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

06:52 EDT 31st August 2015 | BioPortfolio

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Showing PubMed Articles 1–25 of 274 from Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment

1323711

Simultaneous quantitative determination, identification, and qualitative screening of pesticides in fruits and vegetables using LC-Q-Orbitrap™-MS.

A method based on QuEChERS extraction and LC-quadrupole-Orbitrap MS detection was established utilising an improved fully non-targeted way of data acquisition with and without fragmentation. A full scan acquisition event without fragmentation (resolving power 70,000) was followed by five consecutive fragmentation events (variable data independent acquisition, vDIA; resolving power 35,000) where all ions from the full scan range are fragmented. Compared to fragmentation in a single event (all-ion-fragmentati...

1322923

Protective activity of probiotic bacteria against 2-amino-3-methyl-3H-imidazo4,5-fquinoline (IQ) and 2-amino-1-methyl-6-phenyl-1H-imidazo4,5-bpyridine (PhIP) - an in vitro study.

Heterocyclic aromatic amines (HAAs) are carcinogenic compounds present in a typical Western diet rich in thermally processed meat. These nutritional factors can modulate the cytotoxicity of fecal water (FW) and induce tumours in the human gastrointestinal tract. Supplementation with probiotics is promising in terms of reducing the harmful effects of HAAs in the human body. The aim of the study was in vitro assessment of the protective activity of the probiotic strains Lb. rhamnosus 0900, Lb. rhamnosus 0908,...

Sunday 11th May 1320

The effect of increased intake of fish and mussels on exposure to toxic trace elements in a healthy, middle-aged population.

Fish and shellfish are rich in essential nutrients, but are also a source of exposure to environmental contaminants. We aimed to investigate the effect of increased fish and mussel intake on mercury, arsenic, lead, and cadmium blood concentrations. We randomly assigned 102 healthy men and women (all non-smokers) aged 48-76 years to an intervention group (n = 51) or a control group (n = 51). Intervention participants received a high amount of fish and mussels for 26 weeks (1 kg/week). Controls received...

Saturday 12th January 1320

Determination and surveillance of hydrocortisone and progesterone in livestock products by liquid chromatography-tandem mass spectrometry.

A simple analytical method for the determination of hydrocortisone and progesterone in bovine, swine and chicken muscle and eggs was developed. Hydrocortisone and progesterone were extracted with acetonitrile and subsequently cleaned up using an Oasis(®) HLB mini-cartridge. The method was validated in accordance with Japanese guidelines, and exhibited trueness from 86.6% to 104.3% and precision (relative standard deviations (RSDs) of repeatability and within reproducibility were under 8.7% and 11.7%, respe...

1312934

Identification of novel peptides for horse meat speciation in highly processed foodstuffs.

There is a need for robust analytical methods to support enforcement of food labelling legislation. Proteomics is emerging as a complementary methodology to existing tools such as DNA and antibody based techniques. Here we describe the development of a proteomics strategy for the determination of meat species in highly processed foods. A database of specific peptides for nine relevant animal species has been used to enable semi-targeted species determination. This principle has been tested for horse meat sp...

1312831

Development of a LC-MS/MS method for studying migration characteristics of acetaldehyde in polyethylene terephthalate packed mineral water.

During storage, acetaldehyde migration from polyethylene terephthalate (PET) bottles can affect the quality of mineral water even in the low µg L(-1) range negatively, as it features a fruity or plastic-like off-flavour. For a sensitive and fast analysis of acetaldehyde in mineral water, a new analysis method by the use of 2,4-dinitrophenylhydrazine (DNPH) derivatisation followed by HPLC-electrospray tandem mass spectrometry (ESI-MS/MS) was developed. Acetaldehyde was directly derivatised in the mineral wa...

1307815

Assessment of meat authenticity using bioinformatics, targeted peptide biomarkers and high-resolution mass spectrometry.

In recent years a significant increase of food fraud has been observed, ranging from false label claims to the use of additives and fillers to increase profitability. Recently in 2013 horse and pig DNAs were detected in beef products sold from several retailers. Mass spectrometry (MS) has become the workhorse in protein research, and the detection of marker proteins could serve for both animal species and tissue authentication. Meat species authenticity is performed in this paper using a well-defined proteo...

1305449

Determination of N-nitrosamines in processed meats by liquid extraction combined with gas chromatography-methanol chemical ionisation/mass spectrometry.

A simple, accessible and reproducible method was developed and validated as an alternative for the determination of nine volatile N-nitrosamines (NAs) in meat products, using a low volume of organic solvent and without requiring specific apparatus, offering the possibility of practical implementation in routine laboratories. The NAs were extracted with dichloromethane followed by a clean-up with phosphate buffer solution (pH 7.0). The extracts were analysed by gas chromatography-chemical ionisation/mass spe...

1301919

Development of a quantitative GC-FID method for the determination of sucrose mono- and diesters in foods.

Sucrose esters (E 473) are emulsifiers used in foods to improve different technological properties. They should be conform to the specifications laid down in Commission Regulation 231/2012 and should be used at amounts not exceeding the maximal ones set by the Commission Regulation 1129/2011. In order to be able to characterise commercial sucrose esters formulations and to evaluate whether they are used correctly by the food industry, a quantitative GC-FID method was developed. Standards of monoesters and d...

1300573

Lab-on-a-chip-based PCR-RFLP assay for the confirmed detection of short-length feline DNA in food.

Wider availability but lack of legal market trades has given feline meat a high potential for use as an adulterant in common meat and meat products. However, mixing of feline meat or its derivatives in food is a sensitive issue, since it is a taboo in most countries and prohibited in certain religions such as Islam and Judaism. Cat meat also has potential for contamination with of SARS, anthrax and hepatitis and its consumption might lead to an allergic reaction. Here we developed a very short-amplicon-leng...

1300460

Migration of selected hydrocarbon contaminants into dry semolina and egg pasta packed in direct contact with virgin paperboard and polypropylene film.

Migration of mineral oil saturated hydrocarbons (MOSH), polyolefin oligomeric saturated hydrocarbons (POSH), and polyalphaolefins (PAO from hot melts) into dry semolina and egg pasta packed in direct contact with virgin paperboard or polypropylene (PP) flexible film, was studied. Migration was monitored during shelf life (up to 24 months), through storage in a real supermarket (packs kept on shelves), conditions preventing exchange with the surrounding environment (packs wrapped in aluminium foil), and sto...

Monday 5th December 1300

Effect of antioxidants and light stabilizers on silver migration from nanosilver-polyethylene composite packaging films into food simulants.

The effect of exposure time, temperature, food simulants, especially additives on the release of silver from nanosilver-polyethylene composite films to food simulants has been studied. Two different type of nanosliver-polyethylene composite films (with or without additives) were chosen to conduct the experiment with the aim of exploring the behavior of silver migration. It was shown that the migration of silver into 50% ethanol at 40℃ and 70℃ was much less than that into 3% acetic acid. With the increas...

1289632

Modelling consumer intakes of vegetable oils and fats.

Vegetable oils and fats make up a significant part of the energy intake in typical European diets. However, their use as ingredients in a diverse range of different foods means that their consumption is often hidden, especially when oils and fats are used for cooking. As a result, there are no reliable estimates of the consumption of different vegetable oils and fats in the diet of European consumers for use in for example, nutritional assessments or chemical risk assessments. We have developed an innovativ...

Monday 3rd April 1284

Modified halloysite nanotubes and the alleviation of kidney damage induced by dietary zearalenone in swine.

The aims of this study were, first, to investigate the toxicity of zearalenone (ZEN) through the analysis of biochemical parameters, oxidative stress, pathological changes and inflammatory response in the kidney of gestation sows and offspring; and, second, to evaluate the efficacy of modified halloysite nanotubes (MHNTs) for the alleviation to the adverse effects induced by ZEN. This study focused on the period of organogenesis between days 35 and 70 of gestation, and treatments included (1) a control diet...

1283951

Semicarbazide may be generated from natural azine development in foods, followed by reaction with urea compounds.

This paper proposes a mechanism to explain the trace levels of natural semicarbazide occasionally observed in foods. The analytical derivative of semicarbazide, 2-nitrobenzaldehyde semicarbazone, is often measured as a metabolite marker to detect the widely banned antibiotic nitrofurazone. However, this marker is not specific as semicarbazide may be present in foods for several reasons other than exposure to nitrofurazone. In some cases, an entirely natural origin of semicarbazide is suspected although up u...

1283835

Simplified multi-element analysis of ground and instant coffees by ICP OES and FAAS.

A simplified alternative to the wet digestion sample preparation procedure for roasted ground and instant coffees has been developed and validated for the determination of different elements by inductively coupled plasma optical emission spectrometry (Al, Ba, Cd, Co, Cr, Cu, Mn, Ni, Pb, Sr, Zn) and flame atomic absorption spectrometry (Ca, Fe, K, Mg, Na). The proposed procedure, i.e., the ultrasound-assisted solubilisation in aqua regia, is quite fast and simple, requires minimal use of reagents and demonst...

Monday 22nd December 1281

High-throughput determination of citrinin in rice by ultra-high-performance liquid chromatography and fluorescence detection (UHPLC-FL).

A rapid, simple and effective method for the determination of citrinin in rice by UHPLC coupled to fluorescence detection has been developed and validated. Extraction of citrinin from rice samples was achieved by applying a QuEChERS-based extraction/partitioning process with water and acetonitrile, without the need of further extract clean-up. The method was fully validated for white rice, and its applicability in other rice matrices, such as brown and red rice, was confirmed by recovery experiments. Under ...

