A new ultra high performance liquid chromatography coupled with tandem mass spectrometry method for a fast and sensitive determination of eight polyphenols (hydroxytyrosol, catechin, epicatechin, epigallocatechin gallate, oleuropein, quercetin, rutin, tyrosol) and panthotenic acid in extra-virgin olive oil was developed. The method does not require long sample pre-treatment and presents the lowest limit of detection and limit of quantitation values present in literature. Inter- and intra-day variability, linear dynamic range of the calibration curve, recovery and matrix effect were also determined and investigated. The method was applied to several oil samples of different type and origin. Given its accuracy, precision and rapidity, the method is characterized by an interestingly high throughput, reliability, and sensitivity.

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Rice cultivation requires a large use of pesticides and nutrients to control weeds proliferation and improve production. The water quality of four neighbouring rice fields located in the Lomellina area (Italian Padana plain) was monitored in this study along the cultivation period (before, during and after the period of planting), for two successive agricultural seasons (2015 and 2016). Two paddy fields were traditionally cultivated with wet-seeding and the other ones with dry-seeding.Eighteen sampling points were considered: 8 points for surface water, 2 points for underground water, and 8 points for porous cups with 2 different depth. In order to evaluate the goodness of Revised ManuscriptClick here to access/download;Manuscript;revised manuscript.docx Click here to view linked References the paddy field system to maintain unchanged the quality of the inflow with respect to the outflow water, three of the most used herbicides in Italian rice cultivation (imazamox, oxadiazon and profoxydim) and other physical-chemical parameters were determined, namely biological oxygen demand after 5 days, chemical oxygen demand, total suspended solids, anionic surfactants, total hardness, total amount of phosphorus, nitrogen, and potassium and heavy metal concentrations.In general, all the collected data confirmed that paddy fields did not contribute to worsen the environmental pollution. The different flooding techniques adopted in the fields did not highlight significant differences in concentrations of pesticides or metals. The pesticides reached their maximum concentration (of the magnitude order of few ng mL -1 ) in the day after the administration and in the day after the application in the adjacent field. A slight reduction of total As in grain was obtained adopting a dry period from the steam elongation up to booting. From the collected data, it was possible to identify a general water flow direction in the paddy fields from North-West to South-East: this prevailing flow direction was useful to understand not only the diffusion of the pesticides and of their degradation products in the fields, but also that of the nutrients.As concerns nutrients, it was important not to activate a recirculation of the water in the field during the first 10 days from the administration, in order to avoid loss of nitrogen in the water vents or for percolation. Moreover, the monitoring of potassium concentration allowed to avoid the use of unnecessary potassic fertilization when there was already a high amount of this element in the paddy field deriving from the irrigation. However, all the investigated water quality parameters were under the limits fixed by the European Regulation. In addition, the presence of seven unexpected compounds was identified by non-target approach in both campaigns in samples collected in the early summer period. Four of these emerging contaminants were identified as N,N-diethyl-meta-toluamide, tricyclazole, amidosulfuron and one of the imazamox photodegradation products.Although the low found concentrations of...

This article deals with the photodegradation of sulforhodamine B, a dye widely used in nonpermanent tattoos. Degradation evidence was obtained from both aqueous and sweat-simulating solutions of the dye after 9 days of Solarbox irradiation. The identification of the degradation products was achieved using a nontarget approach. For this purpose, a micro liquid chromatography method coupled with tandem high-resolution mass spectrometry was developed. In addition, the chemical structures of five degradation products and two dye impurities were elucidated. The degradation products were the same for both types of solution, whereas the degradation rate of the dye in sweat-simulating solution was slightly faster than that in aqueous solution. The method was also applied to samples of tattooed pigskin subjected to irradiation, in order to better simulate the irradiation effects on the dye used on the skin. None of the degradation products found in the sulforhodamine B solutions were identified in the degraded tattooed pigskin samples, but a new signal at m/z 637.3051 (positive ionization) was found, and the structure of the corresponding molecule was elucidated. The mutagenicity of the photodegradation products was evaluated using a quantitative structure-activity relationship approach, which gave negative results for all the structures elucidated. Graphical Abstract Comparison between tattoed pigskin before and after photodegration process. Strategies for the identification of sulforhodamine B degradation products.

This paper reports the study of the photodegradation reactions that tricyclazole can naturally undergo, under the action of sunlight, in aqueous solutions of standard tricyclazole and of the commercial BEAM(TM) formulation. The analyses are carried out by ultra-high performance liquid chromatography technique coupled with high-resolution tandem mass spectrometry. Analysis of both tricyclazole and BEAM(TM) water solutions undergone to hydrolysis does not evidence new chromatographic peaks with respect to the not treated solutions. On the contrary, analysis of the same samples subjected to sunlight irradiation shows a decreased intensity of tricyclazole signal and the presence of new chromatographic peaks. Two photodegradation products of tricyclazole have been identified, one of which has been also quantified, being the commercial standard available. The pattern is similar for the solutions of the standard fungicide and of the BEAM(TM) formulation. The results obtained from eco-toxicological tests show that toxicity of tricyclazole standard solutions is greater than that of the irradiated ones, whereas toxicity levels of all the BEAM(TM) solutions investigated (non-irradiated, irradiated, and hydrolyzed) are comparable and lower than those shown by tricyclazole standard solutions. Experiments performed in paddy water solution show that there is no difference in the degradation products formed.