Naked eye screening of 11 phenolic compounds and colorimetric determination using polydiacetylene vesicles with alpha-cyclodextrin

作者：Anekthirakun Pimpimon; Sukwattanasinitt Mongkol; Tuntulani Thawatchai; Imyim Apichat^*

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2013, 111: 91-96.

DOI：10.1016/j.saa.2013.03.087

• Polydiacetylene vesicles
• Cyclodextrin
• Colorimetry
• Phenolic compounds

The calorimetric response (CR) of poly(10,12-pentacosadiynoic acid) vesicles (PPCDA) induced by alpha-cyclodextrin (alpha-CD) in an aqueous solution has been studied. Various parameters affecting the CR, such as response time and concentration were investigated. The blue color of 0.01 mM PPCDA solution became pinkish red with the addition of alpha-CD at the concentration higher than 3 mM. The inhibition of the color transition from blue to red was investigated using 11 phenolic compounds. The color transition could be inhibited and observed by naked eye in the presence of 4 phenolic compounds, i.e. 4-nitrophenol (4-NP) and 4-bromophenol (4-BP) and 4-chlorophenol (4-CP) and 3-nitrophenol (3-NP). A colorimetric method for the determination of these compounds was validated and applied for surface water analysis. The linear range from the plot of CR against phenolic compounds concentration was in the order of 0.5-2.0 mM with R-2 more than 0.99. The recoveries were 90-95% with good precision (1-4%RSD, n = 10).

• 出版日期2013-7