Figures (6)  Tables (0)

    • Figure 1. 

      SEM images of (a) ZPs, (b) ZPPs, (c) SPs and (d) SPPs.

    • Figure 2. 

      GC–MS ion chromatograms of (a) stigmasterol and (b) POPs.

    • Figure 3. 

      Mass spectra of (a) 7α -hydroxy, (b) 7β-hydroxy, (c) 5α,6α-epoxy, (d) 5β,6β-epoxy and (e) 7-keto.

    • Figure 4. 

      (a) Remaining percentage of total stigmasterol. (b) Average particle size and zeta-potential of particles. The three-phase contact angle of (c) ZPs, (d) ZPPs, (e) SPs and (f) SPPs.

    • Figure 5. 

      POPs content derived from (a) 7β-hydroxy, (b) 7α-hydroxy and (c) 7-keto in particles under UV light exposure.

    • Figure 6. 

      POPs content derived from (a) 5α,6α-epoxy and (b) 5β,6β-epoxy in particles under UV light exposure.