نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار، گروه شیمی مواد غذایی، مؤسسه پژوهشی علوم و صنایع غذایی، مشهد، ایران

2 دانشجوی دکترای شیمی مواد غذایی، مؤسسه پژوهشی علوم و صنایع غذایی، مشهد، ایران

3 دانش‌‌آموختۀ کارشناسی ارشد مهندسی علوم و صنایع غذایی، گروه علوم و صنایع غذایی، واحد قوچان، دانشگاه آزاد اسلامی، قوچان، ایران

چکیده

گردو حاوی بسیاری از ترکیبات غذایی ازجمله اسیدهای چرب امگا-3، انواع ویتامین‌ها بخصوص ویتامین E و انواع مواد معدنی است. ازاین‌رو، گسترش محصولات غذایی بر پایۀ گردو و مطالعۀ روی آنها از جهات مختلف و ازجمله پایداری شیمیایی و میکروبی طی نگهداری بسیار حائز اهمیت است. در این تحقیق به بررسی اثر غلظت‌های مختلف آنتی‌اکسیدان بوتیل هیدروکسی تولوئن (BHT) در سه سطح (100، 150 و 200 میلی‌گرم بر لیتر) بر تغییرات عدد پراکسید و عدد اسیدی کرۀ گردو و همچنین اثر دو نوع نگهدارندۀ اسید بنزوئیک و اسید سوربیک در دو سطح (400 و 800 میلی‌گرم در کیلوگرم) به‌صورت جداگانه و مخلوط بر شمارش کلی میکروارگانیسم‌ها و شمارش کپک و مخمر نمونه‌های کرۀ گردو، طی 75 روز نگهداری در دمای محیط پرداخته شده است. نتایج این تحقیق نشان داد که با افزودن BHT در غلظت 200 میلی‌گرم بر لیتر، عدد پراکسید به میزان قابل توجهی نسبت به نمونۀ شاهد کاهش یافت. عدد اسیدی کرۀ گردو پس از تولید 0/3 درصد بود که تا روز 75ام نگهداری در نمونه‌های مختلف به 0/4 تا 0/5 درصد رسید. همچنین نتایج نشان داد اسید بنزوئیک در مقایسه با اسید سوربیک کارایی بیشتری در کاهش شمارش کلی باکتری‌ها و شمارش کپک و مخمر طی دورۀ نگهداری دارد.

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