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Karaket R, Detsri E, Khattiya A, Monvisade P, Mathaweesansurn A. Facile construction of magnetic solid-phase extraction of polyaniline blend poly(amidoamine) dendrimers modified graphene oxide quantum dots for efficient adsorption of polycyclic aromatic hydrocarbons in environmental water. J Chromatogr A 2024; 1717:464668. [PMID: 38278132 DOI: 10.1016/j.chroma.2024.464668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 01/15/2024] [Accepted: 01/18/2024] [Indexed: 01/28/2024]
Abstract
An efficient magneto-adsorbent composed of polyaniline blend poly(amidoamine) dendrimers modified graphene oxide quantum dots and magnetic Fe3O4 particles (Fe3O4@PANI-PSS/PAMAM-QGO) for magnetic solid-phase extraction (MSPE) of polycyclic aromatic hydrocarbons (PAHs) in environmental water was synthesized. Fe3O4@PANI-PSS/PAMAM-QGO exhibited exceptional adsorption property for most PAHs analytes. The nanocomposite sorbent demonstrated a ferromagnetic behavior of 17.457 emu g-1, which is adequate for subsequent use in MSPE. Key parameters affecting the processes of adsorption and desorption, including the sorbent amount, vortex adsorption time, vortex extraction time, sample volume, a solvent for desorption and the solvent volume were all examined and optimized. The performance of MSPE using Fe3O4@PANI-PSS/PAMAM-QGO as adsorbent for four PAHs, including fluoranthene, acenaphthene, phenanthrene and pyrene were studied through high performance liquid chromatography equipped with spectrofluorometer. Under the optimal conditions, Fe3O4@PANI-PSS/PAMAM-QGO showed a wide linearity of 10-1,000 ng mL-1, low detection limit (LOD) ranging from 1.92 to 4.25 ng mL -1 and high accuracy (recoveries of 93.6-96.5 %). Enrichment factors up to 185 were achieved. Furthermore, Fe3O4@PANI-PSS/PAMAM-QGO exhibited good recyclability (10 times, RSDs ≤ 5.35%), while maintaining its high efficiency in the extraction of PAHs. The proposed method was successfully applied for environmental samples. Recoveries ranging from 81.2 to 106.2 % were obtained, indicating a low matrix effect and the robustness of the optimized MSPE method. Based on these features and under the optimal extraction conditions, Fe3O4@PANI-PSS/PAMAM-QGO was demonstrated to be a successful tool for the rapid and sensitive extraction of PAHs in the samples.
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Affiliation(s)
- Ratchanok Karaket
- Department of Chemistry, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
| | - Ekarat Detsri
- Department of Chemistry, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand; Integrated Applied Chemistry Research Unit, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
| | - Akrarath Khattiya
- Department of Chemistry, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
| | - Pathavuth Monvisade
- Department of Chemistry, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand; Polymer Synthesis and Functional Materials Research Unit, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
| | - Arjnarong Mathaweesansurn
- Department of Chemistry, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand; Applied Analytical Chemistry Research Unit, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
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Golubewa L, Kulahava T, Klimovich A, Rutkauskas D, Matulaitiene I, Karpicz R, Belko N, Mogilevtsev D, Kavalenka A, Fetisova M, Karvinen P, Svirko Y, Kuzhir P. Visualizing hypochlorous acid production by human neutrophils with fluorescent graphene quantum dots. Nanotechnology 2021; 33:095101. [PMID: 34818632 DOI: 10.1088/1361-6528/ac3ce4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 11/24/2021] [Indexed: 06/13/2023]
Abstract
In living organisms, redox reactions play a crucial role in the progression of disorders accompanied by the overproduction of reactive oxygen and reactive chlorine species, such as hydrogen peroxide and hypochlorous acid, respectively. We demonstrate that green fluorescence graphene quantum dots (GQDs) can be employed for revealing the presence of the hypochlorous acid in aqueous solutions and cellular systems. Hypochlorous acid modifies the oxygen-containing groups of the GQD, predominantly opens epoxide ring C-O-C, forms excessive C=O bonds and damages the carbonic core of GQDs. These changes, which depend on the concentration of the hypochlorous acid and exposure time, manifest themselves in the absorbance and fluorescence spectra of the GQD, and in the fluorescence lifetime. We also show that the GQD fluorescence is not affected by hydrogen peroxide. This finding makes GQDs a promising sensing agent for selective detecting reactive chlorine species produced by neutrophils. Neutrophils actively accumulate GQDs allowing to visualize cells and to examine the redox processes via GQDs fluorescence. At high concentrations GQDs induce neutrophil activation and myeloperoxidase release, leading to the disruption of GQD structure by the produced hypochlorous acid. This makes the GQDs a biodegradable material suitable for various biomedical applications.
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Affiliation(s)
- Lena Golubewa
- Department of Molecular Compounds Physics, State Research Institute Center for Physical Sciences and Technology, Vilnius, 10257, Lithuania
- Laboratory of Nanoelectromagnetics, Institute for Nuclear Problems of Belarusian State University, Minsk, 220006, Belarus
| | - Tatsiana Kulahava
- Laboratory of Nanoelectromagnetics, Institute for Nuclear Problems of Belarusian State University, Minsk, 220006, Belarus
| | - Aliona Klimovich
- Department of Organic Chemistry, State Research Institute Center for Physical Sciences and Technology, Vilnius, 10257, Lithuania
| | - Danielis Rutkauskas
- Department of Molecular Compounds Physics, State Research Institute Center for Physical Sciences and Technology, Vilnius, 10257, Lithuania
| | - Ieva Matulaitiene
- Department of Organic Chemistry, State Research Institute Center for Physical Sciences and Technology, Vilnius, 10257, Lithuania
| | - Renata Karpicz
- Department of Molecular Compounds Physics, State Research Institute Center for Physical Sciences and Technology, Vilnius, 10257, Lithuania
| | - Nikita Belko
- Laboratory of Spectroscopy, A. N. Sevchenko Institute of Applied Physical Problems of Belarusian State University, Minsk, 220045, Belarus
- Center of Quantum Optics and Quantum Information, B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus, Minsk, 220072, Belarus
| | - Dmitri Mogilevtsev
- Center of Quantum Optics and Quantum Information, B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus, Minsk, 220072, Belarus
| | - Alena Kavalenka
- Department of Biophysics, Physics Faculty, Belarusian State University, Minsk, 220030, Belarus
| | - Marina Fetisova
- Institute of Photonics, Department of Physics and Mathematics, University of Eastern Finland, Joensuu, 80101, Finland
| | - Petri Karvinen
- Institute of Photonics, Department of Physics and Mathematics, University of Eastern Finland, Joensuu, 80101, Finland
| | - Yuri Svirko
- Institute of Photonics, Department of Physics and Mathematics, University of Eastern Finland, Joensuu, 80101, Finland
| | - Polina Kuzhir
- Institute of Photonics, Department of Physics and Mathematics, University of Eastern Finland, Joensuu, 80101, Finland
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Qiao Z, Cai Q, Fu Y, Lei C, Yang W. Visual and quantitative detection of E. coli O157:H7 by coupling immunomagnetic separation and quantum dot-based paper strip. Anal Bioanal Chem 2021; 413:4417-4426. [PMID: 34013400 DOI: 10.1007/s00216-021-03395-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 04/21/2021] [Accepted: 05/06/2021] [Indexed: 10/21/2022]
Abstract
Simple and visual quantitative detection of foodborne pathogens can effectively reduce the outbreaks of foodborne diseases. Herein, we developed a simple and sensitive quantum dot (QD)-based paper device for visual and quantitative detection of Escherichia coli (E. coli) O157:H7 based on immunomagnetic separation and nanoparticle dissolution-triggered signal amplification. In this study, E. coli O157:H7 was magnetically separated and labeled with silver nanoparticles (AgNPs), and the AgNP labels can be converted into millions of Ag ions, which subsequently quench the fluorescence of QDs in the paper strip, which along with the readout can be visualized and quantified by the change in length of fluorescent quenched band. Owing to the high capture efficiency and effective signal amplification, as low as 500 cfu mL-1 of E. coli O157:H7 could be easily detected by naked eyes. Furthermore, this novel platform was successfully applied to detect E. coli O157:H7 in spiked milk samples with good accuracy, indicating its potential in the detection of foodborne pathogens in real samples.
