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The contents of d-norvaline and d-tryptophan were below their respective LODs in all the analyzed samples. Quantitation of l-tryptophan and l-norvaline showed good agreement with the labeled contents except for one sample which did not show presence of l-norvaline, contrary to the label indication. © 2019 Xi'an Jiaotong University. Production and hosting by Elsevier B.V.To ensure the safety of the commercially available chenpi, a convenient and fast analytical method was developed for the determination of 133 pesticide resi