Comprehensive Characterization of Oligolactide Architecture by Multidimensional Chromatography and Liquid...

Area of Science:

• Polymer Chemistry
• Analytical Chemistry
• Materials Science

Background:

• Oligolactides (OLA) are crucial in biomedical applications like drug delivery and tissue engineering.
• Standard synthesis methods yield complex OLA structures, posing analytical challenges.

Purpose of the Study:

• To develop a robust separation method for comprehensive analytical characterization of OLA.
• To investigate the impact of initiators on OLA molecular heterogeneity.
• To elucidate the separation mechanism of OLA chains.

Main Methods:

• A novel normal-phase high-performance liquid chromatography (HPLC) method using ethanol-modified chloroform.
• Two-dimensional liquid chromatography (2D-LC) by hyphenating HPLC with size exclusion chromatography (SEC).
• Online coupling of HPLC with mass spectrometry (LC-MS).

Main Results:

• The developed HPLC method effectively separates OLA chains based on their degree of polymerization or lactide incorporation.
• Two-dimensional chromatography elucidated the separation mechanism.
• LC-MS provided detailed insights into the molecular heterogeneity of OLA.

Conclusions:

• A robust HPLC method is established for analyzing OLA molecular heterogeneity.
• Correlative characterization techniques are vital for understanding microstructural variations in OLA.
• This work supports the advancement of OLA applications in biomedicine.