keyword
MENU ▼
Read by QxMD icon Read
search

Paraben

keyword
https://www.readbyqxmd.com/read/27917496/time-trends-of-contact-allergy-to-the-european-baseline-series-in-lithuania
#1
Kotryna Linauskienė, Laura Malinauskienė, Audra Blažienė
BACKGROUND: Monitoring trends of positive patch test reactions is useful for epidemiological surveillance and contact allergy prevention, and has not previously been reported in Lithuania. OBJECTIVES: To examine and compare changes in the prevalence of contact allergy to European baseline series allergens in adults with suspected contact dermatitis during a 9-year period. METHODS: In this retrospective study, patch test results of 297 consecutive patients, tested with the European baseline series in 2014-2015, were analysed and compared with the data published earlier in Lithuania...
December 4, 2016: Contact Dermatitis
https://www.readbyqxmd.com/read/27914867/new-hbm-values-for-emerging-substances-inventory-of-reference-and-hbm-values-in-force-and-working-principles-of-the-german-human-biomonitoring-commission
#2
REVIEW
Petra Apel, Jürgen Angerer, Michael Wilhelm, Marike Kolossa-Gehring
The German Human Biomonitoring Commission (HBM Commission) derives health-related guidance values (Human Biomonitoring assessment values, HBM values) according to the procedures described in the HBM Commission's position papers. Since the last adaption of the methodology in 2014, the HBM Commission has established a series of new HBM values, mainly on the basis of internationally agreed TDI/RfD values, or of toxicologically well- founded points of departure observed in animal studies. The derivation of these new HBM values for HBCDD, triclosan, 2-MBT, PFOA and PFOS as well as for the metabolites of glycol ethers, of Hexamoll(®) DINCH(®), DPHP, DEHTP, NMP, NEP, and 4-MBC is specified, and the HBM values are presented together with already established HBM values for other substances...
September 17, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/27910986/catalytic-photodegradation-of-pharmaceuticals-homogeneous-and-heterogeneous-photocatalysis
#3
S Klementova, D Kahoun, L Doubkova, K Frejlachova, M Dusakova, M Zlamal
Photocatalytic degradation of pharmaceuticals (hydrocortisone, estradiol, and verapamil) and personal care product additives (parabens-methyl, ethyl, and propyl derivatives) was investigated in the homogeneous phase (with ferric ions as the catalyst) and on TiO2. Ferric ions in concentrations corresponding to concentrations in natural water bodies were shown to be a significant accelerator of the degradation in homogeneous reaction mixtures. In heterogeneous photocatalytic reactions on TiO2, lower reaction rates, but mineralisation to higher extents, were observed...
December 2, 2016: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/27901017/daily-intake-and-hazard-index-of-parabens-based-upon-24%C3%A2-h-urine-samples-of-the-german-environmental-specimen-bank-from-1995-to-2012
#4
Rebecca K Moos, Petra Apel, Christa Schröter-Kermani, Marike Kolossa-Gehring, Thomas Brüning, Holger M Koch
In recent years, exposure to parabens has become more of a concern because of evidence of ubiquitous exposure in the general population, combined with evidence of their potency as endocrine disruptors. New human metabolism data from oral exposure experiments enable us to back calculate daily paraben intakes from urinary paraben levels. We report daily intakes (DIs) for six parabens based on 660 24 h urine samples from the German Environmental Specimen Bank collected between 1995 and 2012. Median DI values ranged between 1...
November 30, 2016: Journal of Exposure Science & Environmental Epidemiology
https://www.readbyqxmd.com/read/27896884/contact-allergy-to-preservatives-essca-results-with-the-baseline-series-2009-2012
#5
Ana M Giménez-Arnau, Gustavo Deza, Andrea Bauer, Graham A Johnston, Vera Mahler, Marie-Louise Schuttelaar, Javier Sanchez-Perez, Juan Francisco Silvestre, Mark Wilkinson, Wolfgang Uter
BACKGROUND: Allergic contact dermatitis caused by biocides is common, and causes significant patient morbidity. OBJECTIVE: To describe the current frequency and pattern of patch test reactivity to biocide allergens included in the baselines series of most European countries. METHODS: Data collected by the European Surveillance System on Contact Allergies (ESSCA) network between 2009 and 2012 from 12 European countries were analysed. RESULTS: Methylisothiazolinone 0...
