Bio-photosensor: Cyanobacterial photosystem I coupled with transistor via molecular wire

Terasaki, Nao; Yamamoto, Naokatsu; Tamada, Kaoru; Hattori, Mineyuki; Hiraga, Takashi; Tohri, Akihiko; Sato, Ikutaro; Iwai, Masaru; Iwai, Michinao; Taguchi, Shunpei; Enami, Isao; Inoue, Yasunori; Yamanoi, Yoshinori; Yonezawa, Tetsu; Mizuno, K.; Murata, Masaki; Nishihara, Hiroshi; Yoneyama, Satoshi; Minakata, Makoto; Ohmori, T.; Sakai, Makoto; Fujii, Masaaki

doi:10.1016/j.bbabio.2006.11.008

Cited by 115 publications

(104 citation statements)

References 28 publications

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“…[1][2][3] Photochemical charge separation occurs in these systems with a quantum yield (event per photon absorbed) close to unity, and there is growing interest in how reaction center proteins can be directly exploited for device applications in photovoltaics, biosensing, photodetection, fuel synthesis and biocomputing. [4][5][6][7][8][9][10][11][12][13][14][15] Key to the development of these new hybrid technologies is the effective interfacing of proteinaceous reaction centers with manmade materials.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Carbon Nanotube Electrode Produces a Near‐Symmetrical Alternating Current from Photosynthetic Protein‐Based Photoelectrochemical Cells

Tan

Yan

Crouch

et al. 2013

Adv Funct Materials

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The construction of protein‐based photoelectrochemical cells that produce a variety of alternating currents in response to discontinuous illumination is reported. The photovoltaic component is a protein complex from the purple photosynthetic bacterium Rhodobacter sphaeroides which catalyses photochemical charge separation with a high quantum yield. Photoelectrochemical cells formed from this protein, a mobile redox mediator and a counter electrode formed from cobalt disilicide, titanium nitride, platinum, or multi‐walled carbon nanotubes (MWCNT) generate a direct current during continuous illumination and an alternating current with different characteristics during discontinuous illumination. In particular, the use of superhydrophobic MWCNT as the back electrode results in a near symmetrical forward and reverse current upon light on and light off, respectively. The symmetry of the AC output of these cells is correlated with the wettability of the counter electrode. Potential applications of a hybrid biological/synthetic solar cell capable of generating an approximately symmetrical alternating current are discussed.

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Section: Introductionmentioning

confidence: 99%

Superhydrophobic Carbon Nanotube Electrode Produces a Near‐Symmetrical Alternating Current from Photosynthetic Protein‐Based Photoelectrochemical Cells

Tan

Yan

Crouch

et al. 2013

Adv Funct Materials

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“…This result indicates that the naphthoquinone unit was inserted in the pocket of VK 1 , and efficient multi-step electron transfer was recovered. These treatments was confirmed not only by the [144] spectrum method, but also by TEM images directly, in other word they succeeded in the visualization of the reconstitution of the designed molecular wire with gold nanoparticle to the PSI( VK 1 ). From the TEM images in Fig.…”

Section: Enhancement Of Effectsmentioning

confidence: 57%

“…In other word, the key process of the SPED is how to prepare the ultrahigh photo-electron conversion system. Terasaki, Yonezawa and their co-workers suggested employing a bio-component as a part of artificial device [144,145], because bio-components have achieved ultrahigh performance compared to the artificial ones. Bio-components from living bodies are very attractive nano-materials, because they have already achieved ultra-high and ultimate performance as the result of many cycles of mutation and natural selection.…”

Section: Enhancement Of Effectsmentioning

confidence: 99%

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Assembly and Immobilization of Metal Nanoparticles

Terasaki

Yonezawa

2011

Progress in Nanophotonics 1

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This paper reviews recent progress of chemical preparation of metal nanoparticles and their assembly formation processes. Various metal and semiconductor nanoparticles have been intensively studied according to their unique properties controlled by their sizes. One predicted that nanoparticles with the diameter in the range of 1-10 nm would display specific electronic structures, which reflect the electronic band structure ("quantum size effect"). For example, some metal nanoparticles in these sizes show photoemission. The melting points of these nanosized metal particles are extremely lower than the bulk. Gold, silver, and copper nanoparticles show their specific absorption, plasmon absorption, which is also used for surface plasmon resonance (SPR). To use their unique properties as materials, not only the control of their structures and sizes but also controlled formation of low dimensional assembly of these nanoparticles are highly important. Ordered assembly of such nanoparticles give their unique and interesting functions, such as sensing, electron tunneling, information stage and so forth. From this viewpoint, we would like to discuss hereafter a couple of fundamental preparation processes of metal nanoparticles and various assemble techniques.

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“…According to the published literature, we hypothesized that the naphthoquinone-derived AuNP conjugate concept is based on a combination of the favorable properties of the AuNP and the naphthoquinone molecules when forming a naphthoquinone-gold nanoparticle assembly. [24][25][26] A predicted schematic diagram of the Au-PAM-PB complex is shown in Figure 2D. According to our earlier work, the absorption peak at 512 nm indicates the spherical nature of the nanoparticles.…”

Section: Spectrofluorometric Analysis Of Reactive Oxygen Speciesmentioning

confidence: 99%

Cytotoxicity of naphthoquinones and their capacity to generate reactive oxygen species is quenched when conjugated with gold nanoparticles

Srinivas¹,

Patra²,

Bhattacharya

et al. 2011

IJN

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Several reports have demonstrated the anticancer activities of plumbagin, a naphthoquinone derivative isolated from plants belonging to Plumbaginaceae family. However, to the best of our knowledge, there are no reports which describe gold nanoconjugation with plumbagin, even though plumbagin is considered to be a promising therapeutic agent. In this report, we demonstrate the fabrication and characterization of gold nanoparticles conjugated with plumbagin (AuPB) that can reduce the toxicity of the latter, and their capacity for cellular localization and generation of reactive oxygen species. The anticancer activity and ability of plumbagin to produce reactive oxygen species was studied and compared with that of bromoderivatives of 1,4 naphthoquinones such as 2-bromo-1,4-naphthoquinone (2-BNQ) and 2,3-dibromo-1, 4-naphthoquinone (2,3-DBNQ) and their gold nanoconjugates. Plumbagin and bromoderivatives of 1,4 naphthoquinones in the form of gold nanoconjugates showed reduced cytotoxicity and apoptosis compared with the pristine compounds, ie, plumbagin, 2-BNQ, and 2,3-DBNQ. Interestingly, we observed that the gold nanoparticles could quench the reactive oxygen species-generating capacity of plumbagin, 2-BNQ, and 2,3-BNQ, which is one of the main mechanisms of action of the naphthoquinones. Therefore, it can be concluded that conjugation with gold nanoparticles can reduce the cytotoxicity of these compounds.

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Bio-photosensor: Cyanobacterial photosystem I coupled with transistor via molecular wire

Cited by 115 publications

References 28 publications

Superhydrophobic Carbon Nanotube Electrode Produces a Near‐Symmetrical Alternating Current from Photosynthetic Protein‐Based Photoelectrochemical Cells

Superhydrophobic Carbon Nanotube Electrode Produces a Near‐Symmetrical Alternating Current from Photosynthetic Protein‐Based Photoelectrochemical Cells

Assembly and Immobilization of Metal Nanoparticles

Cytotoxicity of naphthoquinones and their capacity to generate reactive oxygen species is quenched when conjugated with gold nanoparticles

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