Raman-activated cell sorting (RACS) offers prospects to complement the widely applied fluorescence-activated cell sorting (FACS). However, the methods used for measuring the Raman spectrum led to acquisition time of s...
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Raman-activated cell sorting (RACS) offers prospects to complement the widely applied fluorescence-activated cell sorting (FACS). However, the methods used for measuring the Raman spectrum led to acquisition time of seconds to minutes per cell, which is prohibitive for rapid cell sorting applications. The on-demand single cell trap-and-release enables RACSin a flowing modeon the microfluidics device by extending the Raman spectrum acquisition time. In contrast to earlier work using optical tweezers to trap single cell[1, 2],we integrated Dielectrophoresis(DEP)electrode pair into the sorting chip to trap single cell for Raman acquisition. Single Yeast cells was trapped and released serially in 20HZ frequency by controlling the voltage applied on the electrodes *** sorting efficiency was validated by sorting the mixture of 50% yeast cells and polystyrene beads (5 μm) and the yeast concentration was enriched to 90%.
Anew sensitive and selective method based on dispersive liquid-liquid microextraction (DLLME) coupled with spectrophotometric determination for analysis of mercury in Chuanxiong Rhizoma digestion was proposed. In the ...
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Anew sensitive and selective method based on dispersive liquid-liquid microextraction (DLLME) coupled with spectrophotometric determination for analysis of mercury in Chuanxiong Rhizoma digestion was proposed. In the proposed procedure EDTAwas used as masking agent, dithizone was used as chelating agents, carbon tetrachloride and ethanol as extraction and dispersive solvents respectively. The factors influencing on the extraction efficiency of Hg 2+ such as the extraction and dispersive solvent volume, pH of sample solution and spectrophotometric determination conditions were optimized. Accuracy of method was checked by spiked samples and ICP-MS. The detection limits of the method were achieved 22.0 ng L 1 . The established method was successfully applied to the determination of trace amounts Hg 2+ in Chuanxiong Rhizoma from deferent locations, and found that the Hg content in drug samples has obvious geographical characteristics.
Arapid determination method for trace sulfate ion in radar ethylene glycol coolants by ion chromatography was set up in the article. Determined using 200μl large sample quantitative volume, With sample diluted at lea...
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Arapid determination method for trace sulfate ion in radar ethylene glycol coolants by ion chromatography was set up in the article. Determined using 200μl large sample quantitative volume, With sample diluted at least 19+1(v/v) or greater, and gradient elution, a large amount of interference substance were eliminated , Then using Dionex-600 ion chromatography system including separate column IonPacAS11(4x250mm) and guard column IonPacAG11(4x50mm) suppressor and detector determined the trace sulfate content in the sample, By optimizing the chromatographic conditions including flow rate and eluent concentration, Several other common anions, which are fluoride、chloride 、nitrite、nitrate、phosphate and organic acids can be separated . When the concentration of sulfate was in the range from 0.1mg/L to 10mg/L, the regression coefficient was 0.9999. The relative standard deviation of sulfate ion is 2.4% (n=9), The detection limit is 0.05mg/L. This method is simple in operation and can be finished in 18 min. As a result the determination of trace sulfate in radar coolant by IC is practicality and promote meaningful.
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