Fabrication of a dual-emitting dye-encapsulated metal–organic framework as a stable fluorescent sensor for metal ion detection

Zhang, Ningzi; Zhang, Diwei; Zhao, Jing; Xia, Zhiguo

doi:10.1039/c9dt01125k

Cited by 70 publications

(45 citation statements)

References 25 publications

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“…To test the discrimination ability of the sensor array based on nanozymes, 12 kinds of metal ions including Sn 2+ , Fe 3+ , Cu 2+ , Ag + , Pb 2+ , Mg 2+ , Mn 2+ , Ca 2+ , Al 3+ , Cr 2+ , Ni + , Ba 2+ were chosen as the model analytes. Because of the different binding affinities between metal ions and nanozymes, the three kinds of nanozymes expressed different catalytic activities, and generated unique colorimetric response patterns as shown in Figure . The error bars represent the 12 calculated standard deviations for five replicate measurements.…”

Section: Resultsmentioning

confidence: 99%

Sensitive chemical sensor array based on nanozymes for discrimination of metal ions and teas

Cheng

Huang

et al. 2019

Luminescence

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Tea, originating from China, is an important part of Chinese traditional culture. There are different qualities of and producing areas for tea on the market, therefore it is necessary to discriminate between teas in a fast and accurate way. In this study, a chemical sensor array based on nanozymes was developed to discriminate between different metal ions and teas. The indicators for the sensor array are three kinds of nanozymes mimicking laccase (Cu‐ATP, Cu‐ADP, Cu‐AMP). The as‐developed sensor array successfully discriminated 12 metal ions and the detection limit was as low as 0.01 μM. The as‐developed sensor array was also able to discriminate tea samples. Different kinds of tea samples appeared in different areas in the canonical score plot with different response patterns. Furthermore, in a blind experiment, we successfully discriminated 12 samples with a 100% accuracy. This sensor array integrates chemistry and food science together, realizing the simultaneous detection of several kinds of teas using a sensitive method. The as‐developed sensor array would have an application in the tea market and provide a fast and easy method to discriminate between teas.

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Section: Resultsmentioning

confidence: 99%

Sensitive chemical sensor array based on nanozymes for discrimination of metal ions and teas

Cheng

Huang

et al. 2019

Luminescence

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“…[ 88 ] Encapsulation of fluorescent dyes into MOFs which eliminated the aggregation‐caused quenching could be used for detecting Fe 3+ ions. [ 89 ] The composite featured excellent selectivity and sensitivity to Fe 3+ ions with a K sv value of 5072 M −1 as compared with different metal ions. Molecules encapsulated in MOFs could also be applied in luminescence sources, bioimaging, chemical sensors, etc.…”

Section: Optical Biosensorsmentioning

confidence: 99%

Applications of Functional Metal‐Organic Frameworks in Biosensors

Chen

Zhu

et al. 2020

Biotechnology Journal

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In recent decades, fast advancements in the fields of metal‐organic frameworks (MOFs) are providing unprecedented opportunities for the development of novel functional MOFs for various biosensing applications. Exciting progress is achieved due to the combination of MOFs with various functional components, which introduces novel structures and new features to the MOFs‐based biosensing applications, such as higher stability, higher sensitivity, higher flexibility, and higher specificity. This review aims to be a comprehensive summary of the most recent advances in the development of functional MOFs for various biosensing applications, placing special attention on important contributions in recent 3 years. In this review, the most recent developments in design and synthesis of functional MOFs for biosensing applications are summarized. MOFs‐based biosensing applications are outlined according to the central roles of MOFs in biosensors, which include carriers of sensitive elements, enzyme‐mimic elements, electrochemical signaling, optical signaling, and gas sensing. Finally, the current challenges and future development trends of functional MOFs for biosensing applications are proposed and discussed.

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“…MOFs have been extensively used in dye adsorption due to their modifiable porous structure [33][34][35][36]. Furthermore, dye-incorporated MOFs have often been used for white light emission [37], the detection of nitro explosives [38], metal ions [39], organic molecules [40], photocatalysis [41], two-photon-pumped lasing [42], and solar cell manufacturing [43]. The xanthene-based fluorescein dye has been most extensively used, as it has a bright signal with a high quantum yield and is nontoxic.…”

Section: Introductionmentioning

confidence: 99%

Fluorescein Hydrazide-Appended Metal–Organic Framework as a Chromogenic and Fluorogenic Chemosensor for Mercury Ions

et al. 2021

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In this work, we prepared a fluorescein hydrazide-appended Ni(MOF) (Metal–Organic Framework) [Ni3(BTC)2(H2O)3].(DMF)3(H2O)3 composite, FH@Ni(MOF). This composite was well-characterized by PXRD (powder X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy), N2 adsorption isotherm, TGA (thermogravimetric analysis), XPS (X-ray photoelectron spectroscopy), and FESEM (field emission scanning electron microscopy). This composite was then tested with different heavy metals and was found to act as a highly selective and sensitive optical sensor for the Hg2+ ion. It was found that the aqueous emulsion of this composite produces a new peak in absorption at 583 nm, with a chromogenic change to a pink color visible to the naked eye upon binding with Hg2+ ions. In emission, it enhances fluorescence with a fluorogenic change to green fluorescence upon complexation with the Hg2+ ion. The binding constant was found to be 9.4 × 105 M−1, with a detection limit of 0.02 μM or 5 ppb. This sensor was also found to be reversible and could be used for seven consecutive cycles. It was also tested for Hg2+ ion detection in practical water samples from ground water, tap water, and drinking water.

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Fabrication of a dual-emitting dye-encapsulated metal–organic framework as a stable fluorescent sensor for metal ion detection

Abstract: The encapsulation of fluorescein dye into porous zinc–adenine metal–organic framework (bio-MOF-1) crystals has been studied for metal cation sensing.

Cited by 70 publications

References 25 publications

Sensitive chemical sensor array based on nanozymes for discrimination of metal ions and teas

Sensitive chemical sensor array based on nanozymes for discrimination of metal ions and teas

Applications of Functional Metal‐Organic Frameworks in Biosensors

Fluorescein Hydrazide-Appended Metal–Organic Framework as a Chromogenic and Fluorogenic Chemosensor for Mercury Ions

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