273results about "Mass spectrometric analysis" patented technology

The present invention relates to a mass spectrometric method for determining isomeric amino acid residues of a peptide and comprises the steps of: generating a list of peptide candidates using the amino acid lead sequence of the peptide, said lead sequence comprising positions of determined amino acid residues and at least one position with undetermined isomeric amino acid residues; predicting the collision cross section for each peptide candidate; comparing the predicted collision cross section of each peptide candidate with an experimentally determined collision cross section of the peptide and assigning the isomeric amino acid residues of the best matching peptide candidate to the isomeric amino acid residues of the peptide.

Provided herein are methods and kits for identifying a pregnancy-associated risk or condition in a subject. In embodiments, the methods include detecting levels of at least one biomarker in a substantially cell-free cervical fluid sample obtained from the subject. In embodiments, the methods include detecting levels of biomarkers in a cervical fluid sample including extravillous trophoblasts (EVT) obtained from the subject.

A novel group of 7 marker metabolites (7MetP) is described, which comprises or consists of a diacetyl spermine, a diacetyl spermidine, an N-(3-acetamidopropyl) pyrrolidin-2-one, an N-acetylneuraminic acid ester, an N-acetyl-mannosamine, an N-acetyl-lactosamine, and a hydroxyisobutyric acid.

The invention relates to the quantitative measurement of steroidal compounds by mass spectrometry. In a particular aspect, the invention relates to methods for quantitative measurement of steroidal compounds from multiple samples by mass spectrometry.

Methods for differentiating full-length high molecular weight kininogen (HMWK) and cleaved HMWK in a sample are provided herein. Such methods may comprise treating a biological sample with a protease to generate a plurality of digested peptides, and measuring one or more signature peptides, which are indicative of cleaved HMWK and / or full-length HMWK.

To provide methods and related kits for detecting early stage pancreatic ductal adenocarcinoma, and methods of treating a patient susceptible, or suspected of being susceptible, to pancreatic ductal adenocarcinoma.SOLUTION: A method of determining susceptibility of a patient to pancreatic ductal adenocarcinoma is provided, the method comprising obtaining a biological sample from the patient, measuring the level of CA19-9 antigen in the biological sample, measuring the level of TIMP1 antigen in the biological sample, and measuring the level of LRG1 antigen in the biological sample, where the amounts of CA19-9 antigen, TIMP1 antigen, and LRG1 antigen classifies the patient as being susceptible to pancreatic ductal adenocarcinoma or not susceptible to pancreatic ductal adenocarcinoma.SELECTED DRAWING: None

The present invention provides a quality analysis device, an evaluation and calibration method thereof, an analysis method, and a reagent. The evaluation method of the quality analysis device includes: performing quality analysis on an ester of phthalic acid using the quality analysis device to detect a plurality of ions generated by dissociation of the ester of phthalic acid; and obtaining information on whether the quality analysis device is in a state suitable for analysis based on the intensity ratio of the plurality of detected ions.

The present disclosure relates to methods for diagnosing and evaluating a subject that has sustained or may have sustained an injury to the head, such as a traumatic brain injury (TBI). In particular, the present disclosure identifies various biomarkers, the detection and / or differential expression of which can be used to assess the presence or absence of a TBI in a subject, and can be used as a basis for diagnosing a subject as having a specific type of TBI (e.g., severe TBI or subclasses of mild TBI). The various TBI biomarkers can be detected individually or in combination and can be used as an important diagnostic, prognostic, and / or TBI risk stratification tool as part of assessing a subject's TBI status.

By adapting isotopic fingerprinting to the human body, experimental data revealed a specific chemical fingerprint of cancer, such as prostate cancer, "fossilized" in samples such as a patient's hair or nails. To interpret the isotopic chemical data of the samples, a predictive model was developed using machine learning algorithms and several dimensions to enable population differentiation. In several aspects, this provides a non-invasive method for cancer diagnosis, detection, or assessment developed by identifying the chemical fingerprint of cancer. TIFF2026509162000028.tif53159

Provided are methods for determining the amount of estrone in a sample using mass spectrometry. The methods generally involve ionizing estrone in a sample and detecting and quantifying the amount of the ion to determine the amount of estrone in the sample.

