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Viability of Ascocotyle (Phagicola) longa (Trematoda: Heterophyidae) metacercariae from mullets (Mugil liza) from Rio de Janeiro, Brazil after exposure to freezing and heating in the temperature range from −35 °C to 180 °C

Borges, Juliana Novo; Lopes, Karina Corrêa; Santos, Cláudia Portes

Food control. Volume 89 (2018); pp 117-122 -- Elsevier Science

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  • Title:
    Viability of Ascocotyle (Phagicola) longa (Trematoda: Heterophyidae) metacercariae from mullets (Mugil liza) from Rio de Janeiro, Brazil after exposure to freezing and heating in the temperature range from −35 °C to 180 °C
  • Author: Borges, Juliana Novo;
    Lopes, Karina Corrêa;
    Santos, Cláudia Portes
  • Found In: Food control. Volume 89 (2018); pp 117-122
  • Journal Title: Food control
  • Subjects: Aliments--Analyse--Périodiques; Aliments--Industrie et commerce--Qualité--Contrôle--Périodiques; Aliments--Qualité--Périodiques; Hygiène alimentaire--Périodiques; Electronic journals; Food handling--Periodicals; Food industry and trade--Quality control--Periodicals; Food--Analysis--Periodicals; Food--Quality--Periodicals; Food handling; Food--Analysis; Food--Quality; Periodicals; Trematode--Food safety--Temperature--Fish; Dewey: 664.07
  • Rights: legaldeposit
  • Publication Details: Elsevier Science
  • Abstract: Abstract:

    The presence of trematodes in fish products is a problem of concern to health authorities because of the potential hazards. Viability studies of heterophyid metacercariae are still scarce and lack methodological standardization. In this study of the heterophyid trematode Ascocotyle ( Phagicola ) longa, we isolated metacercariae from Mugil liza and conducted a controlled experiment to test the effects of heating or freezing mullet musculature on the survival of the metacercariae. The parasites were incubated in mullet muscle tissue at different temperatures, ranging from −20 °C to 180 °C, for different intervals. The physical damages were evaluated through SEM images. The estimated number of metacercariae in mullets was 514 in 308 g of musculature. Control metacercariae (no freezing or heating) were highly motile and showed no external damage after excystation with trypsin. All metacercariae were dead after heating for 15 min at 60 °C, 100 °C and 180 °C. For freezing temperatures, all metacercariae died after two hours of exposure to −35 °C and −20 °C, but 24 h of exposure to −10 °C was necessary to kill all metacercariae present in the fillets. The SEM images showed damage to the tegument of A . ( P .) longa exposed to heating and freezing temperatures that included some cracks and areas of spine loss. Parasites exposed to extreme temperatures also seemed to shrink. According to our results, the recent update of Brazilian law on food safety with specific procedures for inactivation of parasites was important to prevent outbreaks of trematodiases caused by Ascocotyle ( P .) longa.

    Highlights:

    Standardized test of A. ( P. ) longa viability was conducted at different temperatures.

    Metacercariae were dead after two hours of incubation at most temperatures tested.

    Metacercariae are tiny, translucent, and not visible by naked eye in the musculature.


  • Identifier: System Number: LDEAvdc_100086669660.0x000001; Journal ISSN: 0956-7135; 10.1016/j.foodcont.2017.11.037
  • Publication Date: 2018
  • Physical Description: Electronic
  • Shelfmark(s): ELD Digital store

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