Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 318787
Title Biological ensilage of fish : optimization of stability, safety and functionality
Author(s) Enes Dapkevicius, M.L.N.
Source University. Promotor(en): F.M. Rombouts; Rob Nout; J.H. Houben. - S.l. : [s.n.] - ISBN 9789058085702 - 170
Department(s) Food Microbiology Laboratory
Publication type Dissertation, externally prepared
Publication year 2002
Keyword(s) voedselmicrobiologie - kuilvoerbereiding - micromestistius poutassou - trachurus - scomber scombrus - biogene aminen - lipiden - eiwitafbraak - food microbiology - silage making - biogenic amines - lipids - protein degradation
Categories Fish and Fish Products
Abstract This thesis deals with stability, safety, and functionality aspects of biological fish silage (BFS) obtained by lactic acid fermentation. BFS may provide an economically viable, environment friendly way of upgrading fish waste.</p><p>BFS has been found advantageous when compared to the so-called acid process, since it yielded lower levels of peroxides in the silage oil and led to lower non-protein nitrogen values. Fermentation by lactic acid bacteria (LAB) was shown to efficiently inhibit pathogens such as <em>L. monocytogenes</em> and <em>E. coli</em> O157:H7 as well as some spoilage microorganisms. Histamine degradation by some of the most promising available LAB strains was also tested, as an innovative means of ensuring low levels of this amine in the fermented product. Several potential starter strains were found to degrade histamine as single strain cultures and could find application in fish silage and other fish products in which histamine accumulation might pose a certain risk.</p><p>Temperatures of 35 - 37°C were regarded as most suitable from the point of view of starter growth and acidification. Strains with a short acidification lag time, such as <em>Lb. plantarum</em> 009, or with very fast growth and good antibacterial properties, such as <em>Lb. curvatus</em> 15.35, are most suitable.</p><p>Sodium chloride inhibited growth of biogenic amine producing bacteria and additionally decreased non-protein nitrogen and total volatile basic nitrogen values in BFS. <em></em> Potassium sorbate was shown to inhibit growth and/or acidification by potential starter lactic acid bacteria.</p>
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