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تغییرات فیزیکی میوه زیتون و ویژگیهای فیزیکی و شیمیایی روغن زیتون فرابکر رقم روغنی کشت داده شده در استان گلستان طی دوره رسیدگی | ||
مهندسی بیوسیستم ایران | ||
دوره 52، شماره 1، اردیبهشت 1400، صفحه 95-106 اصل مقاله (970.33 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijbse.2020.302866.665310 | ||
نویسندگان | ||
جعفر قرگوزلو1؛ انوشه رحمانی2؛ مسعود هماپور3؛ لادن رشیدی* 4 | ||
1دانش آموخته کارشناسی ارشد، گروه علوم و صنایع غذایی، دانشگاه آزاد اسلامی- واحد صفادشت، کرج، ایران | ||
2استادیار، پژوهشکده صنایع غذایی و فراورده های کشاورزی، پژوهشگاه استاندارد ، کرج ، ایران | ||
3استادیار گروه علوم و صنایع غذایی، دانشگاه آزاد اسلامی- واحد صفادشت، کرج، ایران | ||
4استادیار گروه پژوهشی مواد غذایی ، پژوهشکده صنایع غذایی و فراورده های کشاورزی، پژوهشگاه استاندارد، کرج، ایران | ||
چکیده | ||
در این پژوهش، بهترین زمان برداشت میوه زیتون رقم روغنی استان گلستان، با بررسی ویژگیهای فیزیکی وشیمیایی روغن استحصال شده از آن در ماههای مهر، آبان و آذر تعیین شد. بیشترین نسبت میوه به هسته و میزان اسید اولئیک (60/62 درصد)، در دوره سوم برداشت به دست آمد. پس از آن، به ترتیب، اسید پالمیتیک (66/18 درصد)، اسید لینولئیک (33/16 درصد) و اسید استئاریک (3 درصد) بیشترین میزان اسیدهای چرب را داشتند. نسبت اسید اولئیک به اسید لینولئیک، میزان اسیدیته و مقدار فنول کل طی دوان رسیدگی روند افزایشی داشت. بیشترین ترکیب استرولی بتاسیتواسترول (از 22/83 الی 08/90 درصد) بود که به همراه عدد پراکسید ( از 05/2 الی 05/7 (meqO2/kg oil)) طی سه دوره برداشت روند نزولی داشت. با توجه به افزایش نسبت اسید اولئیک به اسید لینولئیک و نیز بالابودن نسبت کمپسترول به استیگمااسترول، بهترین زمان برداشت زیتون رقم روغنی استان گلستان، دوره سوم برداشت (آذر) تعیین شد. | ||
کلیدواژهها | ||
دوره رسیدگی؛ روغن زیتون بکر؛ زیتون؛ زمان برداشت | ||
مراجع | ||
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