Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 3, Pages 2449-2455Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b12860
Keywords
gold nanoparticles; surface-enhanced Raman spectroscopy; active ricin; depurination; on-site detection
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB14020101]
- National Major Instrument Project of the Ministry of Science and Technology of China [2011YQ03012411]
- National Natural Science Foundation of China [21207142, 21321004, 81202248]
- China Postdoctoral Science Foundation [2012M510048]
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Quick and accurate on-site detection of active ricin has very important realistic significance in view of national security and defense. In this paper, optimized single-stranded oligodeoxynucleotides named poly(21dA), which function as a depurination substrate of active ricin, were screened and chemically attached on gold nanoparticles (AuNPs, similar to 100 nrn) via the Au-S bond [poly(21dA)-AuNPs]. Subsequently, poly(21dA) AuNPs were assembled on a dihydrogen lipoic-acid-modified Si wafer (SH-Si), thus forming the specific surface-enhanced Raman spectroscopy (SERS) chip [poly(21dA)-AuNPs@SH-Si] for depurination of active ricin. Under optimized conditions, active ricin could specifically hydrolyze multiple adenines from poly(21dA) on the chip. This depurination-induced composition change could be conveniently monitored by measuring the distinct attenuation of the SERS signature corresponding to adenine. To improve sensitivity of this method, a silver nanoshell was deposited on post-reacted poly(21dA)-AuNPs, which lowered the limit of detection to 8.9 ng mL(-1). The utility of this well controlled SERS chip was successfully demonstrated in food and biological matrices spiked with different concentrations of active ricin, thus showing to be very promising assay for reliable and rapid on-site detection of active ricin.
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