1
|
Ray S, Mondal P. Electronic Substitution Effect on the Ground and Excited State Properties of Indole Chromophore: A Computational Study. Chemphyschem 2023; 24:e202200541. [PMID: 36334020 DOI: 10.1002/cphc.202200541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 10/15/2022] [Indexed: 11/07/2022]
Abstract
Indole, being the main chromophore of amino acid tryptophan and several other biologically relevant molecules like serotonin, melatonin, has prompted considerable theoretical and experimental interest. The current work focuses on the investigation of substitution effect on the ground and excited electronic states of indole using computational quantum chemistry. Having three close-lying excited electronic states, the vibronic coupling effect becomes extremely important yet challenging for the photophysics and photochemistry of indole. Here, we have evaluated the performance of time-dependent density functional theory against available experimental and ab initio results from the literature. The electronic effects on the excited states of indole and indole derivatives e. g. tryptophan, serotonin and melatonin are reported. A bathochromic shift has been observed in the absorption spectrum for the La state. The absorption wavelength increases in the order of indole<tryptophan <serotonin <melatonin. While the contribution of the in-plane small adjacent groups increases the electron density of the indole ring, the out-of-plane long substituent groups have minor effect. The absorption spectra calculated including the vibronic coupling are in good agreement with experiments. These results can be used to estimate the error in photophysical observables of indole derivatives calculated considering indole as a prototypical system.
Collapse
Affiliation(s)
- Soumyadip Ray
- Department of Chemistry and Center for Atomic, Molecular and Optical Sciences and Technologies, Indian Institute of Science Education and Research (IISER) Tirupati, Karakambadi Road, Mangalam, Tirupati, 517507, Andhra Pradesh, India
| | - Padmabati Mondal
- Department of Chemistry and Center for Atomic, Molecular and Optical Sciences and Technologies, Indian Institute of Science Education and Research (IISER) Tirupati, Karakambadi Road, Mangalam, Tirupati, 517507, Andhra Pradesh, India
| |
Collapse
|
2
|
Liang C, Qi PX, Garcia RA, Lee C. Molecular basis for the performance and mechanisms of methylated decolorized bovine hemoglobin flocculants. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
3
|
May B, Naqi HA, Tipping M, Scott J, Husbands SM, Blagbrough IS, Pudney CR. Synthetic Cannabinoid Receptor Agonists Detection Using Fluorescence Spectral Fingerprinting. Anal Chem 2019; 91:12971-12979. [PMID: 31580647 PMCID: PMC7006962 DOI: 10.1021/acs.analchem.9b03037] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
![]()
Synthetic
cannabinoid receptor agonists (SCRAs), termed “Spice”
or “K2”, are molecules that emulate the effects of the
active ingredient of marijuana, and they have gained enormous popularity
over the past decade. SCRAs are Schedule 1 drugs that are highly prevalent
in the U.K. prison system and among homeless populations. SCRAs are
highly potent and addictive. With no way to determine the dose/amount
at the point-of care, they pose severe health risks to users, including
psychosis, stroke, epileptic seizures, and they can kill. SCRAs are
chemically diverse, with over a hundred compounds used as recreational
drugs. The chemical diversity of SCRA structures presents a challenge
in developing detection modalities. Typically, GC-MS is used for chemical
identification; however, this cannot be in place in most settings
where detection is critical, e.g., in hospital Emergency Departments,
in custody suites/prisons, or among homeless communities. Ideally,
real time, point-of-care identification of SCRAs is desirable to direct
the care pathway of overdoses and provide information for informed
consent. Herein, we show that fluorescence spectral fingerprinting
can be used to identify the likely presence of SCRAs, as well as provide
more specific information on structural class and concentration (∼1
μg mL–1). We demonstrate that that fluorescence
spectral fingerprints, combined with numerical modeling, can detect
both parent and combusted material, and such fingerprinting is also
practical for detecting them in oral fluids. Our proof-of-concept
study suggests that, with development, the approach could be useful
in a range of capacities, notably in harm reduction for users of Spice/K2.
