Monitoring of organophosphorous pesticide resdues in samples of banana, papaya, and bell pepper

 

Quim. Nova 2015, 38(2), 268-273

 

Mariana F. Lemos; Mayara F. Lemos; Henrique P. Pacheco; Rodrigo Scherer^*

The objective of this paper was to monitor organophosphorus residues in samples of banana, papaya, and bell pepper from ten different markets in Vitória and Vila Velha cities (Espírito Santo, Brazil) during a three-month period.

http://dx.doi.org/10.5935/0100-4042.20150005

Publicado online: janeiro 16, 2015

Quim. Nova, Vol. 38, No. 2, 268-273, 2015

Nota Técnica http://dx.doi.org/10.5935/0100-4042.20150005

*e-mail: rodrigo.scherer@uvv.br

MONITORING OF ORGANOPHOSPHOROUS PESTICIDE RESDUES IN SAMPLES OF BANANA, PAPAYA, AND BELL PEPPER

Mariana F. Lemos, Mayara F. Lemos, Henrique P. Pacheco and Rodrigo Scherer* Departamento de Farmácia, Universidade Vila Velha, Rua Comissário José Dantas de Melo, 21, 29102-770 Vitória – ES, Brasil

Recebido em 11/07/2014; aceito em 16/10/2014; publicado na web em 16/01/2015

The objective of this study was to monitor 11 organophosphorus pesticides in samples of papaya, bell pepper, and banana, commercialized in the metropolitan area of Vitória (ES, Brazil). The pesticides were determined by an optimized and validated method using high performance liquid chromatography with tandem mass spectrometry (HPLC-MS/MS). All three samples exhibited a matrix effect for most of the pesticides, mainly with signal suppression, and therefore the calibration curves were produced in matrices. Linearity revealed coefficients of determination (r²) greater than 0.9895 for all pesticides and recovery results ranged from between 76% and 118% with standard deviation no greater than 16%. Precision showed relative standard deviation values lower than 19% and HorRat values lower than 0.7, considering all pesticides. Limits of quantification were less than 0.01 mg/kg for all pesticides. Regarding analysis of the samples (50 of each), none of the pesticides exceeded the maximum residue limit determined by Brazilian legislation.

Keywords: QuEChERS; Capsicum annuum; Musa spp.; Carica papaya; pesticide analysis.

Departamento de Farmácia, Universidade Vila Velha, Rua Comissário José Dantas de Melo

Vitamin D prevents diabetes and clogged arteries in mice

CLINICALNEWS.ORG

Washington University School of Medicine

In recent years, a deficiency of vitamin D has been linked to type 2 diabetes and heart disease, two illnesses that commonly occur together and are the most common cause of illness and death in Western countries. Both disorders are rooted in chronic inflammation, which leads to insulin resistance and the buildup of artery-clogging plaque.

Now, new research in mice at Washington University School of Medicine in St. Louis suggests vitamin D plays a major role in preventing the inflammation that leads to type 2 diabetes and atherosclerosis. Further, the way key immune cells behave without adequate vitamin D may provide scientists with new therapeutic targets for patients with those disorders.

The study appears March 19 in the journal Cell Reports.

Studying mice that lacked the ability to process vitamin D in immune cells involved in inflammation, the researchers found that the animals made…

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