Folate shows two peaks at 285nm and 360nm. NP-OG-FS-Rh-folate-NMC
(blue) also shows two shoulders at 285nm and 360nm which demonstrates
that folate was bounded to the particles. NP-OG-FS-Rh-NMC and NP-OG-FSRh-
folate-NMC demonstrates two peaks at 500nm and 550nm, which were
contributed from OG/FS and Rh