A new method for quantifying causative and diagnostic markers of methylenecyclopropylglycine poisoning.

ABSTRACT:

Background

Up to now quantification of hypoglycin A in serum and urine in the range of nmols to ?mols per liter plus the measurement of accumulated acyl conjugates have been used for the diagnosis of poisoning by fruits or seeds ofSapindaceae in humans and animals. A second poison, methylenecyclopropylglycine, however, is known to occur in this material. The objective of our study was to develop and evaluate a method for the quantification of this compound suitable for test materials obtained from animals and man.

Method

Methylenecyclopropylglycine was extracted from serum and urine of a volunteer by a methanolic solution containing labeled methylenecyclopropylglycine as internal standard. UPLC-MS/MS analysis was performed after butylation.

Results

Lower limits of detection and quantification were found at 0.5 and 2.5?nmol/L respectively in both urine and serum for each of two isomers, linearity of results (r² > 0.998) was demonstrated for the range of 0.5-500?nmol/L in urine and serum.The method was applied to urine and serum of horses poisoned by Acer seeds, methylenecyclopropylglycine was found in addition to hypoglycin A. Methylenecyclopropylformyl glycine, a metabolite of methylenecyclopropylglycine, however, was present in much higher concentrations than methylenecyclopropylglycine in all but one samples.

Conclusions

Quantification of methylenecyclopropylglycine can be successfully integrated into our established analytical procedure used for clinical diagnosis of Sapindaceae poisoning. The extended method will improve disease evaluation in humans and animals.

SUBMITTER: Sander J 

PROVIDER: S-EPMC6699453 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature