1
|
Sharma R, Kar PK, Dash S. Efficient adsorption of some substituted styrylpyridinium dyes on silica surface from organic solvent media – Analysis of adsorption-solvation correlation. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126847] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
2
|
Green fluorescent carbon dots as targeting probes for LED‐dependent bacterial killing. NANO SELECT 2021. [DOI: 10.1002/nano.202100183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
|
3
|
Mehranpour A, Hashemnia S, Azamifar F, Bashiri E. Synthesis and Characterization of New Quinoline Bounded Pentamethine Cyanine Dyes. ORG PREP PROCED INT 2020. [DOI: 10.1080/00304948.2020.1780881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
4
|
Wang JC, Chi SW, Yang TH, Chuang HS. Label-Free Monitoring of Microorganisms and Their Responses to Antibiotics Based on Self-Powered Microbead Sensors. ACS Sens 2018; 3:2182-2190. [PMID: 30221509 DOI: 10.1021/acssensors.8b00790] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Rapid detection of bacteria and their susceptibility to specific antibiotics plays a vital role in microbial infection treatments. Antimicrobial susceptibility testing (AST) is a common measure to select effective drugs. However, the conventional practices, such as broth dilution, E-test, and disk diffusion, in clinical applications require a long turnaround time (∼3 days), thereby compromising treatments and increasing mortality. This study presents self-powered sensors for on-site microorganism monitoring and rapid AST based on functionalized microbeads. The microbead sensors are driven by Brownian motion, rendering external power unnecessary. Fluorescent microbeads ( dp = 2 μm) were coated with vancomycin to capture bacteria. The growth and responses of Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus under antibiotic treatment were evaluated. The method showed stable selective binding despite the presence of some interferential substances, such as proteins and cells. Diffusivity change was strongly related to bacterial concentration. Accordingly, the diffusivity values of microbeads bound with motile and nonmotile bacteria exhibited specific patterns because of extra motility from microbes and increased particle diameter. Only a drop of microbead-bacteria suspension (∼5 μL) was needed in a microchip for each measurement. The microchip provided a steady environment for measurement over a few hours. By distinguishing the slope of the last four data points in the temporal diffusivity curve, bacterial susceptibility or resistance to specific antibiotics could be determined within a time frame of 2 h. The study provides insights into saving more lives by using a fast and robust AST technique in future clinical practice.
Collapse
Affiliation(s)
- Jhih-Cheng Wang
- Division of Urology, Department of Surgery, Chi Mei Medical Center, Tainan City, Taiwan 710
| | | | - Tai-Hua Yang
- Department of Orthopedic Surgery, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan City, Taiwan 701
| | | |
Collapse
|
5
|
Nucleic acid import into mitochondria: New insights into the translocation pathways. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:3165-81. [DOI: 10.1016/j.bbamcr.2015.09.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 08/16/2015] [Accepted: 09/10/2015] [Indexed: 11/18/2022]
|
6
|
Tripathy S, Dash S. Solvation studies of some tailor made α-N,N-dimethylaminostyryl-N-alkyl pyridinium dyes in binary solvent mixtures containing alcohols, hexane, 1,4-dioxane, DCM and acetone. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.01.046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
7
|
Tripathy S, Guru PS, Dash S. Solvatochromic behavior of some α-styrylpyridinium dyes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 125:422-430. [PMID: 24568791 DOI: 10.1016/j.saa.2014.01.121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 01/05/2014] [Accepted: 01/26/2014] [Indexed: 06/03/2023]
Abstract
The influences of solvent polarity and substituent on the electronic transition of six different N-butyl-α-styrylpyridinium dyes have been investigated in 21 solvents. Reichardt's E(T)(30) scale has been used to propose a quantitative approach towards the relative stability of the electronic ground and excited state species. The solvents have been classified into three types and the dyes have been classified into four groups based on the contribution of field and inductive effects of the substituents towards the change in their absorption maxima values. Instead of a steady solvatochromism, all the dyes except p-nitro substituted one, suffer reversals in solvatochromism at E(T)(30) values of ~37 and ~48. The extents of contribution of non-polar and polar protic solvents towards the solvation of the excited states of the dye molecules have been determined to be 30-40% more than that towards the stability of their ground states by the dipolar aprotic solvents. The ortho effect shown by this class of dyes in contrast to their corresponding γ-isomers might have been responsible for their better solvent polarity sensing capability.
