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: A novel on-line sequential injection (SI) dispersive liquid-liquid microextraction (DLLME) system coupled to electrothermal atomic absorption spectrometry (ETAAS) was developed for metal preconcentration in micro-scale, eliminating the laborious and time consuming procedure of phase separation with centrifugation.
132 citations
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TL;DR: In this paper, an electrochemical sensor based on hierarchically Cu-BTC MOF material for non-electroactive glyphosate detection has been firstly constructed in order to increase the electrode reaction site.
Abstract: An electrochemical sensor based on hierarchically Cu-BTC MOF material for non-electroactive glyphosate detection has been firstly constructed in this report. By using Cu-BTC frameworks as a detection matrix, the large specific surface area of the material can increase the electrode reaction site and further improve the detection performance. The electrochemical behavior of Cu-BTC frameworks for glyphosate detection was evaluated by cyclic voltammetry (CV). Under optimum conditions, differential pulse stripping voltammetry (DPV) is employed to detect glyphosate. The results show that the fabricated sensor displays ultralow detection limit (1.4 × 10−13 mol L-1) and wide detection range (1.0 × 10-12 to 1.0 × 10-9 mol L-1 and 1.0 × 10-9 to 1.0 × 10-5 mol L-1). Besides, this sensor possesses acceptable reproducibility and stability, as well as good selectivity against the major metabolite of glyphosate aminomethylphosphonic acid (AMPA) and other interference. Furthermore, this electrochemical sensor can also be applied to the detection of glyphosate in soybean. It is worth mentioning that this effectively Cu-BTC based sensor has great potential application in favorable and selective detection of organophosphorus pesticides in actual samples.
132 citations
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TL;DR: An amperometric nitrite sensor based on a polymeric nikel tetraaminothphalocyanine film coated glassy carbon (GC) electrode was developed and the proposed method was successfully applied in the detection of nitrite in real samples.
132 citations
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TL;DR: In this paper, 9-Diazomethylanthracene reacts with carboxyl groups to give an ester derivative which can be used as either a fluorescence or ultraviolet label for fatty acid analysis by high-pressure liquid chromatography.
131 citations
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TL;DR: A novel enzyme-induced metallization colorimetric assay is developed to monitor and measure beta-galactosidase (β-gal) activity, and is further employed for colorIMetric bacteriophage (phage)-enabled detection of Escherichia coli (E. coli).
Abstract: A novel enzyme-induced metallization colorimetric assay is developed to monitor and measure beta-galactosidase (β-gal) activity, and is further employed for colorimetric bacteriophage (phage)-enabled detection of Escherichia coli (E. coli). This assay relies on enzymatic reaction-induced silver deposition on the surface of gold nanorods (AuNRs). In the presence of β-gal, the substrate p-aminophenyl β-d-galactopyranoside is hydrolyzed to produce p-aminophenol (PAP). Reduction of silver ions by PAP generates a silver shell on the surface of AuNRs, resulting in the blue shift of the longitudinal localized surface plasmon resonance peak and multicolor changes of the detection solution from light green to orange-red. Under optimized conditions, the detection limit for β-gal is 128 pM, which is lower than the conventional colorimetric assay. Additionally, the assay has a broader dynamic range for β-gal detection. The specificity of this assay for the detection of β-gal is demonstrated against several protein competitors. Additionally, this technique is successfully applied to detect E. coli bacteria cells in combination with bacteriophage infection. Due to the simplicity and short incubation time of this enzyme-induced metallization colorimetric method, the assay is well suited for the detection of bacteria in low-resource settings.
131 citations