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Results 601 - 650 of 665
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Bass E V - - 1992
All dual-arch impression techniques utilize special stock impression trays of various designs. These trays are made of flexible plastic with fabric or mesh material placed across the occlusal surfaces of the teeth connecting their buccal and lingual flanges. The presence of this material will result in errors by (1) not ...
Sharp G J - - 1992
The migration-inducing abilities of both synthetic lipoxin A4 (LXA4) and leukotriene B4 (LTB4) for rainbow trout neutrophils were examined with an in vitro assay. LXA4 caused enhanced migration of these cells with a three- to fourfold greater response than that observed toward LTB4 at most concentrations tested. Checkerboard assays showed ...
Jickells S M - - 1992
Experiments have been carried out with (a) microwave treatment of plastics followed by migration testing using the food simulant, olive oil, and (b) microwave treatment of plastics in direct contact with an organic extractant (iso-octane). In neither of these complementary approaches was there evidence of any difference in migration from ...
Castle L - - 1991
Mineral hydrocarbons are used as processing aids at levels between 0.3 and 3% by weight in crystal polystyrene articles, the food contact uses of which include the dispensing of hot and cold beverages from automatic machines as well as in 'fast-food' and catering establishments. The levels of migration of mineral ...
Grob K - - 1991
Paraffins from raw extracts of foods and packing materials were isolated by LC and directly transferred to GC, applying concurrent eluent evaporation and a loop-type interface. Paraffins from various packing materials have been characterized: sisal bags, cardboard boxes, plastic films, wax-coated paper and cardboard as well as paraffin coatings. Important ...
Castle L - - 1991
To assess the significance of migration of polymeric plasticizers into foods, chemical characterization and quantification of individual oligomeric species is required. This paper reports the identification of seven individual oligomers isolated from a poly(butylene adipate) plasticizer. Based on mass spectrometry, NMR and chemical degradation, the oligomers were identified as a ...
Weisel C - - 1991
The presence of lead in labels painted on soft plastic bread packaging was evaluated. Lead was detected on the outside of 17 of 18 soft plastic bread bags that were analyzed, with an average of 26 +/- 6 mg per bag with lead. Of 106 families questioned, 16 percent of ...
Smerasta P - - 1991
Migration and material tests of food-contact plastic wares were carried out in compliance with the Thai Food Act. Sample materials studied were melamine resin, polyethylene, polypropylene, polystyrene, and polyvinyl chloride. Migration levels of phenol, formaldehyde, colors and heavy metals were determined. A test for vinyl chloride monomer in polyvinyl chloride ...
Karel M - - 1991
A number of operations in food processing, and the stability of stored foods, are affected by diffusional properties of food systems, which include the foods themselves, their immediate environment within a package, and any barriers (packaging or coating) used with the foods. Water content and "water activity" affect these diffusional ...
Lickly T D - - 1991
The correlation of residual acrylonitrile (AN) monomer concentration in AN-containing polymers with AN migration into food simulants is of interest because the US FDA regulates the use of these polymers on the basis of the amount of AN that may migrate into food simulants. Studies of the migration of AN ...
Begley T H - - 1990
A quantitative method has been developed to measure the migration of polyethylene terephthalate (PET) cyclic oligomers from aluminized PET susceptor film-type food packaging into several food types. Microwaveable French fries, popcorn, fish sticks, waffles and pizza sold in susceptor-type packaging were purchased in local markets, cooked according to package instructions ...
Lickly T D - - 1990
Alternatives to highly-volatile ethanol or analytically complex cooking oil were examined as potential fatty-food simulants which would undergo high-temperature exposures to food-packaging polymers in food-packaging evaluation studies. The alternatives consisted of alcohols containing four to eight carbons. As test cases, the migration of Irganox 1010 antioxidant from high-density polyethylene and ...
Castle L - - 1990
Temperatures have been measured using a fluoro-optic probe at the food/container or food/packaging interfaces as appropriate, for a range of foods heated in either a microwave or a conventional oven. Reheating ready-prepared foods packaged in plastics pouches, trays or dishes in the microwave oven, according to the manufacturers' instructions, resulted ...
Begley T H - - 1990
The polymer polyethylene terephthalate (PET) is widely used for packaging food that will be heated or cooked in the PET container. A procedure was developed to predict the potential of PET to migrate from the container into the food. Migration experiments using crystallized polyethylene terephthalate (CPET) and corn oil were ...
Kim-Kang H - - 1990
The increasing application of complex natural and/or synthetic polymers to food packaging has required definitive information on the characteristics of the finished products. High temperature encountered during the manufacturing process may induce thermal decomposition products that can migrate into the packaged product and cause undesirable flavor. A general methodology for ...
Sujoldzić A - - 1989
For several centuries the village populations on the Yugoslav island of Korcula have remained essentially isolated from each other and from the mainland. Historical, linguistic and biological data indicate that systematic population pressure predominantly came from the coastal area of the Balkan peninsula westward onto the island. To examine short ...
Castle L - - 1989
It has been demonstrated that on storage of a tightly wound reel of polypropylene packaging film, specially printed for experimental purposes, transfer can occur of components from the ink on the outer surface of the film on to the inner food contact surface. For dicyclohexyl phthalate this transfer amounted to ...
