Barcode DNA-Mediated Signal Amplifying Strategy for Ultrasensitive Biomolecular Detection on Matrix-Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry

We have devised a barcode DNA-mediated signal amplifying strategy for ultrasensitive biomolecular detection by utilizing matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). As a model target, thrombin was first captured by specific aptamer15 functionalized on...

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Published inAnalytical chemistry (Washington) Vol. 89; no. 17; pp. 8966 - 8973
Main Authors Ahmad, Raheel, Jang, Hyowon, Batule, Bhagwan S, Park, Hyun Gyu
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 05.09.2017
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Abstract We have devised a barcode DNA-mediated signal amplifying strategy for ultrasensitive biomolecular detection by utilizing matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). As a model target, thrombin was first captured by specific aptamer15 functionalized on magnetic beads (MBs-apt15) and sandwiched through the simultaneous interaction with gold nanoparticles modified with another specific aptamer29 and barcode DNA molecules (apt29-AuNPs-bcDNAs). The sandwiched complex was collected by convenient magnetic separation and then treated with potassium cyanide (KCN) to dissolve the gold nanoparticles (AuNPs) and consequently release the barcode DNA molecules (bcDNAs), which were then again magnetically separated and analyzed by using MALDI-TOF MS. Under optimized conditions, this strategy revealed an excellent sensitivity with a limit of detection of 0.89 aM in a wide linear detection range from 0 aM to 0.1 nM and exhibited an acceptable recovery for thrombin detection in complex biological matrices. This signal amplifying strategy based on MALDI-TOF MS could greatly enable the ultrasensitive detection of various low abundant biomolecules.
AbstractList We have devised a barcode DNA-mediated signal amplifying strategy for ultrasensitive biomolecular detection by utilizing matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). As a model target, thrombin was first captured by specific aptamer15 functionalized on magnetic beads (MBs-apt15) and sandwiched through the simultaneous interaction with gold nanoparticles modified with another specific aptamer29 and barcode DNA molecules (apt29-AuNPs-bcDNAs). The sandwiched complex was collected by convenient magnetic separation and then treated with potassium cyanide (KCN) to dissolve the gold nanoparticles (AuNPs) and consequently release the barcode DNA molecules (bcDNAs), which were then again magnetically separated and analyzed by using MALDI-TOF MS. Under optimized conditions, this strategy revealed an excellent sensitivity with a limit of detection of 0.89 aM in a wide linear detection range from 0 aM to 0.1 nM and exhibited an acceptable recovery for thrombin detection in complex biological matrices. This signal amplifying strategy based on MALDI-TOF MS could greatly enable the ultrasensitive detection of various low abundant biomolecules.
Author Jang, Hyowon
Batule, Bhagwan S
Park, Hyun Gyu
Ahmad, Raheel
AuthorAffiliation Department of Chemical and Biomolecular Engineering (BK 21+ program)
AuthorAffiliation_xml – name: Department of Chemical and Biomolecular Engineering (BK 21+ program)
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  givenname: Raheel
  surname: Ahmad
  fullname: Ahmad, Raheel
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  givenname: Hyowon
  surname: Jang
  fullname: Jang, Hyowon
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  givenname: Bhagwan S
  surname: Batule
  fullname: Batule, Bhagwan S
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  givenname: Hyun Gyu
  orcidid: 0000-0001-9978-3890
  surname: Park
  fullname: Park, Hyun Gyu
  email: hgpark@kaist.ac.kr
BackLink https://www.ncbi.nlm.nih.gov/pubmed/28780857$$D View this record in MEDLINE/PubMed
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Snippet We have devised a barcode DNA-mediated signal amplifying strategy for ultrasensitive biomolecular detection by utilizing matrix-assisted laser desorption...
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SubjectTerms Amplification
Aptamers
Beads
Biomolecules
Chemistry
Cyanides
Deoxyribonucleic acid
Desorption
DNA
Gold
Ionization
Magnetic separation
Mass spectrometry
Mass spectroscopy
Molecules
Nanoparticles
Potassium
Potassium cyanide
Spectroscopy
Strategy
Thrombin
Title Barcode DNA-Mediated Signal Amplifying Strategy for Ultrasensitive Biomolecular Detection on Matrix-Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry
URI http://dx.doi.org/10.1021/acs.analchem.7b01535
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