Nanyang Technological University, Singapore (NTU Singapore) scientists have discovered a plant-based food preservative that is more effective than artificial preservatives. The organic preservative comprises naturally occurring flavonoids, a diverse group of phytonutrients found in almost all fruits and vegetables. The flavonoids created by NTU scientists have strong antimicrobial and antioxidant properties, two key traits of preservatives that inhibit bacterial growth and extend food freshness.