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Cetinkaya YN, Bulut O, Oktem HA, Yilmaz MD. Fluorescent silica nanoparticles as nano-chemosensors for the sequential detection of Pb 2+ ions and bacterial-spore biomarker dipicolinic acid (DPA) in aqueous solution. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 303:123222. [PMID: 37542871 DOI: 10.1016/j.saa.2023.123222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/07/2023] [Accepted: 07/30/2023] [Indexed: 08/07/2023]
Abstract
Herein, we report fluorescein-labelled silica nanoparticles (FSNP) which serve as fluorescent nano-chemosensors for sequential detection of Pb2+ (which is a toxic heavy metal) and dipicolinic acid (DPA) (which is a distinctive indicator biomarker of bacterial spores) with high sensitivity and selectivity. The fluorescence of FSNP is quenched because of the complex formation between Pb2+ ions and surface amide groups, however, the fluorescence is recovered in contact with DPA, resulting from the association of DPA with surface bound Pb2+ ions. FSNP-Pb2+ complexes show high sensitivity towards DPA with a low detection limit of 850 nM which is approximately seventy times lower than the infectious dosage of bacterial spores (60 μM). Lateral flow test platform was further developed to show the applicability and practicability of our system.
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Affiliation(s)
- Yagmur Nur Cetinkaya
- Department of Materials Science and Nanotechnology, Graduate School of Natural and Applied Sciences, Konya Food and Agriculture University, 42080 Konya, Turkey
| | - Onur Bulut
- Department of Bioengineering, Faculty of Engineering and Architecture, Konya Food and Agriculture University, 42080 Konya, Turkey
| | - Huseyin Avni Oktem
- Department of Biological Sciences, Middle East Technical University, 06800 Ankara, Turkey; Nanobiz Technology Inc., Gallium Block No: 27 / 218, METU Technopolis, Ankara, Turkey
| | - M Deniz Yilmaz
- Department of Basic Sciences, Faculty of Engineering, Necmettin Erbakan University, 42140 Konya, Turkey; BITAM-Science and Technology Research and Application Center, Necmettin Erbakan University, 42140 Konya, Turkey.
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2
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Rattray JE, Chakraborty A, Li C, Elizondo G, John N, Wong M, Radović JR, Oldenburg TBP, Hubert CRJ. Sensitive quantification of dipicolinic acid from bacterial endospores in soils and sediments. Environ Microbiol 2020; 23:1397-1406. [PMID: 33264453 PMCID: PMC8048543 DOI: 10.1111/1462-2920.15343] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 11/30/2020] [Indexed: 11/27/2022]
Abstract
Endospore-forming bacteria make up an important and numerically significant component of microbial communities in a range of settings including soils, industry, hospitals and marine sediments extending into the deep subsurface. Bacterial endospores are non-reproductive structures that protect DNA and improve cell survival during periods unfavourable for bacterial growth. An important determinant of endospores withstanding extreme environmental conditions is 2,6-pyridine dicarboxylic acid (i.e. dipicolinic acid, or DPA), which contributes heat resistance. This study presents an improved HPLC-fluorescence method for DPA quantification using a single 10-min run with pre-column Tb3+ chelation. Relative to existing DPA quantification methods, specific improvements pertain to sensitivity, detection limit and range, as well as the development of new free DPA and spore-specific DPA proxies. The method distinguishes DPA from intact and recently germinated spores, enabling responses to germinants in natural samples or experiments to be assessed in a new way. DPA-based endospore quantification depends on accurate spore-specific DPA contents, in particular, thermophilic spores are shown to have a higher DPA content, meaning that marine sediments with plentiful thermophilic spores may require spore number estimates to be revisited. This method has a wide range of potential applications for more accurately quantifying bacterial endospores in diverse environmental samples.
