Analysis of Alicyclobacillus acidoterrestris spores from different sporulation media subjected to wet-heat

The presence of Alicyclobacillus acidoterrestris endospores in fruit juices is a significant problem for the juice industry since they are able to survive pasteurization subsequently leading to the spoilage. To evaluate the mechanism of wet-heat, structural damage and the leakages of intracellular materials of A. acidoterrestris DSM 3922 spores from different sporulation media was studied at 90°C (15-45 min). For sporulation, Bacillus acidoterrestris agar, Bacillus acidocaldarius agar, potato dextrose agar and malt extract agar were used. Based on the scanning electron microscopy, loss of internal volume and structural integrity were observed following heating which were further confirmed by the leakages of intracellular components. The obtained results suggest that the inactivation of A. acidoterrestris DSM 3922 spores by wet-heat is associated with damage to the coat and inner membrane depending on the sporulation medium composition and heating time

Prevalence and diversity of Arcobacter spp. in retail chicken meat in Turkey

WOS: 000413202200006Arcobacters are food and waterborne pathogens associated with human and animal infections. The objective of the present study was to investigate the prevalence and diversity of Arcobacter spp. in commercially sold chicken meat in Izmir region of Turkey. For this purpose, 100 samples including legs (n= 40), 17 chicken quarters (n= 17), drumstickers (n= 16), breasts (n= 11), wings (n= 10), and carcasses (n= 6) were collected from different retail markets. A total of 65 isolates were confirmed as Arcobacter spp. from 55 samples by genus-specific polymerase chain reaction (PCR). The prevalence of Arcobacter spp. was 32.5, 81.3, 64.7, 72.7, 83.3, and 50% for legs, drumstickers, chicken quarters, breasts, carcasses and wings, respectively. Based on the multiplex-PCR, most of the isolates were identified as A. butzleri (n= 45, 80%), followed by A. cryaerophilus (n= 2, 3.6%), A. skirrowii (n= 1, 1.8%) and 17 isolates (30.9%) could not be identified at the species level

Prevalence and Diversity of Arcobacter spp. in Retail Chicken Meat in Turkey

Arcobacters are food and waterborne pathogens associated with human and animal infections. The objective of the present study was to investigate the prevalence and diversity of Arcobacter spp. in commercially sold chicken meat in İzmir region of Turkey. For this purpose, 100 samples including legs (n = 40), 17 chicken quarters (n = 17), drumstickers (n = 16), breasts (n = 11), wings (n = 10), and carcasses (n = 6) were collected from different retail markets. A total of 65 isolates were confirmed as Arcobacter spp. from 55 samples by genus-specific polymerase chain reaction (PCR). The prevalence of Arcobacter spp. was 32.5, 81.3, 64.7, 72.7, 83.3, and 50% for legs, drumstickers, chicken quarters, breasts, carcasses and wings, respectively. Based on the multiplex-PCR, most of the isolates were identified as A. butzleri (n = 45, 80%), followed by A. cryaerophilus (n = 2, 3.6%), A. skirrowii (n = 1, 1.8%) and 17 isolates (30.9%) could not be identified at the species level

Modeling growth of Alicyclobacillus acidoterrestris DSM 3922 type strain vegetative cells in the apple juice with nisin and lysozyme

Baysal, Ayse/0000-0002-1487-7407WOS: 000406746400008PubMed: 31294163In the present study, the effect of storage temperature on A. acidoterrestris DSM 3922 cells (105 CFU/mL) was examined during growth in reconstituted apple juice (pH 3.8, degrees Brix 11.3) containing nisin (0-100 IU/mL) and lysozyme (0-100 mg/L). The growth curves were obtained at three temperatures of 27, 35 and 43 degrees C using absorbance data (OD600nm). Based on the results, the minimal inhibitory concentrations (MICs) of nisin were found as 10 IU/mL at all tested temperatures. On the other hand, increasing the temperature decreased the amount of lysozyme for growth inhibition. The MICs of lysozyme were found as 10, 2.5 and 1.25 mg/L at 27, 35 and 43 degrees C, respectively. At selected non-inhibitory doses, nisin (1.25-5 IU/mL) and lysozyme (0.3-2.5 mg/L) prolonged the lag time compared to the controls at the corresponding temperatures. In addition, there was a strong linear relationship between the lag time and lysozyme concentrations at 27 and 35 degrees C (R-2 > 0.98). The results of this study demonstrated that both nisin and lysozyme could be used to inhibit the growth of A. acidoterrestris cells in the apple juice. The results also indicated that the growth parameters were variable depending on the storage temperature and the type of the antimicrobial agent used in the apple juice