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1 Departamento de Producción y Tecnología de Alimentos, Centro de lnvestigadon y Tecnología, Instituto Nacional de lnvestigaciones Agrarias, Apartado 8111, 28080 Madrid, Spain
The effect of two commercial preparations of neutral proteinase from Bacillus subtilis (Neutrase L and Novozym 257) on chemical, rheological, and sensory characteristics of Manchego cheese made from pasteurized ewes' milk and ripened for 90 d at 12 or 16°C was investigated. Levels of proteinase added to milk were in the range .001 to .004 Anson units/L of milk. Degradation of 
s1-casein was not influenced by proteinase level; however, residual ß-casein was lower in cheese made with .004 Anson units of proteinase/L. Formation of pH 4.6-soluble N in cheese was more influenced by Neutrase L or Novozym proteinase addition than formation of TCA-soluble N or phosphotungstic acid-soluble N. Cheese made with Neutrase L proteinase was more crumbly and less elastic than control cheese, showing lower fracturability and hardness values. Frequency of bitter flavor was not significantly higher for cheese made with Neutrase L or Novozym proteinase than for control cheese. Flavor preference was not influenced by Neutrase L proteinase, but it was slightly impaired by Novozym proteinase. Flavor intensity was more enhanced by Neutrase L proteinase than by Novozym proteinase. Addition of .004 Anson units/L of Neutrase L proteinase would reduce ripening time by 15 d, an increase of 4°C in ripening temperature by 40 d, according io regression equations calculated from experimental data. Therefore, Manchego cheese made from milk to which .004 Anson units/L of Neutrase L proteinase was added would develop in 35 d at 16°C the same flavor intensity as control Manchego cheese held for 90 d at 12°C.
Key Words: ripening acceleration • Manchego cheese • ewes' milk
Submitted on July 26, 1990
Accepted on March 18, 1991
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