با همکاری انجمن علوم و صنایع غذایی ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه تربیت مدرس

چکیده

در این پژوهش عصاره چای سبز به‌وسیله آب استخراج گردیده و پس از غوطه‌وری ماهیان به دو صورت کامل و شکم خالی در محلول 600 ppm به مدت 90 دقیقه، اثر عصاره مذکور برکیفیت ماهی قزل‌آلای رنگین کمان به هنگام نگهداری در یخ مطالعه گردید. شاخص ‌های شیمیایی و میکروبی فساد چربی شامل عدد پراکسید (Peroxide) تیوبار‌بیتوریک اسید‌(Thiobarbituric acid) ، اسید های‌ چرب ‌آزاد‌(Free fatty acid) ، مجموع بازهای نیتروژنی فرار (Total Volatile Basic Nitrogen)، شمارش کل باکتری‌ها (Total Viable Counts) و شمار باکتری‌های سرمادوست (Pseudomonas viable count) و همچنین ارزیابی حسی در زمان‌های 0، 4، 8، 12 و 16 روز پس از یخ‌گذاری اندازه‌گیری و با نمونه شاهد مقایسه شدند. براساس نتایج آماری در طی دوره نگهداری، مقادیر شاخص‌های PV، FFA، TBA، TVB-N، TVC و PVC نمونه‌های غوطه‌ور شده در عصاره چای سبز، در مقایسه با نمونه شاهد به شکل معنی‌داری کمتر بود و غوطه‌وری به صورت ماهی شکم خالی در عصاره چای سبز موجب تاخیر بیشتر در روند اکسیداسیون چربی و فساد میکروبی شد. نتایج ارزیابی حسی نشان‌دهنده عدم وجود اختلاف معنی‌دار بین تیمارهای مختلف بود. به عنوان یک نتیجه‌گیری کلی غوطه‌وری ماهی قزل‌آلای شکم خالی در در غلظت ppm 600 عصاره چای سبز، جهت جلوگیری و تاخیر فساد میکروبی و اکسیداسیون چربی به هنگام نگهداری در یخ توصیه می ‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Dipping Whole and Gutted Rainbow Trout (Oncorhynchus mykiss) in Green Tea Extract on Shelf life Quality during Storage in Ice

نویسندگان [English]

  • Behrouz Mohammadzadeh
  • Masoud Rezaei

Tarbiat Modares University

چکیده [English]

In this research green tea extract was prepared with water and then fishes in whole and gutted fish form was dipped in solutions of green tea extract (600 ppm) for 90 minutes and then were icing. During storage period (16 days), spoilage oxidation (PV, FFA, and TBA), spoilage microbial indices (TVB-N, TVC, PVC) and Sensory assessment with interval of 4 days were measured and compared with control treatment. Based on obtained results in all of treatments by passing time the value of all of the indexes (PV, FFA, TBA, TVB-N, TVC and PVC) increased significantly (P < 0/05). But this increase in treatments dipped in 600 ppm solution was performance slowly. Also in gutted fish form was caused higher delay in lipid oxidation and spoilage microbial relate to whole fish form. According sensory assessment results not significantly different among treatments (P > 0/05). In conclusion Obtained results showed that green tea extract with dipping gutted fish in consternation of 600 ppm was suggested for retardation of lipid oxidation and microbial spoilage in rainbow trout during storage in ice.

کلیدواژه‌ها [English]

  • Green tea extract
  • Rainbow trout (Oncorhynchus mykiss)
  • Gutting
  • storage in ice
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