摘要:
Disclosure herein are methods for determining whether or not an immunoglobulin is present above the polyclonal background level in a biological sample, and methods for determining whether an immunoglobulin contains a kappa or lambda light chain. These methods are useful for screening biological samples for the presence or absence of monoclonal gammopathy, and for diagnosing and monitoring monoclonal gammopathy in a subject.
摘要:
The invention provides a novel additive for improved analysis by mass spectrometry. More specifically, ascorbic acid has been found to reduce or eliminate the presence of adducts commonly present in mass spectra. The improved processes and compositions of the invention allow for increased accuracy, sensitivity and throughput for samples analyzed by mass spectrometry.
摘要:
A surface-assisted laser desorption/ionization method according to an aspect includes: a first process of preparing a sample support (2) having a substrate (21) in which a plurality of through-holes (S) passing from one surface (21a) thereof to the other surface (21b) thereof are provided and a conductive layer (23) that covers at least the one surface (21a); a second process of placing a sample (10) on a sample stage (1) and arranging the sample support (2) on the sample (10) such that the other surface (21b) faces the sample (10); and a third process of applying a laser beam (L) to the one surface (21a) and ionizing the sample (10) moved from the other surface (21b) side to the one surface (21 a) side via the through-holes (S) due to a capillary phenomenon.
摘要:
A method of mass spectrometry or ion mobility spectrometry is disclosed comprising: providing an analyte; supplying a matrix compound to said analyte such that said analyte dissolves in said matrix; forming first droplets of the dissolved analyte; and colliding said first droplets with a collision surface. The use of matrix improves the analyte ion signal.
摘要:
A method is disclosed comprising providing a biological sample on a swab, directing a spray of charged droplets onto a surface of the swab in order to generate a plurality of analyte ions, and analysing the analyte ions.
摘要:
A method of analysis using mass spectrometry and/or ion mobility spectrometry is disclosed. The method comprises: using a first device to generate smoke, aerosol or vapour from a target comprising or consisting of a microbial population; mass analysing and/or ion mobility analysing said smoke, aerosol or vapour, or ions derived therefrom, in order to obtain spectrometric data; and analysing said spectrometric data in order to analyse said microbial population.
摘要:
A method for analyzing a sample includes trapping a first ion packet in a first segment of a multi-segment reaction cell; trapping a second ion packet in a second segment of the multi-segment reaction cell; and trapping a third ion packet in a third segment of the multi-segment reaction cell. At least one of the first, second, and third ion packets includes precursor ions, and at least another one of the first, second, and third ion packets includes reagent ions. The method further includes mixing the first, second, and third ion packets within the reaction cell to cause a reaction between the precursor ions and the reagent ions to form product ions.
摘要:
The method describes rapid screening of whole blood samples, pin prick and blood spot cards, subjected to MALDI—ToF Mass spectrometry. The spectra is generated and compared to those from normal healthy controls. Characteristic spectra are indicative of the presence of a hemoglobinopathy and the method can be used to screen/diagnose all sickle cell diseases, alpha and beta Thalassemias.
摘要:
The present invention is concerned with a method of identifying microbial strains (e.g. from a cell culture), the method comprising; i) a lipid extraction step, comprising extraction of phospholipids from the microbe, suitably with an extraction composition comprising more than 50 vol % MeOH; ii) a sample preparation step, comprising preparation of a MALDI sample incorporating the extracted lipids; iii) a data gathering step, comprising performing MALDI-based mass spectrometry on the MALDI sample, and iv) a microbe identification step, comprising analysis of the mass spectrometry data to characterise or identify the microbial strain. Suitably the method also includes extracting proteins from the microbes and analysing the extracted proteins using MALDI-based mass spectrometry so as to obtain not only lipid m/z data but also protein m/z data.