Nitrogen-doped carbon was synthesized with BET surface area 1066 m2/g.
Alendronate was release in pH = 1.2, 4.5, 6.8 and 7.4 at 37 °C.
Only 20% of alendronate from carbon was released in pH = 1.2.
All alendronate was released in pH = 1.2 in 30 min only.