Metal food and drink cans are commonly coated with epoxy films made from phenolic polymers produced bisphenol A (BPA). It is well established that residual BPA monomer migrates into can contents during processing storage. While a number of studies have reported concentrations in foods foreign markets specialty on the U.S. market, very few peer-reviewed data for canned market were available. This study quantified 78 two frozen products using an adaptation previously liquid...

The ambient ionization technique direct analysis in real time (DART) was characterized and evaluated for the screening of food packaging presence additives using a benchtop mass spectrometer (MS). Approximate optimum conditions were determined 13 common food-packaging additives, including plasticizers, anti-oxidants, colorants, grease-proofers, ultraviolet light stabilizers. Method sensitivity linearity solutions polymer samples. Additionally, response model additive...

Concentrations of polybrominated diphenyl ethers (PBDEs), pesticides, polychlorinated biphenyls (PCBs), and polycyclic aromatic hydrocarbons were measured in 136 fish from 14 remote lakes 8 western U.S. National Parks/Preserves between 2003 2005 compared to human wildlife contaminant health thresholds. A sensitive (median detection limit, −18 pg/g wet weight), efficient (61% recovery at ng/g), reproducible (4.1% relative standard deviation (RSD)), accurate (7% reference material (SRM))...

An updated survey of U.S. infant formula was conducted to determine the concentrations bisphenol A (BPA). The purpose accurately assess BPA across market, accounting for lot variability, and if geographic location or can age influences concentrations. method developed measure in utilizing isotope dilution, solid-phase extraction, liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). tested found be reproducible (10% relative standard deviation), reliable (47 +/- 1% recovery),...

ADVERTISEMENT RETURN TO ISSUEPREVFeatureNEXTThe Western Airborne Contaminant Assessment Project (WACAP): An Interdisciplinary Evaluation of the Impacts Contaminants in U.S. National ParksHow much are contaminants impacting wildlife Parks?Dixon H. Landers, Staci Massey Simonich, Daniel Jaffe, Linda Geiser, Donald Campbell, Adam Schwindt, Carl Schreck, Michael Kent, Will Hafner, Howard E. Taylor, Kimberly Hageman, Sascha Usenko, Luke Ackerman, Jill Schrlau, Neil Rose, Tamara Blett, and Marilyn...

Post-plasma ambient desorption/ionization (ADI) sources are fundamentally dependent on surrounding water vapor to produce protonated analyte ions. There two reports of humidity effects ADI spectra. However, it is unclear whether will affect all and analytes, by what mechanism affects Flowing atmospheric pressure afterglow (FAPA) ionization direct analysis in real time (DART) mass spectra various surface-deposited gas-phase analytes were acquired at temperature across a range observed values....

Unstable explosive hexamethylene triperoxide diamine (HMTD) is dangerous in quantity and benefits from the minimal sampling handling associated with atmospheric pressure chemical ionization for mass spectral analysis. Seasonal variation observed HMTD spectra suggested a humidity dependence. Therefore, direct analysis real time (DART) were acquired at range of values. An enclosure was designed to fit around ion source spectrometer inlet pressure. The supplied controlled amounts humidified air...

A GC/low-resolution MS method for the quantitative isotope dilution analysis of 39 mono- to heptabrominated diphenyl ethers was developed. The effects two different ionization sources, electron impact (EI) and capture negative (ECNI), their parameters on production high-mass fragment ions [M − xH yBr]- specific PBDEs were investigated. Electron energy, emission current, source temperature, ECNI system pressure, choice reagent gases optimized. Previously unidentified enhancement PBDE ion...

AbstractDirect analysis in real time coupled to time-of-flight mass spectrometry (DART/TOF-MS) was used detect the non-visible set-off of photoinitiators on food contact surface three different packages. The samples were intentionally under-cured provoke set-off. Twelve commercially available included ink formulations including α-amino-, morpholino, and α-hydroxy benzophenones, thioxanthones, aryl-phosphine oxide polymeric versions these. Major colours packages' prints analysed, as well...

Since the UV ink photoinitiator (PI) isopropylthioxanthone (ITX) was discovered in packaged milk, studies of print contamination have focused primarily on PIs but also included amine synergists. Many other substances are used or formed during process, yet their identity and set-off properties to be catalogued food packaging. Three different techniques: direct analysis real-time high-resolution mass spectrometry (DART-HRMS), gas chromatography-mass (GC-MS) ultra-high-pressure liquid...

Set-off is the unintentional transfer of substances used in printing from external printed surface food packaging to inner, food-contact surface. Ambient ionization-accurate mass spectrometry (AMI-AMS) detected and identified compounds print set-off not visible human eye. AMI spectra inner outer surfaces nonprinted were compared detect identify nonvisible components. A protocol unknowns was developed using a custom open-source database inks food-packaging compounds. The matched print-related...

