1095 results about "Thiol group" patented technology

Methods for efficient preparation of drug-polymer (or oligomer) conjugates which are useful in the preparation of particles, including microparticles and nanoparticles, for delivery of the drug in vivo for therapeutic applications. The invention additionally provides certain drug-polymer and drug-oligomer conjugates which are useful in the preparation of particles for delivery of the drug in vivo. The invention also provides nanoparticles of this invention prepared by nanoprecipitation using drug-polymer/oligomer conjugates of the invention.

The drug conjugates are formed during polymerization of the polymer or oligomer in which the drug is employed as an initiator of the polymerization of the monomers which form the polymer and/or oligomer. More specifically, the drug conjugates are formed by ring-opening polymerization of cyclic monomers in the presence of an appropriate ring-opening polymerization catalyst and the initiator (the drug). The method is particularly useful for formation of polymer/oligomer conjugates with drugs and other chemical species containing one or more hydroxyl groups or thiol groups.

The invention provide a new class of silicone-containing prepolymers containing poly(oxyalkylene) blocks, polysiloxane blocks, and actinically-crosslinkable groups which are acryl groups, thiol groups, ene-containing groups or combinations thereof. A preopolymr of the invention is prepared in a one-pot procedure according to the Micahel addition of thiol to electron deficient alkenes, such as α,β-unsaturated carbonyl compounds, without need for additional reaction step(s) to introduce actinically crosslinkable groups. The present invention is also related to silicone hydrogel contact lenses made from this class of silicone-containing prepolymers and to methods for making the silicone hydrogel contact lenses.

The compound represented by the general formula (I):

• • wherein, a fused ring AB represents a 5- to 10-membered fused heterocyclic ring; R¹ represents (1) a hydrogen atom, (2) a halogen atom, (3) a cyano group, (4) an oxo group, (5) an optionally protected hydroxyl group, (6) an optionally protected carboxyl group, (7) an optionally protected amino group, (8) a cyclic group which may have a substituent (s), (9) an aliphatic hydrocarbon group which may have a substituent (s), or (10) an optionally protected thiol group; n represents 0 or an integer of 1 to 8; provided that n represents an integer of not less than 2, plural R¹ are the same or different; a salt thereof, a solvate thereof or a prodrug thereof has a kinase (especially c-Jun N-terminal kinase) inhibitory activity and an inhibitory activity of a function of AP-1 as a transcription factor, it is useful as a preventive and/or therapeutic agent for a for example, a diabetes of metabolic disease, etc., a rheumatoid arthritis of inflammatory, etc.

A one component resin composition curable with a combination of light and heat, which comprises (1) an epoxy resin, (2) an acrylic ester monomer and/or methacrylic ester monomer, or an oligomer thereof, (3) a latent epoxy curing agent, (4) a photo radical initiator, and (5) a compound having two or more thiol groups per molecule, wherein the ingredient (5) is contained in an amount of 0.001 to 5.0 parts by weight per 100 parts by weight of this resin composition. According to the present invention, a one component resin composition curable with a combination of light and heat, which has excellent curability especially in a light-shielded area can be provided. Also, a liquid crystal sealant composition curable with a combination of light and heat, which is applicable to the one-drop-fill method and has excellent curability in light-shielded areas and adhesion reliability, especially high-temperature and high-humidity adhesion reliability, can be provided.

Methods and apparatus for evanescent light fluoroimmunoassays are disclosed. The apparatus employs a planar waveguide with an integral semicylindrical lens, and has multi-analyte features and calibration features, along with improved evanescent field intensity. A preferred embodiment of the biosensor and assay method has patches of capture molecules, each specific for a different analyte disposed adjacently within a single reservoir. The capture molecules are immobilized to the patches on the waveguide surface by site-specific coupling of thiol groups on the capture molecules to photo-affinity crosslinkers, which in turn are coupled to the waveguide surface or to a nonspecific binding-resistant coating on the surface. The patches of different antibodies are produced by selectively irradiating a portion of the waveguide surface during the process of coupling the photo-affinity crosslinkers, the selective irradiation involving a mask, a laser light source, or the like.

