Document Detail

Factors affecting growth and pigmentation of Penicillium caseifulvum.
MedLine Citation:
PMID:  12487445     Owner:  NLM     Status:  MEDLINE    
Color formation, metabolite production and growth of Penicillium caseifulvum were studied in order to elucidate factors contributing to yellow discoloration of Blue Cheese caused by the mold. A screening experiment was set up to study the effect of pH, concentration of salt (NaCl), P, K, N, S, Mg and the trace metals Fe, Cu, Zn, Mn on yellow color formation, metabolite production and mold growth. Multivariate statistical analysis showed that the most important factor affecting yellow color formation was pH. The most pronounced formation of yellow color, supported by highest amount of colored metabolites, appeared at low pH (pH 4). Mold growth was not correlated to the yellow color formation. Salt concentration was the most important factor affecting mold growth and length of lag phase. Production of secondary metabolites was strongly influenced by both pH and salt concentration. The screening results were used to divide the metabolites into the following three groups: 1) correlated to growth, 2) correlated to color formation, and 3) formed at high pH. Subsequently, a full factorial experiment with factors P, Mg and Cu, showed that low P concentrations (2,000 mg/kg) induced yellow color formation. Among the factors contributing to yellow color formation, pH and salt concentration are easy to control for the cheesemaker, while the third factor, P-concentration, is not. Naturally occurring variations in the P-concentration in milk delivered to Blue Cheese plants, could be responsible for the yellow discoloration phenomenon observed in the dairy industry.
K I Suhr; I Haasum; L D Steenstrup; T O Larsen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  85     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-12-18     Completed Date:  2003-04-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2786-94     Citation Subset:  IM    
Mycology Group, Biocoentrum-DTU, Soltofts Plads, Building 221, Technical University of Denmark, DK-2800 Lyngby, Denmark.
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MeSH Terms
Cheese / microbiology,  standards*
Food Microbiology
Hydrogen-Ion Concentration
Minerals / pharmacology
Penicillium / drug effects,  growth & development*,  metabolism
Phosphorus / pharmacology*
Pigmentation / drug effects*
Sodium Chloride / pharmacology*
Reg. No./Substance:
0/Minerals; 7647-14-5/Sodium Chloride; 7723-14-0/Phosphorus

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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