摘要:
The present invention relates to plant cells and plants which synthesize hyaluronan and to methods for preparing such plants, and also to methods for preparing hyaluronan with the aid of these plant cells or plants. Furthermore, the present invention relates to the use of plants for preparing hyaluronan and to food or feed which comprises hyaluronan.
摘要:
A partially purified product of a hyaluronic acid salt obtained from a culture of a microorganism capable of producing hyaluronic acid, preferably a microorganism belonging to the genus Streptcoccus, is brought into contact with a solution containing a salt and a hydrophilic organic solvent, thereby transferring to a liquid phase, impurities contained in said partially purified product such as proteins, nucleic acids, colorants, endotoxins and the like, and then isolating the hyaluronic acid salt as a precipitate.
摘要:
Described herein are macromolecules modified with electrophilic groups and methods of making and using thereof. The preparation of a thiol-reactive, electrophililic derivative of HA in order to prepare 'crosslinker-free' hydrogels are described as well as compounds and methods that are capable of coupling two or more molecules, such as macromolecules, under mild conditions. Specifically disclosed is the introduction of reactive bromo- and iodoacetate functionalities at the hydroxyl groups that are abundantly present on the HA polymer. The 'crosslinker- free' hydrogels described have numerous applications including, but not limited to, drug delivery, small molecule delivery, wound healing, burn injury healing, tissue regeneration/engineering, cell culturing, and bio-artificial materials.
摘要:
La présente invention concerne des gels injectables de polysaccharides, comprenant au moins un premier gel de polysaccharide fortement réticulé sous forme de particules, et au moins un second gel de polysaccharide faiblement réticulé formant matrice, ledit au moins premier gel étant lié par liaisons de covalence audit au moins second gel. Procédé de préparation desdits gels injectables, et utilisations notamment en chirurgie réparatrice, en chirurgie esthétique, et en chirurgie de comblement des tissus biologiques.
摘要:
The invention concerns a dextran and/or dextran derivative bifunctionalized by at least one imidazolyl radical (Im) and at least one hydrophobic group (Hy), said radical and group being each, identical and/or different, and, grafted or bound to the dextran and/or dextran derivative by one or more linker arms R, Ri or Rh and functions F, Fi or Fh as well as pharmaceutical compositions comprising one of said dextrans and at least one active principle.
摘要:
A hyaluronic acid derivative, and methods of producing and using said derivative, the derivative comprising n repeating units and having the general structural formula (I), wherein, in at least one repeating unit, one or more of R1, R2, R3, R4 comprises an etherbound aryl/alkyl sulfone having the general structural fomula (II), wherein R comprises an alkyl- or aryl-group, and otherwise R1, R2, R3, R4 are hydroxyl groups, OH.
摘要:
The invention relates to a pharmaceutical composition that is free from dexpanthenol, calcium ions, and phosphate and comprises at least one calcium chelating agent, at least one ophthalmologically compatible viscosity regulator, and one or several optional pharmaceutical adjuvants. The invention further relates to the use of a calcium chelating agent and an ophthalmologically compatible viscosity regulator for producing a phosphate-free pharmaceutical composition used for the treatment and/or prevention of epithelial defects.
摘要:
A hyaluronic acid gel composition comprising hyaluronic acid and a polymer, which is substantially unmodified with a chemical cross-linking agent or a chemical modifying agent and which has a percentage dissolution of hyaluronic acid of 50% or lower in 12 hours in a neutral aqueous solution of 37 DEG C.
摘要:
Present invention relates to a method for preparing low molecular weight hyaluronic acid and the salt thereof from high molecular weight hyaluronic acid using by ion exchange resin and it has various advantages over prior arts such as easy to mass production, economic production, uniform production of purposed low molecular weight hyaluronic acid, prevention of the ring cleavage of monosacchride in hyaluronic acid occurring in chemical hydrolysis and undesired formation of by-product having double bonded sugar ring occurring in enzymatic hydrolysis. Therefore, the inventive method of the present invention could provide effective and economic method for preparing low-molecular weight hyaluronic acid with mass production and low cost and the low molecular weight hyaluronic acid and the salt thereof prepared from the method of the present invention may extensively be used as a medicine, cosmetic, medical material, food additives etc.
摘要:
The invention provides in a first aspect a method for controlling the content of selected component(s) in one or more polymer(s) by: (a) contacting the polymer(s) with at least one molecular sieve; and optionally (b) isolating the polymer from the molecular sieve(s).