• Together with the polychlorinated dioxins and furans, these two special classes of PCBs are often referred to as "dioxin-like" chemicals because they act in the body through a similar mechanism. (cdc.gov)
  • Concerns of Rillito citizens about emissions of dioxins and furans from the Arizona Portland Cement Plant and stack testing at APCC led to an ambient air monitoring program conducted in 2004 - 2005. (asu.edu)
  • Ambient concentrations of dioxins and furans proved to be within health-based guidelines. (asu.edu)
  • The distribution of the 17 toxic dioxins and furans in the ambient air of Rillito closely resembled the mobile source profile but was quite different from the APCC profile. (asu.edu)
  • 3 ] It is important to note that furan is not the same as "furans", which refers to polychlorinated dibenzofurans, which are often considered together with the chemically similar dioxins. (carexcanada.ca)
  • 3 ] Dioxins and furans have much different chemical structures compared to furan. (carexcanada.ca)
  • The dosages of dioxins and furans in lichens are practiced according to a precise mode of sampling. (aair-lichens.com)
  • Any measure in lichens reports atmospheric transfers of dioxins and furans. (aair-lichens.com)
  • Characterizing exposures to flame retardants, dioxins, and furans among firefighters responding to controlled residential fires. (cdc.gov)
  • Urine samples were analyzed for OPFR metabolites, while serum samples were analyzed for PBDEs, brominated and chlorinated furans, and chlorinated dioxins. (cdc.gov)
  • The dioxin and furan concentrations measured during the one-year study suggested that mobile source emissions had a much greater impact at Rillito than the cement plant emissions. (asu.edu)
  • 17 ] According to studies in the United States and Europe, higher furan concentrations are reported in roasted coffee and foods that were heated in sealed containers, such as canned and jarred foods, and in toasted bread. (carexcanada.ca)
  • espresso has higher levels (88 µg/L) compared to standard drip coffee (18 µg/L). [ 19 ] Jarred baby foods also contain higher concentrations of furan (average 24-28 µg/kg), while furan has not been detected in self-prepared baby foods. (carexcanada.ca)
  • Dietary exposure modeling for the U.S. population, based on measured concentrations of furan in numerous foods conducted by CFSAN/FDA (Morehouse et al. (nih.gov)
  • Body burden levels of dioxin, furans, and PCBs among frequent consumers of Great Lakes sport fish. (cdc.gov)
  • To avoid getting left behind in an intensive competitive Furan Resins market, global companies need a new approach to ensure they create value in this environment. (researchandmarkets.com)
  • Amid increasing activities of M&A and growing activist-investor activity, Furan Resins companies must strengthen their capabilities to maintain their market shares in the Furan Resins industry. (researchandmarkets.com)
  • The report explores changing Furan Resins market landscape, capital markets, strategies, mergers & acquisitions in the global and country-level markets. (researchandmarkets.com)
  • The report presents an introduction to the Furan Resins market in 2020, analyzing the COVID-19 impact both quantitatively and qualitatively. (researchandmarkets.com)
  • It presents the strategies being adopted by leading Furan Resins companies, emerging market trends, Furan Resins market drivers, challenges, and potential opportunities to 2030. (researchandmarkets.com)
  • The market attractiveness index is also included to assess the impact of suppliers, buyers, competitive landscape, new entrants, and substitutes on the Furan Resins market. (researchandmarkets.com)
  • The global Furan Resins market size is forecast across different scenarios including the actual forecasts and COVID affected forecasts from 2022 to 2030. (researchandmarkets.com)
  • Further, Furan Resins market revenue and market shares in the global industry are forecast across different types of Furan Resins, applications, and end-user segments of Furan Resins and across 18 countries. (researchandmarkets.com)
  • The report presents the 10 leading Furan Resins companies in the global industry including details of business overview, business operations, SWOT profile, and Furan Resins products. (researchandmarkets.com)
  • Furan Resins market news and market developments since 2022 including asset purchases, new manufacturing units, product launches, and mergers & acquisitions are included. (researchandmarkets.com)
  • In this context, ASK Chemicals has developed MAGNASET as new generation of furan resins with reduced free furfuryl alcohol content featuring a milder classification and a performance comparable to conventional furan resins. (foundry-planet.com)
  • Furan is also used to make some lacquers, as a solvent for resins, and to produce pharmaceuticals, agricultural chemicals, and stabilizers. (carexcanada.ca)
  • In contrast to phenolic-urethane or ester-curing phenolic systems, which are based on petrochemical components, furan binders are based on furfuryl alcohol, which is a readily available renewable raw material derived from agricultural waste such as corn husks or rice hulls. (foundry-planet.com)
  • Furan (CASRN: 110-00-9) is formed in many common foods during heating of either ascorbate, carbohydrates (with or without an amino acid), or polyunsaturated fatty acids (Locus and Yaylayan, 2004). (nih.gov)
