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Updated: Aug 5, 2026
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Dynamic Light Scattering Analysis for the Determination of the Particle Size of Iron-Carbohydrate Complexes
Published on: July 7, 2023
Structure-Function Relationships in Polysaccharide-Iron Complexes: Molecular Characterization, Acid-Stress Release
Xiangqiu Qi1, Hongwei Zhu1, Xin Yan2
1Quzhou Fudan Institute, Quzhou 324002, China.
Pharmaceutics
|July 28, 2026
Summary
Polysaccharide-iron complexes (PICs) vary in gastrointestinal tolerability. Structural differences, not just iron content, influence how PICs affect gut health, impacting mucosal integrity and iron absorption.
Area of Science:
- Pharmacology
- Materials Science
- Gastroenterology
Background:
- Polysaccharide-iron complexes (PICs) are common oral iron supplements with variable gastrointestinal (GI) tolerability.
- As non-biological complex drugs (NBCDs), PICs' structural heterogeneity may influence their function and tolerability.
- Understanding the link between PIC structure and GI effects is crucial for improving oral iron therapy.
Purpose of the Study:
- To investigate the structure-function relationship of two commercial polysaccharide-iron complexes (PICs).
- To explore how distinct structural attributes and iron release profiles impact gastrointestinal tolerability.
- To evaluate the suitability of multi-dimensional characterization for PIC quality assessment.
Main Methods:
- Comparative analysis of two PIC preparations using gel permeation chromatography (GPC), mass spectrometry (MS), FTIR, and NMR.
- Monosaccharide composition analysis and in vitro acid-stress iron release studies.
- In vivo assessment of gastrointestinal mucosal tolerability in rats.
Main Results:
- PIC sample A showed uniform monosaccharide composition but macromolecular heterogeneity, with stable iron retention and preserved mucosal integrity.
- PIC sample B, with varied monosaccharide composition and faster iron release, induced mucosal injury despite lower local iron retention.
- Distinct structural and release profiles correlated with differential GI tolerability in a rat model.
Conclusions:
- Gastrointestinal tolerability of PICs is linked to structural characteristics and iron release kinetics, not solely total iron content.
- Multi-dimensional structural analysis provides insights into PIC performance and tolerability.
- Structure-informed quality evaluation frameworks are needed for complex oral iron therapies like PICs.
Keywords:
acid-stress releasegastrointestinal tolerabilityintestinal iron depositionnon-biological complex drugspolysaccharide–iron complexquality evaluationstructure–function relationshipMore Related Videos
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