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Study on the sugar content of blue-veined “Gorgonzola” PDO cheese

Author:
Monti, Lucia, Pelizzola, Valeria, Povolo, Milena, Fontana, Stefano, Contarini, Giovanna
Source:
International dairy journal 2019 v.95 pp. 1-5
ISSN:
0958-6946
Subject:
cheese ripening, cheeses, chromatography, galactose, glucose, lactose, lactose free diet, metabolism, microorganisms, sugar alcohols, sugar content
Abstract:
A chromatographic method, HPAEC-PAD, was applied to 49 samples of Gorgonzola PDO cheese to quantify residual sugars. Very low levels were detected in both sweet and piquant categories: values were, respectively, 1.24 ± 1.30 and 0.69 ± 0.11 mg 100 g−1 for lactose, 1.21 ± 0.60 and 2.07 ± 1.77 mg 100 g−1 for galactose and 5.41 ± 4.58 and 4.46 ± 4.09 mg 100 g−1 for glucose. Analysis of cores, taken from the same cheese at different days of ripening, showed that sugars had already been completely metabolised 10 days after production. These results allow the use of term “naturally lactose free” for Gorgonzola PDO cheese. The chromatographic profile showed the presence of other peaks, which were tentatively identified as polyols (sugar alcohols), probably derived by metabolism and catabolism of microflora.
Agid:
6359340