Fabrication and testing of a PDMS multi-stacked hand-operated LOC for use in portable immunosensing systems.
This paper presents the development of a reliable multi-liquid lab-on-a-chip (LOC), with a hand-operated mechanism, for the application in portable immunosensing systems. To control the transport of multiple liquids without any external equipment, we utilize capillary attraction force for filling and surface tension for stopping liquid flow. As a driving force, hydraulic pressure caused by the elastic deformation of a liquid reservoir transfers liquid stopped at passive valves. The proposed LOC successfully demonstrates a reliable sequential liquid transfer within the reaction channel. To highlight its feasibility as a portable diagnostic system, we performed the electrochemical immunoassay measuring antibody concentrations within the fabricated LOC. As a test biorecognition reaction, the anti-dinitrophenyl (DNP) antibody with an enzymatic catalysis was selected as the target analyte. The amplified signals obtained from this experiment indicated a high selectivity of the immunosensing LOC.
Division of Electrical & Computer Engineering, Ajou University, Suwon, South Korea.
Sin Wook
SW
Park
Department of Molecular Science & Technology, Ajou University, Suwon, South Korea.
Jun Hwang
JH
Lee
Department of Molecular Science & Technology, Ajou University, Suwon, South Korea.
Hyun C
HC
Yoon
Department of Chemical Engineering, Sungkyunkwan University, Suwon, South Korea.
Byung Woo
BW
Kim
Department of Chemical Engineering, Sungkyunkwan University, Suwon, South Korea.
Sang Jun
SJ
Sim
Department of Chemical Engineering, Sungkyunkwan University, Suwon, South Korea.
Heeyeop
H
Chae
Division of Electrical & Computer Engineering, Ajou University, Suwon, South Korea. ssyang@ajou.ac.kr.
Sang Sik
SS
Yang
D000818:Animals; D000906:Antibodies / Q000737:chemistry*; D004136:Dinitrobenzenes / Q000032:analysis*; D007124:Immunoenzyme Techniques / Q000295:instrumentation* / Q000379:methods*; D046208:Microchip Analytical Procedures / Q000379:methods*; D012680:Sensitivity and Specificity
D000906:Antibodies; D004136:Dinitrobenzenes