In Figure 2, we were misled by the wrong naming of images during the SEM experiment, which caused us to present incorrect images in panels g and h. Because the morphology of all samples observed by SEM imaging was the same, replacement of panels g and h does not impact the main conclusions of the paper. However, it is important to show the presence of larger particles in SEM images when high-molecular weight hyaluronic acid was used for the formation of the particles. Particle size values, measured by dynamic light scattering, are presented in Figure 2a, and therefore, interpretations related to the size distribution remain valid even after replacement of the aforementioned images in the corrected Figure 2.
Figure 2.
Physicochemical characterization of the HA particles prepared by HA polymers with different MWs. LMW, MMW, and HMW denote the particles prepared with low-, middle-, and high-MW HA, respectively. (a) Size and ζ potential of the HA particles. (b) FTIR spectra of HA particles, indicating bands at 1602 cm–1 for −COOH groups of the HA and at 1030 cm–1 for S–O and C–S stretching frequencies of DVS. (c) TGA of the HA particles. (d) Size–pH correlation of the HA particles. (e) ζ potential of the particles under different pH conditions in a 0.01 M KCl solution. The pH was adjusted using 0.1 M NaOH and 0.1 M HCl. (f–h) SEM images of the HA particles prepared with low-, middle-, and high-MW HA polymers, respectively. Scale bars are 2 μm.