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Affiliation(s)
- Jayne E Rattray
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| | - Anirban Chakraborty
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| | - Carmen Li
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| | - Gretta Elizondo
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| | - Nisha John
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| | - Michelle Wong
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
| | - Jagoš R Radović
- Department of Geoscience, University of Calgary, Calgary, T2N 1N4, Canada
| | | | - Casey R J Hubert
- Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4, Canada
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Wunderlin T, Junier T, Roussel-Delif L, Jeanneret N, Junier P. Endospore-enriched sequencing approach reveals unprecedented diversity of Firmicutes in sediments. ENVIRONMENTAL MICROBIOLOGY REPORTS 2014; 6:631-639. [PMID: 25756117 DOI: 10.1111/1758-2229.12179] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present a method for the physical isolation of endospores from environmental samples allowing the specific targeting of endospore-forming bacteria for sequencing (endospore-enriched community). The efficiency of the method was tested on lake sediment samples. After 16S rRNA gene amplicon sequencing, the composition in the endospore-enriched community was compared with the community from untreated control samples (whole community). In the whole community, Firmicutes had a relative abundance of 8% and 19% in the two different lake sediments. In contrast, in the endospore-enriched community, Firmicutes abundance increased to 90.6% and 83.9%, respectively, confirming the efficiency of the endospore enrichment. The relative abundance of other microbial groups that form spore-like resisting states (i.e. actinobacteria, cyanobacteria and myxococcales) was below 2% in the endospore-enriched community, indicating that the method is adapted to true endospores. Representatives from two out of the three known classes of Firmicutes (Bacilli and Clostridia) were detected and supposedly asporogenic groups (e.g. Ethanoligenes and Trichococcus) could be detected. The method presented here is a leap forward for ecological studies of endospore-forming Firmicutes. It can be applied to other types of samples in order to reveal the diversity and metabolic potential of this bacterial group in the environment.
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Peng P, Wang W, Zhang L, Su S, Wang J. Absorbance characteristics of a liquid-phase gas sensor based on gas-permeable liquid core waveguides. Anal Chim Acta 2013; 804:207-14. [PMID: 24267083 DOI: 10.1016/j.aca.2013.10.020] [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: 02/19/2013] [Revised: 09/29/2013] [Accepted: 10/10/2013] [Indexed: 10/26/2022]
Abstract
The absorbance characteristics and influential factors on these characteristics for a liquid-phase gas sensor, which is based on gas-permeable liquid core waveguides (LCWs), are studied from theoretical and experimental viewpoints in this paper. According to theory, it is predicted that absorbance is proportional to the analyte concentration, sampling time, analyte diffusion coefficient, and geometric factor of this device when the depletion layer of the analyte is ignored. The experimental results are in agreement with the theoretical hypothesis. According to the experimental results, absorbance is time-dependent and increasing linearly over time after the requisite response time with a linear correlation coefficient r(2)>0.999. In the linear region, the rate of absorbance change (RAC) indicates improved linearity with sample concentration and a relative higher sensitivity than instantaneous absorbance does. By using a core liquid that is more affinitive to the analyte, reducing wall thickness and the inner diameter of the tubing, or increasing sample flow rate limitedly, the response time can be decreased and the sensitivity can be increased. However, increasing the LCW length can only enhance sensitivity and has no effect on response time. For liquid phase detection, there is a maximum flow rate, and the absorbance will decrease beyond the stated limit. Under experimental conditions, hexane as the LCW core solvent, a tubing wall thickness of 0.1 mm, a length of 10 cm, and a flow rate of 12 mL min(-1), the detection results for the aqueous benzene sample demonstrate a response time of 4 min. Additionally, the standard curve for the RAC versus concentration is RAC=0.0267c+0.0351 (AU min(-1)), with r(2)=0.9922 within concentrations of 0.5-3.0 mg L(-1). The relative error for 0.5 mg L(-1) benzene (n=6) is 7.4±3.7%, and the LOD is 0.04 mg L(-1). This research can provide theoretical and practical guides for liquid-phase gas sensor design and development based on a gas-permeable Teflon AF 2400 LCW.
