699 results about "Fluorophore" patented technology

To provide a method for detecting the presence of multiple specific nucleic acid sequences or single nucleotide polymorphisms in a temperature-dependent fashion.SOLUTION: Provided is a method, in which an invasive oligonucleotide and a primary probe oligo (a 5' flap oligonucleotide) hybridize to a target strand nucleic acid to form an invasive cleavage structure cleavable by a FEN-1 endonuclease to release a cleaved 5' flap (primary cleaved flap); in a secondary reaction, the primary cleaved flap from the primary reaction hybridizes to a FRET cassette 1, a hairpin oligonucleotide labeled with a fluorescent dye and a quencher molecule, to form a second invasive cleavage structure that is cleavable by a FEN-1 endonuclease at a site between the fluorophore and a quencher; and cleavage of FRET cassette 1 separates the quencher from the fluorophore, such that fluorescence signal from the fluorophore can be detected.SELECTED DRAWING: Figure 1

Aspects of the present disclosure include methods for spectrally resolving light from fluorophores in a sample. Methods according to certain embodiments include detecting light with a light detection system from a sample having a plurality of fluorophores having overlapping fluorescence spectra and spectrally resolving light from each fluorophore in the sample with a generalized least squares algorithm. In some embodiments, methods include estimating the abundance of one or more of the fluorophores in the sample, such as on a particle. In certain instances, methods include identifying the particle in the sample based on the abundance of each fluorophore and sorting the particle. Methods according to some embodiments includes spectrally resolving the light from each fluorophore by calculating a spectral unmixing matrix for the fluorescence spectra of each fluorophore. Systems and integrated circuit devices (e.g., a field programmable gate array) for practicing the subject methods are also provided.

The invention is based, at least in part, on the discovery that replacement of a key bond in the near-infrared fluorophore with a carbon-carbon bond conjugation to a targeting ligand results in vastly increased stability as compared to NIR fluorophores without such a bond, while preserving ligand and zwitterionic properties. In at least one aspect, the invention provides an imaging agent dye comprising a charge-balanced imaging agent conjugated to a targeting vector, wherein the targeting vector is a PSMA binding vector, such as dPSMA-617 or KUE, a FAP binding vector, a bombesin receptor binding vector, or a somatostatin receptor binding vector, and the charge-balanced imaging agent is ZW-800-1, ZW-830-1, or ZW-700-1-Forte.

The present discloses systems and methods for tissue analysis, biopsy, and treatment utilizing at least exogenous fluorophores and near infrared light. A method is disclosed for optically determining the presence of abnormal cells, such as cancer, in tissue. The method includes applying one or more exogenous fluorophores into tissue in an animal body, wherein the exogenous fluorophores include a targeting moiety formulated to bond with a selected site on abnormal cells. The method includes illuminating the one or more exogenous fluorophores in the tissue with near infrared light from an elongated optical probe to generate fluorescent light from exogenous fluorophores present in the tissue. The method includes receiving fluorescent light generated from the one or more exogenous fluorophores in the tissue. The method includes determining if abnormal cells are present in the tissue based on the fluorescent light generated from the one or more exogenous fluorophores in the tissue.

The present disclosure relates in some aspects to methods, systems, and kits for sequencing a template nucleic acid molecule using nucleotide-fluorophore complexes. In some embodiments, each nucleotide-fluorophore complex comprises: (i) a single nucleotide attached to a core; and (ii) a plurality of fluorophores attached to the core; wherein each nucleotide-fluorophore complex comprises no more than one nucleotide. In some embodiments, the methods provided herein achieve improved signal intensity and sensitivity.

