摘要:
Disclosed is a method for the rapid quantitative determination of low density lipoprotein (LDL) in a biological fluid sample containing LDL, very low density lipoprotein (VLDL) and high density lipoprotein (HDL). The sample is first passed through a matrix to bind LDL to the matrix. The LDL is then eluted from the matrix differentially from VLDL and HDL. A parameter representative of the concentration of a solute exiting the matrix during the interval when LDL is eluted is then determined, wherein the parameter is proportional to the amount of the LDL in the sample. The parameter may be determined, e.g., by electronically integrating under a spectrophotometrically detected peak of eluted LDL.
摘要:
A method of derivatizing a chromatography matrix having a hydrophobic surface involves reacting the hydrophobic surface with a halosulfonating agent to produce a significant amount of halosulfone groups covalently bonded onto the surface. Sulfonamide bonds then are formed between these halosulfone groups and a group of amine functions on a polyaminated polymer to produce a pellicular anion exchange layer covalently bonded to the surface. The resulting layer is stable in the absence of cross-links between the molecules of the polyaminated polymer.
摘要:
The invention features a method of detecting a trace solute in a solution which contains a major amount of a dissolved product, the method including the steps of: flowing the solution through means for extracting the product to produce an effluent flow substantially free of product containing the trace solute; flowing the effluent through a trace solute adsorbing means to progressively accumulate therein the trace solute; and eluding the trace solute from the adsorber to produce an eluant fraction containing a detectable quantity of the trace solute.
摘要:
A method is disclosed for preparing novel purine PNA synthons having protecting groups which may be removed under mild conditions. The purine PNA synthons generally are prepared by coupling purine derivatives having carbamate protection to a protected N-(2-aminoethyl)-glycine backbone. By a method of this invention, purine PNA synthons may have orthogonal protection of the carbamate protected purine and the protected backbone. The purine PNA synthons are useful in the synthesis of peptide nucleic acids (PNAs) and other oligomers such as PNA-DNA chimeras, and may be used in automated synthesizers. In practicing methods of the invention, novel compositions of matter also are disclosed. For example, disclosed herein are an adenine PNA synthon having the following formula: ##STR1## and a guanine PNA synthon having the following formula: ##STR2##
摘要:
A method is disclosed for the preparation of novel PNA synthons compatible with DNA synthetic reagents and instrumentation. Accordingly, the PNA synthons of this invention are particularly suitable for the preparation of PNA-DNA chimeras, among other oligomers. The PNA synthons are designed to have a protecting group strategy which is orthogonal and allows removal of the protecting groups under mild conditions. Generally, an acid labile protected backbone is coupled to a nucleobase side chain moiety to form the PNA synthon. A novel method for synthesizing the acid labile protected backbone also is described. In addition, novel compositions of matter are disclosed.
摘要:
The invention relates to methods for determining sequence information in polynucleotides by combining the recent disparate technologies of mass spectrometry and polynucleotide hybridization, amplification, extension and/or ligation techniques. Broadly, in a first step, the method for determining sequence information in a sample polynucleotide includes hybridizing with a sample nucleotide one or a mixture of oligonucleotide probes having a nucleotide sequence complementary to a portion of the sample polynucleotide, thereby forming a complex. Then, in a second step, the complex is contacted with at least a member selected from the group consisting of nucleosides, dideoxynucleosides, polymerases, nucleases, transcriptases, ligases and restriction enzymes to alter at least a subset of said oligonucleotide probes. In a third step, the method provides for determining the molecular weight of at least the subset of altered probes by mass spectrometry and infering the sequence information of the sample polynucleotide therefrom.
摘要:
A method for removing an allyl protecting group from an allyl-protected derivative of a biologically relevant amino acid is disclosed. One relevant aspect of the method is the use of soluble organometallic catalyst, such as an organopalladium catalyst. Preferably, soluble tetrakistriphenylphosphine palladium (0) is used. The allyl deprotection method now disclosed is suitable for use on an instrument for automated peptide synthesis. Methods of preparing the soluble organometallic catalyst are also disclosed, as are soluble catalyst compositions.
摘要:
Disclosed is an apparatus for fluidic separation systems comprising a microfabricated conduit including a usefully long optical pathlength. The provision of a usefully long optical pathlength in the apparatus greatly improves the sensitivity of detection of separated analytes without compromising the resolving power of the apparatus.
摘要:
Disclosed are chemically-produced specific binding, "molecular imaged" sorbents which reversibly bind a preselected macromolecule by spatially matched multipoint interactions between functional groups synthesized on the surface of the sorbent and functional groups on the surface of the macromolecule. Also disclosed are methods of producing such sorbents. The sorbents typically are high surface area solids comprising surface binding regions which have charged groups, metal coordinating groups, hydrophobic moieties, or various combination thereof anchored thereto and spaced in the mirror image of complementary interactive groups on a surface of the macromolecule.
摘要:
Compositions, methods, and apparatus for performing ultrafast binding assays by capillary electrophoresis or other electroseparation techniques are disclosed. In one embodiment, a first binding partner carries a detectable label and a second binding partner is modified to be highly charged. When used in combination with a sample containing an analyte with which both binding partners can interact and bind thereto, a three-membered complex is formed. The electrophoretic mobility difference between the unbound and complex-bound forms of labeled first binding partner is such that electroseparation and subsequent detection of an analyte can be accomplished. The compositions, methods, and apparatus disclosed herein also permit quantitative determination of the concentration of an analyte in a sample.