تاثیر مالتودکسترین حاصل از نشاسته ذرت بر ویژگیهای شیمیایی، حسی و ریزساختار پنیر سفید فراپالایشی کم چرب

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری

2 هیات علمی دانشگاه

3 مدیر گروه صنایع غذائی

4 هیات علمی صنایع غذائی

چکیده

تقاضا برای مصرف محصولات لبنی کم­چرب از جمله پنیرهای کم­چرب به‌طور روزافزون در حال افزایش است. با کاهش چربی، پنیر از لحاظ ویژگی­های فیزیکوشیمیائی و حسی دچار نقصان خواهد شد، ولی با استفاده از جایگزین­های چربی این مشکل تا حدی برطرف می­شود. در این پژوهش مالتودکسترین (16 DE =) به­عنوان جایگزین چربی در پنیر فراپالایشی کم­چرب مورد استفاده قرار گرفت. محلول شیری مالتودکسترین 25% (وزنی/وزنی) در سطح 15 و 50% (وزنی/وزنی) جایگزین چربی در پنیر شد و ویژگی­های شیمیایی (pH، ماده خشک، چربی، WSN/TN% و NPN/TN)، حسی و ریزساختار این پنیرها در مدت 2 ماه نگه‌داری در دمای  ° C8  در مقایسه با پنیر فراپالایش با چربی کامل (شاهد) مورد ارزیابی قرار گرفت. نتایج حاصل از تجزیه آماری داده­ها نشان داد که تاثیر متقابل زمان رسیدن و نوع تیمار بر pH، ماده خشک، چربی و پروتئولیز (WSN/TN% و NPN/TN) معنی‌دار بود (P<0.05). از لحاظ ویژگی­های حسی، مقبولیت کلی هر دو تیمار در مقایسه با نمونه شاهد تایید شد. بیش‌ترین و کم‌ترین مقبولیت کلی به­ترتیب مربوط به نمونه شاهد و تیمار با 15% کاهش چربی بود. مقبولیت کلی تیمار با 50% کاهش چربی کم‌تر از نمونه شاهد، ولی قابل رقابت با آن بود. با بررسی میکروگراف­های میکروسکوپ الکترونی روبشی مشخص شد که در تیمارهای حاوی مالتودکسترین، با کاهش بیش‌تر چربی و افزایش مالتودکسترین تراکم ساختار پروتئینی کم‌تر شد. ریز­ساختار تیمار با 50% کاهش چربی و نمونه شاهد در پایان روز 60 رسیدگی نسبت به روز 32 بازتر شده بود، ولی در تیمار با 15% کاهش چربی متراکم‌تر شده بود. به­طور کلی، با توجه به نتایج حسی، جنبه­های اقتصادی و در راستای حفظ سلامت جامعه، تیمار با 50% کاهش چربی به­عنوان تیمار برتر انتخاب شد. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effects of maltodextrin on Physicochemical and sensory properties and microstructure of low fat ultrafiltred Feta cheese

چکیده [English]

Demand for low-fat dairy such as low-fat cheeses is increasingly on the rise. Cheese will be impaired with fat loss in physicochemical and sensory properties, but this problem can partially be resolved using the fat replacers. In this study, maltodextrin (DE = 16) was used as a fat replacer in low fat UF cheese. Milky maltodextrin solution 25% (w / w) was  fat replacement in cheese in the levels of 15 and 50% (w / w) and chemical properties (i. e. pH, dry matter, fat, WSN / TN, and NPN / TN), sensory properties and microstructure of cheese were evaluated in storage for 2 months at 8ᵒC, in comparison to full fat UF cheese (control). The results of the statistical analysis of data showed that the interaction of ripening time and type of treatment on pH, dry matter, fat and proteolysis (WSN / TN and NPN / TN %) (P <0.05) was significant. With regarding to sensory properties, overall acceptability of both treatments compared with control sample was confirmed. The highest and lowest overall acceptability was the control sample and 15% fat reduced treatment respectively. The overall acceptability of 50% fat reduced treatment was less than the control sample, but comparable with it. Investigation of scanning electron microscope micrographs showed that reducing fat and increasing maltodextrin decreased density of protein structure in treatments containing maltodextrin. Microstructure of 50% fat reduced treatment and control at the end of 60 days of ripening compared to day 32 had been more open, but 15% fat reduced treatment had been denser. In general, according to sensory results, economic aspects, and in order to protect public health, 50% fat reduced treatment was selected as the best treatment.

کلیدواژه‌ها [English]

  • Low-fat feta cheese
  • Maltodextrin
  • Fat replacer
  • Ultrafiltration
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