Public PhD defense - Msc. Yang Zou

11-05-2021 from 15:30 to 18:30
Online defense
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The Chancellor of Ghent University has the honour of inviting you to attend the public defense of the doctoral dissertation of
MSc. Yang Zou

Title of the doctoral dissertation:
The valorization potential of biologically recovered chitin and bioactive hydrolysates from marine crustacean processing side streams.

The public defense will take place on 11/05/2021 at 15h30.

However, due to the strict government restrictions related to COVID-19, the public defense will be organized in such a way that you can follow the live defense online by this link 

Please dial in 5 minutes before the defense and turn off your camera to not disturb the jury members and the candidate during the defense.
We also kindly request you to take a photograph of you and the live-stream during the presentation and send it to

This will be very much appreciated.

Dissertation supervisors

Prof. dr. ir. Katleen Raes

Department of Food Technology, Safety and Health,
Faculty of Bioscience Engineering,
Ghent University, Belgium

Dr. Johan Robbens

Animal Sciences Unit, Cell Blue Biotech,

Flanders Research Institute for Agriculture, Fisheries and Food, Belgium

    Board of examiners

    Prof. dr. ir. Monica Höfte

    Department of Plants and Crops,
    Faculty of Bioscience Engineering, Ghent University, Belgium

    Prof. dr. ir. Erik Meers

    Department of Green Chemistry
    Faculty of Bioscience Engineering, Ghent University, Belgium

    Prof. dr. ir. Jana Asselman

    Department of Animal Sciences and Aquatic Ecology
    Faculty of Bioscience Engineering, Ghent University, Belgium

    Dr. Donatella de Pascale

    Department of Marine Biotechnology,
    Stazione Zoologica Anton Dohrn, Italy

    Dr. Patrice Behan

    School of Chemical and Pharmaceutical Sciences,
    Technological University Dublin, Ireland

    Abstract of the doctoral research

    Although marine crustaceans have a high economic value and a significant nutritional value, a considerable proportion of marine crustaceans cannot be directly consumed by humans, ending up as processing side streams in the seafood industry. These side streams still contain valuable molecules such as proteins, chitin, and carotenoids. Compared to traditional chemical methods, greener technologies are the alternatives to extract those compounds.
    The aims of this PhD thesis are: (1) to investigate the feasibility of marine crustaceans processing side streams (MCPS) valorization via biological processing techniques, namely enzymatic hydrolysis and fermentation, and (2) to characterize the fractions obtained after enzymatic hydrolysis and fermentation. In this PhD thesis, enzymatic hydrolysis with commercial proteases and fermentation with selected marine bacteria to valorize MCPS were studied. The significant findings are listed as follows: the brown crab processing side streams hydrolysates obtained after biological treatments expressed good antioxidant activity. Especially hydrolysates of fermentations using specific Pseudoaltermonas strains showed potent antibiofilm and anthelmintic activities. The chitin present in the press cakes had a high degree of acetylation, degree of deproteinization and thermal stability. The wet pellet fractions obtained after enzymatic hydrolysis from Northern shrimp processing side streams contained a high amount of carotenoids. These findings demonstrate that bioprocessing techniques are promising for the comprehensive valorization of MCPS.