2.6.2. Storage Stability of Quercetin and Particles

Samples were stored at 25 and 45 ◦C for 28 days inside an LRH-250F incubator (Yiheng Scientific Instrument Co., Ltd. Shanghai, China). The stability of quercetinloaded particles was analyzed in terms of particle size and ζ-potential during storage. The retention of quercetin was expressed as percent retention and calculated by using the following equation:

$$\text{Quercective iteration (\%)} = \text{Q}\_{\text{l}}/\text{Q}\_{\text{i}} \times 100\tag{4}$$

where Qi and Qt are the content of quercetin at the beginning and specific time intervals during storage.
