Release of Covalently Bound Metabolites of Organophosphate Pesticides from Synthetic Dialkylphosphoseryl Peptides by Supercritical Fluid Extraction
作者:Alenka Paquet、Shahamat U. Khan
DOI:10.1021/jf00051a054
日期:1995.3
Two model peptides immobilized on a solid support (Wang resin), Boc-Ser(PO(3)Et(2))-Phe-Wang and Boc-Ser(PO(3)Ph(2))-Phe-Wang, and two nonimmobilized compounds, Boc-Ser(PO(3)Et(2))-OBzl and Boc-Ser(PO(3)Et(2))-Phe-OBzl, were prepared and subjected to a supercritical fluid extraction (SFE) process. Approximately one-third of the immobilized peptides were cleaved from the resin, and the alkyl-substituted phosphoseryl moieties were identified in the distillates by means of H-1- and P-31-NMR spectroscopy. The peptides that were not immobilized were redistilled during the SFE without any changes in their structures. The results indicate that metabolites of organophosphate pesticides covalently bound to serine residues in a protein chain in plants or grains could be released by SFE.