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Marta Mikš-Krajnik,윤용진,육현균 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.1
Volatile organic compounds (VOCs) of naturally aerobically spoiled chicken breast at ambient temperature were analyzed to identify volatiles that can be used as spoilage markers. The headspace solid-phase micro-extraction (HS-SPME) technique coupled with gas GC/MS running in Fast Automated Scan/SIM Type (FASST) mode was applied using 4 SPME fibers of different polarity. All of fibers were able to detect the sulfides methanethiol (MeSH), dimethyl disulfide (DMDS), and dimethyl trisulfide (DMTS), the alcohols ethanol (EtOH), 1- and 2-butanol, and 1- butanol isomers, and free fatty acids (FFAs) in the range of C2 to C5. Principal component analysis (PCA) revealed that spoilage in chicken meat is 2-step process. Initially, an increase in amounts of alcohols and FFAs was observed (primary spoilage), followed by an increase in the sulfide content (secondary spoilage). The most promising volatile spoilage markers for chicken breast were EtOH and 3- methyl-1-butanol, followed by acetic acid (C2) and sulfides.
Łucja Łaniewska-Trokenheim,Magdalena Olszewska,Marta Mikš-Krajnik,Anna Zadernowska 한국미생물학회 2010 The journal of microbiology Vol.48 No.4
The focus of this study was to monitor the survival of populations and the volatile compound profiles of selected Lactobacillus strains during long-term incubation in milk. The enumeration of cells was determined by both the Direct Epifluorescent Filter Technique using carboxyfluorescein diacetate (CFDA) staining and the plate method. Volatile compounds were analysed by the gas-chromatography technique. All strains exhibited good survival in cultured milks, but Lactobacillus crispatus L800 was the only strain with comparable growth and viability in milk, assessed by plate and epifluorescence methods. The significant differences in cell numbers between plate and microscopic counts were obtained for L. acidophilus strains. The investigated strains exhibited different metabolic profiles. Depending on the strain used, 3 to 8 compounds were produced. The strains produced significantly higher concentrations of acetic acid, compared to other volatiles. Lactobacillus strains differed from one another in number and contents of the volatile compounds.