نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه علوم و صنایع غذایی، دانشگاه زنجان، زنجان، ایران

2 دانشیار، دانشگاه زنجان، زنجان، ایران.

چکیده

ازگیل (Mespilus germanica) یکی از میوه‌های بومی مناطق شمالی ایران است که علاوه بر مصارف خوراکی دارای کاربردهای فراوانی در درمان‌های خانگی است. پایین بودن عمر انبارمانی ازگیل و حساسیت زیاد آن به افت وزن و قهوه‌ای شدن، از محدودیت‌های این میوه برای ارائه به بازار است. هدف از تحقیق حاضر، بررسی تغییرات هندسی (استخراج شده از تصاویر)، تغییرات فیزیکی (ویژگی‌های بافتی و رنگی) و شیمیایی (مواد جامد محلول کل، اسیدیتۀ قابل تیتر و شاخص رسیدگی) ازگیل و تشخیص مرحلۀ رسیدن در دورۀ نگهداری با کمک ویژگی‌های یاد شده است. این ویژگی‌ها به سبب ارتباط مستقیم با کیفیت حسی و تاثیر بر سطح رسیدگی ازگیل، بااهمیت هستند. نتایج حاصل از این پژوهش نشان می­دهد که تمامی ویژگی‌ها مورد بررسی ازگیل در این دوره به­طور معنی‌دار (0.05 <p )  تغییر کرده­اند. نتایج همچنین مشخص می­کند که در دورۀ  نگهداری ازگیل در سردخانه، مقدار روشنایی (*L)، اسیدیتۀ قابل تیتر، سفتی بافت، زاویۀ رنگ و شاخص رسیدگی کاهش اما مقدار افت وزن، قرمزی (*a)، زردی (*b)، کروما، مواد جامد محلول کل و pH افزایش یافته است. با کمک شاخص رسیدگی می‌توان ازگیل را بر اساس زمان نگهداری به سه گروهازگیل تازه، ازگیل کامل رسیده و ازگیل بیش از حد رسیده تقسیم‌بندی کرد. نتایج پژوهش حاکی از ارتباط معنی‌دار (0.05<p ) بین مرحلۀ رسیدگی ازگیل و خصوصیات هندسی آن است. می‌توان از نتایج این پژوهش برای تحقیقات تکمیلی به­منظور ایجاد سیستم جداسازی و طبقه‌بندی ازگیل بر اساس ویژگی­های ظاهری و فیزیکی‌و‌شیمیایی استفاده کرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Assessment of Quality Changes of Medlar (Mespilus Germanica) During Ripening at Cold Storage

چکیده [English]

Medlar (Mespilus germanica) is widely cultivated in northern Iran and used as an edible fruit as well as home remedies. Short storage life of medlar fruit and its high susceptibility to weight loss and browning are the main limiting factors for its marketability. The aim of current work is to study geometrical (extracted from image), physical (texture and color) and chemical (titratable acidity) properties of medlar to determine the maturity and ripening stages. These parameters are of high importance due to their relation with sensorial quality and their effects on ripening level of medlar. The results revealed that none of the factors mensioned above were stable during the experiment. Result indicated that the lightness (L*), titratable acidity, firmness, h* and ripening index (RPI) decreased during medlar cold storage; while redness (a*), yellowness (b*), and C* values, total soluble solids and pH of medlar increased during this period. The use of the RPI made it possible to characterize three ripening stages (Fresh Medlar (FM), Ripe Medlar (RM), and OverRipe Medlar (ORM)) during the storage period of medlar. The results also showed that there was a significant relationship between ripeness stage and geometrical properties of medlar.

کلیدواژه‌ها [English]

  • Color features
  • Geometrical parameter
  • Physicochemical properties
  • Ripening index
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