Pilot-scale manufacturing of pectic-oligosaccharides from industrial potato peel wastes for bio-based agrochemicals industry

This study optimized the production of pectic-oligosaccharides (POS) in a 2-L reactor, producing three products (POS-P1, POS-P2, POS-P3) through an alkaline hydrogen peroxide process (1–3% w/w, 90°C for 4 h). POS exhibited high antioxidant activity, with DPPH• and ABTS•+ scavenging rates of 33.7–91.7% and 47.0–99.0%, respectively, and phenolic content ranging from 301.3–612.9 mg GAE/L. POS-P2 and POS-P3 showed antibacterial activity against Erwinia carotovora and Xanthomonas oryzae. POS-P2 enhanced chlorophyll and antioxidant levels in rice plants and reduced browning in apples. POS produce from potato peel waste (POS-P1N, POS-P2N, POS-P3N) which obtained from a new company had lower molecular size but higher phenolic content (593.4–1,404.3 mg GAE/L) and lacked antibacterial effects. POS-P3N residue was an effective soil substitute for wheatgrass. The 2-L scale production cost ranged from 668–715 baht/L.