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Affiliation(s)
- Zhaohui Qiao
- College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, 315800, Zhejiang, China
| | - Qiqi Cai
- College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, 315800, Zhejiang, China
| | - Yingchun Fu
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Chunyang Lei
- State Key Laboratory of Chem/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, Zhejiang, China.
| | - Wenge Yang
- College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, 315800, Zhejiang, China.
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Amoruso G, Liu J, Polak DW, Tiwari K, Jones MR, Oliver TAA. High-Efficiency Excitation Energy Transfer in Biohybrid Quantum Dot-Bacterial Reaction Center Nanoconjugates. J Phys Chem Lett 2021; 12:5448-5455. [PMID: 34081477 DOI: 10.1021/acs.jpclett.1c01407] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Reaction centers (RCs) are the pivotal component of natural photosystems, converting solar energy into the potential difference between separated electrons and holes that is used to power much of biology. RCs from anoxygenic purple photosynthetic bacteria such as Rhodobacter sphaeroides only weakly absorb much of the visible region of the solar spectrum, which limits their overall light-harvesting capacity. For in vitro applications such as biohybrid photodevices, this deficiency can be addressed by effectively coupling RCs with synthetic light-harvesting materials. Here, we studied the time scale and efficiency of Förster resonance energy transfer (FRET) in a nanoconjugate assembled from a synthetic quantum dot (QD) antenna and a tailored RC engineered to be fluorescent. Time-correlated single-photon counting spectroscopy of biohybrid conjugates enabled the direct determination of FRET from QDs to attached RCs on a time scale of 26.6 ± 0.1 ns and with a high efficiency of 0.75 ± 0.01.
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Affiliation(s)
- Giordano Amoruso
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Juntai Liu
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | - Daniel W Polak
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Kavita Tiwari
- School of Biochemistry, University of Bristol, Biomedical Sciences Building, University Walk, Bristol BS8 1TD, U.K
| | - Michael R Jones
- School of Biochemistry, University of Bristol, Biomedical Sciences Building, University Walk, Bristol BS8 1TD, U.K
| | - Thomas A A Oliver
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
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Ding Z, Dou X, Wang C, Feng G, Xie J, Zhang X. Ratiometric pH sensing by fluorescence resonance energy transfer-based hybrid semiconducting polymer dots in living cells. Nanotechnology 2021; 32:245502. [PMID: 33636714 DOI: 10.1088/1361-6528/abea38] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 02/26/2021] [Indexed: 05/20/2023]
Abstract
Intracellular pH plays a significant role in all cell activities. Due to their precise imaging capabilities, fluorescent probes have attracted much attention for the investigation of pH-regulated processes. Detecting intracellular pH values with high throughput is critical for cell research and applications. In this work, hybrid semiconducting polymer dots (Pdots) were developed and characterized and were applied for cell imaging and exclusive ratiometric sensing of intracellular pH values. The reported Pdots were prepared by blending a synthesized block polymer (POMF) and a semiconducting polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEHPPV) to construct a fluorescence resonance energy transfer system for ratiometric sensing. Pdots showed many advantages, including high brightness, excellent photostability and biocompatibility, giving the pH probe high sensitivity and good stability. Our results proved the capability of POMF-MEHPPV Pdots for the detection of pH in living cells.
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Affiliation(s)
- Zhaoyang Ding
- College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, People's Republic of China
- Cancer Centre and Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, Taipa, Macau SAR 999078, People's Republic of China
| | - Xilin Dou
- College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, People's Republic of China
| | - Chunfei Wang
- Cancer Centre and Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, Taipa, Macau SAR 999078, People's Republic of China
| | - Gang Feng
- Cancer Centre and Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, Taipa, Macau SAR 999078, People's Republic of China
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Biomedical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, People's Republic of China
| | - Jing Xie
- College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, People's Republic of China
| | - Xuanjun Zhang
- Cancer Centre and Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, Taipa, Macau SAR 999078, People's Republic of China
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Reshma VG, Sabareeswaran A, Rajeev KS, Mohanan PV. In vitro and In vivo toxicity analysis of zinc selenium/zinc sulfide (ZnSe/ZnS) quantum dots. Food Chem Toxicol 2020; 145:111718. [PMID: 32890689 DOI: 10.1016/j.fct.2020.111718] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 08/17/2020] [Accepted: 08/28/2020] [Indexed: 11/17/2022]
Abstract
Despite the versatility of quantum dots (QDs) in optoelectronics and biomedical field, their toxicity risks remain a considerable hindrance for clinical applications. Cytotoxicity of Cadmium containing QDs is well documented and reveals that they are toxic to cells. Reports suggest that the presence of toxic elements at the QD core (e.g., cadmium, selenium) is responsible for its toxicity in in vivo and in vitro levels. Hence, here the toxicity of heavy metal free ZnSe/ZnS QDs on two scenarios were assessed, (i) HEK cells as in vitro system and (ii) Swiss Albino mice as in vivo model. Before toxicity analysis, QDs subjected to various optical and physico-chemical characterization methods such as absorption and emission spectra analysis, observation under U.V light, TEM, DLS, Zeta potential, FTIR, Raman and XPS spectra, ICP-OES, TGA and DTG curve. It is very necessary to characterize the synthesized QDs because their toxicity greatly influenced by the physico-chemical properties. On checking the vulnerability of HEK cells on exposure to ZnSe/ZnS QDs, the obtained results disclose that ZnSe/ZnS QDs showed merest impact on cellular viability at a concentration less than 100 μg/ml. Acute toxicity of 10 mg/kg ZnSe/ZnS QDs was studied in mice and no clinical or behavioural changes were observed. It did not induce any changes in haematological parameters and any loss of body or organ weight. Moderate pathological changes were evident only in the liver, all others organs like kidney, spleen and brain did not show any manifestations of toxicity. Current work lays substantial bedrock for safe biomedical and environmental application of ZnSe/ZnS QDs in near future.
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Affiliation(s)
- V G Reshma
- Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Poojapura, Trivandrum, 695 012, Kerala, India
| | - A Sabareeswaran
- Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Poojapura, Trivandrum, 695 012, Kerala, India
| | - K S Rajeev
- Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology Industrial Estate PO, Trivandrum, 695019, India
| | - P V Mohanan
- Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Poojapura, Trivandrum, 695 012, Kerala, India.
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Fujii M, Minami A, Sugimoto H. Precise size separation of water-soluble red-to-near-infrared-luminescent silicon quantum dots by gel electrophoresis. Nanoscale 2020; 12:9266-9271. [PMID: 32313916 DOI: 10.1039/d0nr02764b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Gel electrophoresis, which is a standard method for separation and analysis of macromolecules such as DNA, RNA and proteins, is applied for the first time to silicon (Si) quantum dots (QDs) for size separation. In the Si QDs studied, boron (B) and phosphorus (P) are simultaneously doped. Codoping induces a negative potential on the surface of a Si QD and makes it dispersible in water. Si QDs with different B and P concentrations and grown at different temperatures (950 °C-1200 °C) are studied. It is shown that native polyacrylamide gel electrophoresis can separate codoped Si QDs by size. The capability of gel electrophoresis to immobilize size-separated QDs in a solid matrix makes detailed analyses of size-purified Si QDs possible. For example, the photoluminescence (PL) studies of the dried gel of Si QDs grown at 1100 °C demonstrate that a PL spectrum of a Si QD solution with the PL maximum around 1.4 eV can be separated into more than 15 spectra with the PL maximum changing from 1.2 to 1.8 eV depending on the migration distance. It is found that the relationship between the PL peak energy and the migration distance depends on the growth temperature of Si QDs as well as the B and P concentration. For all the samples with different impurity concentrations and grown at different temperatures, a clear trend is observed in the relationship between the full width at half maximum (FWHM) and the peak energy of the PL spectra in a wide energy range. The FWHM increases with the increasing peak energy and it is nearly twice larger than those observed for undoped Si QDs. The large PL FWHM of codoped Si QDs suggests that excitons are further localized in codoped Si QDs due to the existence of charged impurities.