The invention discloses a near-infrared two-region activatable probe as well as a preparation method and application thereof. The near-infrared second-region activatable probe comprises a near-infrared second-region fluorescent light-emitting unit and an analyte specific response unit; the near-infrared second-region light-emitting unit comprises a hemicyanine fluorophore structure; when the analyte specific response unit is chemically coupled with the near-infrared second-region light-emitting unit, the intramolecular charge transfer process of the light-emitting unit can be inhibited, and fluorescence quenching is caused; the analyte specific response unit is separated from the light-emitting unit after being subjected to specific reaction with an analyte, so that fluorescence is activated. The near-infrared two-region hemicyanine fluorophore selected by the near-infrared two-region activatable probe has higher fluorescence quantum efficiency, and the near-infrared two-region probe which can be activated by a specific analyte and has a high on-off ratio can be constructed by introducing an analyte specific response unit, so that high-temporal-spatial-resolution fluorescence detection of deep tissues can be realized; the method has a wide application prospect in the field of biomedical detection.

Systems and methods for calibrating an imager for unmixing of images with multiple fluorophores is described. One example method performed by a computing device includes receiving one or more single-color control images, a foreground channel, and a background channel. The single-color control images are images of the sample with a single fluorophore applied to the sample, and the foreground channel and the background channel are associated with the fluorophore. The method includes determining a difference between the foreground channel and the background channel, acquiring a foreground pixel mask from the difference, averaging a set of foreground pixels in the foreground pixel mask to generate a first spectrum, and subtracting an unstained spectrum from the first spectrum to generate a second spectrum. The second spectrum defines a spectral profile of the sample. A calibration slide and a method of preparing a calibration slide are also described.

The invention relates to a coumarin-based fluorescent probe as well as a preparation method and application thereof in the aspect of HClO detection, and belongs to the technical field of HClO detection. The invention discloses a coumarin-based fluorescent probe W (O-(3-((2-morpholinyl ethyl) carbamoyl)-2-oxo-2hydrogen-benzopyran-7-yl) dimethyl thiocarbamate) prepared on the basis of an intramolecular charge transfer (ICT) mechanism, and a preparation method of the coumarin-based fluorescent probe W. The novel lysosome targeting fluorescent probe contains coumarin as a fluorophore, a morpholine group as a targeting group and a dimethyl thiocarbamate group as a recognition group, is a novel lysosome targeting fluorescent probe, and has excellent performances of high selectivity, low detection limit, low cytotoxicity, high resolution and the like in the aspect of HClO detection; the method can be used for detecting the content of endogenous and exogenous hypochlorous acid in living cells.

A method for automatically ascertaining illumination brightnesses to be adjusted of at least two light sources for exciting at least one respective fluorophore in a sample to be imaged in a fluorescence microscope includes separately controlling, in terms of illumination brightness, each of the at least two light sources, detecting an image intensity of a microscopically imaged sample with at least two detectors, and automatically ascertaining the illumination brightnesses to be adjusted of the at least two light sources in such a way that a predefined setpoint of a signal-to-noise ratio is reached for each fluorophore. In order to ascertain the illumination brightnesses of the at least two light sources, cross-talk of a detector for different emission spectra of the fluorophores and / or cross-excitation of a fluorophore for different illumination spectra of the light sources are / is taken into account.

The invention relates to the technical field of organic synthesis and the technical field of fluorescent materials, in particular to a boron coordination salicylhydrazone double-state emission fluorophore as well as a preparation method and application of the boron coordination salicylhydrazone double-state emission fluorophore. The structure of the boron coordination salicylazone double-state emission fluorophore is shown as I, II or III; wherein R1 is selected from one of H, halogen atoms, diethylamino and thienyl, R2 is selected from one of H, halogen atoms, diethylamino and thienyl, and R3 is selected from one of aryl, 9, 9 '-spirobifluorenyl, alkoxy and halogen atoms. The boron coordination salicylazone double-state emission fluorophore is diversified in structure and good in solubility, has excellent photophysical properties and extremely high quantum yield, and also shows excellent biocompatibility and remarkable liposome targeting property at the same time. Moreover, the preparation method of the boron-coordinated salicylazone double-state emission fluorophore adopts a one-pot two-step method, is simple and convenient, is high in yield, is green and environment-friendly, and has a wide application prospect.

