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PubMed Journal Database | Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment RSS

12:10 EDT 24th April 2014 | BioPortfolio

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Showing PubMed Articles 1–25 of 161 from Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment


Risk Control and Food Safety: Proceedings of the 11th UJNR International Symposium on Toxic Microorganisms, March 4-9, 2012, Tokyo, Japan.


Comparison of four different methods for the determination of sulfites in foods marketed in South Korea.

Sulfites in foods were analysed using four methods: optimised Monier-Williams (official method), modified Rankine, HPLC and ion-exchange chromatography (IEC). The modified Rankine and HPLC methods were performed according to the previously reported methods but with some modifications. The IEC method was carried out through a combination of a modified Rankine apparatus and an anion-exchange column for the first time. In false-positive response tests, false-positive results with acetic acid and propionic acid...


Sesamin and sesamolin as unexpected contaminants in various cold-pressed plant oils: NP-HPLC/FLD/DAD and RP-UPLC-ESI/MS(n) study.

Thirteen cold-pressed oils (Japanese quince seed, black caraway, flaxseed, rapeseed, hemp, peanut, sunflower, pumpkin, hazelnut, poppy, walnut, almond, and sesame oil) manufactured by the same company, in a two-year period (2011-2012) were assessed for lipophilic compounds. The presence of sesamin and sesamolin, two characteristic lignans of sesame oil, were detected in all tested plant oils. Both lignans were identified by NP-HPLC/FLD/DAD and confirmed by a RP-UPLC-ESI/MS(n) method. The lowest amount of se...


Determination of polycyclic aromatic hydrocarbons in Italian milk by HPLC with fluorescence detection.

The presence of polycyclic aromatic hydrocarbons (PAHs) in Italian commercial milk samples is reported. The study was carried out on lactating (cow and goat) and plant (rice, soya, oat) milk. The quantitative determination involved liquid-liquid extraction of PAHs, a pre-concentration and determination by HPLC using a fluorescence detector. The recovery of analytes was in the range of 70-115%. The precision of the method was found to be between 6% and 24%. The detection limit ranged from 0.66 to 33.3 µg/L...


Identification of novel metabolites from Aspergillus flavus by high resolution and multiple stage mass spectrometry.

The filamentous fungus Aspergillus flavus is one of the most important species in the Aspergillus genus and is distributed worldwide as a prevalent aflatoxin-producing food and feed contaminant. A. flavus contains more than 55 gene clusters that are predicted to encode proteins involved in secondary metabolite production. One of these, cluster 27, contains a polyketide synthase (pks27) gene that encodes a protein that is highly homologous to the aflatoxin cluster PKS. Comparative metabolomics, using ultra-h...


Development of an active wheat gluten film with L. curvatus CRL705 bacteriocins and a study of its antimicrobial performance during aging.

Antimicrobial wheat gluten film was obtained at pilot scale by Lactobacillus curvatus CRL705 bacteriocins inclusion in the film forming solution. Bacteriocins minimum inhibitory concentration for the film activation was 2133 AU cm(-3) (lactocin AL705) and 267 AU cm(-3) (lactocin 705). Mechanical and barrier properties as well as film aging kinectics were not significantly affected by bacteriocins addition. The antimicrobial film performance during aging was assessed. Film activity against Listeria innocua 7...


Estimates of dietary exposure to bisphenol A (BPA) from light metal packaging, using food consumption and packaging usage data: a refined deterministic approach and a fully probabilistic (FACET) approach.

Abstract The FACET tool is a probabilistic model to estimate exposure to chemicals in foodstuffs, originating from flavours, additives and food contact materials. This paper demonstrates the use of the FACET tool to estimate exposure to BPA (bisphenol A) from light metal packaging. For exposure to migrants from food packaging, FACET uses industry supplied data on the occurrence of substances in the packaging, their concentrations and construction of the packaging, which were combined with data from a market...


Dioxin and dl-PCB exposure from food: the German LExUKon project.

Abstract Polychlorinated dibenzo-p-dioxin and -furan (PCDD/F) and dioxin-like polychlorinated biphenyls (dl-PCB) exposure from food were estimated using new food consumption data from the recent German food consumption survey (Nationale Verzehrsstudie II, NVS II). Based on these comprehensive data, information on consumption of 545 individual food items by the German population was derived. Concentrations of dioxin-like compounds in food were compiled from the German food monitoring programme (GFMP), the Ge...


Sex steroid levels in urine of cattle of different ages - evaluation of abuse control procedures.