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Affiliation(s)
- Minoru Fujii
- Department of Electrical and Electronic Engineering, Kobe University, 657-8501 Kobe, Japan.
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Zhang ZQ, Yao WJ, Qiao LL, Yang X, Shi J, Zhao MX. A Lysosome-Targetable Fluorescence Probe Based on L-Cysteine-Polyamine-Morpholine-Modified Quantum Dots for Imaging in Living Cells. Int J Nanomedicine 2020; 15:1611-1622. [PMID: 32210555 PMCID: PMC7069590 DOI: 10.2147/ijn.s234927] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 02/24/2020] [Indexed: 12/16/2022] Open
Abstract
PURPOSE Quantum dots (QDs) are used as fluorescent probes due to their high fluorescence intensity, longevity of fluorescence, strong light-resistant bleaching ability and high light stability. Therefore, we explore a more precise probe that can target an organelle. METHODS In the current study, a new class of fluorescence probes were developed using QDs capped with 4 different L-cysteine-polyamine-morpholine linked by mercapto groups. Ligands were characterised by Electrospray ionization mass spectrometry (ESI-MS), H-Nuclear Magnetic Resonance (1H NMR) spectroscopy, and 13C NMR spectroscopy. Modified QDs were characterized by Transmission Electron Microscope (TEM), Ultraviolet and visible spectrophotometry (UV-Vis), and fluorescence microscopy. And the biological activity of modified QDs was explored by using MTT assay with HeLa, SMMC-7721 and HepG2 cells. The fluorescence imaging of modified QDs was obtained by confocal laser scanning fluorescence microscopy (CLSM). RESULTS Synthesized QDs ranged between 4 to 5 nm and had strong optical emission properties. UV-Vis and fluorescence spectra demonstrated that the cysteine-polyamine-morpholine were successfully incorporated into QD nanoparticles. The MTT results demonstrated that modified QDs had lesser cytotoxicity when compared to unmodified QDs. In addition, modified QDs had strong fluorescence intensity in HeLa cells and targeted lysosomes of HeLa cells. CONCLUSION This study demonstrates the modified QDs efficiently entered cells and could be used as a potential lysosome-targeting fluorescent probe.
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Affiliation(s)
- Zhi-Qiang Zhang
- Key Laboratory of Natural Medicine and Immune Engineering, Henan University, Kaifeng475004, People’s Republic of China
| | - Wen-Jing Yao
- Key Laboratory of Natural Medicine and Immune Engineering, Henan University, Kaifeng475004, People’s Republic of China
| | - Lu-Lu Qiao
- Key Laboratory of Natural Medicine and Immune Engineering, Henan University, Kaifeng475004, People’s Republic of China
| | - Xiaojing Yang
- Key Laboratory of Natural Medicine and Immune Engineering, Henan University, Kaifeng475004, People’s Republic of China
| | - Jiahua Shi
- Key Laboratory of Natural Medicine and Immune Engineering, Henan University, Kaifeng475004, People’s Republic of China
| | - Mei-Xia Zhao
- Key Laboratory of Natural Medicine and Immune Engineering, Henan University, Kaifeng475004, People’s Republic of China
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Yang D, Li J, Cheng Y, Wan F, Jia R, Wang Y. Compound repair effect of carbon dots and Fe 2+ on iron deficiency in Cucumis melon L. Plant Physiol Biochem 2019; 142:137-142. [PMID: 31279861 DOI: 10.1016/j.plaphy.2019.06.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 06/27/2019] [Accepted: 06/27/2019] [Indexed: 06/09/2023]
Abstract
Iron-deficiency is one of the most widespread micronutrient deficiency faced by plants, and proper iron supplementation is essential for the growth of crops and for people to obtain iron from food. In order to explore new methods of iron supplementation, we studied the repair effect of CDs on iron-deficient (Cucumis melo L.) muskmelon. Iron-deficient muskmelons were treated with different concentrations of Fe2+, CDs and their complexes. The results showed that CDs significantly increased the iron transport rate and it is noteworthy that 75 mg/L CDs increased the iron transport rate of 0.7 mg/L Fe2+ by 134%. The compound treatment reduced the oxidative stress caused by iron deficiency, such as the CAT activity in the leaves of the compound treatment group was 10%-50% lower than that of the iron supplementation alone. Fluorescent imaging results of melon proved that CDs entered into the muskmelon seedlings. In combination with the above results and the adsorption of CDs, we speculated that the way CDs promoted iron absorption and transport was most likely to combine with Fe2+ and co-transport in melon, which changed the content of reactive oxygen species and other free radicals, thus causing changes of physiological state of melon. This study confirmed that CDs had a positive effect on the iron deficiency of muskmelon, and improved the growth of muskmelon under the condition of iron deficiency, which has a certain reference value for further optimization of iron supplementation solution.
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Affiliation(s)
- Daoyong Yang
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Junli Li
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070, PR China.
| | - Yuxuan Cheng
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Fengting Wan
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Ruiliang Jia
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Yunqiang Wang
- Institute of Economic Crops, Hubei Academy of Agricultural Science, Wuhan, 430064, PR China; Vegetable Germplasm Innovation and Genetic Improvement Key Laboratory of Hubei Province, Hubei Academy of Agricultural Sience, Wuhan, 430064, PR China.
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Liu H, Deng X, Tong S, He C, Cheng H, Zhuang Z, Gan M, Li J, Xie W, Qiu P, Wang K. In Vivo Deep-Brain Structural and Hemodynamic Multiphoton Microscopy Enabled by Quantum Dots. Nano Lett 2019; 19:5260-5265. [PMID: 31268725 DOI: 10.1021/acs.nanolett.9b01708] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Visualizing deep-brain vasculature and hemodynamics is key to understanding brain physiology and pathology. Among the various adopted imaging modalities, multiphoton microscopy (MPM) is well-known for its deep-brain structural and hemodynamic imaging capability. However, the largest imaging depth in MPM is limited by signal depletion in the deep brain. Here we demonstrate that quantum dots are an enabling material for significantly deeper structural and hemodynamic MPM in mouse brain in vivo. We characterized both three-photon excitation and emission parameters for quantum dots: the measured three-photon cross sections of quantum dots are 4-5 orders of magnitude larger than those of conventional fluorescent dyes excited at the 1700 nm window, while the three-photon emission spectrum measured in the circulating blood in vivo shows a slight red shift and broadening compared with ex vivo measurement. On the basis of these measured results, we further demonstrate both structural and hemodynamic three-photon microscopy in the mouse brain in vivo labeled by quantum dots, at record depths among all MPM modalities at all demonstrated excitation wavelengths.
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Affiliation(s)
- Hongji Liu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 , China
| | - Xiangquan Deng
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 , China
| | - Shen Tong
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 , China
| | - Chen He
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 , China
| | - Hui Cheng
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 , China
| | - Ziwei Zhuang
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 , China
| | - Mengyao Gan
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 , China
| | - Jia Li
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 , China
| | - Weixin Xie
- College of Electronics and Information Engineering , Shenzhen University , Shenzhen , 518060 , China
| | - Ping Qiu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 , China
| | - Ke Wang
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 , China
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Abstract
As our ability to synthesize and modify nanoobjects has improved, efforts to explore nanotechnology for diagnostic purposes have gained momentum. The variety of nanoobjects, especially those with polyvalent properties, displays a wide range of practical and unique properties well suited for applications in various diagnostics. This review briefly covers the broad scope of multivalent nanoobjects and their use in diagnostics, ranging from ex vivo assays and biosensors to in vivo imaging. The nanoobjects discussed here include silica nanoparticles, gold nanoparticles, quantum dots, carbon dots, fullerenes, polymers, dendrimers, liposomes, nanowires, and nanotubes. In this review, we describe recent reports of novel applications of these various nanoobjects, particularly as polyvalent entities designed for diagnostics.
