Sürdürülebilir Kalkınma Amaçları
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- MakaleAçık Erişim2019Scopus SJRQ3Genotypic identification of lactic acid bacteria in pastirma produced with different curing processes; [Farklı kürleme İşlemleri İle üretilen pastırmada laktik asit bakterilerinin genotipik İdentifikasyonu]
Çınar, Kübra; Fettahoğlu, Kübra; Kaban, Güzin
The lactic acid bacteria isolated from pastirma, produced under controlled conditions using two different curing temperatures (4°C or 10°C) and two different curing agents (150 mg/kg sodium nitrite or 300 mg/kg potassium nitrate), were subjected to genotypic (16S rRNA sequecing) identification. According to the identification results, 68 of 87 isolates (78.16%) was identified as Pediococcus pentosaceus. This species was followed by P. acidilactici (14.94%), Lactobacillus sakei (4.60%) and L. plantarum (2.30%), respectively. P. pentosaceus was dominant species in all curing applications (4°C/nitrate or nitrite or 10°C/nitrate or nitrite). Another species determined in all groups was P. acidilactici. While L. plantarum was only isolated from samples produced with nitrate (4°C or 10°C), L. sakei was isolated from samples produced with nitrite (4°C or 10°C). The effect of the curing agent on the biodiversity of lactic acid bacteria in pastirma was more effective than the curing temperature.
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İncele - MakaleAçık Erişim2019Scopus SJRQ3Biodiversity and characterization of gram-positive, catalase-positive cocci isolated from pastırma produced under different curing processes
Fettahoğlu, Kübra; Çinar, Kübra; Kaya, Mükerrem; Kaban, Güzin
The aim of this study was to determine the effects of different curing temperatures (4 °C or 10 °C) and agents (KNO3 or NaNO2) on microbiological and physicochemical properties of pastırma and diversity of gram-positive, catalase-positive cocci (GCC+) and also to investigate some technological properties of the strains. Four different groups of pastırma were produced applying different curing temperatures and agents. After production, GCC+ isolated from pastırma were subjected to phenotypic and genotypic (16S rRNA sequencing) identification. Genotypically characterized strains were evaluated for their technological properties. In all groups, aw and pH were observed to be under 0.90 and over 5.5, respectively. In genotypic identification, 45 isolates were identified as Staphylococcus vitulinus, while other isolates identified were S. equorum (n = 15), S. saprophyticus (n = 15), and S. xylosus (n = 12). All of the strains could grow at different salt concentrations (8% and 15%) and temperatures (4 °C, 10 °C, and 37 °C). Four strains of S. saprophyticus showed strong lipolytic activity while nine strains of S. vitulinus had strong proteolytic activity. This study showed that different curing temperatures and agents are particularly effective on the microflora in pastırma; however, these factors do not cause a high diversity in GCC+ in terms of species.
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