November 29, 2016: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/27887697/hypercrosslinked-cholesterol-based-polystyrene-monolithic-capillary-columns
#6
D Grzywiński, M Szumski, B Buszewski
Cholesteryl methacrylate has been used to obtain hypercrosslinked poly(cholesteryl methacrylate-co-4-methylstyrene-co-vinylbenzyl chloride-co-divinylbenzene) monolithic stationary phase for capillary liquid chromatography. Different contents of cholesteryl methacrylate and toluene in polymerization mixture have been tested to obtain chromatographic performance. The best column has been prepared using 7% of cholesteryl methacrylate and 1% of toluene in polymerization mixture. Such a monolithic material exhibited a surface area of 452m(2)/g (BET)...
November 19, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27866342/phototoxicity-and-chronic-toxicity-of-methyl-paraben-and-1-2-hexanediol-in-daphnia-magna
#7
Jiyun Lee, Nayeon Park, Younglim Kho, Kiyoung Lee, Kyunghee Ji
Parabens are used as antimicrobial preservatives in consumer products. Exposure to methylparaben (MP) has been associated with adverse health outcomes, therefore, an alternative compound, 1,2-hexanediol (1,2-H), has been applied for cosmetics. In the present study, the phototoxicity of MP and 1,2-H, as well as the toxic effect caused by chronic exposure, were investigated using Daphnia magna. The 48 h acute toxicity tests with D. magna were conducted under indoor or ultraviolet (UV) light irradiation conditions, i...
November 19, 2016: Ecotoxicology
https://www.readbyqxmd.com/read/27858272/urinary-arsenic-pesticides-heavy-metals-phthalates-polyaromatic-hydrocarbons-and-polyfluoroalkyl-compounds-are-associated-with-sleep-troubles-in-adults-usa-nhanes-2005-2006
#8
Ivy Shiue
Links between environmental chemicals and human health have emerged, but the effects on sleep health were less studied. Therefore, the aim of the present study was to investigate the relationships of different sets of environmental chemicals and common sleep troubles in a national and population-based setting. Data were retrieved from the United States National Health and Nutrition Examination Surveys, 2005-2006 including demographics, serum measurements, lifestyle factors, self-reported sleep troubles, and urinary environmental chemical concentrations...
November 17, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27810681/changes-in-mammary-histology-and-transcriptome-profiles-by-low-dose-exposure-to-environmental-phenols-at-critical-windows-of-development
#9
Kalpana Gopalakrishnan, Susan L Teitelbaum, Luca Lambertini, James Wetmur, Fabiana Manservisi, Laura Falcioni, Simona Panzacchi, Fiorella Belpoggi, Jia Chen
Exposure to environmental chemicals has been linked to altered mammary development and cancer risk at high doses using animal models. Effects at low doses comparable to human exposure remain poorly understood, especially during critical developmental windows. We investigated the effects of two environmental phenols commonly used in personal care products - methyl paraben (MPB) and triclosan (TCS) - on the histology and transcriptome of normal mammary glands at low doses mimicking human exposure during critical windows of development...
January 2017: Environmental Research
https://www.readbyqxmd.com/read/27789887/application-of-fenton-oxidation-to-reduce-the-toxicity-of-mixed-parabens
#10
Rui C Martins, Marta Gmurek, André F Rossi, Vanessa Corceiro, Raquel Costa, M Emília Quinta-Ferreira, Stanislaw Ledakowicz, Rosa M Quinta-Ferreira
The aims of the present work were to assess the application of a chemical process to degrade a mixture of parabens and determine the influence of a natural river water matrix on toxicity. Model effluents containing either a single compound, namely methylparaben, ethylparaben, propylparaben, butylparaben, benzylparaben or p-hydroxybenzoic acid, or to mimic realistic conditions a mixture of the six compounds was used. Fenton process was applied to reduce the organic charge and toxic properties of the model effluents...