Magnetic nanoparticles are provided that have a superparamagnetic core and a nanoporous silica shell surrounding the core. The shell is functionalized with amine or S-nitrosothiol groups both inside and outside the nanopores. A process to provide such nanoparticles involves hydrolyzing tetraethoxysilane (TEOS) in a microemulsion of a superparamagnetic nanoparticle to form a superparamagnetic nanoparticle encapsulated by an incompletely hydrolyzed nanoporous silica shell, and hydrolyzing an amine-containing compound or a thiol-containing compound in situ in the presence of the incompletely hydrolyzed nanoporous silica shell before hydrolysis and densification of the silica shell is complete to functionalize the nanoporous silica shell with amine or thiol groups both inside and outside the nanopores and to maintain nanoporosity of the shell. Such magnetic nanoparticles are useful as carriers for chemical or biological species, particularly for magnetic resonance imaging, optical imaging, targeted drug delivery, cell delivery and magnetic separation applications.

The invention provides a liquid crystal aligning agent and a compound, wherein the liquid crystal aligning agent can provide a crystal aligning film which can maintain the mixing effect of a cross-linking agent and have good uniform performance and have good stability and printing performance as a compound. The liquid crystal aligning agent is characterized in that the liquid crystal aligning agent has (A) at least one group of (Alpha1)free carboxyl, oxygen heterocyclic propyl, oxygen heterocyclic butyl, hydroxyl, thiol group, amino group and (meth) acrylic acid base, and (Alpha2) at least one imide ring, and a compound with below 1000 molecular weight; and (B) polymers.

The present invention relates to compounds of the Formula (I), wherein X₁ and X₂ independently represent O, NH or S; R₁ and R₂ are independently selected from the group consisting of a C1-C30 hydrocarbyl group, an amino acid bonded via an amide bond or a peptide bonded via an amide bond each having up to 200 amino acids, the conjugated residue X₁ or X₂ in this case being NH, and hydrogen, both radicals R₁ and R₂ preferably not being H; and R₃ is a residue selected from group consisting of —S—R₆, wherein R₆ is a C1-C30 hydrocarbyl group, at least one of R₁ and R₂ not being H when X₁ and X₂ are oxygen, —S—CH₂—CH(NH₂)(COOH) (cysteine-S-yl), a homologue or derivative (e.g. N-acetyl cysteine-S-yl) thereof, a peptide having up to 200 amino acids which contains at least one amino acid radical with a thiol group, preferably a cysteine radical, and is bonded via the thio sulfur, preferably via the cysteine sulfur (peptide-S-yl), coenzyme A which is bonded via a thiol group or fragments thereof, acyl carrier protein bonded via a thiol group, and dihydrolipoic acid bonded via a thiol group; and pharmaceutically acceptable salts thereof. The present invention also relates to the use of these compounds for preparing a drug, drugs containing the same and their use for the therapy of diseases such as autoimmune disease, NF-kappaB mediated diseases, psoriasis, psoriatic arthritis, neurodermitis, enteris regionalis Crohn, cardiac insufficiency, chronic obstructive pulmonary diseases and asthma and in transplantation medicine.

This invention relates generally to cyclic polypeptides comprising a thioether linkage and methods for their preparation. More particularly, this invention relates to halogenated polypeptides having at least one haloalanine-like amino acid, and methods for their preparation which involve converting the hydroxyl group (i.e., -OH) of a serine-like amino acid to a halo group (i.e., -X where X is Cl, Br, or I) with the aid of a phosphorus-based halogenation reagent such as a triphenylphosphine dihalide (i.e., (C6H5)3PX2, wherein X is Cl, Br, or I), a triphenylphosphite dihalide (i.e., (C6H5O)3PX2, wherein X is Cl, Br, or I), or a mixture of triphenylphosphine or triphenylphosphite with a halohydrocarbon (i.e., "halo-conversion"). This invention also relates to cyclic polypeptides having at least one polypeptide loop comprising a thioether linkage, and methods for their preparation which employ halogenated polypeptides and which involve intramolecular alkylation of the thiol group of a cysteine-like amino acid by the halo group of a haloalanine-like amino acid under suitable basic conditions to form a thioether linkage (i.e., "cyclization").

PURPOSE: To easily obtain the titled alcohol wherein one of both terminals is quantitatively capped, at a low cost, by polymerizing THF in the presence of an active hydrogen-containing compound using a Lewis acid and a cyclic ether as polymerization initiators. CONSTITUTION: A polyether monoalcohol is produced by polymerizing tetrahydrofuran in the presence of a compound containing one active hydrogen atom in one molecule using a Lewis acid and a 3-4-membered cyclic ether. The active hydrogen-containing compound is a compound having hydroxyl group, carboxyl group or thiol group, e.g. methanol, cyclohexanol, etc., and the ether is selected from epoxides or oxetanes.