The present invention relates to a method for determining the efficiency of RNA encapsulation in lipid nanoparticles (LNPs). In some embodiments, a method according to the invention comprises the steps of a) contacting a sample comprising RNA encapsulated in LNP with a first fluorophore and a second fluorophore, thereby forming a fluorophore-RNA complex, and b) detecting a fluorescence signal of the complexed first and second fluorophore, wherein the first fluorophore permeates the LNPs and wherein the second fluorophore does not permeate the LNPs.

The invention belongs to the technical field of analysis and detection, and particularly relates to a beta-galactosidase response type hemicyanine near-infrared fluorescent probe, a preparation method thereof and application of the beta-galactosidase response type hemicyanine near-infrared fluorescent probe as a tumor organ imaging probe. The near-infrared fluorescent probe provided by the invention takes a water-soluble hemicyanine skeleton as a fluorophore, so that the biocompatibility of the near-infrared fluorescent probe is improved; based on the principle that beta-galactose can be selectively cut by beta-galactosidase, a galactose structure with a self-leaving group is used as a response group, selective quick response to the beta-galactosidase is achieved, and high sensitivity to the beta-galactosidase is shown. The near-infrared fluorescent probe provided by the invention can emit near-infrared fluorescence with long wavelength, has lower background fluorescence and good penetration depth, and can be directly used for detecting organoids containing the matrigel without eliminating the matrigel, so that the organoids are prevented from being damaged or additional experimental variables are prevented from being introduced in the process of eliminating the matrigel.

The invention provides a multi-focus excitation confocal fluorescence microscopic imaging flow cytometry screening method. The method is characterized in that a laser beam generates three laser beams through a spatial light modulator, and the three laser beams are coherently superposed in a focal plane of a microscope objective to generate a two-dimensional optical lattice light field. And after the other laser beam is shaped by the cylindrical lens, linear laser optical tweezers are realized through the microscope objective, cells to be detected in an imaging detection area of the micro-flow chip are captured, and accurate active optical control on the rotation angle of the cells to be detected is realized. In a cell rotation process, a two-dimensional optical lattice light field rapidly scans in a focal plane at different angles, and a fluorophore in the cell is excited to generate a fluorescence signal. The confocal pinhole array installed at the position conjugate with the focal plane eliminates background fluorescence, a high-spatial-resolution fluorescence image of a three-dimensional structure in the cell is obtained, and cell screening is achieved. The method provided by the invention has the characteristics of high detection rate, high accuracy and the like, and has wide application prospects in the research fields of biology, medicine and life science.

The invention discloses a compound, a kit and application thereof, and relates to the technical field of biomedicine. The compound comprises an electron acceptor aromatic unit, an optional electron donor aromatic unit and a shielding unit, and the shielding unit shields intermolecular interaction of the electron acceptor aromatic unit and / or the electron donor aromatic unit. Wherein the electron acceptor aromatic unit, the electron donor aromatic unit and the shielding unit are connected through covalent bonds. The compound can be used as a molecular near-infrared-II fluorophore, and has higher quantum yield and good biocompatibility. The compounds emit fluorescence in the range of 900-1400 nanometers, the intermolecular and intramolecular interaction of the conjugated skeleton is weakened, and the quantum yield is improved. The high quantum yield, biocompatibility and near-infrared II emission of the compound provide opportunities for in-vivo application of near-infrared II imaging by using molecular fluorophores.

The invention discloses a fluorescent probe as well as a preparation method and application thereof. The invention provides a series of fluorescent probes with novel structures, and the fluorescent probes take 2-(isoquinoline-1-yl) pyrrole boron difluoride as fluorophores, so that the fluorescence quantum yield of the probes is improved, the detection resolution of nitric oxide is increased, and the detection sensitivity is improved. The fluorescent probe disclosed by the invention has the characteristics of large Stokes displacement, high fluorescence quantum yield, good selectivity and short response time.

