Improvement of physicochemical stability and digestive properties of quercetagetin using zein-chondroitin sulfate particles prepared by antisolvent co-precipitation.

Zein-quercetagetin-chondroitin sulfate (Zein-Que-CS) composite nanoparticles with different compositions were successfully fabricated using a novel antisolvent co-precipitation method. The mean particle diameter (97.5 to 219.4 nm), negative surface potential (-29.9 to -51.1 mV), and turbidity (265 to 370 NTU) of suspensions of Zein-Que nanoparticles increased after the addition of CS. Electrostatic attraction, hydrogen bonding, and hydrophobic attraction were the main driving forces for the formation of the composite nanoparticles. The encapsulation efficiency and loading capacity of the quercetagetin within the Zein-Que-CS (100:10:30) nanoparticles were 91.6 % and 6.1 %, respectively. The photostability and thermal stability of the encapsulated quercetagetin were 3.4- and 3.2- fold higher than that of the free form. The nanoparticles had good resistance to sedimentation and exhibited slow-release properties under simulated gastrointestinal conditions. The Zein-Que-CS nanoparticles developed in this study may therefore be useful for the encapsulation, protection, and delivery of quercetagetin.