Growth of Lactococcus lactis subsp lactis in reconstituted irradiated milk powder
| Autor: | C. Favrot, J.L. Maubois |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
chemistry.chemical_classification
education.field_of_study biology Population Lactococcus lactis food and beverages Irradiated milk biology.organism_classification Streptococcaceae Amino acid Superoxide dismutase Lactococcus lactis subsp. lactis chemistry Biochemistry biology.protein Food science education Bacteria Food Science |
| Zdroj: | Le Lait. 74:253-266 |
| ISSN: | 0023-7302 |
| DOI: | 10.1051/lait:1994421 |
| Popis: | Summary - Low heat milk powder was submitted to y-ray irradiation in order to sterilize it and then tested for grawth of L lactis subsp lactis strains CNRZ 1076 (prtt) and its non-proteolytic-variant, CNRZ 1075 (prt-). Inhibition was observed when reconstituted milk was inoculated at a level of 104 but not 106 cfu/ml. This inhibition was partly relieved by addition of superoxide dismutase (SOD) suggesting a correlation with the production of 02-' The maximum stationary phase populations of CNRZ 1076 (prtt) in reconstituted milk from irradiated powder and in reference milk were identical while the maximum stationary phase population of CNRZ 1075 (prt-) was significantly higher in reconstituted milk made from irradiated powder. Amino acids analysis of the non-protein fraction revealed that irradiation led to a release of peptides, which Iikely enhanced final yields of prt-. Consequently, irradiated milk acidification by L lactis CNRZ 1076 (prt-) was delayed, while that of CNRZ 1075 (prt-) was greatly stimulated. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|