• mesquite gum;
  • microencapsulation;
  • minimum entropy;
  • water activity and;
  • glass transition

ABSTRACT: Mesquite gum solutions (30% w/v) were used to emulsify orange peel oil in an oil-gum solids ratio of 0.25. Emulsions were spray dried in laboratory scale equipment. The powders were stored in aw(s) from 0.108 to 0.743 at 35 °C. Quantitative analysis of limonene oxide indicated that the sample at 0.628 showed a very good stability against oxidation after thirty d, without caking and stickiness occurring. At this water activity the system was within rubbery state, and the moisture content corresponded to that of the minimum integral entropy.