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APPLICATION OF BIOSENSOR
P o i n t o f c a r e d i a g n o s t i c s .
B a c t e r i o lo g i c a l d e t e c t i o n
I n M e d i c a l C a r e
F o r d e t e r m i n a t i o n o f f o o d q u a l i t y
E n v i r o nm e n t a l m o n i t o r i n g .
F o r I n d u s t r i a l P r o c e s s C o n t r o l .
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Graphene oxide
Graphite when treated with strong oxidizers gives rise to the Graphite oxide,which is a compound of carbon, oxygen, and hydrogenin variable ratios.
Manufacture of Graphene Oxide
Graphene Oxideis formed by oxidizing crystalline graphite with a mixture of
sodium nitrate (NaNO3 , sulfuric acid (H2SO4),and potassium permanganate(KMnO4).The oxidation method is also known as the Hummers method.
Structurally, the Graphene Oxideis similar to a graphene sheet with its base
having oxygen-containing groups. Since these groups have an high affinity to
water molecules, Graphene Oxideis hydrophilic and can be easily dissolved in
water.
http://en.wikipedia.org/wiki/Carbonhttp://en.wikipedia.org/wiki/Oxygenhttp://en.wikipedia.org/wiki/Hydrogenhttp://www.azonano.com/ads/abmc.aspx?b=5265http://www.azonano.com/ads/abmc.aspx?b=5265http://www.azonano.com/ads/abmc.aspx?b=5265http://www.azonano.com/ads/abmc.aspx?b=5265http://www.azonano.com/ads/abmc.aspx?b=5265http://www.azonano.com/ads/abmc.aspx?b=5265http://en.wikipedia.org/wiki/Hydrogenhttp://en.wikipedia.org/wiki/Oxygenhttp://en.wikipedia.org/wiki/Carbon -
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Cont
Graphene Oxideis a poor conductor but when it undergoes treatment using
heat, light, or chemical reduction, most of graphene's properties are restored.
Chemical reduction is normally done using hydrazine.
It is possible to deposit Graphene Oxidefilms on any substrate, and then
convert it into a conductor. These coatings may be used in solar cells, flexible
electronics, chemical sensors, liquid crystal devices
Graphene, which is a conductor, graphene oxide is a semiconductors and can
replace silicon in electronics applications.
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Graphene
Graphene, is one of the allotropic forms of carbon.
It is a one-atom-thick planar sheet of carbon atoms that are densely packed in a honeycombcrystal lattice.
Graphite itself consists of many graphene sheets stacked together.
The carbon-carbon bond length in graphene is approximately 0.142 nm.
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Graphene production
Researchers obtained relatively large graphene sheets bymechanical exfoliation (repeated peeling) of 3D graphitecrystals.
Another method is to heat silicon carbide to high temperatures(1100C) to reduce it to graphene.
Graphene has excellent properties like:
Its entire volume is exposed to its surrounding.
High electrical conductivity.
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BIOSENSOR AND CANCER
Cancer is an abnormal and an uncontrolled cell growth
due to an accumulation of specific genetic andepigenetic defects.
Biosensor technology has the potential to provide: fast and accurate detection.
reliable imaging of cancer cells.
monitoring of angiogenesis and cancer metastasis.
ability to determine the effectiveness of anticancer
chemotherapy agents.
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Preexisting technology
Existing cancer screening methods include:
(1) the CA 15.3 test and mammography to detect breast
cancer in women.
(2) prostate-specific antigen (PSA) level detection in blood
sample for men to detect prostate cancer.
(3) blood detection for colon cancer.
(4) endoscopy, CT scans, X-ray, ultrasound imaging andMRI for various cancer detection.
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Cont
These traditional diagnostic methods however
are not very powerful methods :-
as they can not detect cancer at very early
stages.
some of the screening methods are quite costly
and not available for many people.
so use of biosensors to detect cancer biomarkers
in serum has spread widely.
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Biomarkers
In terms of cancer, the analyte being detected by
the biosensor is a tumor biomarker.
A biomarker is an indicator of a biological state of
disease.
Biomarkers can be DNA, RNA, or protein (i.e.,
hormone, antibody, oncogene, or tumor
suppressor).
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Functionalization of graphene
modified membrane
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CHARACTERIZATION OF IMMOILIZED GRAPHENE
Electron microscopy (TEM and SEM) and
atomic force microscopy have been used to
characterize the graphene.
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ST ND RDIZ TION OF PROTOCOL OF
N NOIMMUNOSENSOR
(A)Recording of amperometric data.
(B)Digitalization of signals and recording.
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CONCLUSION
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conclusion
In present work a graphene modified PCTE (polycarbonate Track
Etch)membrane is used in nanoimmunosensors which can be employed to
detect specific cell membrane-associated target antigens.
The morphology of graphene modified nanoporous membrane was
characterized by Scanning Electron Microscopy and chemical analysis was
completed by FTIR (Fourier Transform Infrared Spectroscopy) prior to use in
nanobiosensor.
This antibody immobilized membrane structure was then tested with a no.
of few antigens and cross checked by structurally related antigens for
specificity.
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