Yanang (Tiliacora triandra) is used as a vegetable and herb in northeast Thailand. This work investigated the
stability of bioactive compounds in encapsulated Yanang leaves extract which was evaluated during storage at
different temperatures. In addition, the in vitro releasing the bioactive compounds in gastrointestinal tract (GI tract),
stomach (pH 1.2) and small intestine (pH 7.4) at 37ºC was studied. Finally, encapsulated Yanang leaves extract was
added to a food model system (soft drink model system) to find the effect of pH (pH 2, 3, 4, 5, 6, and 7) and
temperature/time (65 ºC for 30 min and 77 ºC for 1 min) treatments on the release of bioactive compounds. The
study of bioactive compounds in encapsulated Yanang leaves extract showed only a gradually reduction during
storage at 4-10 ºC for 3 months (> 50% residual). Moreover, encapsulated Yanang leaves extract was released in
small intestine (pH 7.4) more than in stomach (pH 1.2) at 24 hr and in the soft drink model system encapsulated
Yanang leaf extract was released at pH 4 and 77 ºC for 1 min. In conclusion, this study demonstrates the potential of
using hydrogel beads process in optimizing the encapsulation of herbal extract and it represents an interesting food
additive option for incorporation into functional foods.