نوع مقاله : مقاله پژوهشی

نویسنده

مربی پژوهش بخش تحقیقات فنی و مهندسی کشاورزی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان همدان

چکیده

گوجه‌فرنگی محصولی زراعی و فرازگرا  با ظرفیت بالای تولید اتیلن و دیگر ترکیبات آلی فرار مانند اتانول و استالدئید است که حدود یک­سوم میزان تولیدی آن در فاصلۀ بین برداشت تا مصرف از بین می‌رود.  در این مطالعه از دو غلظت‌ 5/0 و 5 گرم در لیتر محلول نانو دی اکسید تیتانیوم برای ایجاد تأخیر در تولید بوی نامطلوب ناشی از تجمع اتانول و استالدئید در فضای نگهداری گوجه‌فرنگی رسیده و قرمز رقم هلیل، یا کنترل آن، استفاده شد.  بر اساس نتایج به دست آمده، مشخص شد که ذرات نانو دی اکسید تیتانیم در حضور پرتو فرابنفش و متناسب با غلظت محلول، قادر به کاهش 85 درصد از میزان اتیلن تولیدی، و تجزیۀ 75 تا 100 درصد از استالدئید و اتانول موجود در فضای نگهداری گوجه‌فرنگی هستند.  ارزیابی حسی نمونه­ها نشان می‌دهد از روز چهارم نگهداری میوه در انبار، بوی نامطلوب در تیمار شاهد گوجه­فرنگی قابل شناسایی و در روز دهم نگهداری این مقدار به بیشترین سطح خود می‌رسد.  در حالی ­که تا روز هشتم نگهداری، بوی نامطلوب تجمع یافته در فضای نگهداری گوجه‌فرنگی‌های تیمار شده با غلظت 5 گرم در لیتر نانو دی اکسیدتیتانیم، کمتر از آستانۀ قابل شناسایی بود و تا پایان دوره 12روزه نگهداری نیز در کمترین مقدار باقی ماند. 

کلیدواژه‌ها

عنوان مقاله [English]

Efficiency of Tio2 Photocatalytic Reaction for Removal of Off-Flavor from Tomato Storage

چکیده [English]

The tomato is a climacteric vegetable crop with high capacity for production of ethylene.  Approximately 30% of the crop is lost in the consumption chain during harvest. In this study, two concentrations of nano-TiO2 in the form of TiO2 slurry were applied to tomato containers to evaluate ethanol, acetaldehyde and off-flavor decomposition in the storage atmosphere of tomatoes. The Halil tomato cultivar was harvested at the red stage of ripening for use in this study. The results showed that the TiO2 in the presence of UV light and proportional to the concentration can remove up to 85% of ethylene gas and 100% of ethanol and acetaldehyde from the tomato storage atmosphere. The extent of ethylene, ethanol and acetaldehyde removal caused by TiO2 photo catalytic reactions depended on the TiO2 concentration. A test panel determined that off-flavors were present in the storage atmosphere of the control treatment at 4 d after storage and was highest at 10 d. Off-flavors were not present in the storage atmosphere treated with 5g/l TiO2 at 8 d. At the end of 12 d of storage, the lowest level for off-flavor was detected in this treatment.

کلیدواژه‌ها [English]

  • Acetaldehyde
  • Ethanol
  • Storage
  • TiO2
  • tomato
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