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Novel Molecularly Imprinted Electrochemical Sensor for Retrorsine Detection in Herbal Products

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— 2 min read

A novel molecularly imprinted electrochemical sensor for detecting retrorsine, a highly toxic pyrrolizidine alkaloid, in herbal products has been developed by researchers at the Izmir Institute of Technology. The sensor, which utilizes a molecularly imprinted polymer (MIPs-GCE), demonstrates high selectivity, low detection limits, and practical applicability, making it a reliable and efficient method for detecting retrorsine in the presence of twenty-eight different PA compounds. This study introduces a novel alternative to existing analytical techniques such as LC-MS/MS, HPLC, and GC-MS, offering an enhancement to chromatographic applications.

Key Takeaways:

  • The novel molecularly imprinted electrochemical sensor (MIPs-GCE) demonstrates a linear-detection range of 0.05-2 nM for retrorsine (RTS) electrochemical behavior.
  • The sensor's accuracy is validated by analyzing thyme samples, detecting RTS concentrations of 0.5168 and-0.5345 nM with a relative standard deviation (RSD) of 2.4 % and 1.9 %.
  • The sensor's selectivity is observed to be high, with a low detection limit (LOD) of 0.02869 nM.
  • The sensor's practical applicability is demonstrated through the detection of RTS in the presence of twenty-eight different PA compounds.
  • The sensor offers a reliable and efficient method for detecting retrorsine, with results closely aligning with LC-MS/MS values.
  • The research concludes that the novel sensor presents a complementary alternative to existing analytical techniques, offering an enhancement to chromatographic applications such as LC-MS/MS, HPLC, and GC-MS.
  • The sensor was developed by a team of researchers led by Ezgi Zekiye Akturk, from the Chemical Engineering Department of the Izmir Institute of Technology.
  • Additional authors for this research include Melek Tunc-Ata, Muath Njjar, Ahmet Kaya, Abdullah Akdogan, and Canan Onac.
  • The study introduces a novel method for detecting pyrrolizidine alkaloids, with a specific focus on retrorsine.

Statistics:

  • The sensor's linear-detection range for retrorsine (RTS) electrochemical behavior is between 0.05-2 nM.
  • The sensor's accuracy is validated with a relative standard deviation (RSD) of 2.4 % and 1.9 % for RTS concentrations of 0.5168 and-0.5345 nM.
  • The sensor's low detection limit (LOD) is 0.02869 nM.
  • The sensor demonstrates high selectivity, detecting RTS in the presence of twenty-eight different PA compounds.

Sources:

  • Determination of retrorsine in thyme via molecularly imprinted electrochemical sensor: Validation and comparison with chromatographic technique. Food Chemistry, 2025;488:144818.
  • NewsRx. Izmir Institute of Technology Reports Findings in Science (Determination of retrorsine in thyme via molecularly imprinted electrochemical sensor: Validation and comparison with chromatographic technique). Chemicals & Chemistry. June 13, 2025; p 1788.

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