The effects of pH and surfactants on the absorption and fluorescence properties of ochratoxin A and zearalenone

Cited 7 time in scopus
Metadata Downloads
Title
The effects of pH and surfactants on the absorption and fluorescence properties of ochratoxin A and zearalenone
Author(s)
T Li; Bo Bae Kim; Tai Hwan HaYong Beom Shin; M G Kim
Bibliographic Citation
Luminescence, vol. 30, no. 7, pp. 1106-1111
Publication Year
2015
Abstract
The pH and surfactant dependencies of the absorption and fluorescence properties of ochratoxin A (OTA) and zearalenone (ZEN), the main mycotoxins found as contaminants in foods and feeds, were evaluated. Three surfactants with different ionic properties were investigated, namely sodium dodecyl sulfate (SDS, anionic), Tween 20 (nonionic) and hexadecyltrimethylammonium bromide (CTAB, cationic). The results show that the effects of pH on the absorption wavelength maxima and fluorescence efficiencies of the mycotoxins, which are a consequence of the presence of acidic phenol and/or carboxyl containing fluorophores, are dependent on the ionic nature of the added surfactants. Specifically, the fluorescence responses to pH changes of OTA and ZEN are similar in the presence or absence of Tween 20 and SDS. By contrast, the pH-dependent fluorescence properties of these mycotoxins are altered when CTAB is present in the solutions. Moreover, unlike OTA, ZEN in aqueous solution displays almost no fluorescence. However, fluorescence enhancement takes place when surfactants are present in aqueous solutions of this mycotoxin. The results of this study demonstrate that the different microenvironments, present in the organized micellar systems created by the individual surfactants, can be potentially employed to modulate the sensitivities and selectivities of the fluorescence detection of OTA or ZEN.
Keyword
fluorescencemycotoxinochratoxin ApHsurfactantzearalenone
ISSN
1522-7235
Publisher
Wiley
DOI
http://dx.doi.org/10.1002/bio.2866
Type
Article
Appears in Collections:
Division of Biomaterials Research > Bionanotechnology Research Center > 1. Journal Articles
Files in This Item:
  • There are no files associated with this item.


Items in OpenAccess@KRIBB are protected by copyright, with all rights reserved, unless otherwise indicated.