Behaviour of Streptococcus lactis in heat treated (80 ºC for 30 min) or sterilized cow's and ewe's milk
Generation times and acid production after 6 and 24 h by 20 strains of Streptococcus lactis of dairy origin were determined in heat treated (80 C for 30 min) and sterilized cow's and ewe's milk. Ewe's milk enhanced growth of the streptococci, with significantly (P &A;0.001) shorter generation times and higher acid production after 6 h incubation than cow's milk, probably due to its higher vitamin content. The stronger buffer capacity of ewe's milk allowed a higher (P &A;0.001) acid production after 24 h than cow's milk. A stimulatory effect of sterilization on generation time and acid production after 24 h was observed in cow's milk. However, the heat treated ewe's milk was shown to be a better substrate than sterilized ewe's milk for Str. lactis. We thank C. Garc ía-Aser and M. A. Rodríguez-Marín for N determinations and C. Burbano for Ca and Mg analysis. © 1983, Proprietors of Journal of Dairy Research. All rights reserved.
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1983
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dig-inia-es-20.500.12792-58572020-12-15T09:47:49Z Behaviour of Streptococcus lactis in heat treated (80 ºC for 30 min) or sterilized cow's and ewe's milk Chavarri, F. J. Nuñez, J. A. Nuñez, M. Generation times and acid production after 6 and 24 h by 20 strains of Streptococcus lactis of dairy origin were determined in heat treated (80 C for 30 min) and sterilized cow's and ewe's milk. Ewe's milk enhanced growth of the streptococci, with significantly (P &A;0.001) shorter generation times and higher acid production after 6 h incubation than cow's milk, probably due to its higher vitamin content. The stronger buffer capacity of ewe's milk allowed a higher (P &A;0.001) acid production after 24 h than cow's milk. A stimulatory effect of sterilization on generation time and acid production after 24 h was observed in cow's milk. However, the heat treated ewe's milk was shown to be a better substrate than sterilized ewe's milk for Str. lactis. We thank C. Garc ía-Aser and M. A. Rodríguez-Marín for N determinations and C. Burbano for Ca and Mg analysis. © 1983, Proprietors of Journal of Dairy Research. All rights reserved. 2020-10-22T21:30:16Z 2020-10-22T21:30:16Z 1983 journal article http://hdl.handle.net/20.500.12792/5857 10.1017/S0022029900023190 eng Attribution-NonCommercial-ShareAlike 4.0 International http://creativecommons.org/licenses/by-nc-sa/4.0/ open access |
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Generation times and acid production after 6 and 24 h by 20 strains of Streptococcus lactis of dairy origin were determined in heat treated (80 C for 30 min) and sterilized cow's and ewe's milk. Ewe's milk enhanced growth of the streptococci, with significantly (P &A;0.001) shorter generation times and higher acid production after 6 h incubation than cow's milk, probably due to its higher vitamin content. The stronger buffer capacity of ewe's milk allowed a higher (P &A;0.001) acid production after 24 h than cow's milk. A stimulatory effect of sterilization on generation time and acid production after 24 h was observed in cow's milk. However, the heat treated ewe's milk was shown to be a better substrate than sterilized ewe's milk for Str. lactis. We thank C. Garc ía-Aser and M. A. Rodríguez-Marín for N determinations and C. Burbano for Ca and Mg analysis. © 1983, Proprietors of Journal of Dairy Research. All rights reserved. |
| format |
journal article |
| author |
Chavarri, F. J. Nuñez, J. A. Nuñez, M. |
| spellingShingle |
Chavarri, F. J. Nuñez, J. A. Nuñez, M. Behaviour of Streptococcus lactis in heat treated (80 ºC for 30 min) or sterilized cow's and ewe's milk |
| author_facet |
Chavarri, F. J. Nuñez, J. A. Nuñez, M. |
| author_sort |
Chavarri, F. J. |
| title |
Behaviour of Streptococcus lactis in heat treated (80 ºC for 30 min) or sterilized cow's and ewe's milk |
| title_short |
Behaviour of Streptococcus lactis in heat treated (80 ºC for 30 min) or sterilized cow's and ewe's milk |
| title_full |
Behaviour of Streptococcus lactis in heat treated (80 ºC for 30 min) or sterilized cow's and ewe's milk |
| title_fullStr |
Behaviour of Streptococcus lactis in heat treated (80 ºC for 30 min) or sterilized cow's and ewe's milk |
| title_full_unstemmed |
Behaviour of Streptococcus lactis in heat treated (80 ºC for 30 min) or sterilized cow's and ewe's milk |
| title_sort |
behaviour of streptococcus lactis in heat treated (80 ºc for 30 min) or sterilized cow's and ewe's milk |
| publishDate |
1983 |
| url |
http://hdl.handle.net/20.500.12792/5857 |
| work_keys_str_mv |
AT chavarrifj behaviourofstreptococcuslactisinheattreated80ocfor30minorsterilizedcowsandewesmilk AT nunezja behaviourofstreptococcuslactisinheattreated80ocfor30minorsterilizedcowsandewesmilk AT nunezm behaviourofstreptococcuslactisinheattreated80ocfor30minorsterilizedcowsandewesmilk |
| _version_ |
1758004741098438656 |