Collapse
Affiliation(s)
- Sarita Tripathy
- Department of Chemistry, Veer Surendra Sai University of Technology, Burla 768 018, India
| | - Partha Sarathi Guru
- Department of Chemistry, Veer Surendra Sai University of Technology, Burla 768 018, India
| | - Sukalyan Dash
- Department of Chemistry, Veer Surendra Sai University of Technology, Burla 768 018, India.
| |
Collapse
|
8
|
Proteomics of a toxic dinoflagellate Alexandrium catenella DH01: Detection and identification of cell surface proteins using fluorescent labeling. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s11434-012-5156-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
9
|
|
10
|
Hernandez-Mendoza A, Rivas-Jimenez L, Garcia HS. Assessment of Aflatoxin B1Binding toLactobacillus reuteriby Microscopy and Fluorescence Techniques. FOOD BIOTECHNOL 2011. [DOI: 10.1080/08905436.2011.576561] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
11
|
Koskenniemi K, Laakso K, Koponen J, Kankainen M, Greco D, Auvinen P, Savijoki K, Nyman TA, Surakka A, Salusjärvi T, de Vos WM, Tynkkynen S, Kalkkinen N, Varmanen P. Proteomics and transcriptomics characterization of bile stress response in probiotic Lactobacillus rhamnosus GG. Mol Cell Proteomics 2010; 10:M110.002741. [PMID: 21078892 DOI: 10.1074/mcp.m110.002741] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Lactobacillus rhamnosus GG (GG) is a widely used and intensively studied probiotic bacterium. Although the health benefits of strain GG are well documented, the systematic exploration of mechanisms by which this strain exerts probiotic effects in the host has only recently been initiated. The ability to survive the harsh conditions of the gastrointestinal tract, including gastric juice containing bile salts, is one of the vital characteristics that enables a probiotic bacterium to transiently colonize the host. Here we used gene expression profiling at the transcriptome and proteome levels to investigate the cellular response of strain GG toward bile under defined bioreactor conditions. The analyses revealed that in response to growth of strain GG in the presence of 0.2% ox gall the transcript levels of 316 genes changed significantly (p < 0.01, t test), and 42 proteins, including both intracellular and surface-exposed proteins (i.e. surfome), were differentially abundant (p < 0.01, t test in total proteome analysis; p < 0.05, t test in surfome analysis). Protein abundance changes correlated with transcriptome level changes for 14 of these proteins. The identified proteins suggest diverse and specific changes in general stress responses as well as in cell envelope-related functions, including in pathways affecting fatty acid composition, cell surface charge, and thickness of the exopolysaccharide layer. These changes are likely to strengthen the cell envelope against bile-induced stress and signal the GG cells of gut entrance. Notably, the surfome analyses demonstrated significant reduction in the abundance of a protein catalyzing the synthesis of exopolysaccharides, whereas a protein dedicated for active removal of bile compounds from the cells was up-regulated. These findings suggest a role for these proteins in facilitating the well founded interaction of strain GG with the host mucus in the presence of sublethal doses of bile. The significance of these findings in terms of the functionality of a probiotic bacterium is discussed.
Collapse
Affiliation(s)
- Kerttu Koskenniemi
- Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Thomas MS, Nuñez V, Upadhyayula S, Zielins ER, Bao D, Vasquez JM, Bahmani B, Vullev VI. Kinetics of bacterial fluorescence staining with 3,3'-diethylthiacyanine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:9756-9765. [PMID: 20481488 DOI: 10.1021/la1013279] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
For more than a century, colorimetric and fluorescence staining have been the foundation of a broad range of key bioanalytical techniques. The dynamics of such staining processes, however, still remains largely unexplored. We investigated the kinetics of fluorescence staining of two gram-negative and two gram-positive species with 3,3'-diethylthiacyanine (THIA) iodide. An increase in the THIA fluorescence quantum yield, induced by the bacterial dye uptake, was the principal reason for the observed emission enhancement. The fluorescence quantum yield of THIA depended on the media viscosity and not on the media polarity, which suggested that the microenvironment of the dye molecules taken up by the cells was restrictive. The kinetics of fluorescence staining did not manifest a statistically significant dependence neither on the dye concentration, nor on the cell count. In the presence of surfactant additives, however, the fluorescence-enhancement kinetic patterns manifested species specificity with statistically significant discernibility.
Collapse
Affiliation(s)
- Marlon S Thomas
- Department of Bioengineering, University of California, Riverside, California 92521, USA
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Qiao X, Wang L, Ma J, Deng Q, Liang Z, Zhang L, Peng X, Zhang Y. High sensitivity analysis of water-soluble, cyanine dye labeled proteins by high-performance liquid chromatography with fluorescence detection. Anal Chim Acta 2009; 640:114-20. [DOI: 10.1016/j.aca.2009.03.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2008] [Revised: 02/14/2009] [Accepted: 03/09/2009] [Indexed: 10/21/2022]
|
14
|
Meguellati K, Spichty M, Ladame S. Reversible Synthesis and Characterization of Dynamic Imino Analogues of Trimethine and Pentamethine Cyanine Dyes. Org Lett 2009; 11:1123-6. [DOI: 10.1021/ol802913b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kamel Meguellati
- ISIS Université Louis Pasteur 8, Allée Gaspard Monge, BP 70028, 67083 Strasbourg, France
| | - Martin Spichty
- ISIS Université Louis Pasteur 8, Allée Gaspard Monge, BP 70028, 67083 Strasbourg, France
| | - Sylvain Ladame
- ISIS Université Louis Pasteur 8, Allée Gaspard Monge, BP 70028, 67083 Strasbourg, France
| |
Collapse
|