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Effects of pH and Cultivation Time on the Formation of Styrene and Volatile Compounds by Penicillium expansum

Title
Effects of pH and Cultivation Time on the Formation of Styrene and Volatile Compounds by Penicillium expansum
Authors
Kim, Hye WonLee, Sang MiSeo, Jeong-AhKim, Young-Suk
Ewha Authors
김영석이상미
SCOPUS Author ID
김영석scopus; 이상미scopus
Issue Date
2019
Journal Title
MOLECULES
ISSN
1420-3049JCR Link
Citation
MOLECULES vol. 24, no. 7
Keywords
styrenephenylalanine metabolismPenicillium expansumvolatile compoundspHcultivation time
Publisher
MDPI
Indexed
SCIE; SCOPUS WOS
Document Type
Article
Abstract
Styrene can be formed by the microbial metabolism of bacteria and fungi. In our previous study, styrene was determined as a spoilage marker of Fuji apples decayed by Penicillium expansum, which is responsible for postharvest diseases. In the present study, P. expansum was cultivated in potato dextrose broth added with phenylalanine-which is a precursor of styrene-using different initial pH values and cultivation times. Volatile compounds were extracted and analyzed using gas chromatography-mass spectrometry (GC-MS) combined with stir-bar sorptive extraction. The 76 detected volatile compounds included 3-methylbutan-1-ol, 3-methyl butanal, oct-1-en-3-ol, geosmin, nonanal, hexanal, and gamma-decalactone. In particular, the formation of 10 volatile compounds derived from phenylalanine (including styrene and 2-phenylethanol) showed different patterns according to pH and the cultivation time. Partial least square-discriminant analysis (PLS-DA) plots indicated that the volatile compounds were affected more by pH than by the cultivation time. These results indicated that an acidic pH enhances the formation of styrene and that pH could be a critical factor in the production of styrene by P. expansum. This is the first study to analyze volatile compounds produced by P. expansum according to pH and cultivation time and to determine their effects on the formation of styrene.
DOI
10.3390/molecules24071333
Appears in Collections:
엘텍공과대학 > 식품공학전공 > Journal papers
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