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Liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (QTOF/MS) assay for quantification of protodioscin in Brachiaria grasses.

A new interesting article has been published in Toxicon. 2018 Oct 19. pii: S0041-0101(18)30407-0. doi: 10.1016/j.toxicon.2018.10.008. [Epub ahead of print] and titled:

Liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (QTOF/MS) assay for quantification of protodioscin in Brachiaria grasses.

Authors of this article are:

Diamantino GML, Biscoto GL, Pedroza HP, Amorim RNL, Keller KM, Melo MM, Soto-Blanco B.

A summary of the article is shown below:

This work aimed to develop and validate a method to detect and quantify protodioscin in Brachiaria grasses using ultraperformance liquid chromatography (UPLC) coupled to high-resolution quadrupole time-of-flight mass spectrometry. Samples were extracted by acetonitrile-water 50:50 v/v mixture and ultrasonication. The mobile phase consisted of 5 mM ammonium acetate in water-methanol and acetonitrile containing 0.1% formic acid. The parameters used to validate the method for determining protodioscin comprised determination of the selectivity, ionization suppression/enhancement (matrix effect), linearity of the calibration curve, the limit of detection (LOD), the lower limit of quantitation (LLOQ), and the precision and accuracy of the method. The LLOQ of protodioscin was determined as 0.1 μg mL-1, and the LOD was 0.03 μg mL-1. The developed method was applied for determining protodioscin levels in B. decumbens collected from three pastures where sheep showed clinical signs of photosensitization. The obtained values ranged from 0.71% to 1.12%. Thus, the developed method for determining protodioscin in Brachiaria grasses by LC coupled to high-resolution quadrupole time-of-flight mass spectrometry showed high accuracy, precision, and sensitivity.

Check out the article’s website on Pubmed for more information:



This article is a good source of information and a good way to become familiar with topics such as:

High-resolution mass spectrometry;LC-QTOF/MS;Plant secondary metabolites;Plant toxins;Quadrupole time-of-flight mass spectrometry;Saponins

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