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A SERS nano-tag-based magnetic-separation strategy for highly sensitive immunoassay in unprocessed whole blood
- Zhao, Peng, Li, Han-xia, Li, Da-wei, Hou, Ya-jun, Mao, Leilei, Yang, Mingfeng, Wang, Ying
- Talanta 2019 v.198 pp. 527-533
- biomarkers, biosensors, blood, blood sampling, diagnostic techniques, immunoassays, magnetic separation, metalloproteinases, nanosilver, neoplasms, screening, silver
- Assay technologies capable of detecting biomarker concentrations in unprocessed whole blood samples are fundamental for applications in medical diagnostics. SERS nano-tags integrated magnetic-separation biosensor (MSB) was realized for the first time for immunoassay in whole blood. The reliability and sensitivity of this method rely, in a large extent, on the quality and properties of the SERS nano-tags. The constructed silicacoated Ag SERS nano-tags as labels were used in a rapid and specific MSB immune sensor to detect Matrix Metalloproteinases 9 (MMP-9) in unprocessed blood samples. With fast screening ability and outstanding sensitivity, we anticipate that this method would greatly promote practical application of stroke-based early-stage cancer diagnosis.