title: Ready-to-use strip for L-ascorbic acid visual detection based on polyaniline/polyamide 66 nano-fibers/nets membranes.
abstract: A ready-to-use L-ascorbic acid (L-AA) colorimetric strip based on polyaniline (PANI)/polyamide 66 (PA 66) nanofiber/net (NFN) membrane with spider-web-like structure was fabricated through a facile bend electrospinning/netting process. Introduction of PANI component into the membrane turns the strip undergoes a brilliant brown-to-green color transition within 30 min upon incubation with L-AA. Moreover, ascribing to the three-dimensional microscopic structural, continuous pore channels, and distinctive nano-nets structure, the color change that is caused by 50 ppb L-AA can be easily perceived by naked eyes. Furthermore, RGB (red-green-blue) digital parameters that obtained from photographs of the strips were automatically read out via an iPhone. Subsequently, the parameters were converted into a color-difference map and processed statistically through principal component analysis, then used to elaborate standard curve. Combining the map and curve, we realized a method for assaying and quantifying L-AA concentration in real food samples, which avoids the time-consuming sample preparation, expensive laboratory techniques, and specialized personnel needed to carry out conventional analytical methods.
authors.affiliation: Key Laboratory of Textile Science &Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China.
authors.forename: Yanan
authors.initials: Y
authors.lastname: Wen
authors.affiliation: Key Laboratory of Textile Science &Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Nanomaterials Research Center, Modern Textile Institute, Donghua University, Shanghai 200051, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Si
authors.affiliation: Nanomaterials Research Center, Modern Textile Institute, Donghua University, Shanghai 200051, China.
authors.forename: Xueqin
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key Laboratory of Textile Science &Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China.
authors.forename: Faxue
authors.initials: F
authors.lastname: Li
authors.affiliation: Nanomaterials Research Center, Modern Textile Institute, Donghua University, Shanghai 200051, China.
authors.forename: Jianyong
authors.initials: J
authors.lastname: Yu
authors.affiliation: Key Laboratory of Textile Science &Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China; Nanomaterials Research Center, Modern Textile Institute, Donghua University, Shanghai 200051, China. Electronic address: binding@dhu.edu.cn.
authors.forename: Bin
authors.initials: B
authors.lastname: Ding
mesh_terms: D000577:Amides / Q000737:chemistry*; D000814:Aniline Compounds / Q000737:chemistry*; D001205:Ascorbic Acid / Q000032:analysis*; D003124:Colorimetry / Q000295:instrumentation*; D005504:Food Analysis; D000067030:Fruit and Vegetable Juices / Q000032:analysis; D008567:Membranes, Artificial; D057139:Nanofibers / Q000737:chemistry*; D011934:Reagent Strips / Q000737:chemistry*
chemical_list: D000577:Amides; D000814:Aniline Compounds; D008567:Membranes, Artificial; D011934:Reagent Strips; C416807:polyaniline; D001205:Ascorbic Acid
keywords: Colorimetric strip; L-ascorbic acid detection; Polyaniline; electrospun nanofiber/nets