Abstract:

In order to explore the effect of spray drying temperature on the solubility of yak milk powder, solubility
characteristics of yak milk powder produced at different inlet/outlet temperatures (130/56, 150/64, 170/73, 190/81, and
210/90 ℃) were measured and analyzed through correlation and cluster analysis. The results demonstrated that spray drying
temperature had significant effect on solubility characteristics of yak milk powder (P < 0.05). Yak milk powder produced
at 170/73℃ had high hydration capacity, bulk density and solubility and small repose angle and dispersion time, showing
better solubility than those produced at other spray drying temperatures. The cluster analysis could be used to distinguish the
solubility of yak milk powder produced at different spray drying temperatures, thereby providing a theoretical reference to
distinguish the quality of yak milk powder produced by spray drying.

Key words: spray drying temperature, solubility, yak milk powder, cluster analysis