نوع مقاله : مقاله پژوهشی

نویسندگان

1 مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی خراسان رضوی

2 دانشگاه فردوسی مشهد

چکیده

در این پژوهش اثر کنسانتره پروتئین شیر (mpc)، پودر آب پنیر (cwp) و صمغ کنجاک (kg) بر روی ویژگی­های فیزیکوشیمیایی، رئولوژیکی و حسی ماست چکیده مورد بررسی قرار گرفت و سپس این خصوصیات با استفاده از روش­های تحلیل مؤلفه اصلی و رگرسیون حداقل مربعات جزئی مقایسه گردید. نتایج آزمون‌های فیزیکوشیمیایی نشان داد که با افزایش میزان mpc و کاهش cwp، تغییرات pH پس از 5 روز و آب­اندازی نمونه­ها کاهش یافت. بر طبق نتایج حاصل از آزمون اکسترژن برگشتی- آنالیز پروفیل بافت، با افزایش میزان صمغ کنجاک سختی، چسبندگی و نیروی چسبندگی نمونه­ها نیز به­طور معنی­داری به‌ویژه برای نمونه­های حاوی cwp بالاتر افزایش یافت در حالی­که در مقادیر بالای صمغ کنجاک با افزایش میزان mpc و کاهش میزان cwp پیوستگی نمونه‌ها کاهش نشان داد. بر اساس آزمون کرنش متغیر نیز با افزایش میزان صمغ کنجاک، G' LVE، G" LVE، γc، τy، τf و Gf نمونه­ها نیز به‌طور معنی‌داری برای نمونه­های حاوی cwp بالاتر افزایش یافت. همچنین نتایج حاصل از بررسی همبستگی بین خصوصیات حسی، فیزیکوشیمیایی و رئولوژیکی نشان داد که رابطه­ای نزدیک بین امتیاز مزه ترش با پذیرش کلی نمونه­ها وجود داشت که این امر نشان دهنده اهمیت بیشتر امتیاز مزه ترش در بین صفات اندازه‌گیری شده برای پذیرش کلی مصرف­کنندگان بود.

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