Pyrrole-Based Extraction Materials for Microcystin Separation and Analysis


Project ID:  D2018-20



When water conditions are favorable for cyanobacteria growth, harmful algae blooms (HAB) can result, causing elevated levels of toxins called microcystins (MCs). There are over 140 microcystin variants. The EPA suggests that MC-LR variant concentration in drinking water should be less than 0.3 ug/L. Trace levels of MCs can be invisible to traditional detection techniques unless preconcentration of MCs is performed. Currently, enzyme-linked immunosorbent assay (ELISA) is used to detect MCs in water. This method relies on ADDA group identification and therefore is a measure of all microcystin variants. Liquid chromatography-mass spectrometry (LC-MS) is a more sensitive method for quantification than ELISA, but is challenged by sample preparation. In order to protect against HAB, there needs to be a method for preconcentrating water and patient samples in order to bring limits of detection within a meaningful range.


Invention Description

Researchers at the University of Toledo have developed an accurate, reproducible and efficient technique for preconcentrating MCs. A novel pyrrole-based nanocomposite extraction coating is highly selective for various analytes, including bioanalytes such as MC. Extraction capabilities in solid-phase extraction and microextraction allow for a quantitative trace analysis, even in complex matrices, such as lake water, blood, or urine. By preconcentrating samples, the more sensitive method for quantification of MCs, LC-MS can be utilized. Using this technique lowers the detection limit well below EPA recommendations for safe drinking water, allowing for early warnings and better response times.



•       Sample prep/preconcentration for quantifying via LC-MS analysis

•       Water purification and detection of microcystins

•       Diagnostic for MC exposure

•       Sampling of MCs

•       Robust and sensitive, even in complex matrices

•       Can separate hydrophilic and hydrophobic MCs



•       Excellent MC recoveries

•       Excellent Limit of Detection (0.8 ng/L) and Limits of Quantification (2.5 ng/L)

•       Small amounts of nanocomposite are needed


IP Status:       Patents Pending


Publications:       Isailovic D, et al. Improved solid-phase extraction protocol and sensitive quantification of six microcystins in water using an HPLC-orbitrap mass        spectrometry system Anal. Methods, 2017,9, 2021-2030

              Kirchhoff J, et al. Solid-phase extraction, quantification, and selective determination of microcystins in water with a gold-polypyrrole nanocomposite sorbent material. J. Chromatogr. A, (2018) (1560) 1-9.



Patent Information:
For Information, Contact:
Katherine Pollard
Licensing Associate
The University of Toledo
Jon Kirchhoff
Amila Devasurendra
Jared Anderson
Dirukshika Palagama
Dragan Isailovic
Joshua Young
Solid-phase extraction
Solid-phase microextraction
Water filtration