Journal: Sensors (Basel, Switzerland)
Article Title: Aptamer Conformation Switching-Induced Two-Stage Amplification for Fluorescent Detection of Proteins
Figure Lengend Snippet: The fluorescence spectrum of the developed sensing system is collected in a blank control sample (curve “a”); in the presence of aptamer DNA, an MB, polymerase, and nicking endonuclease, but without PDGF-BB (curve “b”); in the presence of PDGF-BB, aptamer DNA, and an MB (curve “c”); in the presence of PDGF-BB, aptamer DNA, an MB, and polymerase (curve “d”); and in the presence of PDGF-BB, aptamer DNA, MB, polymerase, and nicking endonuclease Nt.BbvCI (curve “e”). The reaction is in an NEB buffer (pH 7.9) at 37 °C for 2 h containing 1 μM aptamer DNA, 1 μM MB, 2.5 μM primer, 100 ng/mL PDGF-BB, 1 U/μL Klenow Fragment exo-, 2 mM dNTPs, and 1 U/μL Nt.BbvCI.
Article Snippet: The deoxynucleotide solution mixture (dNTPs), polymerase Klenow Fragment exo- (10 U/μL) accompanied by 10× Klenow Fragment exo- buffer, and the nicking endonuclease Nt.BbvCI accompanied by 10× New England Biolabs (NEB) buffer were purchased from New England Biolabs Ltd (Beijing, China).