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.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 546196
Title Water dynamics during solid-state fermentation by Aspergillus oryzae YH6
Author(s) Jin, Guangyuan; Zhu, Yang; Rinzema, Arjen; Wijffels, René H.; Ge, Xiangyang; Xu, Yan
Source Bioresource Technology 277 (2019). - ISSN 0960-8524 - p. 68 - 76.
DOI https://doi.org/10.1016/j.biortech.2019.01.038
Department(s) Bioprocess Engineering
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Aspergillus oryzae - Nuclear magnetic resonance (NMR) - Solid-state fermentation - Water activity - Water dynamics
Abstract

Water is crucial for microbial growth, heat transfer and substrate hydrolysis, and dynamically changes with time in solid-state fermentation. However, water dynamics in the solid substrate is difficult to define and measure. Here, nuclear magnetic resonance was used to monitor water dynamics during the pure culture of Aspergillus oryzae YH6 on wheat in a model system to mimic solid starter (Qu or Koji) preparation. During fermentation, overall water content gradually decreased from 0.84 to 0.36 g/g, and water activity decreased from 0.99 to 0.93. Water content in different state (bound, immobilized and free) changed differently and all moved to more “bound” direction. The internal water distribution over the substrate matrix also showed a faster reduction inward both in the radical and axial direction. Our findings provide the prerequisites for optimal processes where water dynamics in solid-state fermentation can be monitored and controlled.

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