Microbiology Session
Deliang Wang, China National Institute of Food and Fermentation Industries
Co-author(s): Yue Yuan, Division of Food Sciences, Xinjiang
Agricultural University, China; Zhiping Lin and Jiafeng Chao, Technical
Research Center of Beijing Yanjing Brewery Group Co. Ltd., China
ABSTRACT: Filamentous fungi infections in malting barley
can have severe effects on malt quality and fermentation performance of
brewing yeast, such as reduction of barley germination rate, induction
of premature yeast flocculation (PYF), beer gushing, and off-flavors. In
addition, most filamentous fungi, especially Fusarium, can
produce a series of mycotoxin in barley (deoxynivalenol [DON],
nivalenol, T-2, HT-2, diacetoxyscirpenol, zearalenone, aflatoxins,
ochratoxin A, and fumonisins), and they may have a great negative
influence on malt quality and food safety. In this study, the antifungal
protein (AFP) was isolated from the fermentation supernate of Aspergillus giganteus
identified by a series of experiments, such as morphologic observation
and molecular biology. Its application and the influence of AFP on
malting were analyzed on laboratory and pilot scales. And, its
parameters from corresponding beer production were also tested. Results
showed that AFP can effectively and significantly inhibit the growth of
most kinds of filamentous fungi on barley and reduce both the residues
of mycotoxin and corresponding gushing potential; however, in comparison
to the control, the data also showed that its application has no
negative effects on fermentation performance during beer production.
Deliang
Wang is the director of the Brewing Engineering Technology Department
(BETD), a subdivision of the China National Research Institute of Food
& Fermentation Industries (CNRIFFI). Since Deliang graduated, he has
been acting as an applied scientist presiding over the technical
consultants and cooperative projects with many large Chinese breweries,
such as Anheuser-Busch InBev, Yanjing brewery (top 8 in the world),
Kingstar brewery (no. 12 in the world), Zhujiang brewery (no. 15 in the
world), Kingway brewery, Yinmai brewery, etc. The beer volume produced
by these breweries is more than one-third of the total Chinese beer
production each year. Besides domestic enterprises, Deliang is also
responsible for cooperation with international partners, such as DSM
food limited, ICT-Czech Republic, VLB-Berlin, etc. Deliang has also
published many articles at home and abroad, and some articles have been
published in the Journal of the American Society of Brewing Chemists. Deliang is a member of both ASBC and MBAA.
VIEW PRESENTATION 177