بررسی کاربرد عصاره روناس به عنوان رنگ طبیعی بر ویژگی های کیفی دسر شیری طعم دار

نویسندگان
1 دانش آموخته کارشناسی ارشد، گروه علوم و صنایع غذایی، واحد شهر قدس، دانشگاه آزاد اسلامی، تهران، ایران
2 استادیار، گروه صنایع غذایی و تبدیلی، پژوهشکده فناوری های شیمیایی، سازمان پژوهش های علمی و صنعتی ایران، تهران
3 استادیار، گروه علوم و صنایع غذایی، واحد شهر قدس، دانشگاه آزاد اسلامی، تهران، ایران
چکیده
طی دهه‌های گذشته، رنگ‌های مورد استفاده در صنایع غذایی به دلیل افزایش حساسیت‌ جهانی نسبت به سلامت غذای انسان، مورد ظن بسیاری واقع شده و از این رو، محققان بسیاری تلاش نمودند تا انواع رنگ‌های خوراکی را از منابع طبیعی استخراج نمایند. یکی از این منابع طبیعی، ریشه گیاه روناس (Rubia tinctorum) است که حاوی با دوام‌ترین رنگدانه قرمز طبیعی به نام آلیزارین می باشد. در تحقیق حاضر، از عصاره روناس به عنوان رنگ طبیعی در سطوح 2، 3 و 4% و پکتین به عنوان جایگزین ژلاتین در نسبت‌های 3: 0، 5/1: 5/1و0: 3% در دسر شیری طعم‌دار استفاده و ویژگی‌های کیفی آن طی دوره نگهداری 15 روزه مورد ارزیابی قرار گرفت. نتایج حاصل نشان داد که با افزایش غلظت عصاره روناس با نسبت‌های مختلف ژلاتین: پکتین، ماده خشک و هم‌چنین pH نمونه‌های دسر شیری به طور معنی‌داری تغییر یافت (05/0>p) و پس از 15 روز نگهداری، روند افزایشی در pH مشاهده گردید. ارزیابی خصوصیات بافتی نمونه‌ها نیز نشان داد که نمونه‌های با نسبت 3: 0 ژلاتین: پکتین، دارای بافت سفت‌تری از بقیه نمونه‌ها بوده و پس از 15 روز نگهداری، کم‌ترین تغییرات بافتی، تحت تاثیر آب‌اندازی را از خود نشان دادند (05/0>p). ارزیابی حسی حاکی از آن بود که افزودن عصاره روناس در بیشترین مقدار مورد بررسی (4%) و از لحاظ ویژگی رنگ، در تمامی نمونه‌های دسر شیری مطلوب‌تر از سایرین بوده و تاثیر منفی بر روی سایر شاخص‌ها نظیر بو، مزه، شکل ظاهری، بافت و پذیرش کلی نداشته است. مطابق با داده‌های بدست آمده در این تحقیق می‌توان نتیجه گرفت که از ترکیب 3% ژلاتین همراه با 4% عصاره روناس در دسر شیری طعم‌دار، می توان علاوه بر بهبود ویژگی‌های کیفی محصول، از بازارپسندی و ماندگاری آن نیز اطمینان حاصل نمود.
کلیدواژه‌ها

عنوان مقاله English

Studying the Madder extract application as a natural colorant on qualitative properties of flavoured milk-based dessert

نویسندگان English

Samaneh Kabiri 1
Somayeh Rahimi 2
Vajiheh Fadaei Noghani 3
1 MSc Graduated, Department of Food Science & Technology, Shahr-e-Qhods Branch, Islamic Azad University, Tehran, Iran
2 Assistant Professor, Food Technology, Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
3 Assistant Professor, Department of Food Science & Technology, Shahr-e-Qhods Branch, Islamic Azad University, Tehran, Iran
چکیده English

In the past decades, Food colorants which are used in food industries are suspected due to the increased world sensitivity against the health of human diet; hence, many of researchers tried to extract the edible colorants from natural resources. One of the natural resources is the root of madder (Rubia tinctorum) which has the most stable natural red pigment, Alizarin. In this research the madder extract as natural colorant at 2, 3 and 4% and pectin as a replacer for gelatin at 3:0, 1.5:1.5 and 0:3% were used in flavoured milk- based dessert and their various qualitative parameters were evaluated during 15 days of storage. The results showed that increasing of madder extract with various ratios of gelatin: pectin, changed the dry matter and pH of the specimens significantly (p<0.05) and after 15 days, the pH raised up clearly. The texture evaluation showed that in the samples containing 3:0 gelatin: pectin, were more rigid than the others and demonstrated the least textural changes during 15 days according to the lower syneresis (p<0.05). The results of sensory evaluation showed that the addition of madder extract at its maximum level (4%), had the best results about the color, in the viewpoint of panelists and had no side effects on other parameters like odor, taste, apparent shape, texture and overall acceptance. Totally and according to the results, it can be concluded that by addition of 3% of gelatin along with 4% of madder extract in flavoured milk- based dessert, the qualitative parameters can be improve along with more shelf life and marketability, too.

کلیدواژه‌ها English

Rubia tinctorum
Flavoured milk-based dessert
Natural colorant
Pectin
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