Artículo
Influence of different storage conditions on the performance of spray-dried yogurt used as inoculum for milk fermentation
Bater, Caterina; Santos, Mauricio Ismael
; Galmarini, Mara Virginia
; Gomez Zavaglia, Andrea
; Chirife, Jorge
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Fecha de publicación:
08/2019
Editorial:
Cambridge University Press
Revista:
Journal of Dairy Research
ISSN:
0022-0299
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
A commercial drinkable yogurt with and without 4% of added trehalose (as cell protectant) was spray-dried obtaining a powder with low water activity (aw). Total bacterial count in the powder was between 8.48–8.90 log cfu/g. The dried yogurt was stored: (i) at 38 °C and aw = 0.33; (ii) at 38 °C in hermetically sealed flasks (aw = 0.21/0.22); (iii) in a cyclic temperature chamber (10–20 °C) in hermetically sealed flasks (aw = 0.21/0.22). Whole milk was then fermented by adding an inoculum of spray-dried yogurt after storage under these different conditions. The kinetics of acidification showed the presence of a lag time which was strongly dependent on storage conditions. The data was fitted with a logistic type equation from which the lag time was calculated. To evaluate structural differences among samples, Fourier Transform Infrared spectra (FTIR) were recorded. Partial Least Squares (PLS) models enabled a good correlation between lag time of fermentation and FTIR spectra. The lag time for yogurt powder stored at aw about 0.21/0.22 and cyclic temperature 10–20 °C remained approximately constant over the 12 weeks of storage, while all the other conditions resulted in a dramatic increase. The addition of trehalose had a small influence on lag time and, therefore, as a protectant of lactobacilli.
Palabras clave:
Acidification
,
FTIR
,
Lag time
,
Spray-drying
,
Yogurt
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Articulos(CIDCA)
Articulos de CENTRO DE INV EN CRIOTECNOLOGIA DE ALIMENTOS (I)
Articulos de CENTRO DE INV EN CRIOTECNOLOGIA DE ALIMENTOS (I)
Citación
Bater, Caterina; Santos, Mauricio Ismael; Galmarini, Mara Virginia; Gomez Zavaglia, Andrea; Chirife, Jorge; Influence of different storage conditions on the performance of spray-dried yogurt used as inoculum for milk fermentation; Cambridge University Press; Journal of Dairy Research; 86; 3; 8-2019; 354-360
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