as sucrose, แรฟฟิโนส and stachyose are the main carbon source in soy milk, the extension of fermentation of this food matrix relies on the ability of the bacteria to ferment these sugars ( Hati et al., 2013 and Wang et al., 2003). The averages of kinetic parameters, especially Vmax and Tvmax, of the fermentation of soy milk by B. แล็กทิส and L. เฟอเม็นตุม are in accordance to the observations of Garro, Valdez, and Giori (2004), which carried out the soy milk fermentation at 42 °C.