The present invention relates to a chitin having a molecular mass of more than 855 kg.Math.mol-1 and to a process for obtaining chitin and/or chitosan by separating cuticles from the soft part of the insect and by a basic treatment of the cuticles.

A glycophospholipid polymer is disclosed. The glycophospholipid polymer comprises a reaction product of one or more glycosaminoglycans and one or more phospholipids. Also disclosed is a glycophospholipid polymeric network comprising a reaction product of one or more glycosaminoglycans, one or more phospholipids and, one or more crosslinking agents.

A poly-[1-4]-D-glucosamine derivative comprising [1-4]-D-glucosamine recurring units and comprising a fluoropolyether chain bound to the nitrogen atom in the C-2 position of at least one of the [1-4]-D-glucosamine recurring units.

Various embodiments disclosed relate to treatment fluids comprising a compound of the formula (I): wherein G.sub.1, G.sub.2, L.sub.1, L.sub.2, L.sub.3, q, and r are defined herein. Various other embodiments relates to methods of treating subterranean formations with such treatment fluids. ##STR00001##

Several embodiments of NO releasing structures are disclosed. In some embodiments, the structures are covalently modified to store and release nitric oxide. Some embodiments pertain to methods of making and use of these structures. The covalently modified polymer structures may be tailored to release nitric oxide in a controlled manner and are useful for treatment of various medical conditions.

Synthesis of modified chitosan particles for oral insulin delivery includes amidation of chitosan with a fatty acid, a modified fatty acid, and/or an amino acid. The amidated chitosan can be grafted with N-isopropylacrylamide (NIPAm) and cross-linked to provide the modified chitosan particles.

The present disclosure provides a composition comprising a first polymer with a high intrinsic viscosity [η] of at least 500 ml/g and a second polymer with a low intrinsic viscosity [η] lower than the first polymer and less than 1800 ml/g. More specifically, the present disclosure provides a hydrogel formed with the composition and a pharmaceutical, as well as a method for generating a hydrogel.

The present disclosure relates to a biocompatible composition and a method for preparing the same, and a hybrid composition of β-glucan and hyaluronic acid is prepared by hybrid cross-linkage. The biocompatible composition of the present disclosure high stability against heat and bio-enzymes, and thus is capable of being used as a medical material.

A method for preparing an MOFs flame retardant modified by layer-by-layer self-assembly of an intumescent flame retardant is provided. The method mainly includes the steps of preparing MOFs, a positive electrolyte solution, and a negative electrolyte solution; dispersing the MOFs in the negative electrolyte solution; dispersing an obtained mixture in the positive electrolyte solution; obtaining a first double-molecule self-assembled layer on surfaces of the MOFs; and repeating the above operations for several times to obtain an MOFs flame retardant modified by intumescent self-assembled layers. The modified MOFs flame retardant of the present disclosure has excellent flame retardancy, flame retardant synergism, and dispersibility, and the defects of poor dispersibility and low flame retardant efficiency of MOFs flame retardants are overcome. A great application prospect is achieved.

The present invention relates to a carboxyalkyl chitosan, compositions comprising same, a process for manufacturing same, and various applications thereof, in particular in the field of therapy, rheumatology, ophthalmology, esthetic medicine, plastic surgery, internal surgery, dermatology or cosmetics.