Collapse
|
4
|
Defez R, Valenti A, Andreozzi A, Romano S, Ciaramella M, Pesaresi P, Forlani S, Bianco C. New Insights into Structural and Functional Roles of Indole-3-acetic acid (IAA): Changes in DNA Topology and Gene Expression in Bacteria. Biomolecules 2019; 9:biom9100522. [PMID: 31547634 PMCID: PMC6843775 DOI: 10.3390/biom9100522] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 09/18/2019] [Accepted: 09/21/2019] [Indexed: 12/11/2022] Open
Abstract
: Indole-3-acetic acid (IAA) is a major plant hormone that affects many cellular processes in plants, bacteria, yeast, and human cells through still unknown mechanisms. In this study, we demonstrated that the IAA-treatment of two unrelated bacteria, the Ensifer meliloti 1021 and Escherichia coli, harboring two different host range plasmids, influences the supercoiled state of the two plasmid DNAs in vivo. Results obtained from in vitro assays show that IAA interacts with DNA, leading to DNA conformational changes commonly induced by intercalating agents. We provide evidence that IAA inhibits the activity of the type IA topoisomerase, which regulates the DNA topological state in bacteria, through the relaxation of the negative supercoiled DNA. In addition, we demonstrate that the treatment of E. meliloti cells with IAA induces the expression of some genes, including the ones related to nitrogen fixation. In contrast, these genes were significantly repressed by the treatment with novobiocin, which reduces the DNA supercoiling in bacterial cells. Taking into account the overall results reported, we hypothesize that the IAA action and the DNA structure/function might be correlated and involved in the regulation of gene expression. This work points out that checking whether IAA influences the DNA topology under physiological conditions could be a useful strategy to clarify the mechanism of action of this hormone, not only in plants but also in other unrelated organisms.
Collapse
Affiliation(s)
- Roberto Defez
- Istituto di Bioscienze e BioRisorse, via P. Castellino 111, 80131 Naples, Italy.
| | - Anna Valenti
- Istituto di Bioscienze e BioRisorse, via P. Castellino 111, 80131 Naples, Italy.
| | - Anna Andreozzi
- Istituto di Bioscienze e BioRisorse, via P. Castellino 111, 80131 Naples, Italy.
| | - Silvia Romano
- Istituto di Bioscienze e BioRisorse, via P. Castellino 111, 80131 Naples, Italy.
| | - Maria Ciaramella
- Istituto di Bioscienze e BioRisorse, via P. Castellino 111, 80131 Naples, Italy.
| | - Paolo Pesaresi
- Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, 20133 Milan, Italy.
| | - Sara Forlani
- Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, 20133 Milan, Italy.
| | - Carmen Bianco
- Istituto di Bioscienze e BioRisorse, via P. Castellino 111, 80131 Naples, Italy.
| |
Collapse
|
5
|
Chen H, Lin C, Xiong C, Liu Z, Zhang Y. One-pot synthesis of fluorescent 2,4-dialkenylindoles by rhodium-catalyzed dual C–H functionalization. Org Chem Front 2017. [DOI: 10.1039/c6qo00755d] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A one-pot synthesis of fluorescent 2,4-dialkenylindoles by rhodium-catalyzed dual C–H bond alkenylation of indoles.
Collapse
Affiliation(s)
- Hui Chen
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Cong Lin
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Chunhua Xiong
- Department of Applied Chemistry
- Zhejiang Gongshang University
- Hangzhou
- China
| | - Zhanxiang Liu
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Yuhong Zhang
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| |
Collapse
|
6
|
Liu F, Tang J, Xu J, Shu Y, Xu Q, Wang H, Hu X. Low potential detection of indole-3-acetic acid based on the peroxidase-like activity of hemin/reduced graphene oxide nanocomposite. Biosens Bioelectron 2016; 86:871-878. [PMID: 27494811 DOI: 10.1016/j.bios.2016.07.089] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 07/20/2016] [Accepted: 07/25/2016] [Indexed: 11/24/2022]
Abstract
An amperometric sensor was firstly established for the detection of indole-3-acetic acid (IAA) at low potential based on the hemin/reduced graphene oxide (hemin/rGO) composite. The hemin/rGO nanocomposite was prepared by a simple and facile hydrothermal method without using any reducing agent. It exhibited peroxidase-like activity for the catalytic oxidation of IAA in the presence of oxygen. The consumption of oxygen has a linear relationship with the concentration of IAA in the range from 0.1 to 43μM and from 43 to 183μM. The detection limit was down to 0.074μM. This sensor was unaffected by many interfering substances and stable over time. Such work broadened the application of hemin/rGO and provided a new method for IAA detection.
