تاثیر پوشش خوراکی ژل آلوئه‌ورا بر ترکیبات زیست‌فعال گوجه‌فرنگی گیلاسی حین نگهداری در دماهای مختلف

نشریه پژوهشهای علوم و صنایع غذایی ایران

مقاله 2، دوره 18، شماره 1 - شماره پیاپی 73، فروردین و اردیبهشت 1401، صفحه 21-39   

نوع مقاله: مقاله پژوهشی فارسی

شناسه دیجیتال (DOI): 10.22067/ifstrj.v18i1.88987

نویسندگان

سمانه منجم؛ علی گنجلو^* ؛ ماندانا بی مکر

گروه علوم و مهندسی صنایع غذایی، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران.

چکیده

در این پژوهش با توجه به لزوم حفظ ویژگی‌های کیفی محصولات کشاورزی در مرحله پس از برداشت و افزایش زمان ماندگاری آنها تاثیر پوشش خوراکی ژل آلوئه‌ورا (صفر، 25، 50، 75 و 100 درصد حجمی/ حجمی) و دمای نگهداری (5، 12 و 25 درجه سلسیوس) بر تغییرات برخی از ترکیبات زیست‌فعال گوجه‌فرنگی‌‎های گیلاسی حین دوره نگهداری مورد بررسی قرار گرفت. بدین منظور گوجه‌فرنگی‌های گیلاسی با غلظت‌های مختلف از ژل آلوئه‌ورا به‌روش غوطه‌وری پوشش‌دار شدند و پس از بسته‌بندی به مدت 24 روز در دماهای مختلف نگهداری شدند. تجزیه و تحلیل آماری نشان داد غلظت ژل آلوئه‌ورا، دما و زمان نگهداری تاثیر معنی‌داری بر روند تغییرات ترکیبات زیست‌فعال داشتند (05/0p<) هرچند این تفاوت بین سطح 75 و 100 درصد غلظت ژل آلوئه‌ورا معنی‌داری نبود (05/0<p). بر اساس نتایج به‌دست آمده میزان آسکوربیک اسید با افزایش دما و زمان نگهداری کاهش یافت در حالی که اعمال پوشش سبب حفظ آسکوربیک اسید حداکثر به میزان 65/12 درصد گردید. روند تغییرات لیکوپن گوجه‌فرنگی‌های گیلاسی بر خلاف روند تغییرات آسکوربیک اسید بود. حین دوره نگهداری در دمای 5 درجه سلسیوس محتوای ترکیبات فنولی کل و فعالیت مهارکنندگی رادیکال‌های آزاد DPPH گوجه‌فرنگی‌های گیلاسی شاهد به ترتیب حداکثر به میزان 35/12 و 60/21 درصد افزایش یافت. اما بر خلاف دمای 5 درجه سلسیوس که این افزایش به‌طور پیوسته بود با افزایش دما به 12 و 25 درجه سلسیوس مقدار ترکیبات فنولی کل به‌ترتیب از روز 12 و 8 دوره نگهداری روندی کاهشی را آغاز نمود. این در حالی است که با افزایش غلظت ژل آلوئه‌ورا محتوای ترکیبات فنولی کل و فعالیت ضدرادیکالی به‌ترتیب حداکثر به میزان 24/12 و 30/24 درصد افزایش یافت. بر اساس یافته‌های این پژوهش برای حفظ ترکیبات زیست‌فعال گوجه‌فرنگی گیلاسی در مرحله پس از برداشت می‌توان از دمای 5 درجه سلسیوس و ژل آلوئه‌ورا با غلظت 75 درصد حجمی/ حجمی به‌عنوان یک پوشش خوراکی طبیعی استفاده نمود.

کلیدواژه‌ها

فعالیت ضدرادیکالی؛ ترکیبات فنولی کل؛ آسکوربیک اسید؛ گوجه‌فرنگی گیلاسی؛ آلوئه‌ورا؛ لیکوپن

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