123 results about "Fraction Collector" patented technology

A method and apparatus for controlling fraction collection in an eluent stream flowing from an LC column. A triggering detector recognizes the presence of a target substance according to characteristics of chromatographic peaks in the eluent stream and initiates a delay timer to trigger the fraction collector. A waste stream detector is disposed at any distance from the fraction collector to detect peaks in the waste stream flowing from a fraction collector. The signature of fraction collector actuation is seen by the waste stream detector, permitting the delay time to be adjusted for optimal collection of the target compound. The presence or absence of a peak or the characteristics of a remnant peak detected by the waste stream detector are used to confirm that the target component of the eluent stream was collected as intended by the fraction collector.

The invention relates to liquid chromatography techniques for rapidly characterizing samples, such as polymer solutions, emulsions and dispersions, and to devices for implementing such techniques. The system includes a design that provides the ability to perform chromatographic separations by using mobile phase composition gradients and temperature gradients during separations. The invention accomplishes this by providing mixing zones for a plurality of fluids as well as heated and chilled feeds feeding the fluids to the mixing zones. Additionally, the system provides the ability to analyze separated components with a detector and / or collect separated fractions into vessels of a fraction collector for further separation and / or analysis.

The invention belongs to the technical field of environmental protection, and particularly relates to an online atmospheric fine particulate matter concentration and collection device and method. Thedevice comprises a PM2.5 cutting head, a water tank system, a virtual cutting system, a condensation circulating system and an online concentrated sample collection system, wherein the water tank system comprises a water tank, an electric heating rod and a temperature control digital display device, the PM2.5 cutting head is communicated with the water tank, the virtual cutting system comprises avirtual cutter, a concentrated airflow vacuum pump and a main airflow vacuum pump, the condensation circulating system comprises a condensing agent circulating pipe and a condenser, the condensation circulating system is used for circulating condensate to condense and grow up saturated particulate matters, and the online concentrated sample collection system comprises a biological sampling bottle,an electromagnetic valve, a relay, an automatic fraction collector and a computer subdivision constant flow pump. The device can concentrate the actual atmospheric fine particles by 7-10 times, and the concentration efficiency is high; technical support can be provided for subsequent online chemical component or toxicity detection; and the device is simple and convenient to operate, reliable, stable and low in maintenance cost.

A method for fractionating a sample solution includes the steps of setting a first mass spectrometry condition and mass range information; setting a second mass spectrometry condition and mass range information; executing a mass scan by the mass spectrum acquisition portion under the first mass spectrometry condition and obtaining first mass spectrum data; extracting first chromatogram data from the first mass spectrum data based on the first mass range information; executing a mass scan by the mass spectrum acquisition portion under the second mass spectrometry condition to obtain second mass spectrum data; extracting second chromatogram data from the second mass spectrum data based on the second mass range information; switching the first and second spectrometry conditions and repeating the mass scan cyclically; adding the first and second chromatograph data to obtain a chromatogram data; and operating the fraction collector based on the chromatogram data.

Valves, pumps, detectors, sample loops, fraction collectors and the like are individually incorporated into modules that are mountable in interchangeable manner at individual mounting sites on a base unit which also supports one or more chromatography columns. Each module includes fluid connections to other modules and a microcontroller joining the module to a computed and monitor through an electronic connector at each mounting site. The fluid connections between the modules and the column(s) are removed from the electronic connections and accessible to the user. A software platform recognizes the modules and their locations, coordinates fluid connections between the modules, and provides a variety of control, monitoring, data generating and data processing functions to generate chromatographic data.