Abstract
Streptococcus thermophilus and S. macedonicus are the only two species of the genus related to food productions so far known. In the present study, eight S. thermophilus and seven S. macedonicus strains isolated from dairy environments in Italy were compared in order to evidence possible species-specific technological characteristics. Their capability to use lactose, galactose, fructose, and glucose, sugars commonly present in foods and two carbohydrates considered as prebiotics, xylose and inulin, along with the respective growth kinetics were studied. Results showed a luxuriant growth on lactose and different behaviors on galactose, glucose, and fructose. No growth on inulin and xylose was recorded, which is a positive feature for strains intended to be used as starter cultures. Growth parameters, namely, λ, µmax, and Nmax, were estimated by using the Gompertz model. Antibiotic resistance to 14 drugs revealed an overall similar behavior between the two species with only a marked difference regarding gentamycin. Antimicrobial activity was also tested against six deleterious bacterial strains, but none of the strains evidenced inhibitory capabilities. The results presented here could be helpful to compare technological potentialities of the two species and to choose strains of the most suitable species for selected microbiological food transformations.
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Acknowledgements
The authors wish to thank Sudeb Saha for helpful discussion and Veneto Agricoltura for providing some of the strains. This study was financially supported by MIUR (Ministero dell’Istruzione, dell’Università e della Ricerca), DOR Project Numbers 60A08-5771/11 and 60A08-0032/11.
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Tarrah, A., Treu, L., Giaretta, S. et al. Differences in Carbohydrates Utilization and Antibiotic Resistance Between Streptococcus macedonicus and Streptococcus thermophilus Strains Isolated from Dairy Products in Italy. Curr Microbiol 75, 1334–1344 (2018). https://doi.org/10.1007/s00284-018-1528-7
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DOI: https://doi.org/10.1007/s00284-018-1528-7