اثر کاربرد سینامیک اسید بر ماندگاری و کیفیت قارچ دکمه‌ای در دوره پس از برداشت

نوع مقاله : مقاله پژوهشی

نویسندگان

• حدیث چراغی
• فردین قنبری
• مهدی صیدی

گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه ایلام، ایلام، ایران.

https://doi.org/10.22067/ifstrj.2021.70214.1041

چکیده

قهوه‌ای شدن بافت یکی از مهم‌ترین دلایل کاهش کیفیت قارچ دکمه‌ای در دوره پس از برداشت است که تحت تأثیر آنزیم پلی‌فنل اکسیداز اتفاق می‌افتد. در این تحقیق امکان کاهش قهوه‌ای شدن قارچ خوراکی و حفظ کیفیت آن با کاربرد خارجی سینامیک اسید، به‌عنوان بازدارنده فعالیت آنزیم پلی‌فنل اکسیداز، مورد بررسی قرار گرفت. تیمار سینامیک اسید در چهار سطح (شاهد، 100، 200 و 400 میکرومولار) اعمال شد و پس از آن قارچ‌ها به مدت 16 روز در دمای 4 درجه سانتی‌گراد قرار گرفتند. نتایج نشان داد که با افزایش زمان نگهداری فعالیت آنزیم پلی‌فنل اکسیداز و پراکسیداز افزایش یافت و به تبع آن قهوه‌ای شدن بافت نیز روند افزایشی داشت. همچنین با افزایش زمان نگهداری درصد کاهش وزن، پراکسید هیدروژن و مالون دی‌آلدهید افزایش یافت و فنل کل و ظرفیت آنتی‌اکسیدانی کل روند کاهشی داشت. استفاده از تیمار سینامیک اسید در هر سه غلظت (100، 200 و 400 میکرومولار) سبب کاهش فعالیت آنزیم‌های پراکسیداز و پلی‌فنل اکسیداز شد و قهوه‌ای شدن بافت را کاهش داد. همچنین کاربرد سینامیک اسید سبب بهبود صفات کیفی قارچ خوراکی مانند فنل کل، ظرفیت آنتی‌اکسیدانی کل و شاخص کیفیت ظاهری شد. به‌طور کلی نتایج این تحقیق نشان داد که استفاده از سینامیک اسید، خصوصاً در غلظت 400 میکرومولار، سبب کاهش قهوه‌ای شدن بافت، حفظ کیفیت و کاهش افت وزن قارچ خوراکی در دوره پس از برداشت می‌شود

کلیدواژه‌ها

• پلی‌فنل اکسیداز
• ظرفیت آنتی‌اکسیدانی
• فنل کل
• قهوه‌ای شدن بافت
• کاهش وزن

عنوان مقاله [English]

Effect of cinnamic acid on shelf life and quality of button mushroom at postharvest period

نویسندگان [English]

• Hadis Cheraghi
• Fardin Ghanbari
• Mehdi Saidi

Department of Horticultural Science, Faculty of Agriculture, Ilam University, Ilam, Iran.

چکیده [English]

Introduction: Button mushroom (Agaricus bisporus L.) is one of the most popular and widely consumed edible mushrooms that is grown all over the world. However, button mushrooms have a short shelf life of about 3 to 4 days after harvest and lose their commercial value within a few days due to browning of the tissue, water loss, aging and microbial attack. Tissue browning is caused by the activity of polyphenol oxidase (PPO) in plastids on phenolic compounds in the vacuoles as a substrate. Therefore, enzymatic browning is intensified by the loss of membrane integrity due to aging and tissue deterioration and as a result of physical connection between the enzyme and the substrate. The use of some techniques such as the chemicals and physical treatments gives promising results in delaying Browning and increasing the shelf life of edible mushrooms. Cinnamic acid (CA) is an organic acid that occurs naturally in plants and has low toxicity and a wide range of biological activities. Cinnamic acid and its derivatives are widely used in food industry. This compound acts as an inhibitor of polyphenol oxidase activity. On the other hand, cinnamic acid in low concentration has been proposed as an activator of the antioxidant system and its positive effects on reducing the effects of environmental stresses in various plants have been proven in several experiments. Therefore, in the present study, the effect of cinnamic acid treatment on reducing the browning of the tissue and maintaining the quality of white button mushrooms in the post-harvest period has been investigated.
 
Materials and Methods: Treatments included exogenous application of cinnamic acid at four levels (control, 100, 200 and 400 μM trans cinnamic acid) and storage time at five times (0, 4, 8, 12 and 16 days after storage). Cinnamic acid treatment at the mentioned concentrations was applied by top application 24 hours before mushroom harvest. Distilled water was used for control treatment. At the time of picking, infected, very large and small mushrooms were removed and the same mushrooms with a cap diameter of 40 to 45 mm were collected for each experimental treatment. After harvesting, the mushrooms were placed in a polyethylene box covered with cellophane and after weighing, they were transferred to an incubator at 4°C. In the post-harvest period, different traits were measured with a four day interva.
 
Results and Discussion: The results showed that by increasing storage time, the activity of polyphenol oxidase and peroxidase increased and consequently the browning of the tissue also had an increasing trend. Also, with increasing storage time, weight loss percentage, hydrogen peroxide and malondialdehyde increased and total phenol and total antioxidant capacity were decreased. The use of cinnamic acid treatment in all three concentrations (100, 200 and 400 μM) reduced the activity of peroxidase and polyphenol oxidase activities and reduced tissue browning. The application of cinnamic acid also improved the quality traits of edible mushrooms such as total phenol, total antioxidant capacity and visual quality index. These findings suggest that application of cinnamic acid, especially at a concentration of 400 μM, could have the potential of inhibiting tissue browning and thus maintaining the mushrooms quality at the postharvest period 

کلیدواژه‌ها [English]

• Antioxidant capacity
• Polyphenol oxidase
• Tissue browning
• Total phenol
• Weight loss

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