摘要:
The invention relates to an ion source means comprising at least one holding means for holding at least one sample to expose the sample to a mass spectrometer device, wherein the holding means comprises a structured sample support means for supporting the sample and/or a structured sample or sample comprising a structured surface, respectively.
摘要:
Improved apparatuses and methods are provided for ionizing samples and analyzing the samples with mass spectrometry. A liquid sample is electrosprayed into droplets out of the delivery end of a capillary. A conduit surrounds the capillary for transmitting a heated gas, the conduit being connected to a nozzle to release the heated gas into the ionization chamber, wherein the nozzle comprises at least one electrode to which a potential can be applied, which contributes to the generation of an electrical field at the delivery end of the capillary.
摘要:
An electrostatic atomizing (1) device includes an atomizing electrode (13) which generates charged fine water particles negatively charged in the form of mist, by generating an electric field when a high negative voltage is applied thereto in a state in which water is supplied; a water supply portion which supplies the water to the atomizing electrode; a discharge detection portion (5) which detects whether negative ion discharge, indicating discharge in which only negative ions are generated without generating the charged fine water particles, is occurring at the atomizing electrode or not; and a control portion (7) which reduces the electric field intensity of the electric field generated by the atomizing electrode when the discharge detection portion detects the occurrence of the negative ion discharge.
摘要:
The present invention provides methods for using detection methods, including mass spectrometry methods such as SELDI-TOF-MS, to detect and analyze molecules directly transferred from a sample to a surface to form a molecular print of the sample. Methods and compositions of the invention can be used to produce spatially and non-spatially oriented molecular prints for detection using methods such as mass spectrometry. Methods and compositions of the invention encompass molecular printing of tissues, cells and gels onto surfaces.
摘要:
The present invention provides a novel nanospray emitter that includes a fluid inlet, an outlet orifice, and a passage for fluid: communication between the fluid inlet and outlet orifice. In one aspect of this embodiment, the passage facilitating fluid communication between the inlet and outlet elements is comprised of an outer capillary of a rigid material, such as nickel, that houses an inner capillary made from a highly conductive and inert material, such as gold; alternatively the inner material may constitute an inner coating of the outer capillary.
摘要:
An ion source is disclosed for forming multiply-charged analyte ions from a solid sample (110). A beam of pulsed radiation (12o) is directed onto a portion of the sample to desorb analyte molecules, A retaining structure (135) holding a solvent volume (130) is positioned proximate the sample. Desorbed analyte molecules contact a free surface (210) of the solvent and pass into solution. The solution is then conveyed through an outlet passageway (140) to an electrospray apparatus (145, 235), which introduces a spray of charged solvent droplets into an ionization chamber.
摘要:
An improvement to Desorption Electrospray Ionization (DESI), the process of creating ions directly from sample surfaces for mass spectrometric (MS) analysis by impinging a liquid spray onto the surface. The improvement is brought about by enclosing the spray and sample surface and MS-inlet capillary in a pressure tight enclosure. The invention includes methods of sampling a larger or smaller area of surface by impacting and collecting droplets from such an area. The invention allows DESI to be performed without need for careful control of the geometry of the sprayer and MS-inlet capillary positions and angles relative to the sample surface.
摘要:
Field emission based ionization sources are provided, with the emitter (305) being a carbon nanotube field emitter. Such emitters can replace Ni-63 beta emitters. Ionization of a gas (308) that is flowed through the gap (310) between the emitter plates (301, 302) is performed by electron capture of the flow of electrons by the molecules in the gas (308).
摘要:
The present teachings relate to MALDI-TOF instruments, instrument components, and methods of operation thereof. In various aspects, the MALDI-TOF instrument can serve and be operated as a MS/MS instrument. In various embodiments, provided are MALDI-TOF instruments, and methods of operating one or more components of a MALDI-TOF instrument, that facilitate one or more of increasing sensitivity, increasing resolution, increasing dynamic mass range, increasing sample support throughput, and decreasing operational downtime.
摘要:
The invention relates to particles and monoliths for providing an ionized analyte for mass analysis by photon desorption having a size in the range of 0.5-100 μm, wherein said particles or monoliths are modified with a chemical compound capable of absorbing photons having a wave-length of at least 300 run. Said particles and monoliths allow the use of MALDI-MS for the high throughput screening of molecules having a molecular weight lower than 700 μ without interfering signals or with only a limited number of background signals.