Figure 2: HPLC chromatograms of (1) a standard Lf (1 mg) solution in DI water, and Lf released from CaCO3 microparticles upon their dissolution at pH 3.

Lf was (2) co-precipitated with 48 mg CaCO3 at pH 8; post-loaded to (3) 60 and (4) 300 mg of CaCO3. Volume of all samples was 6 mL.