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Affiliation(s)
- Pei Peng
- Department of Applied Physics, College of Science, China Agricultural University, Beijing 100083, PR China
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Nuñez V, Upadhyayula S, Millare B, Larsen JM, Hadian A, Shin S, Vandrangi P, Gupta S, Xu H, Lin AP, Georgiev GY, Vullev VI. Microfluidic Space-Domain Time-Resolved Emission Spectroscopy of Terbium(III) and Europium(III) Chelates with Pyridine-2,6-Dicarboxylate. Anal Chem 2013; 85:4567-77. [DOI: 10.1021/ac400200x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Vicente Nuñez
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
| | - Srigokul Upadhyayula
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
- Department of Biochemistry, University of California, Riverside, California 92521,
United States
| | - Brent Millare
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
| | - Jillian M. Larsen
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
| | - Ali Hadian
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
| | - Sanghoon Shin
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
| | - Prashanthi Vandrangi
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
| | - Sharad Gupta
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
| | - Hong Xu
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
| | - Adam P. Lin
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
| | - Georgi Y. Georgiev
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
| | - Valentine I. Vullev
- Department of Bioengineering
and Center for Bioengineering Research, University of California, Riverside, California 92521, United States
- Department of Biochemistry, University of California, Riverside, California 92521,
United States
- Department
of Chemistry, University of California,
Riverside, California 92521,
United States
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Eker B, Yilmaz MD, Schlautmann S, Gardeniers JGE, Huskens J. A supramolecular sensing platform for phosphate anions and an anthrax biomarker in a microfluidic device. Int J Mol Sci 2011; 12:7335-51. [PMID: 22174602 PMCID: PMC3233408 DOI: 10.3390/ijms12117335] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Revised: 10/19/2011] [Accepted: 10/20/2011] [Indexed: 12/04/2022] Open
Abstract
A supramolecular platform based on self-assembled monolayers (SAMs) has been implemented in a microfluidic device. The system has been applied for the sensing of two different analyte types: biologically relevant phosphate anions and aromatic carboxylic acids, which are important for anthrax detection. A Eu(III)-EDTA complex was bound to β-cyclodextrin monolayers via orthogonal supramolecular host-guest interactions. The self-assembly of the Eu(III)-EDTA conjugate and naphthalene β-diketone as an antenna resulted in the formation of a highly luminescent lanthanide complex on the microchannel surface. Detection of different phosphate anions and aromatic carboxylic acids was demonstrated by monitoring the decrease in red emission following displacement of the antenna by the analyte. Among these analytes, adenosine triphosphate (ATP) and pyrophosphate, as well as dipicolinic acid (DPA) which is a biomarker for anthrax, showed a strong response. Parallel fabrication of five sensing SAMs in a single multichannel chip was performed, as a first demonstration of phosphate and carboxylic acid screening in a multiplexed format that allows a general detection platform for both analyte systems in a single test run with μM and nM detection sensitivity for ATP and DPA, respectively.
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Affiliation(s)
- Bilge Eker
- Mesoscale Chemical Systems, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands; E-Mails: (B.E.); (S.S.)
| | - Mahmut Deniz Yilmaz
- Molecular Nanofabrication Group, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands; E-Mail: (M.D.Y.)
| | - Stefan Schlautmann
- Mesoscale Chemical Systems, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands; E-Mails: (B.E.); (S.S.)
| | - Johannes G. E. Gardeniers
- Mesoscale Chemical Systems, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands; E-Mails: (B.E.); (S.S.)
| | - Jurriaan Huskens
- Molecular Nanofabrication Group, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands; E-Mail: (M.D.Y.)
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Efficient inhibition of germination of coat-deficient bacterial spores by multivalent metal cations, including terbium (Tb³+). Appl Environ Microbiol 2011; 77:5536-9. [PMID: 21685163 DOI: 10.1128/aem.00577-11] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Release of dipicolinic acid (DPA) and its fluorescence with terbium (Tb(3+)) allow rapid measurement of the germination and viability of spores of Bacillus and Clostridium species. However, germination of coat-deficient Bacillus spores was strongly inhibited by Tb(3+) and some other multivalent cations. Tb(3+) also inhibited germination of coat-deficient Clostridium perfringens spores.
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Ma B, Zeng F, Zheng F, Wu S. Fluorescent detection of an anthrax biomarker based on PVA film. Analyst 2011; 136:3649-55. [DOI: 10.1039/c1an15384f] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yilmaz M, Hsu SH, Reinhoudt D, Velders A, Huskens J. Ratiometric Fluorescent Detection of an Anthrax Biomarker at Molecular Printboards. Angew Chem Int Ed Engl 2010; 49:5938-41. [DOI: 10.1002/anie.201000540] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10
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Yilmaz M, Hsu SH, Reinhoudt D, Velders A, Huskens J. Ratiometric Fluorescent Detection of an Anthrax Biomarker at Molecular Printboards. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201000540] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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11
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Li Q, Dasgupta PK, Temkin H. A time-gated fluorescence detector using a tuning fork chopper. Anal Chim Acta 2008; 616:63-8. [DOI: 10.1016/j.aca.2008.04.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2007] [Revised: 03/28/2008] [Accepted: 04/03/2008] [Indexed: 11/24/2022]
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