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Inhibition of Peptide Acylation in PLGA Microspheres with Water-soluble Divalent Cationic Salts

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Abstract

Purpose

To test the potential of water-soluble divalent cationic salts to inhibit acylation of octreotide encapsulated in poly(D,L-lactic-co-glycolic acid)-star (PLGA) microspheres.

Methods

The divalent cationic salts, calcium chloride and manganese chloride, previously shown to disrupt peptide sorption, were introduced in PLGA microspheres prepared by the double emulsion-solvent evaporation method. Peptide stability was monitored by reversed-phase high performance liquid chromatography (RP-HPLC) and identified by liquid chromatography coupled with mass spectrometry (LC-MS) during microsphere degradation under physiological conditions for 4 weeks. Microsphere morphology and salt content were examined by scanning electron microscopy (SEM) and inductively coupled plasma-optical emission spectroscopy (ICP-OES), respectively.

Results

Addition of divalent cationic salts solely to the organic phase did not provide acylation inhibition. However, addition of the salt inhibitors to both the primary emulsion and the outer water phase resulted in improved drug and salt encapsulation efficiency as well as significantly decreased salt leaching and octreotide acylation. After 28 days, the extent of acylation inhibition afforded by divalent cations was > 58% relative to 13% for the NaCl control group.

Conclusions

Water-soluble divalent cationic salts represent a suitable class of stabilizer of peptide acylation in PLGA microspheres and this study provides an important formulation approach to maximize stabilizer potency.

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ACKNOWLEGMENTS

This study was supported by Novartis Pharma AG and NIH HL 68345.

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Authors and Affiliations

  1. Department of Pharmaceutical Sciences, University of Michigan, Ann Arbor, Michigan, 48109, USA

    Ying Zhang, Andreas M. Sophocleous & Steven P. Schwendeman

  2. Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, 48109, USA

    Andreas M. Sophocleous

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  1. Ying Zhang
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Correspondence to Steven P. Schwendeman.

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Zhang, Y., Sophocleous, A.M. & Schwendeman, S.P. Inhibition of Peptide Acylation in PLGA Microspheres with Water-soluble Divalent Cationic Salts. Pharm Res 26, 1986–1994 (2009). https://doi.org/10.1007/s11095-009-9914-2

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  • DOI: https://doi.org/10.1007/s11095-009-9914-2

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