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Recent Advances in Self-Assembled DNA Nanosensors
Karina M. M. Carneiro,
Andrea A. Greschner
Issue:
Volume 3, Issue 1-1, January 2015
Pages:
1-7
Received:
30 November 2014
Accepted:
18 December 2014
Published:
27 December 2014
DOI:
10.11648/j.nano.s.2015030101.11
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Abstract: Over the past 30 years DNA has been assembled into a plethora of structures by design, based on its reliable base pairing properties. As a result, many applications of DNA nanotechnology are emerging. Here, we review recent advances in the use of self-assembled DNA nanostructures as sensors. In particular, we focus on how defined nanostructures, such as rigid DNA tetrahedra, provide an advantage over traditional nanosensors consisting of arrays of single-stranded DNA. We also explore advances in DNA origami that have resulted in consistent detection of single molecules.
Abstract: Over the past 30 years DNA has been assembled into a plethora of structures by design, based on its reliable base pairing properties. As a result, many applications of DNA nanotechnology are emerging. Here, we review recent advances in the use of self-assembled DNA nanostructures as sensors. In particular, we focus on how defined nanostructures, su...
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Synthesis of a Novel L-Tartaric Acid Derived Homochiral Nanoscale Framework and Its Application in L-Proline Detection and Acetalization Catalysis
Xiong Peng,
Radoelizo S. A.,
Liping Liu,
Yi Luan
Issue:
Volume 3, Issue 1-1, January 2015
Pages:
8-12
Received:
29 November 2014
Accepted:
19 December 2014
Published:
3 January 2015
DOI:
10.11648/j.nano.s.2015030101.12
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Abstract: A novel homochiral nanoscale compound, [Ca(L-C4H4O6)(H2O)2]•2H2O (Ca(L-tart)(H2O)2), which is derived from calcium ions and L-tartaric acid (L-tart =C4H4O6), was synthesized under hydrothermal condition. It has been characterized by single crystal X-ray diffraction, SEM, XRD, FTIR and TG. The calcium atoms adopt a tetrahedron geometry and each atom coordinates with eight oxygen atoms. The compound forms a two-dimensional network structure in the solid state via hydrogen bonds. Its performance of L-proline detection was tested, which attained effective result for the porous framework. Meanwhile, the high activity was also shown in acetalization catalysis.
Abstract: A novel homochiral nanoscale compound, [Ca(L-C4H4O6)(H2O)2]•2H2O (Ca(L-tart)(H2O)2), which is derived from calcium ions and L-tartaric acid (L-tart =C4H4O6), was synthesized under hydrothermal condition. It has been characterized by single crystal X-ray diffraction, SEM, XRD, FTIR and TG. The calcium atoms adopt a tetrahedron geometry and each atom...
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Liposome-Based Nanosensors for Biological Detection
Changfeng Chen,
Qiong Wang
Issue:
Volume 3, Issue 1-1, January 2015
Pages:
13-17
Received:
7 December 2014
Accepted:
31 December 2014
Published:
23 January 2015
DOI:
10.11648/j.nano.s.2015030101.13
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Abstract: Liposomes are self-assembled structures that contain an inner aqueous compartment surrounded by a lipid bilayer. This unique structure inherently provides liposomes with a powerful capability for encapsulating hydrophilic, hydrophobic or amphiphilic molecules or nanoparticles. Combining this property with appropriate signal amplification strategies and transduction techniques results in a variety of in vitro or in vivo biological sensors. In this review article, we discuss the latest trends in engineering and applications of liposome based nanosensors for biological sensing. Particular focus was made on the coupling of liposomes with popular sensor materials (enzymes, quantum dots, metal nanoparticles and other sensor enhancement elements) for highly sensitive and selective detection of chemical and biological species. Such information will be viable in terms of providing a useful platform for designing future ultrasensitive liposome nanosensors.
Abstract: Liposomes are self-assembled structures that contain an inner aqueous compartment surrounded by a lipid bilayer. This unique structure inherently provides liposomes with a powerful capability for encapsulating hydrophilic, hydrophobic or amphiphilic molecules or nanoparticles. Combining this property with appropriate signal amplification strategies...
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Review: Biosensor for Detection of Pesticide Residue
Qichen Wang,
Youyou Xiong,
Liping Lou
Issue:
Volume 3, Issue 1-1, January 2015
Pages:
18-22
Received:
7 December 2014
Accepted:
10 January 2015
Published:
27 January 2015
DOI:
10.11648/j.nano.s.2015030101.14
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Abstract: Pesticide residue is a common contamination in the environment and food. Various analytical methods have been developed to detect and analyze the residues. Biosensor is one of the fast detection technologies. In this paper, we reviewed those biosensors according to their unique detection mechanism, fabrication and incorporation with nanomaterials.
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Review: Recent Developments of Carbon Nanotubes Hybrid Assemblies for Sensing
Junxin Luo,
Yong Wu,
Shen Lin
Issue:
Volume 3, Issue 1-1, January 2015
Pages:
23-28
Received:
30 November 2014
Accepted:
16 January 2015
Published:
27 January 2015
DOI:
10.11648/j.nano.s.2015030101.15
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Abstract: In this review, we discuss state-of-the-art sensing methods for the detection of chemical and biological molecules, using a well-known and much studied material, carbon nanotubes, as the hybrid materials for fabrication assemblies. CNTs possesses a wide range of unique characteristics, including intriguing physical properties, higher aspect ratios, larger surface area, better chemical and thermal stability, and electronic and optical properties. The objective of this review is to present an overview of the synthetic strategies and their applications in both amperometric sensors and SPME fiber coatings. These methods are fast, sensitive, cheap and suitable for in-situ monitoring. We comprehensively review the mechanisms, the principles and the performances of chemical sensors and biosensors available in the literature.
Abstract: In this review, we discuss state-of-the-art sensing methods for the detection of chemical and biological molecules, using a well-known and much studied material, carbon nanotubes, as the hybrid materials for fabrication assemblies. CNTs possesses a wide range of unique characteristics, including intriguing physical properties, higher aspect ratios,...
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SERS Spectra of Permethrin on Silver Nanofilm
Jumin Hao,
Qingwu K. Wang,
Wayne Weimer,
Justin Abell,
Monika Wilson
Issue:
Volume 3, Issue 1-1, January 2015
Pages:
29-32
Received:
5 March 2015
Accepted:
6 March 2015
Published:
28 April 2015
DOI:
10.11648/j.nano.s.2015030101.16
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Abstract: Surface enhanced Raman scattering (SERS) has emerged as an ultrasensitive analytical tool for chemical, biological, and medical analysis. SERS spectra of permethrin, a common synthetic pyrethroid, were investigated for the first time. The SERS substrates used in this work were a silver nanofilm (AgNF) deposited on glass chips. The characteristic SERS bands of permethrin were analyzed and assigned to the corresponding modes. The strongest SERS band appeared at 1003 cm-1 due to the breath vibration of benzene ring in the permethrin molecule. A detection limit of 10 ppm was obtained on the AgNF sub-strates. A good linear relationship between peak height of the 1003 cm-1 band and permethrin concentration was observed in the range of 10 – 1000 ppm. The results obtained in this work indicate that SERS technique has a great potential for rapid, simple, in situ, and cost-effective detection and monitoring of permethrin in environment and on foods.
Abstract: Surface enhanced Raman scattering (SERS) has emerged as an ultrasensitive analytical tool for chemical, biological, and medical analysis. SERS spectra of permethrin, a common synthetic pyrethroid, were investigated for the first time. The SERS substrates used in this work were a silver nanofilm (AgNF) deposited on glass chips. The characteristic SE...
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