The instant disclosure relates to methods which employ the detection of ADP-D-glycero-β-D-manno-heptose (ADP-heptose) in a biological sample obtained from an individual. In certain aspects, the methods comprise administering a treatment to an individual in which ADP-heptose is detected. The methods may further comprise determining whether the individual has clonal hematopoiesis of indeterminate potential (CHIP) and circulating ADP-heptose.

This invention provides compositions and treatment methods for reducing hyperphenylalaninemia. [Solution] A genetically modified bacterium is provided, comprising: a) one or more genes encoding phenylalanine ammonia lyase (PAL), which are operably linked to a promoter that is not naturally associated with the PAL gene and can be directly or indirectly induced; b) one or more genes encoding a phenylalanine transporter, which are not naturally associated with the phenylalanine transporter gene and can be operably linked to a promoter that is directly or indirectly induceable; and c) one or more genes encoding mutant fumarate and nitrate reductase (FNR), which are not naturally associated with the FNR gene and can be operably linked to a promoter that is directly or indirectly induceable.

An IROA Matrix of metabolite compounds is disclosed. Each of whose compounds has a molecular weight of 2000 AMU or less, and is present as first and second isotopomers that are equally present at two predetermined isotopomeric balances, and contain 2 to 10% of a first isotope, and 90 to 98% of a second isotope, respectively. A reagent pair for transforming a natural abundance mass spectral analysis metabolite sample into an IROA sample is also disclosed and comprises two reactively identical reagents that constitute first and second isotopomers containing 2 to 10% of a first isotope, and 90 to 98% of a second isotope, respectively. Each of the reagent pair contains the same reactive group that reacts with and bonds to a functional group of one or more compounds present in a composition of biologically-produced metabolite compounds. Methods of making and using the above and related materials are also disclosed.

Provided are: a method which is for analyzing a neurogranin-related peptide and can suppress deviations in analysis results; and a method for preparing a biological sample containing the neurogranin-related peptide used for same. A method for preparing a sample solution containing a neurogranin-related peptide involves mixing a biological sample containing the neurogranin-related peptide with an organic solvent having a relative polarity of 0.200 to 0.700 to prepare a sample solution containing the organic solvent having a final concentration of at least 5.0 (v / v)%.

The invention belongs to the technical field of biological medicine, and particularly relates to application of a metabolic marker in preparation of a product for diagnosing abdominal aortic aneurysm. The metabolic marker comprises one or more than two of 5-delta-hydroxybutyl hydantoin, I-alpha-amino acid, PGF2 alpha, D-pyroglutamic acid, nicotine glucuronide, cysteine glutathione disulfide or Trp-P-1. Experiments prove that the metabolic marker has the advantages that the metabolic marker can be applied to the field of biomarkers, and the metabolic marker can be applied to the field of biomarkers; the seven metabolites are independently or jointly used as metabolic markers for diagnosing the abdominal aortic aneurysm and have good specificity and sensitivity.

The invention relates to a method for analyzing a biological sample for changes in signatures of key metabolites in a hepatic disease, comprising (a) isolating erythrocytes from the biological sample, (b) identifying and optionally quantifying lipids from the erythrocytes as the key metabolites for a hepatic and infectious disease, including the lipids PC (28:0), PC (30:0), PC (30:1), PC (32:0), PC (32:1), PC (34:0), PC (34:1), PC (34:2), PC (36:0), PC (36:1), PC (36:2), PC (36:3), PC (36:4), PC (38:0), PC (38:1), PC (38:2), PC (38:3) and PC (38:4); SM (17:0), SM (12:0), SM (14:0), SM (16:0), SM (18:0), SM (18:1), SM (20:0), SM (22:0), SM (24:0), SM (24:1), SM (26:0) and SM (26:1); LPE (16:0), LPE (16:1), LPE (18:0), LPE (18:1), LPE (18:2) and LPE (20:4); Cer (15:0), Cer (12:0), Cer (14:0), Cer (16:0), Cer (18:0), Cer (18:1), Cer (20:0), Cer (22:0), Cer (24:0) and Cer (24:1); LPC (16:0), LPC (16:1), LPC (17:0), LPC (18:0), LPC (18:1), LPC (18:2), LPC (20:0), LPC (20:1), LPC (20:3) and LPC (20:4), and LPE (16:0), LPE (16:1), LPE (17:1), LPE (18:0), LPE (18:1), LPE (18:2) and LPE (20:4); (c) carrying out principal component analysis of the samples and clustering according to subgroups; (d) identifying key metabolites by means of XGBoost algorithm; (e) detecting the changes in the key signatures of the key metabolites of the hepatic disease identified in step (d), and (f) diagnosing a hepatic disease. The invention further relates to the use of the results of this method in personalized medicine.