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Affiliation(s)
- David T Omstead
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA;
| | - Jenna Sjoerdsma
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA;
| | - Basar Bilgicer
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA;
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
- Advanced Diagnostics and Therapeutics Initiative, University of Notre Dame, Notre Dame, Indiana 46556, USA
- Mike and Josie Harper Cancer Research Institute, University of Notre Dame, South Bend, Indiana 46617, USA
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13
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Carrillo-Carrion C, Bocanegra AI, Arnaiz B, Feliu N, Zhu D, Parak WJ. Triple-Labeling of Polymer-Coated Quantum Dots and Adsorbed Proteins for Tracing their Fate in Cell Cultures. ACS Nano 2019; 13:4631-4639. [PMID: 30875468 DOI: 10.1021/acsnano.9b00728] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Colloidal CdSe/ZnS quantum dots were water solubilized by overcoating with an amphiphilic polymer. Human serum albumin (HSA) as a model protein was either adsorbed or chemically linked to the surface of the polymer-coated quantum dots. As the quantum dots are intrinsically fluorescent, and as the polymer coating and the HSA were fluorescent labeled, the final nanoparticle had three differently fluorescent components: the quantum dot core, the polymer shell, and the human serum albumin corona. Cells were incubated with these hybrid nanoparticles, and after removal of non-internalized nanoparticles, exocytosis of the three components of the nanoparticles was observed individually by flow cytometry and confocal microscopy. The data indicate that HSA is partly transported with the underlying polymer-coated quantum dots into cells. Upon desorption of proteins, those initially adsorbed to the quantum dots remain longer inside cells compared to free proteins. Part of the polymer shell is released from the quantum dots by enzymatic degradation, which is on a slower time scale than protein desorption. Data are quantitatively analyzed, and experimental pitfalls, such as the impact of cell proliferation and fluorescence quenching, are discussed.
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Affiliation(s)
- Carolina Carrillo-Carrion
- CIC biomaGUNE , 20014 San Sebastian , Spain
- Centro Singular de Investigación en Química Biológica y Materiales Moleculares (CiQUS) y Departamento de Física de Partículas , Universidad de Santiago de Compostela , 15782 Santiago de Compostela , Spain
| | | | | | - Neus Feliu
- Fachbereich Physik und Chemie , Universität Hamburg , 22607 Hamburg , Germany
| | - Dingcheng Zhu
- Fachbereich Physik und Chemie , Universität Hamburg , 22607 Hamburg , Germany
| | - Wolfgang J Parak
- CIC biomaGUNE , 20014 San Sebastian , Spain
- Fachbereich Physik und Chemie , Universität Hamburg , 22607 Hamburg , Germany
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Hu J, Lin W, Lin B, Wu K, Fan H, Yu Y. Persistent DNA methylation changes in zebrafish following graphene quantum dots exposure in surface chemistry-dependent manner. Ecotoxicol Environ Saf 2019; 169:370-375. [PMID: 30466017 DOI: 10.1016/j.ecoenv.2018.11.053] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 10/31/2018] [Accepted: 11/13/2018] [Indexed: 05/20/2023]
Abstract
Modified nano-graphene quantum dots (M-GQDs) are widely used in bioimaging, drug delivery, and chemical engineering. Because M-GQDs could induce reactive oxygen species and DNA damage, we hypothesized that M-GQDs modulate DNA methylation. To test this hypothesis, zebrafish were exposed to reduced, hydroxylated, or aminated GQDs (graphene quantum dots) at different concentrations for 7 days; global DNA methylation in liver, gill, and intestine was then studied. M-GQDs induced global DNA hypermethylation in various tissues in a dose-dependent manner. The global DNA methylation of reduced and aminated GQDs exposure showed a significant increase in intestines even at low concentrations (2 mg/L), suggesting that intestines are the main target for these two M-GQDs. The effects of global DNA methylation were evaluated 14 days after exposure had ceased. DNA methylation in the livers of exposure groups was significantly higher than in control zebrafish. Global DNA methylation increased in livers of zebrafish even after exposure to aminated GQDs (2 mg/L) had ceased, indicating a more complex mechanism of DNA methylation deregulation. The present results showed that chemical groups in the surface of GQDs are a critical factor for modulating DNA methylation.
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Affiliation(s)
- Junjie Hu
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, Guangdong, PR China
| | - Wenting Lin
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, Guangdong, PR China; School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, PR China
| | - Boji Lin
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, Guangdong, PR China
| | - Kangming Wu
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, Guangdong, PR China
| | - Hongbo Fan
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, Guangdong, PR China
| | - Yingxin Yu
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, Guangdong, PR China.
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15
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Cai Q, Meng H, Liu Y, Li Z. Fluorometric determination of glucose based on a redox reaction between glucose and aminopropyltriethoxysilane and in-situ formation of blue-green emitting silicon nanodots. Mikrochim Acta 2019; 186:78. [PMID: 30627875 DOI: 10.1007/s00604-018-3189-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 12/14/2018] [Indexed: 12/17/2022]
Abstract
A method is described for fluorometric detection of glucose. It is based on the finding that silicon nanodots (SNDs) are formed from glucose and aminopropyltriethoxysilane (APTES) under mild experimental conditions. The SNDs thus formed have an average diameter of ∼2 nm, exhibit good water dispersibility, blue fluorescence (with excitation/emission maxima at 410/475 nm), broad pH tolerance, and are photostable. The assay was applied to the quantification of glucose with high sensitivity, good specificity, and over a wide detection range (from 10 μM to 0.9 mM). It was applied to the determination of glucose in spiked serum samples and gave satisfactory results and recoveries. Graphical abstract Schematic presentation of serum glucose detection based on a redox reaction between glucose and aminopropyltriethoxysilane and in-situ formation of blue-green emitting silicon nanodots.
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Affiliation(s)
- Qiyong Cai
- Institute of Chemical Biology and Nanomedicine (ICBN), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, People's Republic of China.
| | - Hongmin Meng
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Yeru Liu
- Institute of Chemical Biology and Nanomedicine (ICBN), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, People's Republic of China
| | - Zhaohui Li
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, People's Republic of China.
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16
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Modlitbová P, Pořízka P, Novotný K, Drbohlavová J, Chamradová I, Farka Z, Zlámalová-Gargošová H, Romih T, Kaiser J. Short-term assessment of cadmium toxicity and uptake from different types of Cd-based Quantum Dots in the model plant Allium cepa L. Ecotoxicol Environ Saf 2018; 153:23-31. [PMID: 29407734 DOI: 10.1016/j.ecoenv.2018.01.044] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 12/18/2017] [Accepted: 01/22/2018] [Indexed: 06/07/2023]
Abstract
We report on the toxicity and bioaccumulation of three different types of Cd-based quantum dots (QDs), dispersed in aqueous medium, for a model plant Allium cepa L. It is believed that encapsulation of nanoparticles should reduce their toxicity and increase their stability in different environments; in this work we studied how QD encapsulation affects their phytotoxicity. Core, core/shell, and core/shell/shell QDs (CdTe, CdTe/ZnS, and CdTe/CdS/ZnS QDs capped by 2-mercaptopropionic acid) were tested and CdCl2 was used as a positive control. After 24-h and 72-h exposure, total Cd content (MCd) and bioaccumulation factors (BAFs) were determined in all parts of A. cepa plants (roots, bulb, shoot), and the total length of the root system was monitored as a toxicity end-point. Measurements of total Cd content versus free Cd2+ content (with Differential Pulse Voltammetry, DPV) in exposure media showed differences in chemical stability of the three QD types. Correspondingly, selected QDs showed different toxicity for A. cepa and different Cd bioaccumulation patterns. CdTe QDs were the most toxic; their effect was similar to CdCl2 due to the release of free Cd2+, which was confirmed by the DPV measurements. Plants exposed to CdTe QDs also bioaccumulated the most Cd among all QD exposure groups. CdTe/ZnS QDs showed no toxicity and very low bioaccumulation of Cd in A. cepa; the main source of measured Cd in the plants were QDs adsorbed on their roots, which was confirmed by fluorescence microscopy. On the contrary, CdTe/CdS/ZnS QD toxicity and bioaccumulation patterns were similar to those of CdTe QDs and pointed to unstable CdS/ZnS shells.
