اثر پوشش‌دهی کیتوسان و ژل آلوئه‌ورا بر شاخص‌های کیفیت و عمر انبارمانی انگور ’عسگری‘

علوم باغبانی

مقاله 6، دوره 37، شماره 3 - شماره پیاپی 59، آبان 1402، صفحه 655-668   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jhs.2022.75778.1151

نویسندگان

عبداله احتشام نیا^{* 1}؛ شیرین تقی پور²؛ سارا سیاه منصور³

¹گروه علوم باغبانی، دانشگاه لرستان، خرم آباد

²فیزیولوژی تولید و پس از برداشت گیاهان باغی، علوم باغبانی، دانشکده کشاورزی، دانشگاه لرستان

³گروه باغبانی، دانشکده کشاورزی، دانشگاه لرستان

چکیده

میوه انگور در مراحل پس از برداشت، به دلیل نرم شدن بافت، بسیار فسادپذیر می‌باشد که همین امر عمر پس از برداشت آن را کوتاه می‌کند. پوشش‌های خوراکی مانند کیتوسان و ژل آلوئه‌ورا با ایجاد ساختار محافظت کننده در برابر آسیب‌های مکانیکی و تغییر اتمسفر درونی بافت، می‌توانند کیفیت میوه‌ها را افزایش دهند. به همین منظور، در این بررسی اثر محلول‌پاشی کیتوسان (در سه غلظت صفر، 2 و 3 درصد) قبل از برداشت و ژل آلوئه‌ورا (صفر، 25 و 33 درصد) بعد از برداشت، بر کیفیت و ماندگاری میوه انگور رقم عسگری در پنج زمان مختلف (صفر، 7، 14، 21 و 28 روز پس از برداشت) در دمای 4 درجه سانتی‌گراد مورد ارزیابی قرار گرفت. نتایج تجزیه واریانس نشان دهنده معنی‌دار بودن اثر تیمار و زمان انبارمانی بر صفات مورد نظر در سطح یک درصد بود. میوه‌های تیمار شده با کیتوسان و ژل آلوئه‌ورا دارای سفتی بافت، شاخص طعم، محتوای فنلی، فعالیت آنتی‌اکسیدانی و اسیدهای قابل تیتراسیون بالاتر و شاخص پوسیدگی و اسیدیته کم‌تر از شاهد بودند. بالاترین میزان محتوای فنل، آنتی‌اکسیدان، شاخص طعم و اسیدیته قابل تیتراسیون در هر پنج زمان اندازه گیری متعلق به تیمارهای کیتوسان 2 درصد به همراه هر دو غلظت ژل آلوئه‌ورا (25 و 33 درصد) و کم‌ترین میزان مربوط به تیمار شاهد بود. در تیمار شاهد، در مدت زمان انبارمانی درصد شاخص پوسیدگی افزایش یافت و در انگورهای تیمار شده با کیتوسان و ژل آلوئه‌ورا روند پوسیدگی کندتر بود و کم‌ترین میزان پوسیدگی در تیمار کیتوسان 2 درصد به همراه ژل آلوئه‌ورا در روز 14ام مشاهده شد. به طور کلی، بر اساس نتایج به دست آمده مشاهده شد که کاربرد قبل از برداشت کیتوسان و پس از برداشت ژل آلوئه‌ورا، عمر پس از برداشت انگور ’عسگری‘ را افزایش داد و موجب بهبود صفات کیفی در آن شد.

کلیدواژه‌ها

آنتی اکسیدان؛ پوشش طبیعی؛ شاخص پوسیدگی؛ محتوای فنول کل

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