950 research outputs found
D.H. Lawrence, La Volpe, traduzione e cura di Stefania Michelucci, edizione bilingue
No full textIt is the bilingual and critical edition of D.H. Lawrence's The Fox in the series, Elsinore, Collana di Classici Inglesi, edited and translated by Stefania Michelucci
The volume consists of a long introduction to the text, pp 11-37, of a biographical article on the author and his work (l'autore e l'opera), pp. 39-45), of a note to the text (pp. 47-48) (English and Italian, page to page, pp. 49-227) of explicatory notes (pp. 229-243) and of a biographical section (pp. 245-252)
SPE-HPLC-DAD Dosage of Seven Neonicotinoids in Green Coffee
No full textGreen coffee is essential in many tropical economies. Its cultivation often necessitates using pesticides that can leave behind residues harmful to human health. To ensure consumer safety, the European Community has set strict maximum residue limits (ranging from 0.01 to 1.0 mg/kg) for pesticides in green coffee sold within Europe. However, the lack of official testing methods for neonicotinoids (NEOs) is a problem, as laboratories must spend resources and time developing and validating suitable analytical methods. This study developed and validated a method for the simultaneous analysis of seven NEOs frequently used in coffee cultivation: acetamiprid, clothianidin, dinotefuran, imidacloprid, nitenpyram, thiacloprid, and thiamethoxam. The proposed methodology uses Strata®-X PRO cartridges (solid-phase extraction) to remove interfering compounds present in the food matrix and high-performance liquid chromatography (HPLC), equipped with a diode array detector (DAD), to determine NEOs. The accuracy profile strategy validated the method’s suitability for the intended application. NEO recovery rates above 97%; negligible matrix effects (>93%); the linearity of the quantification method (R2 values above 0.99); relative biases and standard deviations below 5% and 6%, respectively; and an expected error rate less than 8% allowed to consider the method reliable for the intended objectives. Because of its low ecological impact and simple execution, this method can be used in routine analyses
Development and validation of a solid-phase extraction method coupled to high-performance liquid chromatography with ultraviolet-diode array detection for the determination of sulfonylurea herbicide residues in bovine milk samples
No full textThis study proposes a fast, simple and sensitive liquid chromatography diode array detector (LC/UV-DAD)-based method for the simultaneous determination of eight sulfonylurea herbicides (bensulfuron methyl, chlorsulfuron, metsulfuron methyl, primisulfuron methyl, rimsulfuron, thifensulfuron methyl, triasulfuron and tribenuron methyl) in bovine whole milk at concentrations lower than the default limit of 0.01 mg kg(-1) allowed by current legislation (Regulation EC/396/2005 and following Annexes). An effective one-step solid phase extraction (SPE) and clean up procedure was defined with use of Chem Elut cartridges, providing good recoveries for all the analytes tested and with no matrix effects affecting method accuracy. Separation of herbicides was obtained on a C(18) column by acetonitrile- water gradient elution. Method validation has been performed according to European Commission Decision 2002/657/EC criteria, in terms of linearity, recovery, precision, specificity, decision limit (CC(α)) and detection capability (CC(β)). Typical recoveries ranged between 78.4% and 99.7%, at the maximum residue limits (MRLs) levels established by Regulation EC/396/2005, with relative standard deviations (RSD) no larger than 10%
A Simple and Selective Analytical Procedure for the Extraction and Quantification of Lutein from Tomato By-Products by HPLC-DAD
No full textLutein, a yellow dihydroxylated carotenoid, is
present in many dietary supplements due to its biological
properties. Currently, lutein is extracted from marigold
flowers by expensive and time-consuming processes. Since
tomatoes contain significant levels of lutein, in this study we
have examined the feasibility of using tomato by-products as
an alternative, low-cost source of this carotenoid. The
determination of this carotenoid was performed by highperformance
liquid chromatography???diode array detection,
after selective extraction from tomato waste product
samples. Lutein levels ranged from 9.9 to 10.5 ??g/g dry
weight. Tomato waste products may be indicated as an
alternative commercial source of lutein for food fortification
and/or dietary supplements
Chemistry of Verongida Sponges- I. Constituents of the Caribbean Sponge Pseudoceratina crassa
No full textStudy on bisphenol F, a bisphenol A analogue, at a dairy company: Health hazard and risk assessment
No full textThe occurrence of analogues of bisphenol A (BPA), including bisphenol F(BPF) in milk is still not well known. BPF may enter the milk chain at the farm and during milk processing at the dairy company. This study identified the main BPF contamination pathways using a monitoring model based on the identification of the hazard at three stages along the dairy chain: raw milk from the storage tank, pasteurized milk from the storage tank, and cardboard packaged milk. Quantitative analysis was performed by high-performance liquid chromatography with fluorometric detection (HPLC/FD) system. BPF was detected in all analysed stages (fro
Bisphenols and Alkylphenols in Food: From Farm to Table
No full textAbstract: Background: Bisphenols and alkylphenols are industrial chemicals widely used in the manufacture
of plastics. In addition, alkylphenols are commonly used as intermediates to produce surfactant.