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Affiliation(s)
- Pavlína Modlitbová
- Central European Institute of Technology (CEITEC) Brno University of Technology, Technická 3058/10, 616 00 Brno, Czech Republic.
| | - Pavel Pořízka
- Central European Institute of Technology (CEITEC) Brno University of Technology, Technická 3058/10, 616 00 Brno, Czech Republic
| | - Karel Novotný
- Central European Institute of Technology (CEITEC) Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Jana Drbohlavová
- Central European Institute of Technology (CEITEC) Brno University of Technology, Technická 3058/10, 616 00 Brno, Czech Republic
| | - Ivana Chamradová
- Central European Institute of Technology (CEITEC) Brno University of Technology, Technická 3058/10, 616 00 Brno, Czech Republic
| | - Zdeněk Farka
- Central European Institute of Technology (CEITEC) Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Helena Zlámalová-Gargošová
- Faculty of Chemistry - The Institute of Chemistry and Technology of Environmental Protection, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic
| | - Tea Romih
- SEYENS Information Solutions and Education Ltd., Krimska ulica 20, 1000 Ljubljana, Slovenia
| | - Jozef Kaiser
- Central European Institute of Technology (CEITEC) Brno University of Technology, Technická 3058/10, 616 00 Brno, Czech Republic
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17
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Efros AL, Delehanty JB, Huston AL, Medintz IL, Barbic M, Harris TD. Evaluating the potential of using quantum dots for monitoring electrical signals in neurons. Nat Nanotechnol 2018; 13:278-288. [PMID: 29636589 DOI: 10.1038/s41565-018-0107-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Accepted: 02/26/2018] [Indexed: 06/08/2023]
Abstract
Success in the projects aimed at providing an advanced understanding of the brain is directly predicated on making critical advances in nanotechnology. This Perspective addresses the unique interface of neuroscience and nanomaterials by considering the foundational problem of sensing neuron membrane voltage and offers a potential solution that may be facilitated by a prototypical nanomaterial. Despite substantial improvements, the visualization of instantaneous voltage changes within individual neurons, whether in cell culture or in vivo, at both the single-cell and network level at high speed remains complex and problematic. The unique properties of semiconductor quantum dots (QDs) have made them powerful fluorophores for bioimaging. What is not widely appreciated, however, is that QD photoluminescence is exquisitely sensitive to proximal electric fields. This property should be suitable for sensing voltage changes that occur in the active neuronal membrane. Here, we examine the potential role of QDs in addressing the important challenge of real-time optical voltage imaging.
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Affiliation(s)
- Alexander L Efros
- Center for Computational Materials Science (6390), US Naval Research Laboratory, Washington, DC, USA.
| | - James B Delehanty
- Center for Bio/Molecular Science and Engineering (6900), US Naval Research Laboratory, Washington, DC, USA
| | - Alan L Huston
- Optical Sciences Division (5611), US Naval Research Laboratory, Washington, DC, USA
| | - Igor L Medintz
- Center for Bio/Molecular Science and Engineering (6900), US Naval Research Laboratory, Washington, DC, USA
| | - Mladen Barbic
- Applied Physics and Instrumentation Group, Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA, USA
| | - Timothy D Harris
- Applied Physics and Instrumentation Group, Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA, USA.
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18
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Wang Y, Nowack B. Dynamic probabilistic material flow analysis of nano-SiO 2, nano iron oxides, nano-CeO 2, nano-Al 2O 3, and quantum dots in seven European regions. Environ Pollut 2018; 235:589-601. [PMID: 29331892 DOI: 10.1016/j.envpol.2018.01.004] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 11/13/2017] [Accepted: 01/02/2018] [Indexed: 06/07/2023]
Abstract
Static environmental exposure assessment models based on material flow analysis (MFA) have previously been used to estimate flows of engineered nanomaterials (ENMs) to the environment. However, such models do not account for changes in the system behavior over time. Dynamic MFA used in this study includes the time-dependent development of the modelling system by considering accumulation of ENMs in stocks and the environment, and the dynamic release of ENMs from nano-products. In addition, this study also included regional variations in population, waste management systems, and environmental compartments, which subsequently influence the environmental release and concentrations of ENMs. We have estimated the flows and release concentrations of nano-SiO2, nano-iron oxides, nano-CeO2, nano-Al2O3, and quantum dots in the EU and six geographical sub-regions in Europe (Central Europe, Northern Europe, Southern Europe, Eastern Europe, South-eastern Europe, and Switzerland). The model predicts that a large amount of ENMs are accumulated in stocks (not considering further transformation). For example, in the EU 2040 Mt of nano-SiO2 are stored in the in-use stock, 80,400 tonnes have been accumulated in sediments and 65,600 tonnes in natural and urban soil from 1990 to 2014. The magnitude of flows in waste management processes in different regions varies because of differences in waste handling. For example, concentrations in landfilled waste are lowest in South-eastern Europe due to dilution by the high amount of landfilled waste in the region. The flows predicted in this work can serve as improved input data for mechanistic environmental fate models and risk assessment studies compared to previous estimates using static models.
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Affiliation(s)
- Yan Wang
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Technology and Society Laboratory, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Bernd Nowack
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Technology and Society Laboratory, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland.
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19
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Li R, Sun H, Wang S, Wang Y, Yu K. Retention of CdS/ZnS Quantum Dots (QDs) on the Root Epidermis of Woody Plant and Its Implications by Benzo[a]pyrene: Evidence from the in Situ Synchronous Nanosecond Time-Resolved Fluorescence Spectra Method. J Agric Food Chem 2018; 66:814-821. [PMID: 29300478 DOI: 10.1021/acs.jafc.7b04258] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The retention of CdS/ZnS QDs on the epidermis has been confirmed to be one of the core procedures during the root uptake process. However, the retention mechanisms of QDs on the epidermis of woody plant were poorly understood for lacking of an appropriate QD quantitative method. In this study, a novel method for in situ determination of CdS/ZnS QDs retained on the root epidermis was established using synchronous nanosecond time-resolved fluorescence spectroscopy. No correlations between Kf values of oleylamine-CdS/ZnS QDs retained on the epidermal tissues and the surface/bulk composition of mangrove root were observed (p > 0.05) due to the existence of endocytosis mechanisms during the QD uptake processes. Moreover, the difference of the CdS/ZnS QDs in water and further translocated to xylem/phloem of root rather than the combination with cell wall/membranes was the predominant reason that caused the Kf values to follow the sequence of PEG-COOH-CdS/ZnS QDs < PEG-NH2-CdS/ZnS QDs ≪ oleylamine-CdS/ZnS QDs.
