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Jiang C, Xiao D, Yang P, Tao W, Song Z, He H. Simple and fast detection of homocysteine by cucurbit[7]uril fluorescent probe based on competitive strategy. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Chen J, Gao T, Chang Y, Wei Y, Wang Y. Supramolecular complexation between cucurbit[7]uril and folate and analytical applications. JOURNAL OF CHEMICAL RESEARCH 2021. [DOI: 10.1177/17475198211066489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Folate (FA) plays a key role in the biosynthesis of amino acids, purines, and pyrimidines in the human body, and intracellular folate metabolism has become an attractive target of tumor chemotherapy. In this work, an inclusion interaction was found between FA and cucurbit[7]uril (CB[7]), and the formation of a CB[7]-FA 2:1 supramolecular inclusion complex was confirmed by fluorescence spectra, UV-Vis absorption spectroscopy, 1H NMR, and molecular modeling calculations. In addition, FA is generally determined through the indirect fluorescent method because it shows weak fluorescence in aqueous solution. Therefore, a simple, direct fluorescence probe method for rapidly measuring FA was investigated, and the linear equation of FA was ΔF = 14.691C + 37.366 within the concentration ranges of 0.82 ~ 18.31 µg mL–1. The proposed direct fluorescence method was applied to the determination of spiked plasma. We demonstrated that this method could provide an experimental basis for the targeted administration of the CB[7]-FA complex, and it could be extended as a promising fluorescence detection method for drugs in vivo.
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Affiliation(s)
- Jue Chen
- Shanxi University of Chinese Medicine, Taiyuan, P.R. China
| | - Tengmei Gao
- Shanxi University of Chinese Medicine, Taiyuan, P.R. China
| | - Yinxia Chang
- Shanxi University of Chinese Medicine, Taiyuan, P.R. China
| | - Yanming Wei
- Shanxi University of Chinese Medicine, Taiyuan, P.R. China
| | - Yonghui Wang
- Shanxi University of Chinese Medicine, Taiyuan, P.R. China
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Alnajjar MA, Nau WM, Hennig A. A reference scale of cucurbit[7]uril binding affinities. Org Biomol Chem 2021; 19:8521-8529. [PMID: 34378628 DOI: 10.1039/d1ob01304a] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The accurate determination of ultra-high binding affinities in supramolecular host-guest chemistry is a challenging endeavour because direct binding titrations are generally limited to affinities <106 M-1 due to sensitivity constraints of common titration methods. To determine higher affinities, competitive titrations are usually performed, in which one compound with a well established binding affinity serves as a reference. Herein, we propose a reference scale for such competitive titrations with the host cucurbit[7]uril (CB7) comprising binding affinities in the range from 103 to 1015 M-1. The suggested reference compounds are commercially available and will aid in the future determination of CB7 binding affinities for stimuli-responsive host-guest systems.
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Affiliation(s)
- Mohammad A Alnajjar
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany.
| | - Werner M Nau
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany.
| | - Andreas Hennig
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany. .,Institute of Chemistry of New Materials, Universität Osnabrück, Barbarastr. 7, 49080 Osnabrück, Germany.
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Ecofriendly Long Life Nanocomposite Sensors for Determination of Carbachol in Presence of Choline: Application in Ophthalmic Solutions and Biological Fluids. SENSORS 2019; 19:s19102357. [PMID: 31121893 PMCID: PMC6566716 DOI: 10.3390/s19102357] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 05/18/2019] [Accepted: 05/20/2019] [Indexed: 11/17/2022]
Abstract
Several emerging nano scale forms of carbon are showing great promise in electrochemical sensing such as graphene and multi-walled carbon nanotubes (MWCNTs). Herein we present an ecofriendly method to fabricate long life and sensitive ion selective sensors based on graphene and MWCNTs nanocomposites with no need for volatile organic solvents. Both sensors were fabricated, for the analysis of carbachol in ophthalmic solutions, plasma and urine where ion- association complex was formed between cationic carbachol and anionic Sodium tetra phenyl borate (NaTBP) in a ratio 1:1. Both sensors were evaluated according to the IUPAC recommendation data, revealing linear response in the concentration range 10−7 M to 10−2 M with near Nernstian slopes 50.80 ± 5 and 58.14 ± 3 mV/decade and correlation coefficients 0.9992 and 0.9998 for graphene and MWCNTs based sensors, respectively. Both sensors were successfully applied as stability indicating method for the analysis of carbachol in presence of its metabolite choline, in ophthalmic preparations, in plasma and urine showing good recovery percentage values. MWCNTs based sensor showed some advantages over graphene sensor regarding lower limit of detection (LOD), longer life time and higher selectivity towards carbachol. Statistical comparison of the proposed sensors with the official method showed no significant difference for accuracy and precision.
