Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/6605
Título: Effects of ripening time and combination of ovine and caprine milks on proteolysis of Picante cheese
Autor: Freitas, A. Cristina
Fresno, J. Maria
Prieto, Bernardo
Malcata, F. Xavier
Carballo, Javier
Data: 1997
Editora: Elsevier
Citação: FREITAS, A. Cristina... [et al.] - Effects of ripening time and combination of ovine and caprine milks on proteolysis of Picante cheese.Food Chemistry. ISSN 0308-8146. 60:2 (1997) 219-229
Resumo: Proteolysis in Picante cheese was characterized by assaying for breakdown products throughout a 180 day ripening period using different combinations of ewe's and goat's milks. Parameters analysed were total nitrogen (TN), water-soluble nitrogen (WSN) and non-protein nitrogen (NPN) using Kjeldahl and spectro-photometric methods, and casein profile by electrophoresis. WSN at 180 days of ripening was 25–29% TN. The maximum NPN values were attained by 180 days of ripening and corresponded to 87% and 92% of the WSN in 0C and 100C, respectively (where iC denotes a cheese manufactured with i% caprine milk). Statistically significant correlations were obtained between the various analytical methods of assay for nitrogen and ripening time. The spectrophotometric methods using either trinitrobenzenesulphonic acid or cadmium-ninhydrin proved satisfactory in assessing the ripening index (instead of the Kjeldahl method). Degradation of β-caseins at 180 days was 18.8, 26.4, 40.2, 55.6 and 36.5% for 0C, 25C, 50C, 75C and 100C, respectively. Degradation of αs-caseins by 180 days was 35.9, 40.2, 81.8, 93.0 and 68.7% for 0C, 25C, 50C, 75C and 100C, respectively. In general, a higher cheesemaking milk fraction of caprine milk was associated with higher amounts of γ-caseins.
Peer review: yes
URI: http://hdl.handle.net/10400.14/6605
Versão do Editor: doi:10.1016/S0308-8146(96)00323-8
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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