Facilitated synthesis of inulin esters by transesterification

Area of Science:

• Biopolymer modification
• Green chemistry
• Surfactant development

Background:

• Inulin, a natural polyfructose from chicory, is a versatile biopolymer.
• Developing novel tensio-active derivatives from inulin can lead to new applications in various industries.
• Transesterification offers a pathway for modifying inulin's structure and properties.

Purpose of the Study:

• To modify inulin via transesterification with fatty acid methyl esters (FAME).
• To investigate the influence of different solvents (DMSO, NMP) and catalysts (DMSO-Na+, NaH, NaOMe) on the reaction.
• To develop potential tensio-active inulin derivatives for broader applications.

Main Methods:

• Inulin modification using transesterification with FAME in polar organic solvents (DMSO, NMP).
• Comparison of catalytic systems: DMSO-Na+, NaH, and NaOMe.
• Characterization of synthesized derivatives using 1H- and 13C NMR spectroscopy.
• Evaluation of reaction efficiency and reproducibility.

Main Results:

• Reaction efficiency using NaH was approximately 80%.
• Reaction efficiency using NaOMe was approximately 75%.
• The NaOMe in NMP method demonstrated suitability for larger-scale grafting.
• DMSO as a solvent resulted in undesirable odors in the end products.

Conclusions:

• Transesterification is an effective method for grafting alkyl chains onto the inulin backbone.
• The choice of solvent and catalyst significantly impacts reaction efficiency and product quality.
• The NaOMe/NMP system is the most promising for scalable synthesis of tensio-active inulin derivatives.
• Further research may focus on optimizing conditions to eliminate odor issues with DMSO-based methods.