Fig 4. Graph of emulsion stability of durian seed gum
Based on the above data, it can be estimated isoelectric point of durian seed gum is in the
range of pH 4.5. [4] and [15] stated that the activity of the protein solution emulsion will generally
be at the minimum point at pH isoelectric. The ability of the emulsion activity decreases with
increasing pH, so at pH 3 emulsions activity is at its highest point.
Emulsion stability at pH 3 to 4.5 is relatively unstable, moreover this is zero because there is
no emulsion is formed, but rather a process that occurs is creaming, whereas at pH 6-9 is relatively
high emulsion stability and reaches a maximum at pH 7 , 5-9. No effect of pH on emulsion stability
durian seed gum. Based on these patterns, the durian seed gum is thought to have an isoelectric
point in the range of pH 4.5 as at pH activity and stability of the emulsion is the lowest. [15]
revealed that the isoelectric point, electrostatic repulsion refuse will reach a minimum value, so that