학술논문
Immunoassay-Amplified Responses Using a Functionalized Mo[S.sub.2]-Based SPR Biosensor to Detect PAPP-A2 in Maternal Serum Samples to Screen for Fetal Down's Syndrome
ORIGINAL RESEARCH
ORIGINAL RESEARCH
Document Type
Academic Journal
Author
Source
International Journal of Nanomedicine. April 30, 2021, Vol. 16, p2715, 19 p.
Subject
Language
English
ISSN
1178-2013
Abstract
Introduction Advanced maternal age and late marriage have become a global trend, (1) and this phenomenon has led to an increase in maternal pregnancy diseases such as gestational diabetes, gestational [...]
Background: Due to educational, social and economic reasons, more and more women are delaying childbirth. However, advanced maternal age is associated with several adverse pregnancy outcomes, and in particular a high risk of Down's syndrome (DS). Hence, it is increasingly important to be able to detect fetal Down's syndrome (FDS). Methods: We developed an effective, highly sensitive, surface plasmon resonance (SPR) biosensor with biochemically amplified responses using carboxyl-molybdenum disulfide (Mo[S.sub.2]) film. The use of carboxylic acid as a surface modifier of Mo[S.sub.2] promoted dispersion and formed specific three-dimensional coordination sites. The carboxylic acid immobilized unmodified antibodies in a way that enhanced the bioaffinity of Mo[S.sub.2] and preserved biorecognition properties of the SPR sensor surface. Complete antigen pregnancy- associated plasma protein-A2 (PAPP-A2) conjugated with the carboxyl-Mo[S.sub.2]-modified gold chip to amplify the signal and improve detection sensitivity. This heterostructure interface had a high work function, and thus improved the efficiency of the electric field energy of the surface plasmon. These results provide evidence that the interface electric field improved performance of the SPR biosensor. Results: The carboxyl-Mo[S.sub.2]-based SPR biosensor was used successfully to evaluate PAPP-A2 level for fetal Down's syndrome screening in maternal serum samples. The detection limit was 0.05 pg/mL, and the linear working range was 0.1 to 1100 pg/mL. The women with an SPR angle >46.57 m[degrees] were more closely associated with fetal Down's syndrome. Once optimized for serum Down's syndrome screening, an average recovery of 95.2% and relative standard deviation of 8.5% were obtained. Our findings suggest that carboxyl-Mo[S.sub.2]-based SPR technology may have advantages over conventional ELISA in certain situations. Conclusion: Carboxyl-Mo[S.sub.2]-based SPR biosensors can be used as a new diagnostic technology to respond to the increasing need for fetal Down's syndrome screening in maternal serum samples. Our results demonstrated that the carboxyl-Mo[S.sub.2]- based SPR biosensor was capable of determining PAPP-A2 levels with acceptable accuracy and recovery. We hope that this technology will be investigated in diverse clinical trials and in real case applications for screening and early diagnosis in the future. Keywords: carboxyl-functionalized molybdenum disulfide, carboxyl-Mo[S.sub.2], surface plasmon resonance, SPR, pregnancy-associated plasma protein A2, PAPP-A2, Down's syndrome, DS, fetal Down's syndrome, FDS
Background: Due to educational, social and economic reasons, more and more women are delaying childbirth. However, advanced maternal age is associated with several adverse pregnancy outcomes, and in particular a high risk of Down's syndrome (DS). Hence, it is increasingly important to be able to detect fetal Down's syndrome (FDS). Methods: We developed an effective, highly sensitive, surface plasmon resonance (SPR) biosensor with biochemically amplified responses using carboxyl-molybdenum disulfide (Mo[S.sub.2]) film. The use of carboxylic acid as a surface modifier of Mo[S.sub.2] promoted dispersion and formed specific three-dimensional coordination sites. The carboxylic acid immobilized unmodified antibodies in a way that enhanced the bioaffinity of Mo[S.sub.2] and preserved biorecognition properties of the SPR sensor surface. Complete antigen pregnancy- associated plasma protein-A2 (PAPP-A2) conjugated with the carboxyl-Mo[S.sub.2]-modified gold chip to amplify the signal and improve detection sensitivity. This heterostructure interface had a high work function, and thus improved the efficiency of the electric field energy of the surface plasmon. These results provide evidence that the interface electric field improved performance of the SPR biosensor. Results: The carboxyl-Mo[S.sub.2]-based SPR biosensor was used successfully to evaluate PAPP-A2 level for fetal Down's syndrome screening in maternal serum samples. The detection limit was 0.05 pg/mL, and the linear working range was 0.1 to 1100 pg/mL. The women with an SPR angle >46.57 m[degrees] were more closely associated with fetal Down's syndrome. Once optimized for serum Down's syndrome screening, an average recovery of 95.2% and relative standard deviation of 8.5% were obtained. Our findings suggest that carboxyl-Mo[S.sub.2]-based SPR technology may have advantages over conventional ELISA in certain situations. Conclusion: Carboxyl-Mo[S.sub.2]-based SPR biosensors can be used as a new diagnostic technology to respond to the increasing need for fetal Down's syndrome screening in maternal serum samples. Our results demonstrated that the carboxyl-Mo[S.sub.2]- based SPR biosensor was capable of determining PAPP-A2 levels with acceptable accuracy and recovery. We hope that this technology will be investigated in diverse clinical trials and in real case applications for screening and early diagnosis in the future. Keywords: carboxyl-functionalized molybdenum disulfide, carboxyl-Mo[S.sub.2], surface plasmon resonance, SPR, pregnancy-associated plasma protein A2, PAPP-A2, Down's syndrome, DS, fetal Down's syndrome, FDS