تاثیر تیمار فراصوت برروی رنگ، محتوی فنلی، فلاونوئیدها و پروفایل قند آب لیمو ترش جهرمی

نوع مقاله : مقاله علمی - پژوهشی

نویسنده

پژوهشگاه استاندارد، پژوهشکده صنایع غذایی و فراورده های کشاورزی، گروه پژوهشی مواد غذایی، کرج، ایران

چکیده

مقدمه: با افزایش دانش مصرف کنندگان در خصوص بحث سلامت و تغذیه، مصرف کنندگان در کنار افزایش ماندگاری فراورده های غذایی خواهان حفظ کیفیت اولیه محصول فراوری شده می­باشند. برای رسیدن به این هدف محققان به دنبال فرآیندهای غیر حرارتی هستند یکی از این فرآیندهای غیر حرارتی نو ظهور، تیمار فراصوت است.
مواد و روش­ها: تاثیر فرآیند حرارتی و تیمار فراصوت برروی ویژگی­های فیزیکی و شیمیایی (بریکس، pH، اسیدیته، عدد ابری شدن و هدایت الکتریکی)، شاخص­های رنگی، ترکیبات آنتی اکسیدانی وفعالیت آنتی اکسیدانی، پروفایل قندها، شاخص قهوه ای شدن و مقدار هیدورکسی متیل فورفورال آب لیموترش جهرمی مورد بررسی قرار گرفت.
یافته ها: نتایج نشان داد که پاستوریزاسیون معمولی و تیمار فراصوت تاثیر معنی داری برروی اسیدیته، pH، بریکس، قندها و مقدار هیدروکسی متیل فورفورال ندارد. فرآیند حرارتی باعث کاهش قابل ملاحظه­ای در میزان ترکیبات آنتی اکسیدانی وفعالیت آنتی اکسیدانی شد. در حالی که در آب لیموترش با تیمار فراصوت به مدت 90 دقیقه بیشترین مقدار ترکیبات آنتی اکسیدان در مقایسه با سایر تیمارها مشاهده شد. همچنین تفاوت معنی داری در مورد شاخص­های رنگی بین تیمارفراصوت و فرایند حرارتی وجود نداشت.
نتیجه گیری: فرآیند پاستوریزاسیون معمول منجر به کاهش کیفیت در آب میوه گردید. در صورتی که تیمار فراصوت به مدت 90 دقیقه باعث افزایش قابل ملاحظه­ای در مقدار عدد ابری شدن، ترکیبات آنتی اکسیدانی و فعالیت آنتی اکسیدانی این آب میوه شد. بنابراین تیمار فراصوت می تواند به دلیل برتری در حفظ و نگهداری ترکیبات مغذی جایگزین خوبی برای روش پاستوریزاسیون معمول باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Effects of Ultrasound Treatments on Color, Antioxidant Compounds, Sugar Profile of Jahrom Lime Juice

نویسنده [English]

  • Z. Alaei Roozbahani
Department of Food Science and Technology, Standard Research Institute (SRI), Karaj, Iran
چکیده [English]

Introduction: Concerning the increase of consumers' knowledge about health and nutrition, consumers, along with increasing the shelf life of food products, want to maintain the original quality of the processed product. Sonication might be recognized as a potential technique to improve improvement in the quality of fruit juices.
Materials and Methods: The influence of thermal treatment and sonication on Physicochemical properties (°Brix, pH, electrical conductivity, cloud value and acidity), colour values, antioxidant compounds and activity (total phenolics, ascorbic acid, flavonoids, free radical scavenging activity), sugar profile, browning index and 5-hydroxymethylfurfural content were investigated.
Results:  The results indicated that conventional pasteurization and sonication treatment did not show any significant changes in pH, acidity value, Brix, sugar and 5-HMF contents of juice, and however, a rise in cloud value and electrical conductivity and browning index were observed under all processing conditions. The thermal treatment caused the decrement in the bioactive compounds and antioxidants activity whereas sonication treatment for 90 min increased the maximum activity of bioactive compounds and antioxidants as compared to other treatment conditions and control. Some differences in all the colour values were also observed.
Conclusion: thermal treatment causes decline in quality parameters of lime juice, whereas the significant increment in bioactive compounds and antioxidant activity was observed in juice samples after being exposed to sonication treatment. Therefore, ultrasound treatment might be considered as a good alternative to the thermal treatment in beverage industry.

کلیدواژه‌ها [English]

  • Antioxidant Activity
  • Lime Juice
  • Pasteurization
  • Sugar Profile
  • Ultrasonic
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