2.4.7. Particle Size and Zeta Potential of Oleoresin
Particle size and zeta potential were analyzed using a dynamic light scattering (DLS) particle size analyzer (Delsa Max Pro, Beckman Coulter, Kraemer Blvd. Brea, CA, USA) at 25 °C. Prior to analysis, oleoresins were diluted in ultra-pure water at the 1:100 (w/v) ratio and dispersed using an ultrasound bath for 10 minutes and high-shear homogenizer (Omni THModel TH-115, Omni International, Kennesaw GA, USA) for 10 min with inner and outer probe diameters of 7 mm x 125 mm (de Aguiar et al., 2021; Nikiforidis & Kiosseoglou, 2009). The measurements were repeated twice for each replication and their average was used.