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1 Department of Microbiology, University College Cork, Republic of Ireland
2 Dairy Products Centre, Teagasc, Moorepark, Fermoy, County Cork, Republic of Ireland
3 Statistics Department, Teagasc, 19 Sandymount Avenue, Dublin 4, Republic of Ireland
The study evaluated the effects of elevated ripening temperature (7 or 12°C) and starter type on the quality of experimentally produced, reduced fat Cheddar cheeses with a moisture content in the nonfat substances of
55% (wt/wt). In one treatment, the population of nonstarter lactic acid bacteria in the cheese was markedly reduced at both ripening temperatures through the use of a single-strain culture that both produced and was immune to the broadspectrum bacteriocin lacticin 3147. Elevation of the ripening temperature resulted in significantly higher primary and secondary proteolysis and higher flavor and aroma scores at ripening times
150 d. The culture type affected the levels of secondary proteolysis but generally had no significant effect on flavor or texture scores. Cheeses ripened at 12°C were significantly softer than those ripened at 7°C from 60 d onward. Mean texture scores were not significantly influenced by ripening temperature; however, at >150 d, texture scores tended to decrease in cheeses ripened at 12°C to an extent depending on the type of starter culture used. Differences in the rate of growth and the final population of nonstarter lactic acid bacteria (from 103 to 107) in the cheeses had no significant effect on proteolysis or flavor and aroma or body and texture.
Key Words: elevated temperature ripening reduced fat Cheddar cheese lacticin 3147
Submitted on March 11, 1998
Accepted on September 3, 1998
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