ارزیابی شاخص‌های کیفی کیوی در فرآیند خشک شدن با خشک کن بستر ثابت مجهز به مواد تغییر فازدهنده

نویسندگان

1 گروه مهنذسی بیوسیستم، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران

2 گروه مهندسی بیوسیستم/دانشکده علوم کشاورزی/دانشگاه گیلان/رشت/ایران

3 گروه مهندسی بیوسیستم، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران

چکیده

میوه کیوی یکی از مهم ترین محصولات صادراتی کشور و استان گیلان است. صادرات این محصول اغلب با هدف تازه خوری است در صورتی که کیوی خشک شده علاوه بر کاهش قابل توجه هزینه حمل و نقل، ارزش افزوده بسیاری نیز می تواند به همراه داشته باشد. یکی از الزامات موفقیت در عرصه تولید و صادرات کیوی خشک، توجه به شاخص­های کیفی محصول پس از خشک شدن است که در این تحقیق مورد توجه قرار گرفته است. لذا هدف از این پژوهش، بررسی اثر دما (55، 65 و 75) و مواد تغییر فاز دهنده بر چهار شاخص کیفی ورقه­های نازک کیوی شامل تغییرات رنگ، میزان pH، درصد چروکیدگی و بازارپسندی و میزان مطلوبیت مصرف کننده می­باشد. با ترکیب متغیرهای مستقل مجموعاً شش تیمار به دست آمد. فرآیند خشک کردن تحت پیش‌تیمار توان فروسرخ 250 وات، زمان فروسرخ 10 دقیقه، توان ریزموج 400 وات، زمان ریز موج 4 دقیقه و آنزیم بری در خشک کن بستر ثابت طبقاتی انجام شد. این مطالعه در قالب طرح بلوک‌های کامل تصادفی با چهار تکرار انجام شد. تجزیه و تحلیل داده‌ها در نرم افزار IBM SPSS Statistics 26 انجام گرفت. در پایان به منظور یافتن بهترین تیمار، از روش ادغامی کُپ لند استفاده شد. نتایج نشان داد بهترین تیمار از نظر تغییرات رنگ، دمای 75 - وجود PCM، از نظر میزان pH، دمای 65 - وجود PCM، دمای 65 - عدم وجود PCM و دمای 75 - عدم وجود PCM و از نظر درصد چروکیدگی دمای 75 - عدم وجود PCM، دمای 55 - عدم وجود PCM و دمای 75 - وجود PCM است. تیمار برتر در بخش بازارپسندی، دمای 75 - عدم وجود PCM است. بهترین تیمار به طور کلی از نظر 4 شاخص کیفی، دمای 75 - عدم وجود PCM است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Kiwi Quality Indicators in the Drying Process by a Fixed Bed Dryer Equipped with Phase Change Materials

نویسندگان [English]

  • Zahra Sheykhani nejad fallah 1
  • Morteza Zangeneh 2
  • Narges Banaeian 3
1 Department of Biosystems Engineering. Faculty of Agricultural Sciences. University of Guilan. Rasht.
2 Department of Biosystems Engineering, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran
3 Department of Biosystems Engineering, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran
چکیده [English]

Kiwi fruit is one of the most important export products of the country and Gilan province. The export of this product is often for fresh consumption, while dried kiwi can bring a lot of added value in addition to significantly reducing the cost of storage and transportation. One of the requirements for success in the field of dry kiwi production and export is to pay attention to the quality indicators of the product after drying, which is considered in this research. Aim of this research is the investigation of temperature (55, 65 and 75 ℃) and Phase Change Material (PCM) effect on four quality indicators of thin slices of kiwifruit including color changes, pH level, shrinkage percentage, marketability and consumer desirability. A total of six treatments were obtained by combining the independent variables. The drying process was carried out under the pretreatment of infrared power of 250 W, infrared time of 10 minutes, microwave power of 400 W, microwave time of 4 minutes and enzyme removal in a layered fixed bed dryer. This study was conducted as a randomized complete block design with four replications. Data analysis was done in IBM SPSS Statistics 26 software. In the end, in order to find the best treatment, Copeland integration technique was used. The results showed that the best treatment in terms of color changes is 75 ℃ - PCM, in terms of pH level is 65 ℃ - PCM, 65 ℃ - no PCM and 75 ℃ - no PCM and in terms of shrinkage percentage is 75 ℃ -no PCM, 55 ℃-no PCM and 75 ℃ - PCM. The superior treatment in the marketability section is 75℃- no PCM. The overall best treatment in terms of four quality indicators is 75℃- no PCM.

کلیدواژه‌ها [English]

  • Color Changes
  • Marketability and Consumer Desirability
  • pH Level
  • Shrinkage Percentage
  • Temperature
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