Safer Solvents for Active Pharmaceutical Ingredient Purification Using Column Chromatography.

Area of Science:

• Pharmaceutical Science
• Green Chemistry

Background:

• Column chromatography is vital for active pharmaceutical ingredient (API) purification.
• Traditional solvent systems like dichloromethane/methanol (DCM/MeOH) pose health, safety, and environmental risks.
• The pharmaceutical sector significantly contributes to chlorinated solvent waste.

Purpose of the Study:

• To evaluate and compare safer solvent blends as alternatives to DCM/MeOH for API purification via column chromatography.
• To assess the performance of these alternative blends in terms of API recovery and purity.
• To identify potential replacements for DCM/MeOH that offer health, safety, and environmental benefits.

Main Methods:

• Column chromatography was employed for API separation and purification.
• Alternative safer solvent blends were tested and compared against DCM/MeOH.
• Ibuprofen and acetaminophen served as model APIs, with caffeine as a model additive.

Main Results:

• Several tested safer solvent blends outperformed the traditional DCM/MeOH system.
• Higher API recovery and purity were achieved with specific alternative solvent blends.
• Blends of heptane/ethyl acetate and heptane/methyl acetate demonstrated significant promise.

Conclusions:

• Safer solvent blends can effectively replace DCM/MeOH in API purification.
• The identified alternatives offer enhanced performance and mitigate safety and environmental concerns.
• This research addresses a critical safety issue within the pharmaceutical industry through greener chemical practices.