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2015 ; 5
(ä): 11339
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Rapid, automated, parallel quantitative immunoassays using highly integrated
microfluidics and AlphaLISA
#MMPMID26074253
Yu ZT
; Guan H
; Cheung MK
; McHugh WM
; Cornell TT
; Shanley TP
; Kurabayashi K
; Fu J
Sci Rep
2015[Jun]; 5
(ä): 11339
PMID26074253
show ga
Immunoassays represent one of the most popular analytical methods for detection
and quantification of biomolecules. However, conventional immunoassays such as
ELISA and flow cytometry, even though providing high sensitivity and specificity
and multiplexing capability, can be labor-intensive and prone to human error,
making them unsuitable for standardized clinical diagnoses. Using a
commercialized no-wash, homogeneous immunoassay technology ('AlphaLISA') in
conjunction with integrated microfluidics, herein we developed a microfluidic
immunoassay chip capable of rapid, automated, parallel immunoassays of microliter
quantities of samples. Operation of the microfluidic immunoassay chip entailed
rapid mixing and conjugation of AlphaLISA components with target analytes before
quantitative imaging for analyte detections in up to eight samples
simultaneously. Aspects such as fluid handling and operation, surface
passivation, imaging uniformity, and detection sensitivity of the microfluidic
immunoassay chip using AlphaLISA were investigated. The microfluidic immunoassay
chip could detect one target analyte simultaneously for up to eight samples in 45
min with a limit of detection down to 10 pg mL(-1). The microfluidic immunoassay
chip was further utilized for functional immunophenotyping to examine cytokine
secretion from human immune cells stimulated ex vivo. Together, the microfluidic
immunoassay chip provides a promising high-throughput, high-content platform for
rapid, automated, parallel quantitative immunosensing applications.