Chitin, a type of abundant naturally occurring carbohydrate polymers, consists of N-acetyl-d-glucosamine (GlcNAc) units linked by β-(1,4) glycoside bonds [1]. Chitins are mainly dispersed in outer shell of crustaceans and insect cuticles, and fungal cell walls, composing one of the largest forms of renewable biomass on earth next to cellulose [2]. Chitinases (EC 3.2.1.14) can hydrolyze chitin to release N-acetyl chitooligosaccharides (GOSs) and GlcNAc [2]. They have received a great deal of attention in recent years due to their biotechnological applications in different fields [3]. They can be used in the production of N-acetyl GOSs [4] and GlcNAc [5] in food or pharmaceutical industry [2], bioconversion of chitin materials to ethanol in energy industry [6], production of single cell protein in feed industry [7] and bio-controlling of fungal phytopathogens in agriculture [8] and [9].