با همکاری انجمن علوم و صنایع غذایی ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه فردوسی مشهد

چکیده

دراین پژوهش از روش سطح پاسخ به منظور تعیین مقادیر بهینه آنزیم پکتیناز، بنتونیت و پلی وینیل پلی پرولیدون جهت شفاف سازی و پایداری آب کیوی استفاده گردید. نتایج نشان داد که جهت شفاف سازی آب کیوی مقدار بهینه آنزیم پکتیناز g/kg83/5، بنتونیت g∕Ton05/306 و پلی وینیل پلی پرولیدون g∕100 lit 70 می باشد. با افزودن این مواد، میزان کدورت کاهش و شفافیت افزایش یافت. در نهایت از مقدار مواد فنولی نیز کاسته شد. افزایش غلظت بنتونیت و پلی وینیل پلی پرولیدون باعث کاهش میزان ویسکوزیته آب کیوی گردید. افزایش غلظت آنزیم ازg∕kg 5-2 نیز باعث کاهش چشمگیر در ویسکوزیته آب کیوی شد. ضریب تبیین (R2) برای ویسکوزیته ،کدورت، شفافیت ومیزان کل ترکیبات فنولی بیش از 90/0 بود که حاکی از مناسب بودن مدل مورد استفاده جهت برازش داده می باشد. ویسکوزیته، کدورت وشفافیت به غلظت آنزیم و بنتونیت بودند وابسته بودند. اثر پلی وینیل پلی پرولیدون بر مقدار کل ترکیبات فنولی نیز معنی دار بود.

کلیدواژه‌ها

عنوان مقاله [English]

Optimization of Kiwifruit Juice Clarification Using Pectinase Enzyme, Bentonite and Polyvinyl Polypyrolidone

نویسندگان [English]

  • Arash Koocheki
  • Seyed Ali Mortazavi

ferdowsi

چکیده [English]

In order to prevent the turbidity during storage of kiwifruit juice, clarification is necessary. Through proper clarification, flavor and taste of the product is also improved. Therefore, the purpose of the present study was to present a method to determine the optimum amount of clarifying agents (Pectinase enzyme, Bentonite and polyvinyl poly pyrolidone) for producing kiwifruit juice with stable clarity. For this purpose, effect of Pectinase enzyme (2-8 g/kg), Bentonite (200-350 g/Ton) and polyvinyl poly pyrolidone (70-110 g/100 lit) on viscosity, turbidity, clarity and total phenolics compound of kiwifruit juice was investigated. For each response a second order polynomial model was developed using a multiple linear regression analysis. Results showed that R2 for viscosity, turbidity, clarity and the total amount of phenolics were more than 0.90. The statistical analysis indicates that viscosity, turbidity and clarity (P

کلیدواژه‌ها [English]

  • Clarification
  • Kiwifruit juice
  • Pectinase enzyme
  • bentonite
  • Polyvinyl Polypyrolidone
  • Response surface methodology
استاندارد ملی ایران شماره 2685. روش های آزمون آب میوه ها، موسسه استاندارد و تحقیقات صنعتی ایران.
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