FOOD CHEMISTRY
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2021
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IF 7.514
Kuiyu Yi,Lei Zhang
An ingenious nanoscale fluorescent sensor derived from Eu 3+ -postfunctionalized MIL-53 (Al) (Eu 3+ @MIL-53 [Al]) was fabricated though a simple and effective approach. Malachite green (MG) effectively turned off the luminescence of Eu 3+ @MIL-53 (Al) via fluorescence resonance energy transfer (FRET), thus enabling MG sensing. The developed probe exhibited instantaneous reusability after being cleaned with deionized water. The fluorescence intensity, quenching efficiency, and crystal structure of the recoverable sensor after five recycling processes were unchanged compared with those of the original sample. Moreover, the potential mechanism of MG detection was revealed in detail. This work represents the first attempt to determine MG in aquaculture water and products by using metal–organic frameworks (MOFs). The Eu 3+ @MIL-53 (Al) probe proved to be a remarkable fluorescence probe for MG with high selectivity, sensitivity, and excellent regeneration capability. It provides a promising functional platform for the recognition of illegal MG addition to aquaculture water and products.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2011
·Vol. 50
·期 3
·590-598
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IF 3.894
Wei Lu,Dan Chen,Han Jiang,Liming Jiang,Zhiquan Shen
A new styryl-type monomer, 2-(4-vinylbenzyloxy)- 1 -naphthaldehyde thiosemicarbazone (VNT), was synthesized and then copolymerized with methyl methacrylate (MMA) by reversible addition fragmentation chain transfer polymerization affording a series of poly(MMA- co -VNT)s with different functional unit content, predetermined molecular weight, and narrow molecular-weight distribution. The desired copolymers were structurally confirmed by various spectroscopic characterizations. Colorimetric and fluorescent titration spectra revealed that the copolymers are highly selective toward fluoride anions over other competitive species including Cl − , Br − , I − , H 2 PO 4 − , AcO − , and HSO 4 − . On addition of F − , a remarkable colorless-to-yellow color change is easily observed by naked eyes. The influence of the copolymer composition and molecular weight on its sensing capacity was then carefully investigated. The results showed that higher VNT-incorporation amount within the copolymer chains leads to higher sensitivity toward F − ions. Interestingly, the chromogenic process of the polymeric sensor can be switched back and forth by successively adding F − and HSO 4 − anions into the dimethyl sulfoxide solution of the polymer, which may be represented by a complementary “IMPLICATION/INHIBIT” logic gate at molecular level using both the ions as the chemical inputs. Based on such a reversible and reproducible sensing system, we designed a molecular-scale sequential information processing circuit displaying “writing–reading–erasing–reading” behavior and “multiwrite” function in the form of binary logic. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011
研究领域:
高分子化学
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分析化学
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材料科学
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DOI
高影响因子
RSC Advances
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2021
·Vol. 11
·期 55
·34898-34907
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IF 3.361
Zhenzhen Liu,Runsen Li,Yan Li,Jingpeng Zhou,Yumei Gong,Haiqiang Shi,Yanzhu Guo,Haiming Li,Zhiwei Wang,Fengshan Zhang
A convenient and sensitive reversible-fluorescence sensing platform for accurate monitoring of high-valence metal ions is still very challenging. As a green kind of fluorescent carbon nanomaterials, carbon dots (CDs) have captured considerable attention because of the stable fluorescence property and low cost. Herein, we fabricated a type of nitrogen-functionalized carbon dots (N-CDs) from CMC as a fluorescent reversible sensing platform for detecting various high-valence metal ions. N-CDs with a mean size of 2.3 nm were obtained and possessed 22.9% quantum yields (QY). A label-free fluorescent probe for detection of high-valence metal ions (Fe3+, Cr6+, Mn7+) was established via the fluorescence quenching response. Among them, the detection limit (LOD) toward Fe3+ ions reached 0.8 µM. We have explored the quenching mechanism of N-CDs to explain the valence state-related electron-transfer fluorescence quenching between high-valence metal ions and N-CDs. Moreover, the valence state-related fluorescence quenching phenomenon of N-CDs in aqueous solution could be effectively recovered by introducing a reducing agent (Ti3+). This “turn off-on” fluorescence recovery system of N-CDs could be applied in different applications covering the selective detection of environmental high-valence metal ions and cellular imaging.
研究领域:
材料科学
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分析化学
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生物医学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2011
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IF 3.37
Wei Lu,Mengyu Zhang,Keyuan Liu,Bin Fan,Zheng Xia,Liming Jiang
A simple and efficient chemosensor 1 was synthesized by reacting thiosemicarbazide with 1-naphthaldehyde. It was found that the sensor is highly selective toward fluoride anions in both UV–vis and fluorescence channels in DMSO solution. Especially, the spectral responses of the sensor along with a visible color change can be switched back and forth by successively adding F − and HSO 4 − anions into the DMSO solution, which may be represented by a complementary “IMPLICATION/INHIBIT” logic gate at molecular level employing both the ions as the chemical inputs. Based on such a reversible and reproducible sensing system, we designed a molecular-scale sequential memory unit displaying “Writing-Reading-Erasing-Reading” and “Multi-write” functions in the form of binary logic.
研究领域:
分析化学
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超分子化学
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化学生物学
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分子工程
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生物传感器
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DOI
高影响因子
CARBOHYDRATE POLYMERS
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2025
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IF 12.5
Yanghang Liu,Lizhi Wang,Zirun Zhan,Yu Jiang,Xun Zhang,Yunhe Li,Xin Zhong,Dan Yu,Wei Wang
Real-time visual detection of ammonia (NH₃) is crucial for environmental safety and food quality, yet traditional sensors often suffer from slow response, poor selectivity, and limited adaptability. Here, we innovatively report an ammonium alginate (AL) and cellulose nanofiber-based colorimetric aerogel (APPC aerogel) with a sea anemone-inspired structure for rapid, sensitive, and reversible NH₃ detection. The aerogel is prepared by embedding a sulfonated indole photoacid (PMU H) into a matrix of AL, cellulose nanofibers (CNF), and phytic acid (PA), cast into a 3D-printed template, and directionally frozen to form an ordered porous bionic structure. Upon NH₃ exposure, PMU-H undergoes fast, reversible proton transfer and enol-keto tautomerization, producing a color change from yellow to purplish-red within 5 s. The aerogel shows a detection limit of 0.65 ppm, a linear range of 1–250 ppm, and maintains performance over 50 cycles. FTIR and DFT analyses reveal the sensing mechanism. The material remains stable under humidity, temperature variations, and complex gases, enabling effective visual monitoring of NH₃ during seafood spoilage and offering promise for food packaging, environmental monitoring, and safety applications.
研究领域:
材料科学
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传感器与生物传感器
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食品安全
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环境监测
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纳米技术
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功能材料
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）