Levels of several natural urinary steroids have been determined in the urine of a large number of animals of different cattle categories in the context of steroid abuse in beef production. Bovine animals of different breeds, sex and age, included in the Slovene national residue detection plan for steroid abuse, were studied. Urine from 120 males and 174 females was analysed. Urinary boldenone, boldione, androstenedione, equiline, medroxyprogesterone, medroxyprogesterone acetate, melengestrol acetate, proges...


Improvement of sample preparation procedure for multi-elemental determination in Brazil nuts by ICP-OES.

Abstract Various sample preparation procedures, such as common wet digestions and alternatives based on solubilisation in aqua regia or tetramethyl ammonium hydroxide were compared for the determination of the total Ba, Ca, Cr, Cd, Cu, Fe, Mg, Mn, Ni, P, Pb, Se, Sr and Zn contents in Brazil nuts using inductively coupled plasma optical emission spectrometry (ICP-OES). For measurement of Se, hydride generation technique was used. The performance of these procedures was measured in terms of precision, accurac...


Trends in the use of natural antioxidants in active food packaging: a review.

The demand for natural antioxidant active packaging is increasing due to their unquestionable advantages compared with the addition of antioxidants directly to the food. Therefore, the search for antioxidants perceived as natural, namely those that naturally occur in herbs and spices, is a field that is attracting great interest. In line with this, in the last few years, natural antioxidants such as α-tocopherol, caffeic acid, catechin, quercetin, carvacrol and plant extracts (e.g. rosemary extract) have b...


Investigation of the transfer of difenoconazole and azoxystrobin residues from chrysanthemum flower tea to its infusion.

Abstract Investigations of the transfer of pesticide residues from tea to its infusion can be important in the assessment of the possible health benefits in tea consumption. In this work, the transfer behavior of difenoconazole and azoxystrobin residues from chrysanthemum tea to its infusion was investigated by GC with electron capture detection at different water temperatures, infusion intervals and times. The transfer percentages were in the range of 18.7-51.6% for difenoconazole and 38.1-71.2% for azoxys...


Multi-analyte methods for the detection of photoinitiators and amine synergists in food contact materials and foodstuffs - Part One: HPLC-DAD screening of materials.

The objective of this work was to develop a HPLC-DAD method suitable for the screening of food contact materials for a total of 63 monomeric and polymeric photoinitiators and amine synergists. Such multi-analyte methods are worthwhile for official control laboratories, where normally no information about the composition of the applied inks or varnishes on the printed or lacquered materials is available and thus target analyses are not feasible. The polymeric analytes were each separated in a multitude of su...


Anatomical mercury speciation in bay scallops by thio-bearing chelating resin concentration and GC-electron capture detector determination.

The highly toxic methyl-, ethyl- and phenylmercury species that may exist in the three main anatomical parts - the adductor muscle, the mantle and the visceral mass - of bay scallops (Argopecten irradias) were quantitatively released by cupric chloride, zinc acetate, sodium chloride and hydrochloric acid (HCl) under ultrasonic extraction. After centrifugation, the mercury species in the supernatant were concentrated by thio (SH)-bearing chelating resins, eluted with HClO4 and HCl and extracted with toluene....


Tissue deposition and residue depletion of melamine in fattening pigs following oral administration.

The adulteration of animal feed as well as milk products with melamine has led to concerns about the ability to establish appropriate withdrawal intervals to ensure food safety. Two experiments were conducted in this study. The first was to investigate the deposition and depletion of melamine in blood and tissues of pigs exposed to adulterated feed with high doses of melamine. A total of 500 or 1000 mg kg(-1) melamine was added to the diet for fattening pigs (initial BW = ±60.24 kg). Melamine residues...


Simultaneous determination of sorbic and benzoic acids in milk products using an optimised microextraction technique followed by gas chromatography.

A rapid and reliable method for direct determination of sorbic and benzoic acids in milk products was developed by dispersive liquid-liquid microextraction (DLLME) and gas chromatography with flame ionisation detector (GC-FID). A response surface methodology (RSM) based on a central composite design (CCD) was applied for optimisation of the main variables, such as volume of extraction and dispersive solvents, pH and salt effect. The primary extraction of sorbic and benzoic acids were performed in 8 mL NaOH...


Sustainable (food) packaging - an overview.

Packaging has an increasingly essential role to play in preserving the value invested in products by ensuring that they can deliver their designed service with minimum wastage. Food contact materials that deliver more units of service with increasingly fewer inputs of energy and materials, and increasingly fewer negative social, economic and environmental impacts, e.g., from emission of wastes, will be more sustainable both in the food processing machines of the industrial system and as packaging for food....


