Physicochemical properties and stability of blank NPs and mel-NPs.

<p>(<b>A</b> and <b>B</b>) Size and zeta potential of blank NPs and mel-NPs immediately following preparation. (<b>C</b> and <b>D</b>) Size and zeta potential of blank NPs and mel-NPs following incubation for up to 3 days at pH 7.4 or pH 4.4. Error bars represent S.D. of n = 3 replicates, NS p>0.05, ** p<0.01, *** p<0.001.