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2017 ; 7
(3
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Feasibility Study of an Optical Caustic Plasmonic Light Scattering Sensor for
Human Serum Anti-Dengue Protein E Antibody Detection
#MMPMID28817080
García AA
; Franco LS
; Pirez-Gomez MA
; Pech-Pacheco JL
; Mendez-Galvan JF
; Machain-Williams C
; Talavera-Aguilar L
; Espinosa-Carrillo JH
; Duarte-Villaseñor MM
; Be-Ortiz C
; Espinosa-de Los Monteros LE
; Castillo-Pacheco A
; Garcina-Rejon JE
Diagnostics (Basel)
2017[Aug]; 7
(3
): ä PMID28817080
show ga
Antibody detection and accurate diagnosis of tropical diseases is essential to
help prevent the spread of disease. However, most detection methods lack
cost-effectiveness and field portability, which are essential features for
achieving diagnosis in a timely manner. To address this, 3D-printed oblate
spheroid sample chambers were fabricated to measure green light scattering of
gold nanoparticles using an optical caustic focus to detect antibodies.
Scattering signals of 20-200 nm gold nanoparticles using a green laser were
compared to green light emitting diode (LED) light source signals and to Mie
theory. The change in signal from 60 to 120 nm decreased in the order of Mie
Theory > optical caustic scattering > 90° scattering. These results suggested
that conjugating 60 nm gold nanoparticles and using an optical caustic system to
detect plasmonic light scattering, would result in a sensitive test for detecting
human antibodies in serum. Therefore, we studied the light scattering response of
conjugated gold nanoparticles exposed to different concentrations of anti-protein
E antibody, and a feasibility study of 10 human serum samples using dot blot and
a handheld optical caustic-based sensor device. The overall agreement between
detection methods suggests that the new sensor concept shows promise to detect
gold nanoparticle aggregation in a homogeneous assay. Further testing and
protocol optimization is needed to draw conclusions on the positive and negative
predictive values for this new testing system.