Production of chitin from shrimp shell powders using Serratia marcescens B742 and Lactobacillus plantarum ATCC 8014 successive two-step fermentation

► Chitin was extracted from SSPs using Serratia marcescens and Lactobacillus plantarum fermentation. ► Successive two-step fermentation was more effective than single step. ► Ultrasonic treatment was firstly introduced into microbial fermentation of SSPs. ► Prepared chitin has similar functional properties to the commercial one.