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Title: | Influence of different storage conditions on the performance of spray-dried yogurt used as inoculum for milk fermentation | Authors: | Bater, Caterina Santos, Mauricio Galmarini, Mara V Gómez-Zavaglia, Andrea Chirife, Jorge |
Keywords: | Acidificación;Espectroscopía Infrarroja por Transformada de Fourier;Síndrome Jet Lag;Yogur | Issue Date: | Aug-2019 | Journal: | Journal of dairy research | Abstract: | 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. |
Description: | Fil: Bater, Caterina. Pontificia Universidad Católica Argentina. Facultad de Ingeniería y Ciencias Agrarias, Ciudad Autónoma de Buenos Aires; Argentina. Fil: Santos, Mauricio. ANLIS Dr.C.G.Malbrán. Instituto Nacional de Enfermedades Infecciosas. Fil: Galmarini, Mara V. Pontificia Universidad Católica Argentina. Facultad de Ingeniería y Ciencias Agrarias, Ciudad Autónoma de Buenos Aires; Argentina. Fil: Gómez-Zavaglia, Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas de Argentina, Ciudad Autónoma de Buenos Aires; Argentina. Fil: Chirife, Jorge. Pontificia Universidad Católica Argentina. Facultad de Ingeniería y Ciencias Agrarias, Ciudad Autónoma de Buenos Aires; Argentina. |
URI: | http://sgc.anlis.gob.ar/handle/123456789/2295 | ISSN: | 1469-7629 | DOI: | 10.1017/S0022029919000463 |
Appears in Collections: | Publicaciones INEI |
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