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A portable oligonucleotide-based microfluidic device for the detection of VEGF(165) in a three-step suspended-droplet mode
Ko, CN1; Sun, H1; Wu, KJ2; Leung, CH2; Ren, KN1; Ma, DL1
2019
Source PublicationDALTON TRANSACTIONS
ISSN1477-9226
Volume48Issue:26Pages:9824-9830
AbstractVascular endothelial growth factor (VEGF(165)), an important glycosylated protein from the VEGF family, is a type of signal protein highly associated with the development and progression of cancers. In this work, we designed a G-quadruplex-based aptasensing platform for the sensitive and selective detection of VEGF(165) in aqueous solution and red blood cell solution. A long-lived phosphorescence iridium(iii) complex (1) with promising photophysical properties and a large Stokes shift was chosen as a selective G-quadruplex probe. The platform could achieve a limit of detection (LOD) down to the picomolar level using a conventional fluorometer. Furthermore, we successfully applied the platform to a three-step suspended droplet (SD)-based microfluidic device for the monitoring of VEGF(165). In contrast to the channel-based and digital microfluidic chips, SD-based chips allow easy introduction of liquid samples, valve-free manipulation of multiple reaction steps and flexible volume range. Importantly, polypropylene (PP), a hydrophobic and thermally stable material, was chosen as a substrate to fabricate the chip for the SD-based microfluidic device. The PP-based chip allows the combination of superhydrophobic force, gravity and surface tension for effective driving of the suspended droplet throughout the channel without reverse migration. After assembling all the major components, including a UV lamp, a rotatable chip holder, a filter and a camera into the portable device, we successfully demonstrated the applicability of the device to detect VEGF(165) in aqueous solution with a LOD of 0.33 nM at a signal-to-noise ratio (S/N) of 3 and a linear range of 1-100 nM.
DOI10.1039/c9dt00427k
Indexed BySCI
Language英语
WOS Research AreaChemistry
WOS SubjectChemistry, Inorganic & Nuclear
WOS IDWOS:000473920400040
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Document TypeJournal article
CollectionInstitute of Chinese Medical Sciences
Affiliation1.Hong Kong Baptist Univ, Dept Chem, Kowloon Tong, Hong Kong, Peoples R China
2.University of Macau, Inst Chinese Med Sci, State Key Lab Qual Res Chinese Med, Macau, Peoples R China
Recommended Citation
GB/T 7714
Ko, CN,Sun, H,Wu, KJ,et al. A portable oligonucleotide-based microfluidic device for the detection of VEGF(165) in a three-step suspended-droplet mode[J]. DALTON TRANSACTIONS,2019,48(26):9824-9830.
APA Ko, CN,Sun, H,Wu, KJ,Leung, CH,Ren, KN,&Ma, DL.(2019).A portable oligonucleotide-based microfluidic device for the detection of VEGF(165) in a three-step suspended-droplet mode.DALTON TRANSACTIONS,48(26),9824-9830.
MLA Ko, CN,et al."A portable oligonucleotide-based microfluidic device for the detection of VEGF(165) in a three-step suspended-droplet mode".DALTON TRANSACTIONS 48.26(2019):9824-9830.
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