  • The reaction product is a mixture of isomers with preference for the endo isomer: Diels-Alder reaction of furan with arynes provides corresponding derivatives of dihydronaphthalenes, which are useful intermediates in synthesis of other polycyclic aromatic compounds. (wikipedia.org)
  • Using the DIN 61198 procedure, it determines furan derivatives dissolved in oil, which can originate from the insulting paper, in 10-ml oil samples. (oelcheck.com)
  • Relevant processes are roasting, extruding, baking, puffing or pasteurizing, so that furan and its structural derivatives have already been detected in coffee, fruit juices, baby food and cereal products. (uni-muenster.de)
  • Furan is used to manufacture the chemicals tetrahydrofuran, pyrrole, and thiophene. (carexcanada.ca)
  • Exposure to furan at doses about 2,000 times the projected level of human exposure from foods increases the risk of hepatocellular tumors in rats and mice and bile duct tumors in rats. (wikipedia.org)
  • 5 ] While no studies have examined the relationship between exposure to furan and cancer risk in humans, a link between furan and liver tumors has been reported in both rats and mice. (carexcanada.ca)
  • Industrially, furan is manufactured by the palladium-catalyzed decarbonylation of furfural, or by the copper-catalyzed oxidation of 1,3-butadiene: In the laboratory, furan can be obtained from furfural by oxidation to 2-furoic acid, followed by decarboxylation. (wikipedia.org)
  • Tetra Hydro Furan is a highly popular solvent, demanded for small-scale laboratory experiments. (ankitenterprise.co.in)
  • Chemical compounds containing such rings are also referred to as furans. (wikipedia.org)
  • citation needed] In the Achmatowicz reaction, furans are converted to dihydropyran compounds. (wikipedia.org)
  • To determine if furan is genotoxic in vivo, female B6C3F1 Big Blue transgenic mice were treated with 15. (umn.edu)
  • There are other studies demonstrating regenerative cell proliferation secondary to such doses of furan and it is not possible to distinguish dose-response characteristics of genotoxic effects from chemically reactive furan metabolites (e.g., cis -2- butene-1,4-dial) from those of compensatory hyperplasia secondary to hepatotoxicity (Wilson et al. (nih.gov)
  • An overview of Genetic Toxicology Rodent Cytogenetics study conclusions related to Furan (110-00-9). (nih.gov)
  • Furan has been classified by the International Agency for Research on Cancer (IARC) as Group 2B, possibly carcinogenic to humans. (carexcanada.ca)
  • Rats were more sensitive to the carcinogenic effects of furan than mice, with nearly all dosed males and females showing cholangiocarcinomas versus none in the controls. (nih.gov)
  • Furan is classified by the International Agency for Research on Cancer (IARC) as possibly carcinogenic to humans (category 2B), so the aim is to minimize the intake of the substances. (uni-muenster.de)
  • Furan is a heterocyclic organic compound, consisting of a five-membered aromatic ring with four carbon atoms and one oxygen atom. (wikipedia.org)
  • Pyrrole can be prepared industrially by treating furan with ammonia in the presence of solid acid catalysts, such as SiO2 and Al2O3. (wikipedia.org)
  • Histopathological analysis of livers from furan-treated mice revealed that furan induced multifocal, hepatocellular necrosis admixed with reactive leukocytes and pigment-laden Kupffer cells, enhanced oval-cell hyperplasia, and increased hepatocyte mitoses, some of which were atypical. (umn.edu)
  • 6 ] Other animal studies have also found a relationship between furan exposure and bile-duct cancer, as well as mononuclear cell leukemia in rats. (carexcanada.ca)
  • Furan exposure can be detected in cigarette smoke, wood smoke, and exhausts from automobile engines. (carexcanada.ca)
  • The widespread exposure to furan through the diet is a public health concern because of the demonstrated potential for hepatotoxicity and carcinogenicity observed in two rodent species, particularly the high incidences observed for cholangiocarcinomas in male and female F344 rats in the previous NTP 2 y studies. (nih.gov)
  • There are several key issues that need to be addressed in order to understand the human cancer risks associated with furan exposure. (nih.gov)
  • An abstract notes that occupational exposure to "furan resin sand" (no further details on composition) was associated with "acute restrictiveness" identified in lung function tests following a work shift (39 exposed moulders and core makers and 27 unexposed local controls were examined). (europa.eu)
  • A standard text notes that furan is "highly toxic by inhalation in animals" and that "dogs and rabbits collapsed and died after two inhalations from saturated cotton wool" (Browning, 1965). (europa.eu)
  • Citation: Burka LT, Washburn KD, Irwin RD. Disposition of [14C] furan in the male F344 rat. (nih.gov)
  • Furan serves as a diene in Diels-Alder reactions with electron-deficient dienophiles such as ethyl (E)-3-nitroacrylate. (wikipedia.org)
  • A promising, sustainable route to synthesize aromatics from biomass-derived furans has recently been proposed following the discovery that DMF and ethylene can be selectively converted to p-xylene by dehydration of the Diels-Alder product over zeolites that contain Brønsted sites. (udel.edu)
  • A convenient synthesis of various substituted hexahydroindolinones has been achieved by an intramolecular Diels-Alder cycloaddition (IMDAF) reaction of 2-amido substituted furans. (elsevierpure.com)
