摘要:
The present invention relates to fluorinated biopolymer and polymer derivatives useful as imaging probes, diagnostic agents and contrast agents and to imaging methods employing the fluorinated biopolymers and polymers.
摘要:
Macrocolloids of polyhydroxyalkanoates are used as fat substitutes. Polyhydroxybutyrate is the preferred homopolymer. The polymeric particles can have a particle size of from 0.1-10 microns.
摘要:
Functionalized poly(hydroxyalkanoate) derivatives having the general structural formula: ##STR1## wherein Y is hydrogen, a saccharide moiety or an alkenyl moiety having a molecular weight in the range of from about 25 to about 100,000; R.sub.1, R.sub.2 and R.sub.3 are, independently, hydrogen, an aromatic moiety, an alkyl moiety or an alkenyl moiety, said alkyl moiety or alkenyl moiety including from one to about nine carbon atoms; A is carbonyl or methylene; X is oxygen or imino (--NH); Z is selected from the group consisting of hydrogen, a saccharide moiety, an alkyl moiety and an alkenyl moiety having a molecular weight in the range of from about 25 to about 100,000, with the proviso that if Y is hydrogen, Z is not hydrogen; r.sub.1, r.sub.2 and r.sub.3 are, independently, a numeral 1, 2 or 3; m and n are, independently, a numeral in the range of from one to about 5; and q is a numeral in the range of from about 5 to about 10,000, and a novel method of manufacturing the functionalized poly(hydroxyalkanoate) derivatives, are disclosed.
摘要:
New Amines and amides of carboxylated polysaccharides having the nitrogen of the amido and amino groups directly attached to the polysaccharides and method of making same, based on reacting in solution a material having carboxyl-containing polysaccharides, such as carboxymethyl cellulose, with ammonium donors having the general formula >NH such as primary and secondary amine reagents and with or without a reducing agent to obtain amides or amines. These products may be used for instance in biological separations, for the immobilization of proteins, for the removal of metal ions, a thickeners, and as suspension agents.
摘要:
A process for preparing n-amino-n-deoxy cellulose where n is 2 or 3 and has the same value at each occurrence in one molecule. When n is 2 cellulose is selectively oxidized by (a) reacting it with triphenylmethyl chloride; then (b) reacting the product from (a) with acetic anhydride and dimethylsulfoxide. The product from (b) is then subjected to reductive amination. When n is 3 cellulose is reacted with dimethylsulfoxide and paraformaldehyde. The product from (a) is then reacted with acetic anhydride and dimethylsulfoxide and the product from (b) then subjected to reductive amination.
摘要:
The present invention relates to fluorinated biopolymer and polymer derivatives useful as imaging probes, diagnostic agents and contrast agents and to imaging methods employing the fluorinated biopolymers and polymers.
摘要:
New amines and amides of carboxylated polysaccharides having the nitrogen of the amido and amino groups directly attached to the polysaccharides and method of making same, based on reacting in solution a material having carboxyl-containing polysaccharides, such as carboxymethyl cellulose, with ammonium donors having the general formula >NH such as primary and secondary amine reagents and with or without a reducing agent to obtain amides or amines. These products may be used for instance in biological separations, for the immobilization of proteins, for the removal of metal ions, as thickeners, and as suspension agents.
摘要:
A product comprising lignin material having a N-content of at least 1.86% and a sulfur content of at least 3.1%, an IR in the vicinity of 1550 to 1670 cm.sup.-1 having a peak width of at least 60 cm.sup.-1. The product is also directed to such products being cross-linked and which are most suitable as chelating agents in basic medium. The product may also be used as flame retardant, for agricultural and other end uses. The invention is also directed at a method of making the above product which comprises heating a lignin containing material with thiourea H.sub.2 N--C(S)--NH.sub.2 : for example by heating in a solvent or melting.
摘要:
A process for preparing an amino deoxy derivative of a polysaccharide. The process comprises oxidizing the polysaccharide with dimethyl sulfoxide in combination with acetic anhydride or acetic anhydride with paraformaldehyde in a first step. The product from the first step is subjected to reductive amination.
摘要:
The present invention relates to fluorinated and paramagnetic polyuronides (Formulas I–IV) and proteins useful as imaging probes, diagnostic agents and contrast agents. Additionally, the present invention relates to imaging methods employing the present compounds of Formulas I–IV.