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Lee EC, Kim HJ, Park SY. Reversible Shape-Morphing and Fluorescence-Switching in Supramolecular Nanomaterials Consisting of Amphiphilic Cyanostilbene and Cucurbit[7]uril. Chem Asian J 2019; 14:1457-1461. [PMID: 30883032 DOI: 10.1002/asia.201900204] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Indexed: 02/06/2023]
Abstract
We demonstrate a reversible shape-morphing with concurrent fluorescence switching in the nanomaterials which are complexed with cucurbit[7]uril (CB[7]) in water. The cyanostilbene derivative alone forms ribbon-like two-dimensional (2D) nanocrystals with bright yellow excimeric emission in water (λem =540 nm, ΦF =42 %). Upon CB[7] addition, however, the ribbon-like 2D nanocrystals immediately transform to spherical nanoparticles with significant fluorescence quenching and blue-shifting (λem =490 nm, ΦF =1 %) through the supramolecular complexation of the cyanostilbene and CB[7]. Based on this reversible fluorescence switching and shape morphing, we could demonstrate a novel strategy of turn-on fluorescence sensing of spermine and also monitoring of lysine decarboxylase activity.
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Affiliation(s)
- Eung-Chang Lee
- Laboratory for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul, 08826, Korea
| | - Hyeong-Ju Kim
- Laboratory for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul, 08826, Korea
| | - Soo Young Park
- Laboratory for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul, 08826, Korea
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Bell JG, Mousavi MPS, Abd El-Rahman MK. Electrochemical Sensing of Carbachol in Ophthalmic Solutions. JOURNAL OF THE ELECTROCHEMICAL SOCIETY 2018; 165:B835-B839. [DOI: 10.1149/2.0571816jes] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Li W, Kuehne NW, Dallin E, Gordon R, Hof F. A supramolecular indicator displacement assay for acetyl amantadine, a proxy biomarker for spermidine/spermine N1-acetyltransferase (SSAT) activity. CAN J CHEM 2016. [DOI: 10.1139/cjc-2016-0411] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Acetyl amantadine (AcAm) is produced from amantadine (Am) in vivo upon catalysis by spermidine/spermine N1-acetyl transferase (SSAT). SSAT is a biomarker for multiple aggressive cancers, and the analysis of AcAm in urine has been promoted as a proxy measure for the early detection of cancer. We report here the development and optimization of cucurbit[7]uril–dye pair based indicator displacement assay (IDA) for the detection of AcAm in solution. In deionized water, using Rhodamine B as the dye, the limit of detection of AcAm was 0.087 μM with a linear response range from 0 to 1 μM. Using berberine as the dye, the limit of detection was 0.077 μM with the same range of linear response. Our efforts and difficulties in translating this assay to function in human urine are also described. We achieve a partial response of the berberine IDA to the presence of AcAm in urine that has undergone a simple PD-10 desalting step.
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Affiliation(s)
- Wei Li
- Department of Chemistry, University of Victoria, Victoria, BC V8W 3V6, Canada
| | - Nathan W. Kuehne
- Glenlyon Norfolk School, 801 Bank St., Oak Bay, BC V8S 4A8, Canada
| | - Erin Dallin
- Glenlyon Norfolk School, 801 Bank St., Oak Bay, BC V8S 4A8, Canada
| | - Reuven Gordon
- Department of Computer and Electrical Engineering, University of Victoria, Victoria, BC V8W 3V6, Canada
| | - Fraser Hof
- Department of Chemistry, University of Victoria, Victoria, BC V8W 3V6, Canada
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Fatiha M, Faiza B, Ichraf K, Leila N, Eddine KD. TD-DFT calculations of visible spectra and structural studies of carbendazim inclusion complex with cucurbit[7]uril. J Taiwan Inst Chem Eng 2015. [DOI: 10.1016/j.jtice.2014.12.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Elbashir AA, Aboul-Enein HY. Supramolecular Analytical Application of Cucurbit[n]urils Using Fluorescence Spectroscopy. Crit Rev Anal Chem 2014. [DOI: 10.1080/10408347.2013.876354] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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