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Bio-functionalized silver nanoparticles: a novel colorimetric probe for cysteine detection
- Source :
- Applied biochemistry and biotechnology. 175(7)
- Publication Year :
- 2014
-
Abstract
- Chemical interactions between nanoparticles and biomolecules are vital for applying nanoparticles in medicine and life science. Development of sensitive, rapid, low-cost, and eco-friendly sensors for the detection of molecules acting as disease indicator is need of an hour. In the present investigation, a green trend for silver nanoparticle synthesis was followed using leaf extract of Calotropis procera. Silver nanoparticles exhibited surface plasmon absorption peak at 421 nm, spherical shape with average size of 10 nm, and zeta potential of −22.4 mV. The as-synthesized silver nanoparticles were used for selective and sensitive detection of cysteine. Cysteine induces aggregation in stable silver nanoparticles owing to selective and strong interaction of –SH group of cysteine with silver nanoparticle surface. Cysteine-induced silver nanoparticle aggregation can be observed visually by change in color of silver nanoparticles from yellow to pink. Cysteine concentration was estimated colorimetrically by measuring absorption at surface plasmon wavelength. Limit of detection for cysteine using silver nanoparticles is ultralow, i.e., 100 nM. The mechanistic insight into cysteine detection by silver nanoparticles was investigated using FT-IR, TEM, DLS, and TLC analysis. Proposed method can be applied for the detection of cysteine in blood plasma and may give rise to a new insight into development of eco-friendly fabricated nanodiagnostic device in future.
- Subjects :
- Detection limit
chemistry.chemical_classification
Silver
Chemistry
Biomolecule
Surface plasmon
Inorganic chemistry
Nanoparticle
Metal Nanoparticles
Bioengineering
General Medicine
Biosensing Techniques
Applied Microbiology and Biotechnology
Biochemistry
Silver nanoparticle
Plant Leaves
Spectroscopy, Fourier Transform Infrared
Zeta potential
Colorimetry
Cysteine
Absorption (chemistry)
Molecular Biology
Biotechnology
Nuclear chemistry
Subjects
Details
- ISSN :
- 15590291
- Volume :
- 175
- Issue :
- 7
- Database :
- OpenAIRE
- Journal :
- Applied biochemistry and biotechnology
- Accession number :
- edsair.doi.dedup.....9f38abc49282e66634a9c379d6ce7d40