The present disclosure provides methods and materials for screening a compound or monitoring a subject's response to a compound or dosing regimen for treating a PGRN-associated disorder. Methods and materials for identifying and treating a subject having a PGRN-associated disorder are also provided.

Analysis of samples injected into an inductively coupled plasma source can be improved by one or more of a stabilizing solution that is mixable with the sample prior to injection and a heated injector. With relatively low amounts of dissolved solids (e.g., at or below about 0.2%), the stabilizing solution can minimize differences in osmotic pressure between the solution and the cells. The stabilizing solution can contain a salt (e.g., ammonium nitrate) present at a concentration of at least 5 mM. The injector can be heated before and / or during injection. In some cases, heat from adjacent portions can be directed into the injector to improve heating of the injector. An injector heated to a sufficient temperature can minimize solute accumulation and can extend the available time between cleanings. These improvements may be particularly useful in elemental analysis such as inductively coupled plasma mass spectrometry or inductively coupled plasma optical emission spectroscopy.

The present invention relates to a method for determining the sex of a fetus in an ungulate.

The invention relates to a panel of biomarkers, comprising or consisting of: benzene, benzothiazole, decane, isothiocyanato-cyclohexane, methylstyrene, phenol, styrene, toluene, 1-hexanol, 2-butoxyethanol, and p-xylene. In particular to the use of this panel in i) diagnosing eosinophilia in a subject, ii) treating an asthmatic subject with eosinophilia and / or who is suffering severe exacerbations, or iii) monitoring treatment efficacy in a subject with eosinophilia and / or who is suffering severe exacerbations.

The present invention describes a comprehensive system and method for the simultaneous early detection of multiple cancers in a single analysis. The system involves a Liquid Chromatography-Mass Spectrometry (LC-MS) device coupled with processors and AI / ML algorithms. The LC-MS device analyses metabolite ions from dried extracts of biological fluid samples, aligning and normalizing the data while minimizing errors. Quality control processes, including a neural network model and critical ion monitoring, ensure accurate detection. The system employs AI / ML processes to create two models: the Cancer Detection AI (CDAI) Model for identifying cancerous samples, and the Tissue of Origin Identification (TOOAI) Model for distinguishing specific cancer types. The models are applied to test samples, providing scores based on tissue of origin probabilities. The invention aims to revolutionize early cancer detection through advanced analytical and machine learning techniques.

An object of the present invention is to provide a method capable of detecting whether a subject has systemic lupus erythematosus (preferably nephrotic syndrome) with high accuracy without performing a renal biopsy, a biomarker for carrying out such detection, and the like. The concentration of 3′,4′-didehydro-3′-deoxycytidine in urine collected from a test subject is measured, and this concentration is compared with a reference concentration for control, which allows to detect whether the above-mentioned test subject has systemic lupus erythematosus (preferably lupus nephritis) with high accuracy.

The present invention describes a comprehensive system and method for the simultaneous early detection of multiple cancers in a single analysis. The system involves a liquid chromatography-mass spectrometry (LC-MS) instrument coupled with a processor and AI / ML algorithms. The LC-MS instrument analyzes metabolite ions from dried extracts of biological fluid samples and aligns and normalizes the data while minimizing errors. Quality control processes, including neural network models and critical ion monitoring, ensure accurate detection. The system employs an AI / ML process to create two models: a Cancer Detection AI (CDAI) model for identifying cancer samples and a Tissue of Origin Identification (TOOAI) model for distinguishing specific cancer types. These models are applied to test samples and provide a score based on tissue of origin probability. The present invention aims to revolutionize early cancer detection through advanced analytical and machine learning techniques.