Contamination of food samples from Malaysia with polychlorinated dibenzo-p-dioxins and dibenzofurans and estimation of human intake.

Abstract A total of 126 food samples, categorized into three groups (seafood and seafood products, meat and meat products as well as milk and dairy products) from Malaysia were analyzed for polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs). The concentration of PCDD/Fs ranged from 0.16 to 0.25 pg WHO05-TEQ g(-1) fw was found in these samples. According to the food consumption data from Global Environment Monitoring System (GEMS) by World Health Organization (WHO), the diet...


Study of silver ion migration from melt blended and layered deposited silver polyethylene nanocomposite into food simulants and apple juice.

Colloidal silver nanoparticles were prepared via chemical reduction by using polyethylene glycol (PEG) as a reducing agent, stabilizer, and solvent. Silver polyethylene nanocomposites were produced via two methods, namely, melt blending and layer-by-layer (LBL) deposition of silver nanoparticles onto a polyethylene film. The silver ion release from either melt blended or LBL deposited nanocomposites into a food simulant and apple juice during 30 days at 4°C and 40°C was determined by atomic absorption sp...


Investigation of the presence of prednisolone in bovine urine.

Abstract Over the past 2 years low levels of prednisolone have been reported in bovine urine by a number of laboratories in EU member states. Concentrations vary, but are reported to be below approximately 3 g/l. In 40% of bovine urine samples from the Dutch national control plan had concentrations of prednisolone between 0.112.04 g/l. In this study the mechanism of formation of prednisolone was investigated. In-vitro conversion of cortisol by bacteria from faeces and soil, bovine liver enzymes and stabi...


Updated evaluation of the migration of styrene monomer and oligomers from polystyrene food-contact materials to foods and food simulants.

Abstract Due to the 2011 labeling of styrene monomer as "reasonably anticipated to be a human carcinogen" by the National Institutes of Health's National Toxicology Program (NTP) and the controversy over whether styrene oligomers mimic the physiological effects of estrogen, an updated review of styrene monomer and oligomers in food and food contact materials (FCMs) was performed. The concentrations of styrene monomer and oligomers were determined in 24 polystyrene (PS) products and ranged from 9.3 to 3100 ...


Isolation and identification of novel propoxyphenyl thiosildenafil found in natural health food product.

A novel phosphodiesterase-5 (PDE-5) inhibitor was found in a natural health food product. The previously unknown sildenafil analogue was isolated using preparative HPLC. The structure of the compound was elucidated using HPLC with diode array detection (DAD), time-of-flight mass spectrometry (TOF/MS), and nuclear magnetic resonance spectroscopy (NMR). An [M + H](+) ion was detected at m/z 505.2077 by LC-TOF/MS that was consistent with C23H32N6O3S2 (-0.98 ppm). By NMR analysis, the analogue was identified...


Simultaneous determination of 36 pesticide residues in spinach and cauliflower by LC-MS/MS using multi-walled carbon nanotubes-based dispersive solid-phase clean-up.

A multi-residue method based on a modified QuEChERS sample preparation with multi-walled carbon nanotubes (MWCNTs) as reversed-dispersive solid-phase extraction (r-DSPE) material and LC-MS/MS determination by MRM mode was validated for 36 representative pesticides in spinach and cauliflower. It was demonstrated that MWCNTs can be used as effective r-DSPE materials with the QuEChERS method for the clean-up of extract from different matrices. However, MWCNTs could absorb pyrimethanil, diflubenzuron, and chlor...


Simultaneous determination of selected biogenic amines in alcoholic beverage samples by isotachophoretic and chromatographic methods.

A simple and useful method for the determination of biogenic amines in beverage samples based on isotachophoretic separation is described. The proposed procedure permitted simultaneous analysis of histamine, tyramine, cadaverine, putrescine, tryptamine, 2-phenylethylamine, spermine and spermidine. The data presented demonstrate the utility, simplicity, flexibility, sensitivity and environmentally friendly character of the proposed method. The precision of the method expressed as coefficient of variations va...


Analyses by UPLC Q-TOF MS of products of aflatoxin B1 after ozone treatment.

Analysing the products of ozone-treated aflatoxin B1 (AFB1) is essential in order to study the practical use of ozone treatment. In this paper, the products of AFB1 were investigated using ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC Q-TOF MS). The products were well separated using UPLC, and the accurate masses of all the products were determined using Q-TOF MS. Finally, the possible pathways of fragmentation ion generation from the products of AFB1 and the stru...

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