in Table 1. Before inoculation, the probiotic bacteria were replicated
twice for 16 h at 37 °C under an atmosphere of (85%
nitrogen, 10%oxygen, and 5% carbon dioxide in de Man Rogosa
Sharp (MRS) broth (Difco, Sparks, MD, USA) supplemented
with cysteine, 0.5 g/l. Cultures were centrifuged to pellet the cells
which were then resuspended in cows' milk or soy beverage.
Probiotic bacteria were added at numbers of 1×105 cfu/500 ml of
milk or soy beverage at the same time that the yogurt starter
bacteria were added. Each fermentation was repeated three times.