October 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27789189/co-exposure-to-non-persistent-organic-chemicals-among-american-pre-school-aged-children-a-pilot-study
#11
Antonia M Calafat, Xiaoyun Ye, Liza Valentin-Blasini, Zheng Li, Mary E Mortensen, Lee-Yang Wong
BACKGROUND: General population human biomonitoring programs such as the National Health and Nutrition Examination Survey (NHANES) in the United States suggest that chemical exposures are common. Exposures during childhood may affect health later in life, but biomonitoring data in NHANES among pre-school aged children are limited. METHODS: A convenience group of 122 3-5year old American boys and girls were recruited in 2013 for a pilot study to assess the feasibility of collecting urine from young children and analyzing it for select chemical exposure biomarkers for future NHANES...
October 21, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/27736692/determination-of-paraben-preservatives-in-seafood-using-matrix-solid-phase-dispersion-and-on-line-acetylation-gas-chromatography-mass-spectrometry
#12
Rosalina Djatmika, Chih-Chung Hsieh, Jhih-Ming Chen, Wang-Hsien Ding
An effective method for determining four commonly detected paraben preservatives (methyl, ethyl, propyl and butyl paraben) in marketed seafood is presented. This method employs matrix solid-phase dispersion (MSPD) before identification and quantification of the paraben preservatives via on-line acetylation gas chromatography-mass spectrometry (GC-MS). Parameters affecting the extraction efficiency of MSPD were optimized through a Box-Behnken design method. Under optimal condition, 0.5-g of freeze-dried seafood was mixed with 0...
October 8, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27711455/crystal-engineering-of-a-zwitterionic-drug-to-neutral-cocrystals-a-general-solution-for-floxacins
#13
Anilkumar Gunnam, Kuthuru Suresh, Ramesh Ganduri, Ashwini Nangia
The transformation of zwitterionic Sparfloxacin (SPX) to the neutral form is achieved by cocrystallization. Neutral forms of drugs are important for higher membrane permeability, while zwitterions are more soluble in water. The twin advantages of higher solubility/dissolution rate and good stability of neutral SPX are achieved in a molecular cocrystal compared to its zwitterionic SPX hydrate. The amine-phenol supramolecular synthon drives cocrystal formation, with the paraben ester acting as a "proton migrator" for the ionic to neutral transformation...
October 18, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27703149/variation-in-urinary-spot-sample-24%C3%A2-h-samples-and-longer-term-average-urinary-concentrations-of-short-lived-environmental-chemicals-implications-for-exposure-assessment-and-reverse-dosimetry
#14
Lesa L Aylward, Sean M Hays, Angelika Zidek
Population biomonitoring data sets such as the Canadian Health Measures Survey (CHMS) and the United States National Health and Nutrition Examination Survey (NHANES) collect and analyze spot urine samples for analysis for biomarkers of exposure to non-persistent chemicals. Estimation of population intakes using such data sets in a risk-assessment context requires consideration of intra- and inter-individual variability to understand the relationship between variation in the biomarker concentrations and variation in the underlying daily and longer-term intakes...
October 5, 2016: Journal of Exposure Science & Environmental Epidemiology
https://www.readbyqxmd.com/read/27693803/determination-of-personal-care-products-benzophenones-and-parabens-in-human-menstrual-blood
#15
I Jiménez-Díaz, L M Iribarne-Durán, O Ocón, E Salamanca, M F Fernández, N Olea, E Barranco
Benzophenones and parabens are synthetic chemicals used in many personal care products, foods and pharmaceuticals. Benzophenones are used to protect the skin and materials from the adverse effects of UV-radiation, and parabens are used as preservatives. Despite their widespread occurrence and proven endocrine disrupting activity, relatively little is known about human exposure to these compounds. In the present work, an analytical method based on sample treatment using dispersive liquid-liquid microextraction (DLLME) for the extraction of six benzophenones (benzophenone-1, -2, -3, -6, -8 and 4-hydroxybenzophenone) and four parabens (methyl-, ethyl-, propyl- and butyl- paraben) from human menstrual blood samples, followed by ultrahigh performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) analysis, is proposed and validated...
