Rapid Screening and Quantitation of Postharvest Fungicides on Citrus Fruit Using AxION DSA/TOF and Flexar SQ MS

Rapid Screening and Quantitation of Postharvest Fungicides on Citrus Fruits Using AxION DSA/TOF and Flexar SQ MS

Biological control of postharvest diseases of fruits.

Losses from postharvest fruit diseases range from 1 to 20 percent in the United States, depending on the commodity. The application of fungicides to fruits after harvest to reduce decay has been increasingly curtailed by the development of pathogen resistance to many key fungicides, the lack of replacement fungicides, negative public perception regarding the safety of pesticides and consequent ...

Integrated Approaches to Postharvest Disease Management in California Citrus Packinghouses

Practices in the citrus industry evolve rapidly to minimize postharvest decay losses, mostly a result of green mold or blue mold, caused by Penicillium digitatum or P. italicum, respectively. Current problems include the continued development of fungicide resistance among these pathogens, and compliance with emerging secondary residue standards and other privatized regulation of production and ...

Automated Direct Sample Analysis (DSA/TOF) for the Rapid Testing of Drug Compounds

Testing methods for drugs currently require long chromatographic methods and sample preparation or immunoassay techniques (EMIT) with confirmation by GC/MS or LC/MS/MS. These methods can be timeconsuming and laborious. The majority of urine testing methods cover only a limited number of metabolites, since reference standards are poorly available, making it difficult to keep up with the changing...

Discovering metabolites of post-harvest fungicides in citrus with liquid chromatography/time-of-flight mass spectrometry and ion trap tandem mass spectrometry.

In this study, we benefit from the combination of liquid chromatography (LC)/time-of-flight (TOF) MS accurate mass measurements to generate elemental compositions of ions and LC/ion trap multiple MS (MSn) providing complementary structural information, which is useful for the elucidation of unknown organic compounds at trace levels in complex food extracts. We have applied this approach to inve...