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Affiliation(s)
- Ruilong Li
- School of Marine Sciences, Guangxi University , Nanning 530004, P. R. China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University , Nanning 530004, P. R. China
- Coral Reef Research Center of China, Guangxi University , Nanning 530004, P. R. China
| | - Haifeng Sun
- College of Environment and Resource, Shanxi University , Taiyuan 030006, P. R. China
| | - Shaopeng Wang
- School of Marine Sciences, Guangxi University , Nanning 530004, P. R. China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University , Nanning 530004, P. R. China
- Coral Reef Research Center of China, Guangxi University , Nanning 530004, P. R. China
| | - Yinghui Wang
- School of Marine Sciences, Guangxi University , Nanning 530004, P. R. China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University , Nanning 530004, P. R. China
- Coral Reef Research Center of China, Guangxi University , Nanning 530004, P. R. China
| | - Kefu Yu
- School of Marine Sciences, Guangxi University , Nanning 530004, P. R. China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University , Nanning 530004, P. R. China
- Coral Reef Research Center of China, Guangxi University , Nanning 530004, P. R. China
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20
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Chen X, Ok YS, Mohan D, Pittman CU, Dou X. The stability and removal of water-dispersed CdSe/CdS core-shell quantum dots from water. Chemosphere 2017; 185:926-933. [PMID: 28747004 DOI: 10.1016/j.chemosphere.2017.07.083] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 06/15/2017] [Accepted: 07/16/2017] [Indexed: 06/07/2023]
Abstract
The increasingly wide use of semiconductor nanocrystals inevitably leads to their release into aquatic environment. The aggregation behaviors of 3-mercaptopropionic acid-capped CdSe/CdS core-shell quantum dots (MPA-QDs) under various water chemistry conditions were examined and their removal using Fe3+ and Al3+ coagulants was evaluated. Cationic species rather than concentrations affected the stability of MPA-QDs. Adding 2 mM Ca2+ led to a much larger ζ-potential decrease and particle size increase than adding 150 mM K+ at each tested solution pH. This indicated that complexation and depletion of surface-bound carboxyl groups by divalent Ca2+ has a more pronounced effect than compression of the electrical double layer by high concentrations of monovalent K+. The presence of humic acid increased the stability of MPA-QDs, which might increase negative surface charging via overcoating or bind to the surface of MPA-QDs. The nanoparticles exhibited similar aggregation kinetics patterns in tap water and seawater, but varying patterns in the lake water because of the co-existence of 2.3 mM total of Ca2+ and Mg2+. MPA-QDs (5 mg L-1) were readily coagulated by 2.4 mM Al3+ or 1.2 mM Fe3+ in tap water. Al3+ and Fe3+ can bind with carboxyl groups of the surface capping ligands, neutralize the negative charges on the surface of MPA-QDs and decrease the electrostatic repulsion forces to induce MPA-QDs aggregation. In addition, MPA-QDs could be bound with and wrapped into the flocs of hydrolysis products of coagulants. The results reported here could help broaden our understanding of the impacts and remediation of water-dispersed core-shell QD nanoparticles.
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Affiliation(s)
- Xu Chen
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China
| | - Yong Sik Ok
- Korea Biochar Research Center, Kangwon National University, Chuncheon, 24341, South Korea; O-Jeong Eco-Resilience Institute (OJERI) & Division of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Dinesh Mohan
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Charles U Pittman
- Department of Chemistry, Mississippi State University, Mississippi, Mississippi State, 39762, United States
| | - Xiaomin Dou
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China.
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21
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Zhang W, Yang L, Kuang H, Yang P, Aguilar ZP, Wang A, Fu F, Xu H. Acute toxicity of quantum dots on late pregnancy mice: Effects of nanoscale size and surface coating. J Hazard Mater 2016; 318:61-69. [PMID: 27399148 DOI: 10.1016/j.jhazmat.2016.06.048] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 06/23/2016] [Accepted: 06/24/2016] [Indexed: 06/06/2023]
Abstract
In this study, the effects of cadmium containing QDs (such as CdSe/ZnS and CdSe QDs) and bulk CdCl2 in pregnant mice, their fetuses, and the pregnancy outcomes were investigated. It was shown that although the QDs and bulk CdCl2 were effectively blocked by the placental barrier, the damage on the placenta caused by CdSe QDs still led to fetus malformation, while the mice in CdSe/ZnS QDs treatment group exhibited slightly hampered growth but showed no significant abnormalities. Moreover, the Cd contents in the placenta and the uterus of CdSe QDs and CdSe/ZnS QDs treatment groups showed significantly higher than the CdCl2 treated group which indicated that the nanoscale size of the QDs allowed relative ease of entry into the gestation tissues. In addition, the CdSe QDs more effectively altered the expression levels of susceptive genes related to cell apoptosis, dysplasia, metal transport, cryptorrhea, and oxidative stress, etc. These findings suggested that the nanoscale size of the QDs were probably more important than the free Cd in inducing toxicity. Furthermore, the results indicated that the outer surface shell coating played a protective role in the adverse effects of QDs on late pregnancy mice.
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Affiliation(s)
- Wanyi Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China; The Second Affiliated Hospital of Nanchang University, Nanchang 330000, PR China
| | - Lin Yang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China
| | - Huijuan Kuang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China
| | - Pengfei Yang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China
| | | | - Andrew Wang
- Ocean NanoTech, LLC, Springdale, AR72764, USA
| | - Fen Fu
- The Second Affiliated Hospital of Nanchang University, Nanchang 330000, PR China.
| | - Hengyi Xu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China.
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22
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Part F, Zaba C, Bixner O, Zafiu C, Hann S, Sinner EK, Huber-Humer M. Traceability of fluorescent engineered nanomaterials and their fate in complex liquid waste matrices. Environ Pollut 2016; 214:795-805. [PMID: 27155097 DOI: 10.1016/j.envpol.2016.04.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 04/06/2016] [Accepted: 04/08/2016] [Indexed: 06/05/2023]
Abstract
The number of products containing engineered nanomaterials (ENMs) has increased due to their high industrial relevance as well as their use in diverse consumer products. At the end of their life cycle ENMs might be released to the environment and therefore concerns arise regarding their environmental impact. In order to track their fate upon disposal, it is crucial to establish methods to trace ENMs in complex environmental samples and to differentiate them from naturally-occurring nanoparticles. The goal of this study was to distinctively trace ENMs by (non-invasive) detection methods. For this, fluorescent ENMs, namely quantum dots (QDs), were distinctively traced in complex aqueous matrices, and were still detectable after a period of two months using fluorescence spectroscopy. In particular, two water-dispersible QD-species, namely CdTe/CdS QDs with N-acetyl-l-cysteine as capping agent (NAC-QDs) and surfactant-stabilized CdSe/ZnS QDs (Brij(®)58-QDs), were synthesized to examine their environmental fate during disposal as well as their potential interaction with naturally-occurring substances present in landfill leachates. When QDs were spiked into a leachate from an old landfill site, alteration processes, such as sorption, aggregation, agglomeration, and interactions with dissolved organic carbon (DOC), led to modifications of the optical properties of QDs. The spectral signatures of NAC-QDs deteriorated depending on residence time and storage temperature, while Brij(®)58-QDs retained their photoluminescence fingerprints, indicating their high colloidal stability. The observed change in photoluminescence intensity was mainly caused by DOC-interaction and association with complexing agents, such as fulvic or humic acids, typically present in mature landfill leachates. For both QD-species, the results also indicated that pH of the leachate had no significant impact on their optical properties. As a result, the unique spectroscopic fingerprints of QDs, specifically surfactant-stabilized QDs, allowed distinctive tracing in complex aqueous waste matrices in order to study their long-term behavior and ultimate fate.
