A new kind of ndniature conductance cell with thick electrodes was made, which has high resolution, high sensitivity, but no dead volume. A set of capillary electrophoresis device with on-column conductivity detector ...A new kind of ndniature conductance cell with thick electrodes was made, which has high resolution, high sensitivity, but no dead volume. A set of capillary electrophoresis device with on-column conductivity detector was assembled. In order to test the performance of this kind of ndni-cell, different kinds of Anni-cells were used to detect Li+, Na+, K+, Ca2+and Mg2+ ions.展开更多
Nowadays, there are about 415 million adults suffering from diabetesN. At present, the treatment for diabetes patients is monitoring their blood glucose level frequently and then taking the appropriate amount of oral ...Nowadays, there are about 415 million adults suffering from diabetesN. At present, the treatment for diabetes patients is monitoring their blood glucose level frequently and then taking the appropriate amount of oral hypogly- cemic drugs and insulin to control their blood glucose level.展开更多
The fast separation capability of a novel miniaturized capillary electrophoresis with an amperometric detection （μCE-AD） system was demonstrated by determining clenbuterol and salbutamol in real samples. The effect...The fast separation capability of a novel miniaturized capillary electrophoresis with an amperometric detection （μCE-AD） system was demonstrated by determining clenbuterol and salbutamol in real samples. The effects of several factors such as the acidity and concentration of the running buffer, the separation voltage, the applied potential and the injection time on CE-AD were examined and optimized. Under the optimum conditions, the two β-agonists could be baseline separated within 60 s at a separation voltage of 2 kV in a 90 mmol/L H3BO3-Na2B4O7 running buffer （pH 7.4）, which was not interfered by ascorbic acid and uric acid. Highly linear response was obtained for above compounds over three orders of magnitude with detection limits ranging from 1.20×10^-7 to 6.50×10^-8 mol/L （S/N=3）. This method was successfully used in the analysis of feed and meat products with relatively simple extraction procedures.展开更多
Due to their important biological role as markers for different pathologies, sialic acid （SA） analyses are important for clinical research. In this work, a miniaturized capillary electrophoresis with amperometrie de...Due to their important biological role as markers for different pathologies, sialic acid （SA） analyses are important for clinical research. In this work, a miniaturized capillary electrophoresis with amperometrie detection （mini-CE-AD） was developed for the determination of N-aeetylneuraminic acid （NANA）, which is the most widespread form of SAs. NANA was first oxidized by periodic acid in an acidic solution, and then the oxidation product β-formyl pyruvic acid was derivatized with electroactive 2-thiobarbituric acid （TBA） to form an electroactive NANA-TBA adduct, which could be readily determined by mini-CE-AD. The limit of detection （LOD） of NANA-TBA could achieve 0.50 μg/mL （1.6 μmol·L-1, S/N=3） based on an online enrichment approach of moving chemical reaction boundary. The proposed method was successfully applied to the analysis of NANA in human saliva, and the recoveries were in the range of 91.8%-109% with RSDs of 1.8%-3.9%. Due to its simple design and construction, low cost and portability, the mini-CE-AD device will possess more practicability in more field work as an alternative to conventional and microchip CE approaches.展开更多
文摘A new kind of ndniature conductance cell with thick electrodes was made, which has high resolution, high sensitivity, but no dead volume. A set of capillary electrophoresis device with on-column conductivity detector was assembled. In order to test the performance of this kind of ndni-cell, different kinds of Anni-cells were used to detect Li+, Na+, K+, Ca2+and Mg2+ ions.
基金supported by the National Natural Science Foundation of China(NSFC)under Grant No.61308086
文摘Nowadays, there are about 415 million adults suffering from diabetesN. At present, the treatment for diabetes patients is monitoring their blood glucose level frequently and then taking the appropriate amount of oral hypogly- cemic drugs and insulin to control their blood glucose level.
文摘The fast separation capability of a novel miniaturized capillary electrophoresis with an amperometric detection （μCE-AD） system was demonstrated by determining clenbuterol and salbutamol in real samples. The effects of several factors such as the acidity and concentration of the running buffer, the separation voltage, the applied potential and the injection time on CE-AD were examined and optimized. Under the optimum conditions, the two β-agonists could be baseline separated within 60 s at a separation voltage of 2 kV in a 90 mmol/L H3BO3-Na2B4O7 running buffer （pH 7.4）, which was not interfered by ascorbic acid and uric acid. Highly linear response was obtained for above compounds over three orders of magnitude with detection limits ranging from 1.20×10^-7 to 6.50×10^-8 mol/L （S/N=3）. This method was successfully used in the analysis of feed and meat products with relatively simple extraction procedures.
基金This work was supported by the National Natural Science Foundation of China （No. 21205042）, the Daxia Foundation of East China Normal University （No. 2015DX-284） and the Students Innovative Experimental Project of Shanghai Municipality （No. 201610269070）. The authors have declared no conflicts of interest.
文摘Due to their important biological role as markers for different pathologies, sialic acid （SA） analyses are important for clinical research. In this work, a miniaturized capillary electrophoresis with amperometrie detection （mini-CE-AD） was developed for the determination of N-aeetylneuraminic acid （NANA）, which is the most widespread form of SAs. NANA was first oxidized by periodic acid in an acidic solution, and then the oxidation product β-formyl pyruvic acid was derivatized with electroactive 2-thiobarbituric acid （TBA） to form an electroactive NANA-TBA adduct, which could be readily determined by mini-CE-AD. The limit of detection （LOD） of NANA-TBA could achieve 0.50 μg/mL （1.6 μmol·L-1, S/N=3） based on an online enrichment approach of moving chemical reaction boundary. The proposed method was successfully applied to the analysis of NANA in human saliva, and the recoveries were in the range of 91.8%-109% with RSDs of 1.8%-3.9%. Due to its simple design and construction, low cost and portability, the mini-CE-AD device will possess more practicability in more field work as an alternative to conventional and microchip CE approaches.
