Topic
Detection limit
About: Detection limit is a research topic. Over the lifetime, 34379 publications have been published within this topic receiving 644817 citations. The topic is also known as: limit of detection & lower detection limit.
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TL;DR: The results suggest that the Zr-LMOF has the potential for low-cost, rapid and in situ imaging detection of OPPs contamination via easy-to-read visual signal.
Abstract: Metal-organic frameworks (MOFs) have shown considerable prospects for sensing pesticide residues. However, the low stability of MOFs in water hinders them from testing food and environmental samples. Herein, we report an easy and cost-efficient synthesis of a water-stable zirconium luminescent MOF (Zr-LMOF) and its application for rapid, sensitive, and in situ detection of organophosphorous pesticides (OPPs). The Zr-MOF is prepared using Zr(IV) and 1,2,4,5-tetrakis(4-carboxyphenyl)benzene. The synthesized Zr-LMOF rapidly absorbs trace amounts of OPP parathion-methyl and indicates its presence. A low limit of detection of 0.115 μg kg-1 (0.438 nM) with a wide linear range from 70 μg kg-1 to 5.0 mg kg-1 was achieved. Satisfactory recoveries ranging from 78% to 107% were obtained for spiked food and environmental samples. Further, the Zr-LMOF was applied to imitate rapid and in situ imaging detection of pesticide residue on fresh produce nondestructively; visual signals appeared under ultraviolet light within 5 min. These results suggest that the Zr-LMOF has the potential for low-cost, rapid, and in situ imaging detection of OPPs contamination via easy-to-read visual signal.
94 citations
TL;DR: In this article, the authors measured the concentrations of dissolved titanium, gallium and indium in sea water using inductively coupled plasma mass spectrometry (ICP-MS) after concentration and separation from the major ions via an 8-hydroxyquinoline chelating ion exchange resin (TSK-8HQ).
94 citations
TL;DR: Single drop liquid-liquid-liquid microextraction combined with high performance liquid chromatography-UV detection was investigated for the determination of a popular drug of abuse, methamphetamine (MAP), and its major metabolite, amphetamine (AP), in urine samples.
94 citations
TL;DR: In this paper, a single ZnO nanowire-based biologically sensitive field effect transistors (bioFETs) was fabricated for detection of different concentrations of uric acid solution at the same time.
Abstract: Qualitative and quantitative detection of biological and chemical species is crucial in many areas, ranging from clinical diagnosis to homeland security. Due to the advantages of ultralow detection limit, label-free, fast readout and easy fabrication over the traditional detection systems, semiconductor nanowire based electronic devices have emerged as a potential platform. In this paper, we fabricated a single ZnO nanowire-based biologically sensitive field-effect transistors (bioFETs) for detection of different concentrations of uric acid solution at the same time. The addition of uric acid with the concentrations from 1 pM to 0.5 mM resulted in the electrical conductance changes of up to 227 nS, and the response time turns out to be in the order of millisecond. The ZnO NW biosensor could easily detect as low as 1 pM of the uric acid with 14.7 nS of conductance increase, which implied that the detection limit of the biosensor can be as low as 1 pM.
94 citations
TL;DR: In this article, a rapid indirect competitive fluorescence-linked immunosorbent assay (cFLISA) based on quantum dots (QDs) as the fluorescent marker has been developed for the detection of Enrofloxacin (ENR) in chicken muscle tissue.
94 citations