In the last few years, concerns about the use of these substances have increased due to their negative
effects as Endocrine Disruptors. Humans may be exposed to bisphenols and alkylphenols through several
sources but foods are believed to be the main exposure route.
Methods: An overview of the literature concerning the analysis of the bisphenol and alkylphenol levels
in foods has been reviewed. We focused on the most recent literature (2010-2016) and only articles,
reporting analyses on more than ten samples were considered.
Results: Concentration levels of alkylphenols in foodstuffs, reported in the literature, suggest diet to be
an important route of human exposure to these contaminants.
BPA is still the most detected bisphenol in food matrices. It is ubiquitous in foodstuffs prevailing in
canned foods that continue to be the main route of exposure to bisphenols for humans. However, its
levels are always below the current migration limits.
Conclusion: Data concerning the levels of multiple bisphenols in foods are still poor as well as toxicological
studies on the potential effects of the bisphenol mixtures. Based on the foregoing, further studies
should be carried out in order to collect scientific findings to help governments, policy makers, and food
safety authorities to amend the current legislation on bisphenols
Development and validation of a solid-phase extraction method coupled to high-performance liquid chromatography with ultraviolet-diode array detection for the determination of sulfonylurea herbicide residues in bovine milk samples
No full textThis study proposes a fast, simple and sensitive liquid chromatography diode array detector (LC/UV-DAD)-based method for the simultaneous determination of eight sulfonylurea herbicides (bensulfuron methyl, chlorsulfuron, metsulfuron methyl, primisulfuron methyl, rimsulfuron, thifensulfuron methyl, triasulfuron and tribenuron methyl) in bovine whole milk at concentrations lower than the default limit of 0.01mgkg-1 allowed by current legislation (Regulation EC/396/2005 and following Annexes). An effective one-step solid phase extraction (SPE) and clean up procedure was defined with use of Chem Elut cartridges, providing good recoveries for all the analytes tested and with no matrix effects affecting method accuracy. Separation of herbicides was obtained on a C18 column by acetonitrile- water gradient elution. Method validation has been performed according to European Commission Decision 2002/657/EC criteria, in terms of linearity, recovery, precision, specificity, decision limit (CC??) and detection capability (CC??). Typical recoveries ranged between 78.4% and 99.7%, at the maximum residue limits (MRLs) levels established by Regulation EC/396/2005, with relative standard deviations (RSD) no larger than 10%
Aptamer-Based Biosensors for the Analytical Determination of Bisphenol A in Foodstuffs
No full textBisphenol A (BPA) is a synthetic compound utilized to manufacture plastics for Food Contact Materials (FCMs) or resins for the inside of food containers. Since it was recognized as an Endocrine-Disrupting Chemical (EDC), its implications in pathologies, such as cancer, obesity, diabetes, immune system alterations, and developmental and mental disorders, have been widely documented. Diet is considered the main source of exposure for humans to BPA. Consequently, continuous monitoring of the levels of BPA in foods is necessary to assess the risk associated with its consumption in one’s diet. So far, many reviews have been published on biosensors and aptamer-based biosensors, but none of them focus on their applications in their analyses of bisphenols in food matrices. With this review, the authors aim to fill this gap and to take a snapshot of the current state-of-the-art research on aptasensors designed to detect BPA in food matrices. Given that a new TDI value has recently been proposed by the EFSA (0.04 ng/kg), the search for new sensitive tools for the quantitative analysis of BPA is more topical and urgent than ever. From this perspective, aptasensors prove to be a good alternative to traditional analytical techniques for determining BPA levels in food
Endocrine Disruptors: Hidden killers in our food. A mini review on some Italian products
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