  • The Feist-Benary synthesis is a classic way to synthesize furans. (wikipedia.org)
  • Many routes exist for the synthesis of substituted furans. (wikipedia.org)
  • Like enol ethers, 2,5-disubstituted furans are susceptible to hydrolysis to reversibly give 1,4-diketones. (wikipedia.org)
  • BS 4994 - Furan resin as thermoset FRP for chemical process plant equipments Furanocoumarin Furanoflavonoid Furanose Furantetracarboxylic acid Simple aromatic rings Furan fatty acids Tetrahydrofuran Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). (wikipedia.org)
  • Furan determination of the used transformer oil now provides a much simpler and cheaper alternative. (oelcheck.com)
  • Furan determination is now available as a special test. (oelcheck.com)
  • Furan is an abundant food and environmental contaminant that is a potent liver carcinogen in rodent models. (umn.edu)
  • Furan is a clear, colourless, and volatile organic compound with an ethereal odor. (carexcanada.ca)
  • Furan is used as a starting point for other speciality chemicals. (wikipedia.org)
  • ASK Chemicals has a strong background in Furan NoBake (FNB) chemistry and provides customer-made solutions based e.g., on their signature product ASKURAN for several decades. (foundry-planet.com)
  • 12 ] Health Canada stated that furan is formed by the oxidation of polyunsaturated fatty acids, which happens while heating certain foods. (carexcanada.ca)
  • What is the order of stability of the resonance structures of furan? (stackexchange.com)
  • I want to know which are the most stable furan resonance structures. (stackexchange.com)
  • begingroup$ I think your structures 2-5 have a problem as they are lacking a negative charge to balance the positive charge… furan is a neutral molecule, as indicated in your structure 1. (stackexchange.com)
  • the furan does not morph back and forth among the various structures. (stackexchange.com)
  • 4 , 5 ] Furan is used in some chemical manufacturing and is also present in low levels in heat treated foods such as canned or jarred foods. (carexcanada.ca)
  • Furan was not included in other Canadian government guidelines, standards, or chemical listings reviewed . (carexcanada.ca)
  • Aolisenchem provides chemical intermediates (6-Phenyldibenzo[b,d]furan-4-yl)boronic acid CAS#1010068-85-5, which can be used as pharmaceutical intermediate. (aolisenchem.com)
  • Oxidative metabolism of furan and formation of potential biomarkers. (nih.gov)
  • Research has indicated that coffee made in espresso makers and coffee made from capsules contain more furan than that made in traditional drip coffee makers, although the levels are still within safe health limits. (wikipedia.org)
  • Furan binders have been introduced in the late 1950s and due to their self-curing ability under acidic conditions at ambient temperature (absence of heat), furan binders can be described as first true NoBake binder. (foundry-planet.com)
  • Furan is a colorless, flammable, highly volatile liquid with a boiling point close to room temperature. (wikipedia.org)
  • Furan is also present in oils isolated from distilling pine wood containing resin, [ 15 ] and in volatile emissions from sorb trees (which do not grow in Canada). (carexcanada.ca)
  • The greatest influence of heat and the highest furan content overall can be found in the puffed grains. (uni-muenster.de)
  • The first furan derivative to be described was 2-furoic acid, by Carl Wilhelm Scheele in 1780. (wikipedia.org)
  • 2] To enhance tensile strengths and mechanical flexibility as well as the mold handling characteristics of the furan binders, polymers based on urea and formaldehyde are typically added. (foundry-planet.com)
  • Furan is found in heat-treated commercial foods and is produced through thermal degradation of natural food constituents. (wikipedia.org)
  • Demonstrates a rapid method for the identification and quantification of furan in food samples, using gas chromatography with headspace sampling and mass spectrometry. (chromatographyonline.com)
  • Information on how furan arises in food and beverages is somewhat limited to date. (carexcanada.ca)
  • 3 ] Hypotheses put forward by a number of agencies and scientists center around furan being formed from the heating and subsequent breakdown of components of food and beverages. (carexcanada.ca)
  • Prior to 2004, furan in food was thought of as a very limited issue. (carexcanada.ca)
  • 2008), predicts mean consumption of 0.26 g/kg bw/d furan in adult foods (persons over 2 yr of age), 0.41 g/kg bw/d in children's food (0-1 yr of age), and 0.9 g/kg bw/d in infants consuming formula as the primary source of nutrition. (nih.gov)
  • Furan and alkylfurans are formed as so-called process induced contaminants similar to the much better known acrylamide when food is heated. (uni-muenster.de)
  • High pressure and high temperatures are required to puff the cereal grains, so that furan levels of up to 231 µg/kg and total furan levels of over 600 µg/kg could be detected in these products. (uni-muenster.de)
  • An indirect mechanism of genotoxicity is proposed in which chronic toxicity followed by inflammation and secondary cell proliferation triggers cancer development in furan-exposed rodents. (umn.edu)
  • Furan, 2-methylfuran (2-MF) and 2-pentylfuran (2-PF) were most strongly present in the samples. (uni-muenster.de)