An electrophotographic photoreceptor of the present invention comprises a conductive support and a photosensitive layer. The photosensitive layer on the farthest side from the conductive support, includes a phenol derivative-containing layer which contains a phenol derivative having a methylol group and a charge transport material having at least one selected from the group consisting of a hydroxyl group, a carboxyl group, an alkoxysilyl group, an epoxy group, a thiol group and an amino group. An infrared absorption spectrum of the phenol derivative-containing layer satisfies the conditions represented by the following formula (1):

(P₂/P₁)≦0.2  (1)

P₁ is an absorbance of a maximum absorption peak in a range of 1560 cm⁻¹ to 1640 cm⁻¹, and P₂ is an absorbance of a maximum absorption peak in a range of 1645 cm⁻¹ to 1700 cm⁻¹.

Biomaterials containing a three-dimensional polymeric network formed from the reaction of a composition containing at least a first synthetic precursor molecule having n nucleophilic groups and a second precursor molecule having m electrophilic groups wherein the sum of n+m is at least five and wherein the sum of the weights of the first and second precursor molecules is in a range from about 8 to about 16% b weight of the composition, preferably from about 10 to about 15%, more preferably from about 12 to about 14.5% by weight of the composition. In one embodiment, the first and second precursor molecules are polyethylene glycols functionalized with nucleophilic and electrophilic groups, respectively. In a preferred embodiment, the nucleophilic groups are amino and/or thiol groups and the electrophilic groups are conjugated, unsaturated groups. The ratio of the equivalent weights of the electrophilic groups (second precursor molecule) and the nucleophilic groups (first precursor molecule) is in the range of between 0.7 and 1.1, more preferably between 0.8 and 1.0. The first and/or second precursor molecule may be covalently bound to one or more molecules selected from the group consisting of cell adhesion peptides, growth factors, and growth factor-like peptides.

The present invention relates to a method of preparing a carbon nanotube-quantum dot conjugate having a high density of quantum dots (QDs) on its surface. This method involves providing a plurality of semiconductor quantum dots and providing a thiol-functionalized carbon nanotube having a plurality of terminal thiol groups on its surface. The plurality of semiconductor quantum dots are attached to the surface of the carbon nanotube under conditions effective to yield a carbon nanotube-quantum dot conjugate having a high density of quantum dots on its surface. The present invention also relates to a carbon nanotube-quantum dot conjugate having a high density of quantum dots on its surface. The present invention further relates to a photodetector device. This device includes a substrate and a nanocomposite layer. The nanocomposite layer includes a plurality of the carbon nanotube-quantum dot conjugates previously described.

This invention relates to a negative-working photosensitive resin composition that can be developed in an alkaline developer. This photosensitive resin composition comprises: (a) a polyimide having at least one group selected from the group consisting of a carboxyl group, a phenolic hydroxyl group, a sulfonic acid group, and a thiol group at the terminus of the polymer main chain; (b) a compound having a polymerizable functional group comprising unsaturated double and/or triple bonds; and (c) a photopolymerization initiator.

Methods for introducing fluorine atom onto a polypeptide are provided. Also provided are linkers, bioconjugates, and bifunctional compound agents made using the methods, linkers, and bioconjugates. The methods comprise: (i) providing a linker comprising a thiol-reactive terminus and an aldehyde-reactive terminus; (ii) reacting the thiol-reactive terminus of the linker with a polypeptide comprising at least one thiol group or a reactive derivative thereof; and (iii) subsequently reacting the aldehyde-reactive terminus of the linker with a fluorine-substituted aldehyde.

Size-controlled immobilization of metal nano-clusters onto particles or nanoparticles is achieved using a polyol process. Polyol processing makes it possible to use thiol groups as a chemical protocol to functionalize the surface of particles, such as silica and polystyrene nanoparticles. Metal nano-clusters, such as silver, gold, platinum and palladium, nucleate and grow on the surface of the particles. The metal nano-clusters may be synthesized in a one-pot process from metal salts, nitrates, nitrites, sulfates, sulfites and the like. Any source of metal ions compatible with the polyol suspension and selected particles may be used. The size of immobilized metal nano-clusters may be controlled by additions of a poly(vinylpyrrolidone) or other polymer capable of regulating the metal ion reduction and nucleation process and by controlling concentration of metal ions, the nucleation and/or growth temperatures, and processing time.