1992; Keogh and o'Kennedy, 1998. According to amatayakul et al., (2006), the denatured whey protein on the surface micell increased with a reduction in the sodium caseinate to WPI ratio. This would prevent the coalescence of casein micelles and network formation, and result in decreased hardnesrt of the yogute. the same trend was show for the adhesiveness study. the springiness was not significantly affected by the additions of sodium caseinate or WPI.