Cuticular chitin synthase and chitinase mRNA of whiteleg shrimp Litopenaeus vannamei during the molting cycle a b s t r a c t a r t i c l e i n f o Chitin metabolism is of high relevance for shrimp growth because it has to be synthesized and cleaved in each molt. We studied chitin synthase and chitinase mRNAs from whiteleg shrimp Litopenaeus vannamei. For this, cDNA coding for cuticular chitin ...

In the paper, fermentation conditions and medium of bacillus subtilis protease production were optimized to improve outcome produced from provide premium raw materials for subsequent preparation chitin crab shell. The optimal are temperature at 39°C, pH value 7.5, time 60h, inoculum size 5%, filling volume 80/250mL, rotational speed 180r/min; component ratio is 1.25% starch mass concentration, ...

Finding a cheap and easily recycling material that can capture CO2 under atmospheric pressure (1 atm) is of paramount importance. In this context, combining ionic liquids (ILs) with abundant natural materials, such as chitin-based biopolymers, appears an interesting alternative. work, four acetate-based ILs were selected to explore the solubility chitin, chitosan, carboxymethyl-chitosan. Using ...

Both the need for shelter and the need for food can be motivations that alter animal behaviour. We tested the hypothesis that the hermit crab, Pagurus samuelis, deprived of food, shells, or both will respond differently from control hermit crabs when presented with food and shells concurrently. We measured the number of contacts made with both food and shells, and time elapsed until hermit crab...

Chitin is an abundant polysaccharide found in fungal cell walls, crustacean shells, and insect exoskeletons. The immunological properties of both chitin and its deacetylated derivative chitosan are of relevance due to frequent natural exposure and their increasing use in translational applications. Depending on the preparation studied and the endpoint measured, these compounds have been reporte...

Astaxanthin is a xanthophyll carotenoid possessing impressive nutraceutical, antioxidant, and bioactive merits. Traditionally, astaxanthin extracted from crustacean wastes via solvent extraction methods. However, the rigid structure of shells that comprise complex proteins chitin challenges process. This investigation addressed an efficient microbial-assisted method to facilitate recovery crab ...

Biomineralization research on mollusc shells has mostly focused on nacre formation. Chitin, silk fibroin protein, and acidic macromolecules are important components for shell formation. Although the principle concept behind shell calcification was developed many years ago, the individual components have not been well scrutinized. Besides that, Mollusca are the second largest invertebrate phylum...

This research aims to study the production of chitosan from shrimp shell (Litopenaeus vannamei) of waste origin using two chemical methodologies involving demineralization, deproteinization, and the degree of deacetylation. The evaluation of the quality of chitosan from waste shrimp shells includes parameters for the yield, physical chemistry characteristics by infrared spectroscopy (FT-IR), th...

Worldwide every year approximately 140 million tonnes of synthetic polymers are produced. These polymers are stable and their degradation cycle in the biosphere is limited. This necessitates the need for natural biodegradable polymers which fit into the ecological cycle. Among these biopolymers, chitosan, a partially deacetylated form of biopolymer chitin has been receiving more attention due t...

Lipo-chitinoligosaccharides (LCOs) are key molecules for the establishment of plant-microorganisms symbiosis. Interactions of leguminous crops with nitrogen-fixing rhizobial bacteria involve Nod factors, while Myc-LCOs improve the association of most plants with arbuscular mycorrhizal fungi. Both Nod factors and Myc-LCOs are composed of a chitinoligosaccharide fatty acylated at the non-reducing...