Effect of intense pulsed light on <i>Lactobacillus bulgaricus</i> exopolysaccharide yield, chemical structure and antioxidant activity
Xinyu Ge, Fengming Ma, Baiqing Zhang
Abstract
Summary In this work, IPL technology was used for improving the production of exopolysaccharide (EPS) in Lactobacillus bulgaricus . The effects of fluence per pulse, pulse number and pulse distance were investigated. Through GC–MS, Fourier transform infrared (FT‐IR), 1 H nuclear magnetic resonance ( 1 H NMR), X‐ray diffraction (XRD) and scanning electron microscopy (SEM) study the influence on EPS primary chemical structure and surface morphology. The antioxidant activity of EPS was evaluated by DPPH, Fe 2+ chelating and reducing power assays. The findings demonstrate that IPL could be a novel environment protection method for improving the production of EPS. The research results provide a theoretical basis for whether IPL is a new type of environmental protection method and can be used to improve EPS production.