Monday 20th October 1281

Multi-residue analysis of pesticides in traditional Chinese medicines using gas chromatography - negative chemical ionization tandem mass spectrometry.

In this study, a residue analysis method for the simultaneous determination of 107 pesticides in traditional Chinese medicines (TCMs), Angelica sinensis, Angelica dahurica, Leonurus heterophyllus Sweet, Pogostemon cablin, and Lonicera japonica Thunb, was developed using gas chromatography coupled with tandem mass spectrometry in negative chemical ionisation mode (GC-NCI-MS/MS). NCI has advantages of high sensitivity and selectivity to chemicals with electron-withdrawing groups, and yields low background int...

Sunday 5th December 1266

Detection by coupled LC-photodiode array detection and high-resolution Orbitrap MS of dimethyl and diethyl yellow dyes used illegally in processed soymilk curd.

An efficient non-target dye-screening system consisting of a liquid chromatography photodiode array coupled with a high-resolution mass spectrometer (HRMS) is described. Visible absorption spectroscopy assisted in locating the peak of an unknown dye in HRMS chromatograms which allowed the accurate molecular weight of the unknown to be obtained. In a study of the adulteration of processed soymilk curd (tofu) with dimethyl yellow, an unexpected unknown dye was discovered. The compound was further purified by ...

Monday 11th January 1266

Concentrations of dioxins and dioxin-like PCBs in feed materials in the Netherlands in the period 2001-2011.

This study aimed to obtain insights into contamination of feed materials used in the Netherlands with dioxins (polychlorinated dibenzo-p-dioxins and dibenzofurans) and dioxin-like PCBs (polychlorinated biphenyls). Monitoring results from the period 2001-2011, covering in total 4938 samples, were statistically analysed and evaluated against the statutory limits set at the beginning or during this period. The percentage of samples exceeding maximum levels set within the EU for either dioxins or the sum of dio...

1261570

Assessment of mercury and cadmium via seafood consumption in Italy: estimated dietary intake (EWI) and target hazard quotient (THQ).

Hg and Cd were quantified in fish, cephalopods and crustaceans from Italian supermarkets. Sample compliance with European dietary standards as well as human health risks according to Provisional Tolerable Weekly Intake and the methodology of Target Hazard Quotient were evaluated. Both element levels were under European legal limits, except for some fish having Hg and Cd contents exceeding or equal to critical values. Estimated weekly intakes (Hg: fish = 0.07-1.44 µg kg(-1) bw/week; cephalopods = 0.05...

1261450

Migration of Tinuvin P and Irganox 3114 into milk and the corresponding authorised food simulant.

Migration of Tinuvin P (UV stabilizer) and Irganox 3114 (antioxidant) from high-density polyethylene (HDPE) was studied. HDPE pieces were soaked in either milk (1.5% or 3.5% fat content) or 50% (v/v) ethanol - water mixture - the food simulant for milk as specified in regulation 10/2011/EC. The obtained extracts were analysed by LC-MS/MS. For statistical assessment variography was used. It proved to be a useful tool for making a distinction between the early migration range and the equilibrium despite the v...

1260687

Future perspectives in Orbitrap™ high resolution mass spectrometry in food analysis - a review.

We have conducted a literature search from 2007-2014 to identify publications where principally LC-Orbitrap™ high resolution mass spectrometry (HRMS) has been employed in food analysis. Of a total of 212 relevant references, only 22 papers were from the years 2007-2010, but in subsequent years there has been a steady growth in publications with 38 to 55 relevant papers being published each year from 2011-2014. In the food safety area over 50% of the published papers were equally divided between pesticides...

1254671

The influence of interactions between tea (Camellia sinensis) extracts and ascorbic acid on their antioxidant activity. Analysis with interaction indexes and isobolograms.

Products containing natural additives, including antioxidants, are usually perceived by the consumers as safer than those with synthetic ones. Natural antioxidants, besides preservative activity, may exert beneficial health effects. Interactions between antioxidants may significantly change their antioxidant activity, thus in designing functional foods or food/cosmetic ingredients, knowledge on the type of interactions could be useful. In the present study, the interactions between ascorbic acid (AA; vitami...

Tuesday 29th April 1253

Authentication of yerba mate according to the country of origin by using Fourier transform infrared associated with chemometrics.

This study deals with the development of a method for classification of yerba mate (Ilex paraguariensis) using attenuated total reflectance-Fourier transform infrared (ATR-FTIR) and multivariate analysis. Fifty four brands of yerba mate from Southern South America were analysed in order to classify the commercialized yerba mate according to the respective country of yerba mate processing. The yerba mate was ground in cryogenic mill and the reflectance was directly measured in the region ranging from 4,000 t...



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