Any food contact material (FCM) must be approved by the US FDA as being compliant with Title 21 of Code Federal regulations Parts 170–199, and/or obtain a non-objection letter through Food Contact Notification Process, before placed into United States market. In past years, several scientific articles identified FCM or more specifically, (FCAs), which were contaminated brominated flame retardants (BFRs) in European Union. Prior research has suggested source BFR contamination was likely...

Abstract Reproductive disruption is well documented in polluted areas, such as below sewage treatment plants, but not ecologically protected environments, national parks. In a majority of subalpine lakes sampled Rocky Mountain and Glacier National parks, we observed intersex male cutthroat trout Oncorhynchus clarkii brook Salvelinus fontinalis at frequencies 9‐33%. Intersexuality, one form reproductive disruption, the presence both female structures same animal. Male trout, rainbow O. mykiss...

Rationale Polyamide (PA) is the generic name of polymers synthesized by linking monomers via amide bonds, and various types PAs with different monomer compositions are known. Distinguishing PA useful in directing residual testing, product reverse engineering, but analytically challenging cumbersome. To simplify this, we explored applicability direct analysis real time mass spectrometry (DART‐MS) for screening polymers. Methods A DART ion source coupled to a quadrupole Orbitrap...

The combined use of DART-HRMS, XRF and HPLC-MS/MS to determine potential contamination with brominated flame retardants (BFRs) in several food contacts articles (FCAs) purchased Spain was investigated. DART-HRMS were used as screening techniques for BFR identification. DART detected 100 % 80 respectively the contaminated samples. determination TBP (Tribromophenol), TBBPA (Tetrabromobisphenol-A) BDE-209 (Decabromodiphenyl ether). method validated terms correlation coefficient (r2 ≥ 0.994),...

Abstract The enantiomer fractions (EFs) of alpha‐hexachlorocyclohexane ( α ‐HCH), cis‐, trans‐, and oxychlordane, heptachlor epoxide were measured in 73 snow, fish, sediment samples collected from remote lake catchments, over a wide range latitudes, seven western U.S. National Parks/Preserves to investigate their sources, fate, accumulation biotransformation these ecosystems. present study is novel because lakes had no inflow or outflow, the measurement chiral organochlorine pesticides...

During the development of rapid screening methods to detect economic adulteration, spray-dried milk powders prepared by dissolving melamine in liquid exhibited an unexpected loss characteristic features near-infrared (NIR) and Raman spectra. To further characterize this "wet-blending" phenomenon, lactose samples were produced as a simplified model investigated NIR spectroscopy, proton nuclear magnetic resonance (1H NMR), direct analysis real time Fourier transform mass spectrometry...

Two unknown compounds were previously determined to be potential interferences in liquid chromatography/tandem mass spectrometry (LC/MS/MS) analysis of bisphenol A (BPA) canned infant formula. Both yielded two identical MS/MS transitions BPA. The identities the unknowns investigated using accurate LC/MS, LC/MS/MS, and elemental formula structures proposed. Exact confirmed through purification or synthesis followed by 1 H 13 C nuclear magnetic resonance (NMR) experiments, as well comparisons...

In this work, we evaluate two commercially available portable Raman spectrometers for their ability to accurately determine the presence of ortho-phthalate ester plasticizers, hereafter referred as phthalates, in poly(vinyl chloride) (PVC) food contact production line tubing. Further, aim identify individual plasticizer compounds PVC tubing from a panel multiple components with spectroscopy. This is accomplished through library spectral matching unknown samples on-instrument spectra....

Fluorotelomer-based acrylate polymers and surfactants used to grease-proof food contact paper (FCP) are potential sources of dietary exposure perfluoroalkyl substances (PFAS). Food (FCS) containing polyfluorinated long-chains (≥C8) were voluntarily removed by their manufacturers from the U.S. market in 2011 due health concerns largely replaced with FCSs short-chain (≤C7) PFAS. In 2020, FDA findings biopersistence 6:2 FTOH (CF

Received: 12 January 2011 Revised: 25 February Accepted: 26 Rapid Commun Mass Spectrom. 2011, 25, 1336–1342. DOI: 10.1002/rcm.4997 There was an error in the "Abstract" for this article. Lines 7–9 read "Positive ion ESI spectra confirmed both were larger molecules, suggesting that negative mode they likely fragmented to BPA molecular source." These should deprotonated

Four manufacturing impurities of D&C Red No. 33 isolated by counter-current chromatography were analyzed NMR and ESI mass spectrometry. Three these reported previously with minimal details structural determination. All four are structurally related to the main component dye. The fourth exhibited an unusual discrepancy between structure its chemical formula suggested ESI-MS results. Structural determination assignment discussed as well resolution results impurity.