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Affiliation(s)
- Florian Part
- Department of Water-Atmosphere-Environment, Institute of Waste Management, University of Natural Resources and Life Sciences, Muthgasse 107, 1190 Vienna, Austria; Department of Nanobiotechnology, Institute for Synthetic Bioarchitectures, University of Natural Resources and Life Sciences, Muthgasse 11, 1190 Vienna, Austria
| | - Christoph Zaba
- Department of Nanobiotechnology, Institute for Synthetic Bioarchitectures, University of Natural Resources and Life Sciences, Muthgasse 11, 1190 Vienna, Austria
| | - Oliver Bixner
- Department of Nanobiotechnology, Institute for Synthetic Bioarchitectures, University of Natural Resources and Life Sciences, Muthgasse 11, 1190 Vienna, Austria
| | - Christian Zafiu
- ICS-6 Structure Biochemistry, Forschungszentrum Jülich, Wilhelm-Johnen-Straße, 52425 Jülich, Germany
| | - Stephan Hann
- Department of Chemistry, Division of Analytical Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria
| | - Eva-Kathrin Sinner
- Department of Nanobiotechnology, Institute for Synthetic Bioarchitectures, University of Natural Resources and Life Sciences, Muthgasse 11, 1190 Vienna, Austria.
| | - Marion Huber-Humer
- Department of Water-Atmosphere-Environment, Institute of Waste Management, University of Natural Resources and Life Sciences, Muthgasse 107, 1190 Vienna, Austria
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Martynenko IV, Kuznetsova VA, Litvinov IK, Orlova AO, Maslov VG, Fedorov AV, Dubavik A, Purcell-Milton F, Gun'ko YK, Baranov AV. Enantioselective cellular uptake of chiral semiconductor nanocrystals. Nanotechnology 2016; 27:075102. [PMID: 26782947 DOI: 10.1088/0957-4484/27/7/075102] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The influence of the chirality of semiconductor nanocrystals, CdSe/ZnS quantum dots (QDs) capped with L- and D-cysteine, on the efficiency of their uptake by living Ehrlich Ascite carcinoma cells is studied by spectral- and time-resolved fluorescence microspectroscopy. We report an evident enantioselective process where cellular uptake of the L-Cys QDs is almost twice as effective as that of the D-Cys QDs. This finding paves the way for the creation of novel approaches to control the biological properties and behavior of nanomaterials in living cells.
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Affiliation(s)
- I V Martynenko
- ITMO University, 49 Kronverksky pr., St. Petersburg, 197101, Russia
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24
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Abstract
Toxicity of quantum dots (QDs) has been a hot research concern in the past decade, and there is a lot of challenge in this field. The physicochemical characteristics of QDs can affect their toxicity, while little is known about the specific chemical form of QDs in living cells after incubation so far. In this work, speciation of four CdSe/ZnS QDs in HepG2 cells was carried out from the metallomics' point of view for the first time by using size exclusion chromatography (SEC) coupled with inductively coupled plasma-mass spectrometry (ICP-MS). On the basis of the signal of Cd, two kinds of chemical forms, named as QD-1 and QD-2, were observed in HepG2 cells incubated with CdSe/ZnS QDs. QD-1 was demonstrated to be a kind of QD-like nanoparticles, confirmed by chromatographic retention time, transmission electron microscopy (TEM) characterization, and fluorescence detection. QD-2 was demonstrated to be cadmium-metallothioneins complex (Cd-MTs) by reversed phase liquid chromatography (RPLC) synchronously coupled with ICP-MS and electrospray ionization quadrupole time-of-flight mass spectrometry (ESI-Q-TOF-MS) analysis. Meanwhile, speciation of QDs in HepG2 cells incubated with different conditions was analyzed. With the variation of QDs incubation concentration/time, and elimination time, the species of QD-1 and QD-2 were also observed without other obvious species, and both the amount of QD-1 and QD-2 increased with incubation concentration and time. The obtained results provide valuable information and a strategy for the study of existing chemical form of QDs, greatly benefiting the understanding of QDs toxicity in living cells.
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Affiliation(s)
- Lu Peng
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University , Wuhan 430072, PR China
| | - Man He
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University , Wuhan 430072, PR China
| | - Beibei Chen
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University , Wuhan 430072, PR China
| | - Yu Qiao
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University , Wuhan 430072, PR China
| | - Bin Hu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University , Wuhan 430072, PR China
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Ma W, Liu HT, Long YT. Monitoring Dopamine Quinone-Induced Dopaminergic Neurotoxicity Using Dopamine Functionalized Quantum Dots. ACS Appl Mater Interfaces 2015; 7:14352-14358. [PMID: 26070031 DOI: 10.1021/acsami.5b03044] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Dopamine (DA) quinone-induced dopaminergic neurotoxicity is known to occur due to the interaction between DA quinone and cysteine (Cys) residue, and it may play an important a role in pathological processes associated with neurodegeneration. In this study, we monitored the interaction process of DA to form DA quinone and the subsequent Cys residue using dopamine functionalized quantum dots (QDs). The fluorescence (FL) of the QD bioconjugates changes as a function of the structure transformation during the interaction process, providing a potential FL tool for monitoring dopaminergic neurotoxicity.
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26
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Shu C, Ding L, Zhong W. Fluorescence resonance energy transfer between ZnSe ZnS quantum dots and bovine serum albumin in bioaffinity assays of anticancer drugs. Spectrochim Acta A Mol Biomol Spectrosc 2014; 131:195-202. [PMID: 24835726 DOI: 10.1016/j.saa.2014.04.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 03/23/2014] [Accepted: 04/06/2014] [Indexed: 06/03/2023]
Abstract
In the current work, using ZnSe ZnS quantum dots (QDs) as representative nanoparticles, the affinities of seven anticancer drugs for bovine serum albumin (BSA) were studied using fluorescence resonance energy transfer (FRET). The FRET efficiency of BSA-QD conjugates can reach as high as 24.87% by electrostatic interaction. The higher binding constant (3.63×10(7)Lmol(-1)) and number of binding sites (1.75) between ZnSe ZnS QDs and BSA demonstrated that the QDs could easily associate to plasma proteins and enhance the transport efficacy of drugs. The magnitude of binding constants (10(3)-10(6)Lmol(-1)), in the presence of QDs, was between drugs-BSA and drugs-QDs in agreement with common affinities of drugs for serum albumins (10(4)-10(6)Lmol(-1)) in vivo. ZnSe ZnS QDs significantly increased the affinities for BSA of Vorinostat (SAHA), Docetaxel (DOC), Carmustine (BCNU), Doxorubicin (Dox) and 10-Hydroxycamptothecin (HCPT). However, they slightly reduced the affinities of Vincristine (VCR) and Methotrexate (MTX) for BSA. The recent work will not only provide useful information for appropriately understanding the binding affinity and binding mechanism at the molecular level, but also illustrate the ZnSe ZnS QDs are perfect candidates for nanoscal drug delivery system (DDS).
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Affiliation(s)
- Chang Shu
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing 210009, PR China
| | - Li Ding
- Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing 210009, PR China.
| | - Wenying Zhong
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing 210009, PR China.
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27
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Liu FF, Yu Y, Lin BX, Hu XG, Cao YJ, Wu JZ. Visualization of hormone binding proteins in vivo based on Mn-doped CdTe QDs. Spectrochim Acta A Mol Biomol Spectrosc 2014; 131:9-16. [PMID: 24815196 DOI: 10.1016/j.saa.2014.04.066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 04/09/2014] [Accepted: 04/13/2014] [Indexed: 06/03/2023]
Abstract
Daminozide (B9) is a growth inhibitor with important regulatory roles in plant growth and development. Locating and quantifying B9-binding proteins in plant tissues will assist in investigating the mechanism behind the signal transduction of B9. In this study, red fluorescent Mn-doped CdTe quantum dots (CdTeMn QDs) were synthesized by a high-temperature hydrothermal process. Since CdTeMn QDs possess a maximum fluorescence emission peak at 610nm, their fluorescence properties are more stable than those of CdTe QDs. A B9-CdTeMn probe was synthesized by coupling B9 with CdTeMn QDs. The fluorescence intensity of the probe is double that of CdTeMn QDs; its fluorescence stability is also superior under different ambient conditions. The probe retains the biological activity of B9 and is unaffected by interference from the green fluorescent protein present in plants. Therefore, we used this probe to label B9-binding proteins selectively in root tissue sections of mung bean seedlings. These proteins were observed predominantly on the surfaces of the cell membranes of the cortex and epidermal parenchyma.
