Document Detail

Correlation between multielement stable isotope ratio and geographical origin in Peretta cows' milk cheese.
MedLine Citation:
PMID:  16507675     Owner:  NLM     Status:  MEDLINE    
The aim of this study was to characterize the isotopic composition and protect "Peretta" cows' milk cheese, a typical product of Sardinia, against other cheeses of the same appearance sold under the same name, but made of raw materials from northern Europe. The study was concerned with 3 types of cheese: those produced in local dairies from milk from free-grazing or pasture-grazing cows in Sardinia (local dairy product), cheeses made on an industrial scale from milk produced by intensive farming in Sardinia (factory cheese), and cheeses made with raw materials imported from other countries (imported product). To distinguish the Sardinian cheeses from the imported product, the stable isotope ratios 13C/12C, 15N/14N, D/H, 34S/32S, and (18)O/(16)O were used. Determination of the isotopic data delta13C, delta15N, delta2H, and delta34S was performed in the casein fraction, whereas delta(18)O and delta13C were determined in the glycerol fraction. Measurements were performed by isotope ratio mass spectrometry. A comparison between mean values of the isotope ratios by statistical analysis (ANOVA and Tukey's test) showed that the greatest difference between the 3 types of cheese (local dairy, factory, and imported products) was in the 13C/12C, 34S/32S, and (18)O/(16)O isotope ratios. In the other parameters, either no differences (delta15N) or minimal differences (delta2H) were found. Evaluation of the data by multivariate statistical analysis (principal component analysis and hierarchical cluster analysis) revealed that the isotope characteristics of the factory products were similar to those of the cheeses produced from imported raw materials, whereas a difference was found between the local dairy-produced cheeses and the products in the other 2 categories.
G Manca; M A Franco; G Versini; F Camin; A Rossmann; A Tola
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  89     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-03-01     Completed Date:  2006-06-12     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:  831-9     Citation Subset:  IM    
Dipartimento di Chimica, Università di Sassari, 07100 Sassari, Italy.
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MeSH Terms
Analysis of Variance
Carbon Isotopes / analysis
Caseins / analysis
Cheese / analysis*,  classification*
Deuterium / analysis
Glycerol / analysis
Isotopes / analysis*
Mass Spectrometry
Milk / chemistry*
Nitrogen Isotopes / analysis
Oxygen Isotopes / analysis
Sulfur Isotopes / analysis
Reg. No./Substance:
0/Carbon Isotopes; 0/Caseins; 0/Isotopes; 0/Nitrogen Isotopes; 0/Oxygen Isotopes; 0/Sulfur Isotopes; 56-81-5/Glycerol; 7782-39-0/Deuterium

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