AAPS PharmSciTech

, 20:159 | Cite as

Evaluation of Hydrogenated Soybean Phosphatidylcholine Matrices Prepared by Hot Melt Extrusion for Oral Controlled Delivery of Water-Soluble Drugs

  • Marina Kolbina
  • Adrian Schulte
  • Peter van Hoogevest
  • Martin KörberEmail author
  • Roland Bodmeier
Research Article Theme: Lipid-Based Drug Delivery Strategies for Oral Drug Delivery
Part of the following topical collections:
  1. Theme: Lipid-Based Drug Delivery Strategies for Oral Drug Delivery


The aims of this study were to prepare hydrogenated soybean phosphatidylcholine (HSPC) matrices by hot melt extrusion and to evaluate resulting matrix potential to extend drug release in regard to drug loading and solubility for oral drug delivery of water-soluble drugs. The liquid crystalline nature of HSPC powder allowed its extrusion at 120°C, which was below its capillary melting point. Model drugs with a wide range of water solubilities (8, 20 and 240 mg/mL) and melting temperatures (160–270°C) were used. Extrudates with up to 70% drug loading were prepared at temperatures below the drugs’ melting points. The original crystalline state of the drugs remained unchanged through the process as confirmed by XRPD and hot-stage microscopy. The time to achieve 80% release (t80) from extrudates with 50% drug loading was 3, 8 and 18 h for diprophylline, caffeine and theophylline, respectively. The effect of matrix preparation method (extrusion vs. compression) on drug release was evaluated. For non-eroding formulations, the drug release retarding properties of the HSPC matrix were mostly not influenced by the preparation method. However, with increasing drug loadings, compressed tablets eroded significantly more than extruded matrices, resulting in 2 to 11 times faster drug release. There were no signs of erosion observed in extrudates with different drugs up to 70% loadings. The mechanical robustness of HSPC extrudates was attributed to the formation of a skin-core structure and was identified as the main reason for the drug release controlling potential of the HSPC matrices produced by hot melt extrusion.


HSPC hot melt extrusion extended release matrix mathematical modelling oral controlled release 



This work was supported by Phospholipid Research Center (Heidelberg, Germany). The authors thank Eva Hepke (Technische Universität Berlin) for technical support with XRPD measurements.

Supplementary material

12249_2019_1366_MOESM1_ESM.docx (3.2 mb)
ESM 1 (DOCX 3231 kb)


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Copyright information

© American Association of Pharmaceutical Scientists 2019

Authors and Affiliations

  • Marina Kolbina
    • 1
  • Adrian Schulte
    • 2
  • Peter van Hoogevest
    • 3
  • Martin Körber
    • 4
    Email author
  • Roland Bodmeier
    • 1
  1. 1.College of PharmacyFreie Universität BerlinBerlinGermany
  2. 2.Lipoid GmbHLudwigshafenGermany
  3. 3.Phospholipid Research CenterHeidelbergGermany
  4. 4.Pensatech Pharma GmbHBerlinGermany

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