Changes in the soluble nitrogen fraction of milk throughout PDO Grana Padano cheese-making
| Autor: | Luisa Pellegrino, John Hogenboom, Paolo D'Incecco, Veronica Rosi, Angelo Stroppa |
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| Rok vydání: | 2015 |
| Předmět: |
Whey protein
animal structures food.ingredient biology Chemistry digestive oral and skin physiology food and beverages Raw milk Applied Microbiology and Biotechnology Lactic acid Creaming chemistry.chemical_compound fluids and secretions food Skimmed milk biology.protein Alpha-lactalbumin Fermentation Food science Beta-lactoglobulin Food Science |
| Zdroj: | International Dairy Journal. 47:128-135 |
| ISSN: | 0958-6946 |
| DOI: | 10.1016/j.idairyj.2015.03.002 |
| Popis: | The behaviour of soluble nitrogen compounds during Grana Padano cheese-making was studied at eight dairies. Raw milk, skimmed milk, sweet whey and the derived natural whey culture, collected from 24 processes, were analysed for soluble whey proteins (α-lactalbumin and β-lactoglobulin), proteose-peptones (PP), small peptides (SP), caseinomacropeptides (CMPs), and free amino acids (FAAs). The PP fraction increased during milk natural creaming, then part of it was selectively retained in the curd and the rest degraded in the first few hours of whey fermentation, together with α-lactalbumin, CMPs and part of SP. Features outlined for the whey culture were confirmed on 30 samples collected at six different dairies. A time course study of the whey fermentation showed that degradation of α-lactalbumin began when the pH dropped below 4, whereas β-lactoglobulin content did not change. Uptake of specific FAAs was shown to support the initial growth of lactic acid bacteria in whey. |
| Databáze: | OpenAIRE |
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