| Title: | Effects of pH and Cultivation Time on the Formation of Styrene and Volatile Compounds by Penicillium expansum |
| Author(s): | Kim HW; Lee SM; Seo JA; Kim YS; |
| Address: | "Department of Food Science and Engineering, Ewha Womans University, Seoul 120-750, Korea. tttyio1234@naver.com. Department of Food Science and Engineering, Ewha Womans University, Seoul 120-750, Korea. smlee78@ewha.ac.kr. School of Systems Biomedical Science, Soongsil University 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Korea. sja815@ssu.ac.kr. Department of Food Science and Engineering, Ewha Womans University, Seoul 120-750, Korea. yskim10@ewha.ac.kr" |
| DOI: | 10.3390/molecules24071333 |
| ISSN/ISBN: | 1420-3049 (Electronic) 1420-3049 (Linking) |
| 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" |
| Keywords: | *Hydrogen-Ion Concentration Penicillium/*metabolism Phenylalanine/metabolism Styrene/chemistry/*metabolism Volatile Organic Compounds/chemistry/*metabolism Penicillium expansum cultivation time pH phenylalanine metabolism styrene volatile compounds; |
| Notes: | "MedlineKim, Hye Won Lee, Sang Mi Seo, Jeong-Ah Kim, Young-Suk eng Switzerland 2019/04/17 Molecules. 2019 Apr 4; 24(7):1333. doi: 10.3390/molecules24071333" |