November 1, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27659731/parabens-inhibit-fatty-acid-amide-hydrolase-a-potential-role-in-paraben-enhanced-3t3-l1-adipocyte-differentiation
#16
Sean D Kodani, Haley B Overby, Christophe Morisseau, Jiangang Chen, Ling Zhao, Bruce D Hammock
Parabens are a class of small molecules that are regularly used as preservatives in a variety of personal care products. Several parabens, including butylparaben and benzylparaben, have been found to interfere with endocrine signaling and to stimulate adipocyte differentiation. We hypothesized these biological effects could be due to interference with the endocannabinoid system and identified fatty acid amide hydrolase (FAAH) as the direct molecular target of parabens. FAAH inhibition by parabens yields mixed-type and time-independent kinetics...
November 16, 2016: Toxicology Letters
https://www.readbyqxmd.com/read/27642823/occurrence-and-fate-of-endocrine-disrupting-chemicals-in-asp-based-sewage-treatment-plant-in-hardwar
#17
Gita Saini, Shalini Pant, Tanveer Alam, A A Kazmi
The occurrence of emerging contaminants such as endocrine disrupting chemicals (EDCs) in our water resources is of prime concern. With this context, fate and seasonal variation of six EDCs (testosterone, T; progesterone, P; diethyl phthalate, DEP; dibutyl phthalate, DBP; propyl-paraben, PP and butyl-paraben, BP) were assessed throughout the year, i.e. in rainy, winter, spring and summer seasons in the raw, treated wastewater and activated sludge in an activated sludge process (ASP) based sewage treatment plant (STP) located in Haridwar, India...
September 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27621134/ultrasound-assisted-surfactant-enhanced-emulsification-micro-extraction-followed-by-hplc-for-determination-of-preservatives-in-water-beverages-and-personal-care-products
#18
Sudarat Jan-E, Yanawath Santaladchaiyakit, Rodjana Burakham
An ultrasound-assisted surfactant-enhanced emulsification micro-extraction (UASEME) procedure has been developed for pre-concentration of benzoic acid (BA) and paraben preservatives, including methylparaben, ethylparaben, propylparaben and butylparaben, prior to high-performance liquid chromatography-ultraviolet (HPLC-UV) analysis. Separations were performed on a Lichrospher RP-18 endcapped 5 µm, using an isocratic mobile phase of 40% acetonitile, at a flow rate of 1 mL min(-1) The selected UASEME conditions comprised the use of 10 mL sample extract, 125 µL 1-octanol as extraction solvent and 0...
September 12, 2016: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/27618523/fate-and-control-of-pathogenic-and-spoilage-micro-organisms-in-orange-blossom-citrus-aurantium-and-rose-flower-rosa-centifolia-hydrosols
#19
C Labadie, C Cerutti, F Carlin
AIM: Hydrosols are hydrodistillation products used in food and cosmetic industries, perfumery, pharmacy and aromatherapy. The ability of preservatives to control previously reported bacterial proliferation and spoilage was evaluated. All tested preservatives were authorized for food and cosmetic application. METHODS AND RESULTS: Major pathogens of concern for foods and cosmetics were poorly able to grow in rose and orange blossom hydrosols when inoculated and incubated at 30°C...
December 2016: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/27613147/preparation-of-an-adsorbent-based-on-polymeric-ionic-liquid-for-the-simultaneous-extraction-of-acidic-basic-and-neutral-pollutants
#20
Lei Chen, Xiaojia Huang
In this study, coextraction of acidic, basic and neutral pollutants was realized with a new adsorbent based on polymeric ionic liquid (PIL). In the presence of a porogen solvent containing 1-propanol and 1,4-butanediol, an ionic liquid, 1-vinyl-3-octylimidazolium tetrafluoraborate was used as monomer to copolymerize with dual cross-linkers (divinylbenzene and N,N-methylene-bisacrylamide) to form the adsorbent for stir cake sorptive extraction (SCSE). Phenols, aromatic amines and parabens were selected as acidic, basic and neutral model analytes, respectively...
September 30, 2016: Journal of Chromatography. A
keyword
keyword
21127
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"