A biopolymer film is provided that comprises a combination of: crystalline nano cellulose (CNC)/esterified crystalline nano cellulose (ECNC) reinforced with chitosan. The two polymer components can be present in any ratio but an approximate CNC to ECNC 70:30 ratio is preferred. The chitosan component is derived from exoskeletons of crustaceans. Also provided are methods of preparing biopolymer film and preparing food packaging components from said biopolymer film. The CNC/ECNC mixture is dissolved in an ethanol solution and the chitin is dissolved in acetic acid and mixed together to form a polymer blend.

The present invention relates to a method for preparing low molecular weight hyaluronic acid having a molecular weight of 100,000 to 200,000 daltons, the method comprising heating treatment, in the pH range 2.5 to 3.5, for an aqueous solution that contains hyaluronic acid having a molecular weight of 500,000 daltons or greater.

In one embodiment, a method of removing a substance from a solution by adsorption includes: interfacing a delivery component containing a quantity of amine functionalized chitin (AFC) compound as an adsorbent AFC compound with the solution containing the substance as an adsorbate substance; mixing the adsorbent AFC compound and the adsorbate substance in the solution for a period of time; and removing a mixture of the adsorbent AFC compound and at least a portion of the adsorbate substance from the solution.

A method for at least partial deacetylation of a biopolymer comprising acetyl groups, including: a1) providing a biopolymer including acetyl groups; a2) reacting the biopolymer including acetyl groups with hydroxylamine (NH.sub.2OH) or a salt thereof at a temperature of 100° C. or less for 2-200 hours to form an at least partially deacetylated biopolymer; and a3) recovering the at least partially deacetylated biopolymer.

The invention includes chitosan nanofibers having enhanced structural integrity, compositions comprising such chitosan nanofibers, and related methods of use. In a particular aspect, electrospun chitosan nanofibers can be reversibly acylated to enhance structural integrity and promote healing and the formation of tissues in a subject. In another aspect, electrospun chitosan nanofibers comprising at least a portion of the amino groups protected, such as through N-tert-butoxycarbonyl groups, demonstrate enhanced structural integrity and promote healing and the formation of tissues in a subject. The invention also includes compositions and methods for producing a modified chitosan material having anti-inflammatory and pro-healing characteristics and methods of using the modified chitosan materials in a film, a gel, a membrane, microfibers, nanofibers, nano- or micro-particles/spheres and/or sponges. In some aspects, microspheres and methods of producing microspheres comprising modified chitosan are included.

A chitin-containing polyester filament and a preparation method of the chitin-containing polyester filament are provided. The method includes preparing a modified chitin; preparing a chitin-containing functional modifier based on the modified chitin; preparing polyester (PET) functional particles based on the chitin-containing functional modifier and PET pellets; preparing a mixed spinning solution based on the polyester functional particles, where a weight percentage of the polyester functional particles is in a range of approximately 2%-4% based on a total weight of the mixed spinning solution; and performing a spinning molding of the mixed spinning solution to form the chitin-containing polyester filament.

The invention relates to the field of derivatized cross-linked hyaluronic acid hydrogels having blood-derived proteins linked into their structure, as well as preparation and uses thereof.

The present application relates to a freeze-dried polymer composition containing chitosan and at least one lyoprotectant, a process for preparing a freeze-dried composition containing chitosan and at least one lyoprotectant and the use of a reconstituted freeze-dried chitosan composition to prepare implants for tissue repair.

The invention relates to a statistical polysaccharide with a weight-average molecular weight of between 100 kDa and 1000 kDa of the following formula (I): in which: each Rc independently represents a group containing a chelating agent, each Z independently represents a binder which may be a single bond or a hydrocarbon chain containing between 1 and 12 carbon atoms, said chain able to be either linear or branched and being able to contain one or more unsaturations and being able to contain one or more heteroatoms, preferably chosen from nitrogen, oxygen, sulfur and atoms of the halogen family, x is between 0.005 and 0.7, preferably between 0.05 and 0.7, and preferentially between 0.2 and 0.6, y is between 0.01 and 0.7, preferably between 0.05 and 0.2, the ratio of y/x being greater than or equal to 0.05, preferably greater than or equal to 0.15, and the sum of x+y being greater than or equal to 0.30, preferably greater than or equal to 0.35. The invention also relates to the use of said polysaccharide in a dialysis process in order to capture at least one metal, in an MRI imaging process, in a brachytherapy process or in a process for marking foodstuffs to prevent forgeries.

The invention provides a hydrogen sulfide releasing polymer compound having a polysaccharide backbone, wherein the compound has at least two substructures, and wherein said substructures are capable of releasing hydrogen sulfide by thiol activation as well as uses thereof. Additionally, a method of treatment and prevention of a skin condition, an ocular disease or osteoarthritis is provided.