Olive waste valorization: advances in nutrient optimization and microbial engineering for lipid production

Area of Science:

• Biotechnology
• Microbiology
• Biochemistry

Background:

• Olive waste presents a sustainable feedstock for microbial lipid production.
• Nutrient imbalances and inhibitory compounds limit efficient lipid biosynthesis from olive mill residues.

Purpose of the Study:

• To review recent advancements in nutrient optimization and microbial engineering for enhanced lipid production from olive waste.
• To identify challenges and future directions for industrial-scale application.

Main Methods:

• Tailored medium formulations to optimize carbon-nitrogen ratios.
• Co-culturing systems to facilitate metabolic cross-feeding.
• Genetic engineering to enhance fatty acid biosynthetic enzyme activity.

Main Results:

• Optimized fungal and yeast systems achieved lipid content up to 60% (w/w).
• Nutrient control and microbial engineering significantly enhance lipid biosynthesis.
• Challenges remain in large-scale integration, including inhibitor detoxification and cost-efficiency.

Conclusions:

• Synergistic nutrient optimization and metabolic engineering are key for converting olive waste into high-value lipids.
• Future research should focus on process automation, genetic containment, and industrial scalability.
• Successful translation to industrial applications requires addressing environmental and techno-economic assessments for circular bioeconomy goals.