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The development of rapid toxicity detection technology has higher requirements for electrode. In this work, a stable, sensitive and cost-effective microelectrode array (MEA) was successfully prepared manually. The advantage of the as-prepared MEA was discussed by means of detecting toxicity of 3,5-Dichlorophenol (3,5-DCP) by contrasting with bulk electrode and single microelectrode, in which mixed...
DNA 3′-phosphatase takes an important role in DNA damage repair, replication and recombination. Here, we present a novel label-free fluorescent assay for T4 polynucleotide kinase/phosphatase (T4 PNKP) activity and its inhibitor screening by using poly(thymine)-templated fluorescent copper nanoparticles (CuNPs) as a fluorescent indicator. In this assay, we designed a simple T-rich hairpin primer with...
Using mediator as electron acceptor for biochemical oxygen demand (BOD) measurement was developed in the last decade (BODMed). However, until now, no BODMed in a flow system has been reported. This work for the first time describes a flow system of BODMed method (BODMed-FS) by using potassium ferricyanide as mediator and carbon fiber felt as substrate material for microbial immobilization. The system...
This study describes the ability of an on-line concentration capillary electrochromatography (CEC) coupled with mass spectrometry (MS) for the determination of eight common penicillin antibiotics. Poly(stearyl methacrylate–divinylbenzene) (poly(SMA–DVB)) based monolithic columns prepared under the same conditions but differing only in the charged monomer were used as separation columns. Vinylbenzyl...
In this paper, we proposed a method by using co-immobilized Escherichia coli (E. coli) as a biocatalyst and neutral red (NR) as an artificial electronic acceptor to modify glassy carbon electrode (GCE) for biochemical oxygen demand (BOD) measurement. Two different modification approaches of GCE were utilized and compared. In one approach, NR was electropolymerized on the surface of GCE, and E. coli...
In this article, we developed a native biofilm (NBF) bioreactor used for biochemical oxygen demand mediated method (BOD Med ). There were two innovations differed from previous BOD Med assay. Firstly, the immobilization of microorganisms was adopted in BOD Med . Secondly, the NBF was introduced for BOD measurement. The NBF bioreactor has been characterized by optical microscopy...
In this paper, we first reported the viable but nonculturable (VBNC) cells used for fabricating biosensor. The organic–inorganic hybrid material composed of silica and the grafting copolymer of poly(vinyl alcohol) and 4-vinylpyridine (PVA-g-P(4-VP)) was used to immobilize microbial cells for biosensor fabrication. The VBNC cells were formed after the hybrid material dried, showing the cell walls were...
Monitoring biochemical oxygen demand (BOD) by mediator method (BOD Med ) has been developed for recent years and deaerated condition was generally adopted to avoid the effect of oxygen, but the deaerated condition was unfavorable in practical applications. Herein, we first proposed another way to explore non-deaerated BOD Med (called NDA-BOD Med ) method utilizing ferricyanide,...
In this paper, we synthesized a unique cathode catalyst Co/Fe/N/CNTs with high performance oxygen reduction. Through the π-stacking force, the cobalt porphyrins (CoTMPP) and iron phthanlocyanine (FePc) were deposited to the carbon nanotubes (CNTs) sidewall. The CoTMPP/FePc functionalized CNTs were used as the precursor to prepare the Co/Fe/N/CNTs based oxygen reduction nanocatalyst through high-temperature...
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