A General Protocol for Synthesizing Thiolated Folate Derivatives

Area of Science:

• Bioconjugation Chemistry
• Nanomedicine
• Drug Delivery Systems

Background:

• Folic acid (FA) is valuable for targeted drug delivery and diagnostics due to its tumor-targeting ability, biocompatibility, and affordability.
• Current methods for incorporating FA into drug delivery systems involve complex synthesis, leading to low yields and high costs.

Purpose of the Study:

• To develop a general, efficient protocol for synthesizing small molecule thiolated folate (TFa) derivatives.
• To demonstrate the utility of TFa in modifying nanoparticles for potential biological applications.

Main Methods:

• A novel green oxidation protocol synthesized an S-S-containing diol in water without a catalyst.
• Folic acid was esterified with the diol, followed by disulfide bond cleavage to yield TFa (>98.20% purity).
• Synthesized TFa was used to functionalize silver nanoparticles.

Main Results:

• The green oxidation protocol yielded the diol with >99.44% purity.
• The developed protocol efficiently synthesized TFa, a small molecule thiolated folate derivative.
• TFa demonstrated facile conjugation with metal nanoparticles, indicating its potential for nanomedicine applications.

Conclusions:

• A general and efficient protocol for synthesizing thiolated folate derivatives was established.
• The synthesized TFa is suitable for facile modification of nanoparticles.
• This method offers a cost-effective and versatile approach to enhance the biological applications of folic acid in targeted therapies and diagnostics.