The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
As an important biomarker of malignant tumors, spermine is closely related with some diseases. In this work, a nanometal surface energy transfer (NSET) strategy via the positively charged gold nanorods (AuNRs) and the negatively charged tetrakis (4-sulfonatophenyl) porphyrin (TPPS4) was developed to detect spermine in human urine. Under acidic condition, spermine possessed multi-cationic property...
A selective colorimetric assay for spermine was proposed in this work. In a weak alkaline medium, the conformational structure of double-stranded calf thymus DNA (ctDNA) was loosened to install gold nanoparticles (AuNPs) into chains. While, the chain assembly of AuNPs could form cross-linking aggregates when spermine was present, which was attributed to the electrostatic interaction between the positive...
As a novel kind of materials, metal-organic frameworks (MOFs) have great potential for the preconcentration of trace analytes. In our work, MIL-101(Cr) was prepared and applied as a solid phase extraction (SPE) sorbent for the pretreatment of sulfadiazine (SDA), sulfamethazine (SMZ), sulfachloropyridazine (SCP) and sulfamethoxazole (SMX) in different environmental water samples coupling with ultra-high...
Clinically, the amount of uric acid (UA) in biological fluids is closely related to some diseases such as hyperuricemia and gout, thus it is of great significance to sense UA in clinical samples. In this work, red gold nanoclusters (AuNCs) with relatively high fluorescence quantum yield and strong fluorescence emission were facilely available using bovine serum albumin (BSA) as template. The fluorescence...
The analytical methodologies for evaluation of multi-component system in traditional Chinese medicines (TCMs) have been inadequate or unacceptable. As a result, the unclarity of multi-component hinders the sufficient interpretation of their bioactivities. In this paper, an ultra-high-performance liquid chromatography coupled with linear ion trap–Orbitrap (UPLC–LTQ–Orbitrap)-based strategy focused...
A highly sensitive and effective strategy for rapid screening and identification of target constituents has been developed using full scan-parent ions list-dynamic exclusion (FS-PIL-DE) acquisition coupled to diagnostic product ions (DPIs) analysis on a hybrid LTQ-Orbitrap mass spectrometer. The FS-PIL-DE was adopted as a survey scan to trigger the MS/MS acquisition of all the predictable constituents...
Here, a rapid, simple and sensitive method for visual detection of tetracycline antibiotics (TCs) was developed based on the turned on fluorescence induced by a metal–organic coordination polymer of Zn(bix) [bix=1,4-bis(imidazol-1-ylmethyl)benzene]. Tetracycline antibiotics, such as tetracycline hydrochloride (TC), doxycycline hyclate (DC), chlortetracycline hydrochloride (CTC) and oxytetracyline...
A method of modified diagnostic fragment-ion-based extension strategy (DFIBES) coupled to DFIs (diagnostic fragmentation ions) intensity analysis was successfully established to simultaneously screen and identify the chlorogenic acids (CGAs) in Flos Lonicerae Japonicae (FLJ) by HPLC-ESI-MS n . DFIs, such as m/z 191 [quinic acid-H] − , m/z 179 [caffeic acid-H] − and m/z 173...
Urinary chromium speciation analysis can provide available information of the individual exposure levels of Cr(VI) compounds. An analytical method based on ion-pair reversed-phase HPLC combined with ICP-MS to simultaneously determine Cr(III) and Cr(VI) in human urine has been developed for assessing the occupational exposure to chromate. The separation conditions of the method, including the pH value,...
With the aids of localized plasmon resonance absorption and light-scattering measurements in this contribution, we investigated the aggregation of cetyltrimethylammonium bromide (CTAB) capped gold nanoparticles (AuNPs) in the presence of adenosine triphosphate (ATP). It was found that gradual aggregation of AuNPs occurs under physiological conditions with increasing ATP concentration from 200.0 to...
A novel and simple electrochemical method for determination of melamine is developed based on oligonucleotides film modified gold electrodes. The electrochemical probe of ferricyanide was used to investigate the interactions between oligonucleotides and melamine. Results of cyclic voltammetries, differential pulse stripping voltammetries, electrochemical impedance spectrometry and atomic force microscope,...
Based on well-known silver mirror reaction the Ag film was formed on Au film modified by self-assembled monolayer (SAM) of 1,6-hexanedithiol (HDT). The sensitivity of the biosensor based on this Ag/Au film is enhanced compared to that based on Au film. When the surface plasmon resonance (SPR) biosensor based on this Ag/Au film was used to determine human IgG, the range of concentrations of human IgG...
A poly(nickel(II) tetrasulfophthalocyanine)/multi-walled carbon nanotubes composite modified electrode (polyNiTSPc/MWNTs) was fabricated by electropolymerization of NiTSPc on MWNTs-modified glassy carbon electrode (GCE). The modified electrode was found to be able to greatly improve the emission of luminol electrochemiluminescence (ECL) in a solution containing hydrogen peroxide. Glucose oxidase (GOD)...
In this paper, the electrochemiluminescence (ECL) behavior of bis-[3,4,6-trichloro-2-(pentyloxycarbonyl)-phenyl] oxalate (BTPPO) at glassy carbon electrode (GCE) in phosphate buffer solution in the presence of hydrogen peroxide has been investigated when linear sweep voltammetry was applied. The optimum chemical conditions and electrochemical parameters for this ECL system have been investigated in...
Microemulsion electrokinetic chromatography (MEEKC) and solvent modified micellar electrokinetic chromatography (MEKC) were investigated with the goal of the rapid separation of complex heroin and amphetamine samples. The rapid simultaneous separation of 17 species of heroin, amphetamine and their basic impurities and adulterants was performed within about 10min using MEEKC for the first time, whereas...
Several hydroxyanthraquinones (emodin, rhein and physcion) were found to strongly enhance the cathodic electrochemiluminescence (ECL) of the lucigenin by scanning under the mode of differential pulse voltammetry. The enhanced intensity was linear with the concentrations of rhein, emodin and physcion. The linear calibration ranges of 8.0×10 −8 to 2.0×10 −6 , 3.0×10 −7 to 8.0×10...
Epinephrine was found to be able to strongly enhance the electrochemiluminescence (ECL) of lucigenin system by using the anodic potential sweep. Based on which, a novel ECL method for the determination of epinephrine was developed. Under the optimum condition, the enhanced ECL intensity was linear with the epinephrine concentration in the range of 4.0 × 10 −8 to 2.0 × 10 −7 molL ...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.