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2017 ; 7
(1
): 10656
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SERS-based Immunoassay in a Microfluidic System for the Multiplexed Recognition
of Interleukins from Blood Plasma: Towards Picogram Detection
#MMPMID28878312
Kami?ska A
; Winkler K
; Kowalska A
; Witkowska E
; Szymborski T
; Janeczek A
; Waluk J
Sci Rep
2017[Sep]; 7
(1
): 10656
PMID28878312
show ga
SERS-active nanostructures incorporated into a microfluidic device have been
developed for rapid and multiplex monitoring of selected Type 1 cytokine
(interleukins: IL-6, IL-8, IL-18) levels in blood plasma. Multiple analyses have
been performed by using nanoparticles, each coated with different Raman reporter
molecules: 5,5'-dithio-bis(2-nitro-benzoic acid) (DTNB), fuchsin (FC), and
p-mercatpobenzoic acid (p-MBA) and with specific antibodies. The multivariate
statistical method, principal component analysis (PCA), was applied for
segregation of three different antigen-antibody complexes encoded by three Raman
reporters (FC, p-MBA, and DTNB) during simultaneous multiplexed detection
approach. To the best of our knowledge, we have also presented, for the first
time, a possibility for multiplexed quantification of three interleukins: IL-6,
IL-8, and IL-18 in blood plasma samples using SERS technique. Our method improves
the detection limit in comparison to standard ELISA methods. The low detection
limits were estimated to be 2.3?pg·ml(-1), 6.5?pg·ml(-1), and 4.2?pg·ml(-1) in a
parallel approach, and 3.8?pg·ml(-1), 7.5?pg·ml(-1), and 5.2?pg·ml(-1) in a
simultaneous multiplexed method for IL-6, IL-8, and IL-18, respectively. This
demonstrated the sensitivity and reproducibility desirable for analytical
examinations.