The study was conducted to examine the effect of penicillin (0.003 IJ ml -1 of milk) in concentration below the sensitivity level of biological methods (Delvo SP and Resasurine test) on yoghurt cultures. According to the results obtained, the stated penicillin concentration prolonged the period of final incubation in the bulk starter (3 h and 20 min) and in yoghurt (3 h and 40 min). The total count of S. thermophilus colonies in the bulk starter and yoghurt is also reduced with a loss of one (log 7.32), that is, two logarithmic numbers (log 6.53) compared with the control samples (without penicillin). The total count of L. bulgaricus colonies was higher in the control samples compared with the experimental samples. Upon the final incubation period and storage for 18 h at 5 °C, there was a drop in the titratable acidity and an increase in pH values of the control samples. Microscopic examination of the control samples showed a gradual disappearance of streptococci with a complete prevalence of lactobacilli in yoghurt. Additionally, morphological changes occurred in streptococci (long chains) and lactobacilli (long and irregular rods).
Rogelj, I. & Miklič-Anderlič, A. (2000): Comparison of sensitivity of Delvotest SP and Valiot 101 test on antibiotics, used in mastitis treatment. Yug milk Congress. Contemporary trends in milk production. Anthology of works, pp. 78-84.
Yug milk Congress. Contemporary trends in milk production. Anthology of works, () 78-84.
Yug milk Congress. Contemporary trends in milk production. Anthology of works7884)| false
Salle, A. (1972): Fundamental principles of bacteriology. Me Graw-Hill Book Co., New York, pp. 512-513.
Schiffmann, A. P., Schutz, M. & Wiesner, H. U. (1992): False negative and positive results in milk. 1. The influence of antibiotics residues in bulk milk on lactic production of starters. Milchwissenschaft, 47, 712-714.
'False negative and positive results in milk. 1. The influence of antibiotics residues in bulk milk on lactic production of starters.' () 47Milchwissenschaft: 712-714.
False negative and positive results in milk. 1. The influence of antibiotics residues in bulk milk on lactic production of starters.Milchwissenschaft47712714)| false
Vuković, V. (1991): Residue resorption and secretion of penicillin, streptomycin and oxytetracycline in milk after intrauterine administration. Doctoral thesis, Faculty of Veterinary Medecine, Belgrade.
Mijačević, Z. (1992): Milk technology. Fermented milk and cheese. Union of Veterinary Surgeons and Technicians in Yugoslavia, Belgrade, pp. 52-53.
Ph. Jug. IV (1984): Pharmacopoeia Jugoslavica. Published by Federal Institute of Public Health, Belgrade, No 1, p. 177.
Robinson, R. K. (1983): Dairy microbiology. The microbiology of milk products. Applied Science Publ., London, New York, Vol. 2, p. 139.
Dairy microbiology. The microbiology of milk products, () 139.
Dairy microbiology. The microbiology of milk products2139)| false
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2021 Volume 50
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