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LC-MS/MS Method for the Determination and Quantitation of Penicillin G and Its Metabolites in Citrus Fruits Affected by Huanglongbing
- Aldeek, Fadi, Rosana, Michael R., Hamilton, Zaid K., Crosswhite, Mark R., Burrows, Casey W., Singh, Sonal, Gerard, Ghislain, Hammack, Walter, Cook, Jo-Marie
- Journal of agricultural and food chemistry 2015 v.63 no.26 pp. 5993-6000
- Candidatus Liberibacter, Citrus, benzylpenicillin, citrus fruits, detection limit, greening disease, isotope labeling, metabolites, solid phase extraction, trees
- In this study, we developed and validated a method for the extraction, identification, and quantitation of penicillin G and its metabolites (penilloic acid and penillic acid) in a variety of citrus fruits by employing sequential liquid/liquid and solid-phase extraction techniques in conjunction with UHPLC-MS/MS. Two product ion transitions per analyte were required for identification, which contributes to a high degree of selectivity. Corrected recoveries of penicillin G using an isotopically labeled internal standard were 90â100% at fortification levels of 0.1, 0.25, 1, and 10 ng/g. Absolute recoveries for penillic acid and penilloic acid were 50â75% depending on the matrix used. The limit of detection (LOD) of penicillin G and its metabolites was found to be 0.1 ng/g when 2 g of citrus was extracted. This method is useful in determining residue levels of penicillin G and its metabolites in citrus trees infected with huanglongbing bacteria after antibiotic treatment.