Limits...
Miniaturized integrated platform for electrical and optical monitoring of cell cultures.

Moldovan C, Iosub R, Codreanu C, Firtat B, Necula D, Brasoveanu C, Stan I - Sensors (Basel) (2012)

Bottom Line: Ten platinum electrodes and five sensors are placed on the shank and are connected with the external electronics through the pads.The electrodes are bidirectional and can be used both for electrical potential recording and stimulation of cells.The fabrication steps are presented, along with the electrical and optical characterization of the system.

View Article: PubMed Central - PubMed

Affiliation: National Institute for Research and Development in Microtechnologies, 126 Erou Iancu Nicolae, Bucharest 077190, Romania. carmen.moldovan@imt.ro

ABSTRACT
The following paper describes the design and functions of a miniaturized integrated platform for optical and electrical monitoring of cell cultures and the necessary steps in the fabrication and testing of a silicon microchip Micro ElectroMechanical Systems (MEMS)-based technology for cell data recording, monitoring and stimulation. The silicon microchip consists of a MEMS machined device containing a shank of 240 μm width, 3 mm long and 50 μm thick and an enlarged area of 5 mm × 5 mm hosting the pads for electrical connections. Ten platinum electrodes and five sensors are placed on the shank and are connected with the external electronics through the pads. The sensors aim to monitor the pH, the temperature and the impedance of the cell culture. The electrodes are bidirectional and can be used both for electrical potential recording and stimulation of cells. The fabrication steps are presented, along with the electrical and optical characterization of the system. The target of the research is to develop a new and reconfigurable platform according to the particular applications needs, as a tool for the biologist, chemists and medical doctors working is the field of cell culture monitoring in terms of growth, maintenance conditions, reaction to electrical or chemical stimulation (drugs, toxicants, etc.). HaCaT (Immortalised Human Keratinocyte) cell culture has been used for demonstration purposes in order to provide information on the platform electrical and optical functions.

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The redox states of polyaniline.
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f16-sensors-12-11372: The redox states of polyaniline.

Mentions: The structure of the undoped polyaniline may vary between two limit structures [11]: the completely oxidized state, called pernigraniline, violet and insulating (A) and the completely reduced state, called leucoemeraldine, yellow and insulating (C). The redox states of polyaniline are shown in Scheme 1. The emeraldine salt form (Scheme 1, E) is the conductive polyaniline form and it is a protonated state. The emeraldine salt is highly conductive, green color and can be directly obtained by oxidative polymerization of aniline in a HCl environment. If stronger oxidation agents are used the E state is turned into protonated pernigraniline (salt), which is supposed to be conductive too. Continuing the basic treatment (NH4OH) leads to pernigraniline base (A), so the reversible interconversion of structures A, B, C, D, E requires an acid/base couple or an oxidant/reducer couple or both. The oxido/reduction reaction may be performed electrochemically.


Miniaturized integrated platform for electrical and optical monitoring of cell cultures.

Moldovan C, Iosub R, Codreanu C, Firtat B, Necula D, Brasoveanu C, Stan I - Sensors (Basel) (2012)

The redox states of polyaniline.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472889&req=5

f16-sensors-12-11372: The redox states of polyaniline.
Mentions: The structure of the undoped polyaniline may vary between two limit structures [11]: the completely oxidized state, called pernigraniline, violet and insulating (A) and the completely reduced state, called leucoemeraldine, yellow and insulating (C). The redox states of polyaniline are shown in Scheme 1. The emeraldine salt form (Scheme 1, E) is the conductive polyaniline form and it is a protonated state. The emeraldine salt is highly conductive, green color and can be directly obtained by oxidative polymerization of aniline in a HCl environment. If stronger oxidation agents are used the E state is turned into protonated pernigraniline (salt), which is supposed to be conductive too. Continuing the basic treatment (NH4OH) leads to pernigraniline base (A), so the reversible interconversion of structures A, B, C, D, E requires an acid/base couple or an oxidant/reducer couple or both. The oxido/reduction reaction may be performed electrochemically.

Bottom Line: Ten platinum electrodes and five sensors are placed on the shank and are connected with the external electronics through the pads.The electrodes are bidirectional and can be used both for electrical potential recording and stimulation of cells.The fabrication steps are presented, along with the electrical and optical characterization of the system.

View Article: PubMed Central - PubMed

Affiliation: National Institute for Research and Development in Microtechnologies, 126 Erou Iancu Nicolae, Bucharest 077190, Romania. carmen.moldovan@imt.ro

ABSTRACT
The following paper describes the design and functions of a miniaturized integrated platform for optical and electrical monitoring of cell cultures and the necessary steps in the fabrication and testing of a silicon microchip Micro ElectroMechanical Systems (MEMS)-based technology for cell data recording, monitoring and stimulation. The silicon microchip consists of a MEMS machined device containing a shank of 240 μm width, 3 mm long and 50 μm thick and an enlarged area of 5 mm × 5 mm hosting the pads for electrical connections. Ten platinum electrodes and five sensors are placed on the shank and are connected with the external electronics through the pads. The sensors aim to monitor the pH, the temperature and the impedance of the cell culture. The electrodes are bidirectional and can be used both for electrical potential recording and stimulation of cells. The fabrication steps are presented, along with the electrical and optical characterization of the system. The target of the research is to develop a new and reconfigurable platform according to the particular applications needs, as a tool for the biologist, chemists and medical doctors working is the field of cell culture monitoring in terms of growth, maintenance conditions, reaction to electrical or chemical stimulation (drugs, toxicants, etc.). HaCaT (Immortalised Human Keratinocyte) cell culture has been used for demonstration purposes in order to provide information on the platform electrical and optical functions.

Show MeSH
Related in: MedlinePlus