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Convective drying of baker’s yeast pellets containing a carrier

par Van Engeland, Charlotte ;Spreutels, L.;Legros, Robert;Haut, Benoît
Référence Drying technology, 37, 11, page (1405-1417)
Publication Publié, 2019-08-01

Article révisé par les pairs

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Résumé :

The drying behavior of yeast pellets containing a carrier was investigated. Yeast paste was mixed with different amounts of wheat flour, a solid carrier, to obtain spherical pellets with 69, 55, and 40 wt% of water. During the drying, the pellets moisture content, surface temperature, and dimensions were measured, using a balance, an infrared camera, and a stereomicroscope, respectively. A drying kinetics model was developed and successfully challenged to the experimental results. The experimental and modeling results give insights into the phenomena taking place during the drying of yeast pellets including a carrier. These results highlight that the addition of a carrier reduces the shrinkage of the pellets and increases the drying rate. Moreover, the results seem to indicate that an osmosis process may take place inside the pellets following the addition of the carrier.