Collapse
Affiliation(s)
- Fengping Liu
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 China
| | - Jiaqian Tang
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 China
| | - Jun Xu
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 China
| | - Yun Shu
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 China
| | - Qin Xu
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 China.
| | - Hongmei Wang
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 China
| | - Xiaoya Hu
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 China.
| |
Collapse
|
7
|
Sengupta B, Mukherjee P, Das S, Rafiq S, Gupta S, Dethe DH, Sen P. Femtosecond dynamics of photoinduced cis-trans isomerization of ethyl-3-(1H-indole-3-yl)acrylate. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.08.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
8
|
|
9
|
Molecular recognition of indole derivatives by polymers imprinted with indole-3-acetic acid: A QSPR study. Bioorg Med Chem 2013; 21:653-9. [DOI: 10.1016/j.bmc.2012.11.048] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2012] [Revised: 11/19/2012] [Accepted: 11/29/2012] [Indexed: 11/19/2022]
|
10
|
Maragos CM. Photoreaction of indole-containing mycotoxins to fluorescent products. Mycotoxin Res 2009; 25:67-75. [DOI: 10.1007/s12550-009-0010-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 03/19/2009] [Accepted: 03/20/2009] [Indexed: 11/28/2022]
|
11
|
Li YN, Wu HL, Zhu SH, Nie JF, Yu YJ, Wang XM, Yu RQ. Determination of indole-3-acetic acid in soil using excitation-emission matrix fluorescence with trilinear decomposition-based calibration methods. ANAL SCI 2009; 25:83-8. [PMID: 19139578 DOI: 10.2116/analsci.25.83] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Indole-3-acetic acid (IAA) is a phytohormone of the auxin group and is capable of coordinating the overall processes of plant growth and development. IAA is active in the very low concentration range. Therefore, it is important to quantify IAA in the low concentration range in complex system. In this work, a new spectrofluorometric method for the direct determination of IAA in soil is proposed and discussed. It combines the fluorescence excitation-emission matrices (EEMs) with second-order calibration methods based on the alternating trilinear decomposition (ATLD) algorithm and the self-weighed alternating trilinear decomposition (SWATLD) algorithm. These methodologies fully exploit the second-order advantage of the three-way fluorescence data, allowing the analyte concentrations to be quantified even in the presence of unknown fluorescent interferents. IAA recoveries in soil were determined as 100.6 +/- 3.0 and 96.9 +/- 1.1% with ATLD and SWATLD, respectively. The limits of detection obtained were 17.6 and 4.6 ng mL(-1), and the limits of quantification were 52.9 and 13.9 ng mL(-1) with ATLD and SWATLD, respectively.
Collapse
Affiliation(s)
- Yuan-Na Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | | | | | | | | | | | | |
Collapse
|
12
|
Abstract
Cyclopiazonic acid (CPA) is a mycotoxin produced by some of the same species of fungi that produce the more widely known aflatoxins. As a consequence it has been found previously that CPA and the aflatoxins may co-occur in commodities under certain conditions. CPA, which is a substituted indole, has a chromophore with absorptions in the ultraviolet (UV) region (223 nm, 278 nm). Quantification of CPA is commonly accomplished by liquid chromatographic separation followed by detection of one of the UV absorbances. CPA has not previously been described as fluorescent, and it likely is not. However, herein we report that, following exposure to high intensity UV light in a photochemical reactor, fluorescent products of CPA are produced. In methanol or aqueous acetonitrile these products have an excitation maximum of 372 nm and an emission maximum of 462 nm. Upon exposure to UV light for extended periods a decrease in the absorbance of CPA at 223 nm and 278 nm and a concomitant increase in fluorescence was observed. CPA and aflatoxin B1 were separated by reverse-phase liquid chromatography and the eluant was subjected to post-column photolysis, which allowed the fluorescence detection of both toxins. The ability to photolyse CPA and detect this toxin by fluorescence may open up new avenues for determination of this mycotoxin alone or together with the aflatoxins.
Collapse
Affiliation(s)
- C. Maragos
- Mycotoxin Research Unit, National Center for Agricultural Utilization Research, ARS, USDA, 1815 N. University Street, Peoria, IL 61604, USA
| |
Collapse
|
13
|
|
14
|
Nighswander-Rempel SP, Mahadevan IB, Bernhardt PV, Butcher J, Meredith P. Solvochromic Effects in Model Eumelanin Compounds. Photochem Photobiol 2008; 84:620-6. [DOI: 10.1111/j.1751-1097.2007.00290.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
15
|
Galian RE, Veglia AV. Fluorescence quenching inhibition of substituted indoles by neutral and ionized cyclodextrins nanocavities. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.11.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
16
|
|
17
|
Rele M, Kapoor S, Hedge S, Naumov S, Mukherjee T. Photophysical characteristics and density functional theory calculations of indole 2-carboxylic acid in the presence of mercurous ions. RESEARCH ON CHEMICAL INTERMEDIATES 2006. [DOI: 10.1163/156856706778400299] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|