Abstract
A new and reliable method for the simultaneous determination of nine plant growth regulators in navel oranges was developed by liquid chromatography-triple quadrupole tandem mass (QqQ LC/MS). Extraction was performed by acetone and ethyl acetate (v/v, 1:2) with microwave-assisted extraction technique. Cleanup of extracts was performed with dispersive-solid phase extraction (d-SPE) using active carbon as the sorbent. The identification of each analyte was established by chromatographic retention time, analyte-specific fragmentation patterns, and relative peak area ratios of precursor/production pairs. Under the optimized conditions, the average recoveries (six replicates), except for methyl naphthacetate, were in the range of 61.0–109.4 % and limits of detection ranging from 0.01 to 162.2 μg kg−1. The results demonstrated that the developed QqQ LC/MS, extraction and purification method is highly effective for analyzing trace amounts of target plant growth regulators (PGRs) in navel orange samples.
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