Exploring the metabolic features of purple non-sulfur bacteria for waste carbon utilization and single-cell protein synthesis

Abstract In recent years, single-cell protein (SCP) has been considered a promising aquaculture feed to cope with the growing issue of food security. SCP is derived from microbes including algae, yeasts, and bacteria. Algae yeasts have comprehensively studied as sources in last few years. However, their large-scale application not yet economical. Recently, use purple non-sulfur bacteria (PNSB) realized sustainable source SCP. PNSB display unique metabolic features that distinguish them other sources. They can grow under various light electron donor/acceptor conditions, variety low-cost carbon sources, give high substrate yield preferred photoheterotrophic growth mode, demonstrate anti-pathogenic properties. also infrared region enables straightforward enrichment non-axenic conditions. Despite characteristics PNSB, widely reported. This review provides comprehensive knowledge about different factors influence quality quantity produced PNSB. The effects key light, redox trace metals, substrate, availability are discussed. Special focus given PNSBs concomitant role improving water quality. information would expand enhance understanding utilize an alternative for feed.