The invention belongs to the field of fluorescent compound synthesis, and particularly relates to a terpyridyl fluorescent compound and application. The terpyridyl fluorescent compound is named as (E)-4-(5-((3, 2 ': 6', 3 '-tripyridyl)-4'-yl) styryl) thiophene-2-yl) morpholine in Chinese, the structural formula is # imgabs0, terpyridyl serves as a fluorophore, thiophene serves as a reaction site, morpholine is introduced to serve as an electron withdrawing group, a push-pull result is formed in a molecular structure, the reaction sensitivity is improved, and the fluorescent compound can be applied to the field of fluorescence detection. The Fe < 3 + > is coordinated with the empty orbital of the thiophenic sulfur element, so that the energy distribution of the probe is changed, the fluorescence intensity of the probe is changed, and finally the purpose of identifying the iron ions is achieved. Therefore, the invention also provides application of the terpyridyl fluorescent compound as a fluorescent probe in detection of Fe < 3 + >.

Provided is a method for controlling the quality of an alcoholic beverage, the method comprising: (1) a step for preparing a plurality of probe solutions having different probes, ion intensities, or pH, the probes containing (a) a cationic polymer and (b) an environment-responsive fluorophore, the fluorophore being covalently bonded to a part of the primary amino group in the cationic polymer; (2) a step for mixing the plurality of probe solutions and an analysis sample that contains an alcoholic beverage; (3) a step for measuring the fluorescence intensity of the mixed liquid prepared in step (2); and (4) a step for comparing the fluorescence intensity pattern obtained in step (3) with a fluorescence intensity pattern obtained from a reference sample.

A method for detecting, quantifying and / or visualizing endogenous fluorophores, such as melanin, in a biological tissue, the method comprising: acquiring a plurality of two-dimensional (2D) multiphoton images of fluorescence intensity, or combined multiphoton FLIM images, each image being acquired in a plane substantially perpendicular to a surface of the biological tissue, the image is processed to detect boundaries of the surface of the biological tissue and to detect endogenous fluorophores, and information representative of a distribution of endogenous fluorophores in the biological tissue relative to the boundaries is generated based on the processed image, in particular as a function of the distance from the boundaries.

A method of analyzing a mixed fluorescence response of a plurality of fluorophores in a microscopic sample includes reconstructing individual fluorescence responses from a mixed fluorescence response using spectral un-mixing based on reference emission spectra for fluorophores to be reconstructed, and a procedure for determining and validating reference emission spectra including providing a plurality of image acquisition settings for a sequence of images of the sample equal to, or greater than, the plurality of fluorophores and including an illumination setting for each image, acquiring the sequence of images using the plurality of image acquisition settings and storing each image together with the corresponding illumination setting, determining candidate reference emission spectra for the fluorophores to be reconstructed from the sequence of images of the sample using one or more reference emission spectra determination algorithms, and conditionally using the candidate reference emission spectra as the reference emission spectra in the spectral un-mixing.

Devices, systems, and methods are provided for in vivo fluorescence imaging. Disclosed herein is an implantable miniature fluorescence imager on a chip having a custom imaging array with angle selective gratings, fiber optics, or microcollimators for image deblurring, and optical filters that can be tuned to image fluorescence from multiple fluorophores simultaneously. Power is supplied by an on-chip power source or transmitted to the chip from an external transducer such as an ultrasound transducer, electromagnetic transducer, inductive transducer, or radiofrequency transducer. Wireless communication may be provided by electromagnetic or ultrasound links to the device. The function of a fluorescence microscope is provided in a millimeter-scale device that can be readily implanted in tissue and used to image fluorescently labeled cells in vivo. The small size of the fluorescence imager makes possible sustained in vivo imaging with real-time monitoring of multiple cell types within Shifting the dynamic diseased tissue or a tumor.

The present invention relates to nanoparticles capable of charge conversion and medical use thereof. More specifically, provided are: nanoparticles formed by self-assembling a compound in which a photosensitizer is encapsulated in a cyclodextrin derivative conjugated with a zwitterionic near-infrared fluorophore; and a photodynamic or photodynamic / chemotherapeutic composition thereof for diagnosing or treating cancer, thereby enhancing anticancer efficacy through synergistic effects thereof.

