نوع مقاله : مقاله پژوهشی
نویسندگان
گروه بهداشت مواد غذایی، دانشکده دامپزشکی، دانشگاه تخصصی فناوری‌های نوین آمل، آمل، ایران.
چکیده
تمایل به استفاده از نگهدارندههای طبیعی و جایگزین کردن آنها به‌جای نگهدارندههای شیمیایی سبب گردیده است مطالعات مختلفی در مورد ترکیبات طبیعی دارای خواص آنتی‌اکسیدانی و میکروبی مانند اسانس‌ها صورت پذیرد. در پژوهش حاضر اثرات کنسانتره آب نارنج و پوشش کیتوزان حاوی اسانس فلفل سیاه بر فساد شیمیایی فیله ماهی قزل آلای رنگین کمان نگهداری شده در یخچال مورد سنجش قرار گرفت. نمونه‌ها به 8 گروه تقسیم شدند و در دوره زمانی 12 روزه شاخص‌های pH، بازهای نیتروژنی فرار، تیوباربیتوریک اسید، میزان پراکسید، اسیدهای چرب آزاد و ارزیابی حسی مورد بررسی قرار گرفتند. همچنین نمونه‌ها از نظر فعالیت آنتی‌اکسیدانی به روش DPPH (دی فنیل پیکریل هیدرازیل) و RP (قدرت احیاکنندگی) ارزیابی گردیدند. با بررسی نتایج مشخص گردید که نمونه شاهد نسبت به سایر تیمارها به‌صورت معناداری افزایش روند شاخص‌های اکسایشی و حسی را نشان داد و در نمونه‌های پوشش داده شده نیز نمونه ماهی دارای کیتوزان، کنسانتره آب نارنج و اسانس فلفل سیاه کمترین میزان شاخصها را نسبت به بقیه به‌خود اختصاص داد. از نظر مهار رادیکال DPPH، کنسانتره آب نارنج با بریکس39/1 و درصد مهار 9/66% و اسانس فلفل2% با درصد مهار 1/64% توانایی بیشتری داشتهاند. در بررسی فساد اکسایشی و ارزیابی حسی در تمامی آزمونها نمونه کیتوزان به همراه اسانس فلفل و کنسانتره آب نارنج با کسب امتیاز 2/7 از پانل ارزیابی حسی بهتر از سایر تیمارها ارزیابی شد. نتایج حاصله نشان‌دهنده تاثیر مثبت کنسانتره آب نارنج و پوشش کیتوزان دارای اسانس فلفل سیاه در مدت زمان نگهداری بر کیفیت فیله ماهی قزل آلای رنگینکمان می‌باشد.
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