The invention discloses a partial acylated non-natural sugar for metabolic labeling and application, the partial acylated non-natural sugar is a mannose type of a pyranose structure, and 1-hydroxyl and 6-hydroxyl are protected by hydrophobic groups. According to the method, the advantages of existing non-natural sugar are taken into consideration, it is guaranteed that the non-natural sugar can be efficiently utilized by cells, S side reaction of the non-natural sugar and cysteine in protein in the metabolism process is effectively avoided, and meanwhile efficient metabolism marking is achieved. In a cell test, the use concentration of the 1, 6-diacylated non-natural sugar is one order of magnitude lower than that of the non-natural sugar without the protecting group.

An anti-immunoglobulin specific antibody (or fragment thereof), characterised that the antibody or fragment thereof comprises one or more non-disulphide cross-links between at least one heavy chain or fragment thereof and at least one light chain or fragment thereof of the antibody or fragment thereof. A method purifying an anti-immunoglobulin specific antibody (or fragment thereof), characterised that the antibody or fragment thereof comprises one or more non-disulphide cross-links between at least one heavy chain or fragment thereof and at least one light chain or fragment thereof of the antibody or fragment thereof. A method of quantifying an amount of a subject analyte, or a fragment of an analyte in a sample from the subject comprising: (i) adding to the sample a predetermined amount of one or more control analytes or fragments thereof, which are distinguishable from the equivalent subject analyte or fragment; (ii) measuring the relative amount of the subject analyte or fragment and the amount of the control analyte or fragment in the sample; and (iii) comparing the relative amount of subject analyte or fragment to the relative amount of control analyte or fragment, to quantify the amount of analyte or fragment in the original subject sample.

An IROA Matrix of metabolite compounds is disclosed. Each of whose compounds has a molecular weight of 2000 AMU or less, and is present as first and second isotopomers that are equally present at two predetermined isotopomeric balances, and contain 2 to 10% of a first isotope, and 90 to 98% of a second isotope, respectively. A reagent pair for transforming a natural abundance mass spectral analysis metabolite sample into an IROA sample is also disclosed and comprises two reactively identical reagents that constitute first and second isotopomers containing 2 to 10% of a first isotope, and 90 to 98% of a second isotope, respectively. Each of the reagent pair contains the same reactive group that reacts with and bonds to a functional group of one or more compounds present in a composition of biologically-produced metabolite compounds. Methods of making and using the above and related materials are also disclosed.

Methods are provided for detecting the amount of one or more CAH panel analytes (i.e., pregnenolone, 17-OH pregnenolone, progesterone, 17-OH progesterone, dehydroepiandrosterone (DHEA), androstenedione, testosterone, deoxycorticosterone, 11-deoxycortisol, and cortisol) in a sample by mass spectrometry. The methods generally involve ionizing one or more CAH panel analytes in a sample and quantifying the generated ions to determine the amount of one or more CAH panel analytes in the sample. In methods where amounts of multiple CAH panel analytes are detected, the amounts of multiple analytes are detected in the same sample injection.

Methods for differentiating full-length high molecular weight kininogen (HMWK) and cleaved HMWK in a sample are provided herein. Such methods may comprise treating a biological sample with a protease to generate a plurality of digested peptides, and measuring one or more signature peptides, which are indicative of cleaved HMWK and / or full-length HMWK.

A method of analysis using mass spectrometry and / or ion mobility spectrometry is disclosed comprising: (a) using a first device to generate smoke, aerosol or vapour from a target plant material; (b) mass analysing and / or ion mobility analysing said smoke, aerosol or vapour, or ions derived therefrom, in order to obtain spectrometric data; and (c) analysing said spectrometric data in order to identify and / or characterise said plant material.

The purpose of the present invention is to provide a method for evaluating the intestinal barrier function of a subject, the method comprising the steps of: (1a) measuring a biomarker in a subject derived from the subject, and acquiring a measured value of the biomarker; (1b) comparing the measured value obtained in step 1a with a reference value to obtain a comparison result; and (1c) a step for evaluating the intestinal barrier function of the subject on the basis of the comparison result obtained in step 1b, the subject being blood, serum or plasma, and the biomarker comprising one or more substances selected from the group of substances of the present invention.