Table 1.

Comparison of the surface ζ‐potentials of different BaSO₄ NPs at pH 6 and pH 8

Sample	Surface ζ‐potential
	pH 6	pH 8
Unlabeled BaSO4 NPs without alendronate	18.6 mV	−15.2 mV
Unlabeled alendronate‐ containing BaSO4 NPs (free amines)	19.5 mV	−14.7 mV
FITC‐labeled alendronate‐ containing BaSO4 NPs	11.2 mV	−15.1 mV