Particle size distribution of the synthesized NPs was analyzed using dynamic light scattering on DynaPro-TC-04 DLS instrument (Protein Solutions, Wyatt Technology, Santa Barbara, CA) the size distribution of as-synthesized NPs was also observed by Nanophox particle size analyzer (Sympatec GmbH, Clausthal-Zellerfeld, Germany). To evaluate the stability and surface charge of the as synthesized 5-FU NPs, zeta potential was determined using DTS software (Malvern Instruments, Worcestershire, UK) based on M3-PALS technology following a method standardized in our laboratory38 (link). 5-FU NPs were suspended in phosphate buffer (10 mM, pH 7.4) and thoroughly mixed in a cyclo-mixer for 1 min and used for zeta sizing as well as surface charge determination.
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