“…Carbon nanotubes (CNTs), including single-wall carbon nanotube (SWNT) and multi-wall carbon nanotube (MWNT), have obtained wide applications in electrochemical detection owing to the distinctive properties (Chen et al, 2009;Gan, Li, & Wu, 2008;Goyal & Singh, 2008;Sims, Li, Kachoosangi, Wildgoose, & Compton, 2009;Sun et al, 2009;Wan, Wang, Yu, Wang, & Yang, 2009;Zheng, Hu, Peng, & Hu, 2009). However, to the best of our knowledge, electrochemical detection of Ponceau 4R and Allura Red using carbon nanotube film has not been reported.…”