Systems, including methods and compositions, for performing multiplexed assays. The methods may include (A) providing a mixture including (i) a sample having one or more of a plurality of distinct nucleic acid targets, (ii) amplification reagents sufficient for amplification of the targets, and (iii) a tethered probe specific to each target, (B) amplifying the plurality of targets in the mixture, (C) measuring fluorescence from the tethered probe for each target; and (D) determining from the measured fluorescence a quantity representative of a level of each of the targets in the sample. Each tethered probe may include respective first and second fluorophores, with distinguishable excitation and / or emission spectra, and a respective quencher. The probes are configured such that an intensity of fluorescence from one or both fluorophores is altered during amplification of the respective target, so that changes in fluorescence can be used to assess the degree of amplification of the respective target.

The invention relates to the technical field of typing identification, in particular to a primer and probe combination for typing identification of mycobacterium abscessus subspecies and a method and application of the primer and probe combination. The primer and probe combination comprises three subspecies specific amplification primer pairs and three subspecies specific TaqMan fluorescent probes; the sequences of the three pairs of subspecies specific amplification primers are SEQ ID NO. 1 to SEQ ID NO. 6; wherein the TaqMan fluorescent probe comprises three TaqMan fluorescent probes corresponding to mycobacterium abscessus subtypes, two ends of each TaqMan fluorescent probe are respectively provided with a fluorophore and a quenching group, and each sequence is SEQ ID NO.7 to SEQ ID NO.9. The invention further discloses a kit with the PCR reaction liquid, and by means of the PCR reaction liquid, the mycobacterium abscessus can be rapidly and accurately detected and identified, and subspecies typing identification can be conducted on the mycobacterium abscessus.

The present invention discloses a fluorescent probe and a fluorescent label for real-time non-destructive visualization monitoring of the freshness of meat food, and their preparation methods and applications. The structural formula of the fluorescent probe HBT-Bz is simple and easy to synthesize. Using the HBT fluorophore with ESIPT properties and AIE effect as the parent body and benzoxazole ester group as the recognition group for amine compounds, a fluorescence turn-on probe is designed and synthesized. The fluorescent probe HBT-Bz responds quickly and sensitively to amine compounds, with a detection limit as low as 5.1 ppm, and can be used to fabricate a solid fluorescence sensor for detecting volatile amine compounds. The synthetic route of the fluorescent probe involved in the present invention is simple, can recognize a variety of volatile amines, has a low detection limit, and the preparation process of the fluorescent label loaded with the fluorescent probe is simple. When in use, no pretreatment of the food is required. Placing the fluorescent label in the meat food packaging can realize real-time non-destructive visualization monitoring of the food freshness, and the results are accurate and reliable.

The invention relates to the technical field of optical molecular imaging, in particular to a fluorescent molecular tomography three-dimensional reconstruction system, method and device based on pixel and region integration layering Mama (PR3SM) and a three-dimensional scanning (Tri-scan) mechanism. Aiming at the problems of how to effectively capture global and local spatial characteristics of a fluorescence signal, how to accurately model a radial aggregation and diffusion mode of a fluorescence probe and how to realize a self-adaptive loss function to improve the reconstruction precision, the invention provides a layered three-way scanning Mama fluorescence molecular tomography reconstruction system based on pixel-region integration. The reconstruction precision is improved by introducing a Mama model, the feature modeling capability is enhanced by combining a layered PR-Mama module with a pixel-level SSM and a region-level SSM, forward, backward and spiral center scanning modes are fused through a three-way scanning mechanism, and a fluorophore distribution mode is effectively captured; the adaptive structure senses the loss function, integrates the mean square error and the local structure similarity loss, and improves the adaptability of the loss function.

The invention relates to the technical field of plant virus detection, in particular to a system and a method for detecting areca yellowing related viruses based on an RPA-LFD technology. The primer group for detecting the areca yellows virus APV1 is characterized by comprising a specific primer pair, the nucleotide sequence of an upstream primer in the specific primer pair is as shown in SEQ ID No.1 in a sequence table, and the nucleotide sequence of a downstream primer is as shown in SEQ ID No.2 in the sequence table; the device further comprises a probe. The probe is labeled and modified by biotin or FAM fluorophore; the nucleotide sequence of the modified probe is as shown in SEQ ID No.3 in the sequence table. The kit has the advantages that the kit has higher specificity and lower detection limit in the aspect of detection, and has no cross reaction with other viruses such as areca necrotic ringspot virus; the primer probe combination is suitable for RPA-LFD detection, and the time required by an amplification reaction is short; the reaction result is shown on the test strip and can be observed by naked eyes.

