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2012 | 11 | 1 |
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Shelf-life determination of brined Golden mullet Liza aurata during vacuum refrigerated storage using some quality aspects

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Treść / Zawartość
Warianty tytułu
PL
Wpływ opakowania próżniowego i przechowywania chłodniczego na trwałość tuszek solonego cefala złotogłowego (Liza aurata)
Języki publikacji
EN
Abstrakty
EN
Background. Salted fish products are popular in many countries around the world. Salting is one of the oldest techniques for fish preservation, and is essentially intended to increase the shelf-life of the product depressing water activity by means of dehydration and salt uptake by the fish muscle. However, the current demand for salted fish is driven more by the flavour of the product than for preservation purposes. Vacuum-packaging represents a static form of hypobaric storage. It is widely used in the food industry because of its effectiveness in reducing oxidative reactions in the product at relatively low cost. Low temperature storage is one of the primary methods to maintain fish quality, based on the reduction in the rates of microbiological, chemical and biochemical changes. Material and methods. Fresh Golden mullets were rapidly beheaded, scaled, gutted and immediately washed with tap water then, samples were taken to the laboratory in ice box for chemical and microbial analysis of fresh fish, other samples were put in the brine (6 liter water and 2160 g salt was used for brine solution). After 14 days of brining, fish were taken out of brine solution and drained, then they were Vacuum Packed and labelled (each pack contained two fish about 1500 g weight). Ali the packs were stored in a refrigerator 4°C. Some quality aspects including Total Volatile Nitrogen (TVN), Peroxide Value (PV), Thiobarbituric Acid (TBA), Total Viable Count (TVC), Halophilic Bacteria (HB) and presence of Clostridium Botulinum were determined in fresh mullets, fresh brined mullets after 14 days of brining, and in (Vacuum Packed) VP samples stored at 4°C at intervals of 30, 60 and 90 days. Results. TVN increased from ten mg/100 g in fresh brined after 14 days to 30.80 mg/100 g in VP brined Golden mullet after 90 days of storage at 4°C, PV increased after brining from 1.50 meq/kg in fresh brined to 28.90 meq/kg in VP brined Golden mullet after 90 days of storage at 4°C, TBA increased from 0.07 mg MDA/kg in fresh brined to 0.10 after 60 days and then, decreased to 0.09 mg MDA/kg in VP brined Golden mullet after 90 days of storage and TVC decreased from 4.70 log CFU/gr in fresh brined to 4.40 log CFU/ gr after 30 days and then, increased to 5.70 log CFU/gr in VP brined Golden mullet after 90 days of storage at 4°C, FIB increased from 4.55 log CFU/gr in fresh brined to 6.30 log CFU/gr after 90 days of storage period at 4°C and exceeded the permissible level. Clostridium botulinum toxin was not detected in any of the samples throughout the storage. Conclusions. The results from this study clearly suggested that a combination of brining, vacuum packaging and storage at refrigerated temperature prolongs the shelf-life of Golden mullet to a great extent. Our findings revealed that the longest shelf-life was for VP brined Golden mullet stored at 4°C is 30 days.
PL
Wstęp. Solone produkty rybne są popularne w wielu krajach. Solenie jest jedną z najstarszych metod utrwalania poprzez zmniejszenie aktywności wody w wyrobie. Problemem jest smakowitość tych produktów. Pakowanie próżniowe jest przykładem przechowywania żywności w warunkach obniżonego ciśnienia. W tych warunkach można istotnie spowolnić procesy utlenienia. To stosunkowo tani proces. Równocześnie pozwala na spowolnienie niekorzystnych procesów mikrobiologicznych i biochemicznych. Materiał i metody. Świeże ryby były szybko odgławiane i patroszone. Tuszki po przemyciu pod bieżącą wodą umieszczano w pojemnikach z lodem. Część surowca przeznaczono do badań mikrobiologicznych i chemicznych, a resztę umieszczano w solance (6 1 wody + 2160 g soli kuchennej). Po 14 dniach tuszki były wyciągane z solanki, obsuszane i pakowane próżniowo (każda paczka zawierała dwie ryby o wadze ok. 1500 g). Wszystkie próbki przechowywano w temperaturze 4°C. W trakcie badań oceniano następujące wyróżniki: ogólną zawartość lotnych związków azotowych (TVN), liczbę nadtlenkową (PV), wartość TB A, ogólną liczbę bakterii (TVC), liczbę bakterii halofilnych (HB) oraz obecność Clostridium botulinum. Wyróżniki badano na każdym etapie oceny próbek. Wyniki. Zawartość lotnych związków azotowych wzrastała od 14 mg/100 g w surowcu przechowywanym przez 14 dni w solance do 30,80 mg/100 g w próbkach zapakowanych próżniowo i przechowywanych 90 dni w temperaturze 4°C. Wartość TBA wzrosła od 0,07 mg MDA/kg do 0,10 po 60 dniach i następnie zmniejszyła się do 0,09 MDA/kg po 90 dniach przechowywania w opakowaniu próżniowym. Podobnie zmienny wpływ czasu przechowywania zaobserwowano dla pozostałych ocenianych wyróżników. W żadnej z badanych próbek nie wykryto Clostridium botulinum. Wnioski. Wyniki badań wskazują, że połączenie solankowania, pakowania próżniowego i przechowywania w obniżonej temperaturze (4°C) znacznie przedłuża przydatność spożywczą badanych tuszek, aż do 30 dni.
Wydawca
-
Rocznik
Tom
11
Numer
1
Opis fizyczny
p.37-43,fig.,ref.
Twórcy
autor
  • Fisheries Department, Agriculture College, Islamic Azad University, Qaemshahr Branch, Iran
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Bibliografia
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