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Affiliation(s)
- Fang fei Liu
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China
| | - Ying Yu
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China.
| | - Bi xia Lin
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China
| | - Xiao gang Hu
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China
| | - Yu juan Cao
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China
| | - Jian zhong Wu
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China
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28
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Chen X, Jin Q, Wu L, Tung C, Tang X. Synthesis and unique photoluminescence properties of nitrogen-rich quantum dots and their applications. Angew Chem Int Ed Engl 2014; 53:12542-7. [PMID: 25296956 DOI: 10.1002/anie.201408422] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Indexed: 01/23/2023]
Abstract
Nitrogen-rich quantum dots (N-dots) were serendipitously synthesized in methanol or aqueous solution at a reaction temperature as low as 50 °C. These N-dots have a small size (less than 10 nm) and contain a high percentage of the element nitrogen, and are thus a new member of quantum-dot family. These N-dots show unique and distinct photoluminescence properties with an increasing percentage of nitrogen compared to the neighboring carbon dots. The photoluminescence behavior was adjusted from blue to green simply through variation of the reaction temperature. Furthermore, the detailed mechanism of N-dot formation was also proposed with the trapped intermediate. These N-dots have also shown promising applications as fluorescent ink and biocompatible staining in C. elegans.
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Affiliation(s)
- Xiuxian Chen
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, No. 38, Xueyuan Rd. Beijing 100191 (China)
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29
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Abstract
BDNF plays an important role in several facets of neuronal survival, differentiation, and function. Structural and functional deficits in axons are increasingly viewed as an early feature of neurodegenerative diseases, including Alzheimer's disease (AD) and Huntington's disease (HD). As yet unclear is the mechanism(s) by which axonal injury is induced. We reported the development of a novel technique to produce biologically active, monobiotinylated BDNF (mBtBDNF) that can be used to trace axonal transport of BDNF. Quantum dot-labeled BDNF (QD-BDNF) was produced by conjugating quantum dot 655 to mBtBDNF. A microfluidic device was used to isolate axons from neuron cell bodies. Addition of QD-BDNF to the axonal compartment allowed live imaging of BDNF transport in axons. We demonstrated that QD-BDNF moved essentially exclusively retrogradely, with very few pauses, at a moving velocity of around 1.06 μm/sec. This system can be used to investigate mechanisms of disrupted axonal function in AD or HD, as well as other degenerative disorders.
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Affiliation(s)
- Xiaobei Zhao
- Department of Neurosciences, University of California, San Diego
| | - Yue Zhou
- School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University
| | | | - Matthew L Pearn
- Department of Anesthesiology, University of California, San Diego; VA San Diego Healthcare System
| | - William C Mobley
- Department of Neurosciences, University of California, San Diego
| | - Chengbiao Wu
- Department of Neurosciences, University of California, San Diego;
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30
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Mortimer M, Kahru A, Slaveykova VI. Uptake, localization and clearance of quantum dots in ciliated protozoa Tetrahymena thermophila. Environ Pollut 2014; 190:58-64. [PMID: 24727587 DOI: 10.1016/j.envpol.2014.03.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 03/13/2014] [Accepted: 03/19/2014] [Indexed: 06/03/2023]
Abstract
Protozoa as phagocytizing cells have been shown to integrate engineered nanoparticles (NPs), while the mechanism, dynamics and extent of such uptake are unclear. Here our fluorescence microscopy data showed that CdSe/ZnS quantum dots (QDs) with primary size of 12 nm were readily phagocytized into the food vacuoles of Tetrahymena thermophila in a time- and dose-dependent manner. Twenty hours after the exposure to QDs in sublethal concentration the clearance of the QDs from the cells was incomplete suggesting that phagocytosis of QDs into food vacuoles was not the only pathway of uptake by T. thermophila. This was further proven by the results that the inhibition of phagocytosis did not block the internalization of QDs into protozoans. This study provides a new insight into uptake and cellular trafficking of subtoxic concentrations of nanoparticles that may, due to prolonged retention times in the cells, pose risks by potentially becoming available to higher trophic levels.
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Affiliation(s)
- Monika Mortimer
- Environmental Biogeochemistry and Ecotoxicology, Institute F.-A. Forel, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, 10 route de Suisse, 1290 Versoix, Switzerland; Laboratory of Environmental Toxicology, National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia.
| | - Anne Kahru
- Laboratory of Environmental Toxicology, National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia
| | - Vera I Slaveykova
- Environmental Biogeochemistry and Ecotoxicology, Institute F.-A. Forel, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, 10 route de Suisse, 1290 Versoix, Switzerland.
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31
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Pu K, Shuhendler AJ, Jokerst JV, Mei J, Gambhir SS, Bao Z, Rao J. Semiconducting polymer nanoparticles as photoacoustic molecular imaging probes in living mice. Nat Nanotechnol 2014; 9:233-9. [PMID: 24463363 PMCID: PMC3947658 DOI: 10.1038/nnano.2013.302] [Citation(s) in RCA: 855] [Impact Index Per Article: 85.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 12/10/2013] [Indexed: 05/12/2023]
Abstract
Photoacoustic imaging holds great promise for the visualization of physiology and pathology at the molecular level with deep tissue penetration and fine spatial resolution. To fully utilize this potential, photoacoustic molecular imaging probes have to be developed. Here, we introduce near-infrared light absorbing semiconducting polymer nanoparticles as a new class of contrast agents for photoacoustic molecular imaging. These nanoparticles can produce a stronger signal than the commonly used single-walled carbon nanotubes and gold nanorods on a per mass basis, permitting whole-body lymph-node photoacoustic mapping in living mice at a low systemic injection mass. Furthermore, the semiconducting polymer nanoparticles possess high structural flexibility, narrow photoacoustic spectral profiles and strong resistance to photodegradation and oxidation, enabling the development of the first near-infrared ratiometric photoacoustic probe for in vivo real-time imaging of reactive oxygen species--vital chemical mediators of many diseases. These results demonstrate semiconducting polymer nanoparticles to be an ideal nanoplatform for developing photoacoustic molecular probes.
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Affiliation(s)
- Kanyi Pu
- Molecular Imaging Program at Stanford, Department of Radiology, School of Medicine, Stanford University, Stanford, California, USA
| | - Adam J. Shuhendler
- Molecular Imaging Program at Stanford, Department of Radiology, School of Medicine, Stanford University, Stanford, California, USA
| | - Jesse V. Jokerst
- Molecular Imaging Program at Stanford, Department of Radiology, School of Medicine, Stanford University, Stanford, California, USA
| | - Jianguo Mei
- Department of Chemical Engineering, Stanford University, Stanford, California, USA
| | - Sanjiv S. Gambhir
- Molecular Imaging Program at Stanford, Department of Radiology, School of Medicine, Stanford University, Stanford, California, USA
- Department of Bioengineering and Department of Materials Science & Engineering, Stanford University, Stanford, California, USA
| | - Zhenan Bao
- Department of Chemical Engineering, Stanford University, Stanford, California, USA
| | - Jianghong Rao
- Molecular Imaging Program at Stanford, Department of Radiology, School of Medicine, Stanford University, Stanford, California, USA
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32
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Palacios MA, Lacy MM, Schubert SM, Manesse M, Walt DR. Assessing the stochastic intermittency of single quantum dot luminescence for robust quantification of biomolecules. Anal Chem 2013; 85:6639-45. [PMID: 23631644 PMCID: PMC3739287 DOI: 10.1021/ac4001332] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Single molecule detection schemes promise that one has the ability to reach the ultimate limit of detection: one molecule. In this paper, we use the stochastic luminescence of single semiconductor nanocrystals (quantum dots, QDs) to detect and localize particles as digital counts. These digital counts can be correlated to the concentration of analytes in solution. Here, we use total internal reflection fluorescence (TIRF) microscopy to probe individual QDs immobilized on a functionalized substrate. QDs have found their niche in the bioanalytical community due to their remarkable brightness and stability. Despite their numerous outstanding photophysical properties, QDs at the single particle level display a pronounced intermittent luminescence, posing a challenge for the detection of individual particles. In this paper, we demonstrate a reliable method for detecting QDs that takes advantage of these signal fluctuations by comparing the variations in the QD's fluorescence signals against variations of the background signal. The quantitative methodology developed here results in signal-to-background ratios up to 90:1, which is at least 8-times higher than the ratios obtained using methodologies relying solely on signal integration. This enhanced signal-to-background ratio facilitates a robust thresholding process and results in femtomolar limits of detection.
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Affiliation(s)
- Manuel A Palacios
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155, United States
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