The present application relates to photostabilized or “self-healing” dyes that are constructed by attaching an azoaryl unit to a parent dye such that its optical properties are improved, particularly its optical properties that are most relevant in highly-demanding imaging, including instant brightness, signal stability, photon budget, and rate of detecting localisations. Therefore the compounds of the invention can be useful for high-performance imaging, e.g. delivering higher spatial and temporal resolution, within a shorter experimental acquisition time, and with more confidence, whether in oxygen-free conditions or in aerated conditions.

The invention relates to a kit for diagnosing non-small cell lung cancer as well as a use method and application thereof, and belongs to the field of biological medicines. The kit comprises reagents required by RNA extraction and reverse transcription, and a PCR amplification system containing primers and probes for respectively and specifically targeting SFTPA1 and SFTPA2 genes, wherein the PCR amplification system comprises primers and probes for respectively and specifically targeting SFTPA1 and SFTPA2 genes; the 5'end of the probe is provided with a fluorophore, and the 3 'end of the probe is provided with a quenching agent; the probe and the primer are designed based on specific regions of SFTPA1 and SFTPA2 genes, so that high specificity and high sensitivity of the probe and the primer in gene expression detection are ensured. The use method of the kit comprises the following steps: extracting RNA (Ribonucleic Acid) in a detection sample, reversely transcribing the RNA into cDNA (Complementary Deoxyribose Nucleic Acid), detecting the expression levels of the SFTPA1 and SFTPA2 genes by utilizing a qPCR (Quantitative Polymerase Chain Reaction) technology or a dPCR technology, and finally, preliminarily diagnosing whether a detection object suffers from the non-small cell lung cancer or not by comparing the expression differences of the SFTPA1 and SFTPA2 genes of the detection object and healthy people and non-small cell lung cancer patients. The invention provides a reliable tool for early diagnosis and individualized treatment of the non-small cell lung cancer.

In one general aspect, a method includes, during performance of an additive manufacturing process that includes photocuring of a resin, monitoring light output generated by a fluorophore in the resin that exhibits aggregation-induced emission (AIE) behavior. An indication of an extent of photocuring is output based on the monitored light output. In another general aspect, a resin for additive manufacturing includes molecules configured for photopolymerization and / or photocuring, the molecules being selected from the group consisting of monomers, oligomers, and polymers; a photoinitiator; and a fluorophore that exhibits aggregation-induced emission (AIE) behavior. The fluorophore is present in an amount of at least 0.00005 wt% relative to a total weight of the resin. In yet another general aspect, a three-dimensional encrypted structure includes a fluorophore that exhibits aggregation-induced emission (AIE) behavior. The structure has information encoded therein via the fluorophore, the information being viewable by illuminating the fluorophore with fluorescent light.

The invention discloses a fluorescence coding probe and a single cell immunoblotting method. The nucleic acid tag comprises oligonucleotide chains f1, f2... fn, n is greater than 2, each oligonucleotide chain contains a fluorophore and a quenching group, partial sequences of the next oligonucleotide chain and the previous oligonucleotide chain are complementarily paired, and the quenching group of the next oligonucleotide chain quenches the fluorophore of the previous oligonucleotide chain. Also disclosed is a quenching tag comprising a complementary strand capable of complementary pairing with an oligonucleotide strand in a nucleic acid tag. The invention discloses a fluorescent coding probe comprising a nucleic acid label, a preparation method of the fluorescent coding probe and application of the fluorescent coding probe in a multi-target single-cell immunoblotting technology, an immunofluorescence technology and an immunohistochemical staining technology. According to the fluorescence-coded multi-target single-cell immunoblotting method disclosed by the invention, multi-target protein detection can be carried out by utilizing limited fluorescence channels, the signal loss is small, and the expansibility is high.