Fermented milk firmness was measured in quadruplicate on 50-
mL samples at 8 C using a TA-XT2 Texture Analyzer (Stable Micro
Systems Ltd., Godalming, UK). The operating conditions were: P/
25P acrylic type probe (diameter of 2.5 cm), 10 mm penetration,
and 10 mm/s speed. Firmness was determined as the maximum
penetration and expressed in N.