Chitosan is a derivative of chitin, a compound usually isolated from the shells of some crustaceans such as crab, lobster and shrimp. It has biocompatible, biodegradable, and antimicrobial properties. To use these properties of chitosan in biomedical fields, chitosan films (1%, 2%, 3% and 4%) were prepared by using l% lactic acid as solvent. The effects of chitosan films on tensile strength, el...

Four Chitin degrading bacterial strains vibrio aestuarianus, Flavobacterium, Shewenella and Exiguobacterium were isolated from crustacean shells. The strains were confirmed by Biochemical analysis, FAME-GC analysis and 16s rDNA sequencing. The chitinase was purified by a two step chromatographic method and characterized. The enzyme was purified to homogeneity by 6.75 fold with 46% recovery afte...

Chitin a natural polymer extracted commercially from the shells of crustaceans such as prawns, crabs, krill, insects and shrimps. Chitosan is prepared from chitin by partially deacylating its acetamido groups with a strong alkaline solution. Chitin and chitosan have a wide variety of applications such as wastewater treatment which decreases the Chemical Oxygen Demand [COD] and used in preventin...

Abstract Thiolate-protected gold nanoclusters (AuNCs) have been intensively studied due to their appealing physicochemical properties that can be used in various applications, especially catalysis. However, thiolate-protected AuNCs a free suspension form, tend aggregate during catalytic reaction the high surface reactivity of its ultrasmall size, hence, reducing rate reaction. Their recovery an...

Every year, over 8 million tons of crustacean shells are discarded. However, there exists an opportunity for valorizing the chitin and calcium carbonate part composition shells. Our study revealed reduces self-aggregation effects. It was shown that crustacean-based nanofibers alone or added to cellulose offer unprecedented reductions in viscosity even after drying produce foams impossible cellu...

Abstract Marine Vibrio species are natural degraders of chitin and usually secrete high levels chitinolytic enzymes to digest recalcitrant chitooligosaccharides. This study used an endochitinase ( Vh ChiA) from campbellii produce high-quality chitobiose crustacean chitins. The enzyme was shown be fully active stable over 24 h when BSA as additive. When different sources were tested, ChiA prefer...

Acidic macromolecules, as a nucleation factor for mollusc shell formation, are a major focus of research. It remains unclear, however, whether acidic macromolecules are present only in calcified shell organic matrices, and which acidic macromolecules are crucial for the nucleation process by binding to chitin as structural components. To clarify these questions, we applied 2D gel electrophoresi...

 Chitinases have received attention because of their wide applications in the medicine, biotechnology, agriculture, waste management and industrial applications such as food quality enhancer and biopesticide. Excessive use of insecticides has led to several problems related to pollution and environmental degradation. In this study, isolation and identification of native bacterial strains with c...

Chitin is one of the most common polysaccharides and abundant in cell walls fungi shells insects aquatic organisms as a skeleton. The mechanism how chitin responds to pH essential precise control brewing design smart materials. However, this molecular remains mystery. Results from single-molecule studies, including force spectroscopy (SMFS), AFM imaging, dynamic (MD) simulations, have shown tha...