Eco-Innovations in Biopigment Production by Bacteria—Challenges and Future Prospects

The market for bio-based pigments is growing rapidly, fuelled by the demand for safe, biodegradable colourants in food, cosmetics, pharmaceuticals and textiles. Bacterial pigments offer vibrant colours as well as antimicrobial, antioxidant, anti-inflammatory and anti-cancer properties that increase product safety and shelf life. Despite their benefits, the production of bacterial pigments is associated with challenges such as low yields, high costs and complex processing. Recent eco-innovations such as metabolic engineering, the use of agro-industrial waste as cheap substrates and environmentally friendly extraction methods are helping to solve these problems while promoting the principles of the circular economy. In addition, extremophilic bacteria from harsh environments provide novel pigments with unique industrial potential. This review highlights key advances in eco-innovations for bacterial biopigment production, focusing on genetic engineering, sustainable substrate use, co-production strategies, process optimisation. The role of artificial intelligence and machine learning in improving the biosynthetic efficiency of biopigments will also be analysed. Finally, current challenges and future research opportunities will be discussed to advance microbial biopigments as scalable, cost-effective and environmentally conscious alternatives to synthetic colourants in various industries.