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مطالعه ویژگیهای شیمیایی و میکروبی پنیر کوارک پروبیوتیک حاوی لاکتوباسیلوس اسیدوفیلوس و لاکتوباسیلوس کازئی | ||
| مهندسی بیوسیستم ایران | ||
| مقاله 11، دوره 50، شماره 2، شهریور 1398، صفحه 375-388 اصل مقاله (1.26 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijbse.2019.270715.665124 | ||
| نویسندگان | ||
| مارال سلطان زاده1؛ جواد حصاری2؛ سیدهادی پیغمبردوست* 3 | ||
| 1دانش آموخته کارشناسی ارشد، گروه علوم و مهندسی صنایع غذایی، دانشکده کشاورزی، دانشگاه تبریز، تبریز | ||
| 2استاد تکنولوژی مواد غذایی، گروه علوم و مهندسی صنایع غذایی، دانشکده کشاورزی، دانشگاه تبریز، تبریز | ||
| 3استاد تکنولوژی مواد غذایی، گروه مهندسی علوم و صنایع غذایی، دانشکده کشاورزی، دانشگاه تبریز | ||
| چکیده | ||
| هدف از انجام این تحقیق بررسی ویژگیهای شیمیایی و میکروبی پنیر کوارک حاوی لاکتوباسیلوس اسیدوفیلوس (LA) و لاکتوباسیلوس کازئی (LC) طی مدت 21 روز نگهداری بود. نتایج نشان داد که pH پنیر کوارک LC نسبت به نمونه کنترل و LA به طور معنیداری پایینتر بود. pH همه پنیرهای مورد آزمون با گذشت زمان بهطور معنی داری کاهش یافت. تغییرات اسیدیته بین تیمارها و تفاوتهای بین آنها بارزتر از تفاوتهای pH بود. ازت محلول در هفته سوم نگهداری در پنیر LC نسبت به LA و کنترل افزایش معنیداری یافت و با گذشت زمان از روز هفتم تا بیست و یکم، مقدار ازت محلول در همه نمونههای پنیر بهطور معنیداری افزایش یافت. با گذشت زمان نمونه کنترل نسبت به دو نمونه پروبیوتیک LC و LA، اندیس لیپولیز بیشتری نشان داد. تعداد کلیفرمها در همه نمونههای پنیر کنترل و بویژه پنیرهای پروبیوتیک ناچیز و کمتر از 10 cfu/g بود. تعداد کپک و مخمر پنیرهای کنترل بهطور معنیداری بیشتر از نمونههای پروبیوتیک بود. نتایج شمارش لاکتوباسیلها در نمونههای پنیر پروبیوتیک در روزهای نگهداری مختلف نشان داد که در روز اول ارزیابی تعداد هر دو باکتری تلقیح شده 5/8 تا 6/8 log CFU/g بود. زمان ماندگاری پنیر تا 21 روز اثر معنی داری بر کاهش تعداد لاکتوباسیلها نداشت و در مورد هر دو باکتری تعداد باکتریهای شمارش شده بالاتر از 8 log CFU/g باقی ماند. پنیر کوارک بستر مناسبی برای افزودن سویههای پروبیوتیک ارائه نمود که طی مدت نگهداری تا 21 روز باعث محافظت این سویهها شد و پنیر حاصله در این مدت ویژگیهای شیمیایی مطلوب خود را حفظ نمود. | ||
| کلیدواژه‌ها | ||
| پنیر نرم؛ پروبیوتیک؛ کیفیت؛ اسید چرب آزاد | ||
| عنوان مقاله [English] | ||
| Study of Chemical and Microbial Properties of Probiotic Quark Cheese Containing Lactobacillus Acidophilus and Lactobacillus Casei | ||
| نویسندگان [English] | ||
| Maral Soltanzadeh1؛ Javad Hesari2؛ Seyed Hadi Peighambardoust3 | ||
| 1MSc student, Department of Food Science, College of Agriculture, University of Tabriz, Tabriz | ||
| 2Professor of Food Technology, Department of Food Science, College of Agriculture, University of Tabriz, Tabriz | ||
| 3Professor of Food Technology, Department of Food Science, College of Agriculture, University of Tabriz | ||
| چکیده [English] | ||
| The aim of this study was to investigate chemical and microbial properties of probiotic Quark cheese containing L.acidophilus (LA) and L.casei (LC) during 21 days of storage. Results showed that LC sample had significantly lower pH than that of both LA and control. pH values of all samples decreased significantly upon storage time. Treatable acidity changes in cheese sample was similar to pH change, although acidity differences between samples was more enhanced than pH variation. There was a significant increase in soluble nitrogen of LC sample compared to that of LA and control in Day 21. Increasing storage time from 7 to 21 days, significantly increased the soluble nitrogen content of all cheese samples. Increasing storage time significantly increased lipolysis index of control compared to probiotic chees samples. Coliform counts was negligible in all samples and was below 10 log CFU/g in probiotic cheese samples. Yeast and mold counts of control was significantly higher than that of probiotic samples. Lactobacilli count results indicated that the number of viable bacteria in both probiotic cheese samples was 8.5-8.6 log CFU/g in day 1. Increasing storage time up to 21 days did not significantly (p<0.05) decrease the number of lactobacilli and in both probiotic samples it remained above 8 log CFU/g. Quark cheese provided a good substance for the incorporation of probiotic strains. Storage of quark cheese until 21 days preserved probiotic bacteria and resulted in the desired chemical properties. | ||
| کلیدواژه‌ها [English] | ||
| Soft cheese, Probiotic, Quality, Free fatty acids | ||
| مراجع | ||
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