Fig. 4

The floating percentage of core-shell beads with various chitosan/xanthan gum ratios, chitosan beads and alginate beads (n ≥ 3). The significant difference between core-shell beads with all the formulations and dense chitosan beads was indicated by * (p < 0.05) and ** (p < 0.01) from t-test at the same immersion time. The significant difference between core-shell beads with all the formulations and dense alginate beads was indicated by # (p < 0.05), ## (p < 0.01) and ### (p < 0.005) from t-test at the same immersion time (n ≥ 3). Chitosan and alginate beads were dense particles without core-shell structure. There is not significant differences between floating beads with different C/X (p > 0.15) from ANOVA test