# Natural Oils as Green Solvents for Reactive Extraction of 7-Aminocephalosporanic Acid: A Sustainable Approach to Bioproduct Recovery in Environmental Biotechnology

## TL;DR

This paper explores using natural oils as eco-friendly solvents to extract a key antibiotic compound, offering a sustainable alternative to harmful petroleum-based solvents.

## Contribution

The study introduces natural oils as viable green solvents for reactive extraction of 7-ACA, achieving high efficiency and aligning with green chemistry principles.

## Key findings

- Natural oils combined with tri-n-octylamine achieved over 50% extraction efficiency for 7-ACA.
- A system using grapeseed oil reached 63.4% extraction efficiency under optimized conditions.
- Slope analysis indicates a likely 1:1 complex formation between tri-n-octylamine and 7-ACA.

## Abstract

The growing need for environmentally friendly separation processes has motivated the search for alternative solvents to petroleum-derived chemicals for the recovery of biosynthesized products. Although effective, conventional petroleum-based solvents pose major environmental and sustainability concerns, including pollution, ecotoxicity, human health risks, and high costs and energy demands for recycling. Consequently, current research and industrial practice increasingly focus on their replacement with safer and more sustainable alternatives. This study investigates the use of natural oils (i.e., grapeseed, sweet almond, and flaxseed oils) as renewable, biodegradable, and non-toxic diluents in reactive extraction systems for the separation of 7-aminocephalosporanic acid (7-ACA). The combination of these oils with tri-n-octylamine (TOA) as extractant enabled high extraction efficiencies, exceeding 50%. The system comprising 120 g/L tri-n-octylamine in grapeseed oil, an aqueous phase pH of 4.5, a contact time of 1 min, and a temperature of 25 °C resulted in a 7-ACA extraction efficiency of 63.4%. Slope analysis suggests that complex formation likely involves approximately one molecule each of tri-n-octylamine and 7-ACA, although the apparent order of the amine is reduced in systems using natural oils. This study highlights the potential of natural oil-based reactive extraction as a scalable and environmentally friendly method for 7-ACA separation, aligning with the principles of green chemistry and environmental biotechnology.