/16097 پاسکال در ثانیه و 41/16 در نمونۀ حاوی 7/0 درصد کاراگینان افزایش یافتند. به­طور کلی، در ژل­های امولسیونی مرکب، مقادیر مدول ظاهری الاستیسیته و تنش شکست بیشتر و کرنش شکست و انرژی شکست کمتر از نمونه شاهد بود. همچنین، نتایج نشان داد که غلظت­های مختلف کاپاکاراگینان اثر معنی­داری بر ظرفیت نگهداری آب نمونه­های ژل امولسیون نداشت. نتایج این پژوهش می­تواند به دانش تولید غذاهای کاربردی جدید مبتنی بر برهمکنش پروتئین-پلی ساکارید بیفزاید.

کلیدواژه‌ها

بافت؛ پروتئین آب پنیر؛ رئولوژی؛ ژل سرد پر شده امولسیونی؛ کاپاکاراگینان

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