摘要:
Phenols are oxidated to quinones with hydrogen peroxide in the presence of catalytic amounts of bromine, iodine, hydrogen bromide and hydrogen iodide.
摘要:
The present invention is directed to a multistep process for the physical depolymerization of heparin wherein heparin is subjected to at least two γ-ray irradiations and wherein between two irradiation steps the depolymerised heparin is subjected to a separation step and only a fraction of the depolymerised heparin obtained from the first irradiation is subjected to the second irradiation step. It is also directed to heparin-derived oligosaccharide fractions obtainable by the process of the invention.
摘要:
Polysaccharides are functionalized using a source of free radicals which forms stable radicals on the polysaccharides structure and wherein the formed radicals reacts with a functionalized unsaturated compound. The method comprises two steps: a first step, wherein the free radical on the polysaccharides chain is formed, and a second step, wherein said radical reacts with the unsaturated compound in the absence of the radical source.
摘要:
The invention relates to a process for the depolymerization of glycosaminoglycanes characterized by the use of UVC radiation. The invention also relates to the intermediate depolymerized heparin obtained by the process. The intermediate depolymerized heparin can be dissolved in a buffer solution and fractionated by Gel Permeation for obtaining the desired Molecular Weight.
摘要:
The present invention is directed to sulfated oligosaccharides having 4, 5 or 6 saccharidic units and wherein a glycosidic bond between two saccharide units is substituted by a C—C bond, and wherein the sulfation degree expressed as percentage of OH groups substituted by a OSO3− group is comprised between 50 and 100%. The sulfated oligosaccharides according to the invention are useful as a drug, in particular in the treatment of angiogenesis, metastasis, and inflammation.
摘要:
The invention relates to a process for the depolymerization of glycosaminoglycanes characterized by the use of electron beam radiation, optionally in the presence of an organic compound selected from the group consisting of ethers, alcohols, aldehydes, amides and formic acid. The invention also relates to the intermediate depolymerized heparin obtained by the process. The intermediate depolymerized heparin can be dissolved in a buffer solution and fractionated by gel permeation for obtaining the desired molecular weight.
摘要:
The invention relates to a process for the depolymerization of glycosaminoglycanes characterized by the use of UVC radiation. The invention also relates to the intermediate depolymerized heparin obtained by the process. The intermediate depolymerized heparin can be dissolved in a buffer solution and fractionated by gel permeation for obtaining the desired molecular weight.
摘要:
The invention concerns a method for functionalizing polysaccharides using a source or free radicals which forms stable radicals on the polysaccharides structure and wherein the formed radicals reacts with a functionalized unsaturated compound, characterized in that the method comprises two steps: a first step, wherein the free radical on the polysaccharide chain is formed, and a second step, wherein said radical reacts with the unsaturated compound in the absence of the radical source. The invention also relates to the functionalized polysaccharide obtained by this process.
摘要:
The present invention is directed to sulfated oligosaccharides having 4, 5 or 6 saccharidic units and wherein a glycosidic bond between two saccharide units is substituted by a C—C bond, and wherein the sulfation degree expressed as percentage of OH groups substituted by a OSO3− group is comprised between 50 and 100%. The sulfated oligosaccharides according to the invention are useful as a drug, in particular in the treatment of angiogenesis, metastasis, and inflammation.
摘要:
The present invention is directed to a multistep process for the physical depolymerization of heparin wherein heparin is subjected to at least two γ-ray irradiations and wherein between two irradiation steps the depolymerised heparin is subjected to a separation step and only a fraction of the depolymerised heparin obtained from the first irradiation is subjected to the second irradiation step. It is also directed to heparin-derived oligosaccharide fractions obtainable by the process of the invention.