Autier P - - 1989
In the Sahel, migration is of considerable importance. It permits the peasants to adjust to variable food conditions. In areas affected by food shortages, cluster sample studies of villages showed that, as the number of recently abandoned houses in a cluster increased, the prevalence of malnutrition decreased, and this linear ...
Leadbeatter S - - 1989
An 84-year-old woman died suddenly 20 days after a head injury; a medical witness to the death described laboured breathing consistent with stridor. At postmortem examination, her larynx was found to be occluded by a firm mass of jelly-like material considered initially to be regurgitated food material. The microscopic features ...
Cumpstey M - - 1989
In 1989 the European Space Agency will launch the Olympus Communications Satellite, paid for by seven European nations and intended for experiment and demonstration. A number of the facilities will be offered free for a period of up to 5 years in order to stimulate new uses and services. Many ...
Bergeron J M - - 1989
Recent studies suggest that diet quality is responsible for differential survivorship of vole cohorts (Boonstra and Boag 1987) and spacing behavior of females (Ims 1987). These phenomena have been related either to a lack of or a deterioration in the quality of the preferred food. To test this hypothesis, we ...
King D J - - 1989
The purpose of this paper is to present information gathered regarding, in general, the physical characteristics, and, in particular, the possible toxic nature of polyacrylamide A short discussion of the properties and toxicity of the acrylamide monomer is also included. The United States government, specifically the Food and Drug Administration ...
Castle L - - 1988
Chocolates, boiled sweets, toffees, cakes and meat pies were wrapped in regenerated cellulose films (with or without coatings) that contained various mixtures of glycol softeners and which had been specially formulated for particular food applications. Samples were unwrapped at intervals (up to the end of the usual maximum shelf-life for ...
Shenassa M M - - 1988
The purpose of this review is to establish a rational approach to the assessment of children with food allergy related to an immunologic state in which alteration of response to antigenic material has developed after repeated exposure. The author offers a practical approach to the problem of food allergy in ...
Milner R H - - 1988
Twenty-four patients were studied after the application of plasticized polyvinyl chloride (PVC) film as a temporary burns dressing. The burns were assessed as being partial thickness (nine patients) and full thickness (15 patients) in depth and involving 2 per cent to 35 per cent of the body surface area. Microbiological ...
Castle L - - 1988
A UK survey of plasticizer levels in retail foods (73 samples) wrapped in plasticized films or materials with plasticized coatings has been carried out. A wide range of different food-types packaged in vinylidene chloride copolymers (PVDC), nitrocellulose-coated regenerated cellulose film (RCF) and cellulose acetate were purchased from retail and 'take-away' ...
Wams T J - - 1987
Di(2-ethylhexyl)phthalate (DEHP) is a priority pollutant in several countries; annual production amounts to 3-4 million tonnes. Approximately 95% is used as a plasticizer in polyvinylchloride (PVC). DEHP is emitted to the environment during the production of plastics and plastic products, during their use and after disposal. In the environment, physico-chemical ...
Startin J R - - 1987
Migration of di-(2-ethylhexyl)adipate (DEHA) into a diverse range of foods arising from the domestic use of plasticized PVC films has been determined using a stable isotope dilution GC/MS procedure. Aspects of home use reported in this study include the wrapping and covering of foods such as cheese, cooked meats, sandwiches, ...
Castle L - - 1987
A UK survey of di-(2-ethylhexyl)adipate (DEHA) levels in retail foods (83 samples) wrapped in plasticized PVC film has been carried out, examining a wide range of different food types obtained from retail and take-away outlets. Foodstuffs analysed included fresh meat and poultry, ready-cooked poultry, cheese, fruit, vegetables and baked goods ...
Tice P A - - 1987
In the European Community regulatory approaches adopted by individual Member States to the control of food contact plastics differ markedly and, as a result, the European Commission has identified a need for harmonized legislation in this sector. The Commission requested its Scientific Committee for Food to advise on the toxicity ...
Schwope A D - - 1987
The most widely used food-wrapping material is low-density polyethylene (LDPE). Food-wrap grades contain antioxidants to minimize degradation during processing and, in the final films, such additives are normally present at levels of several hundred ppm. During use, the antioxidants may migrate into food stored in LDPE wraps. Two typical antioxidants, ...
Schwope A D - - 1987
In a series of experiments on the migration of the antioxidant Irganox 1010 from ethylene-vinyl acetate (EVA) films into food-simulating liquids and foods, the antioxidant was found to migrate rapidly from EVA film into n-heptane, 100% ethanol and corn oil. The rate of migration into these media was greater from ...
Till D - - 1987
Many foods contact polymeric packaging materials which contain residues of the polymerization process or additives employed to facilitate processing. The extent of migration of such materials from the packaging to foods is the focus of the present article. A major experimental program using eight polymer-migrant systems is described. Migration was ...
Gilbert J - - 1986
Plastics additives and processing aids present severe difficulties for the legislator attempting to establish meaningful controls. In many cases information both on the substances added to the plastic and on the species migrating into food, which may well be different, are lacking. In the studies reported, information has been sought ...
Clausen S - - 1986
Food packaging information can benefit those involved with procurement of food products; however, available information is limited. A mail survey of 271 hospital administrative dietitians and 29 foodservice directors was conducted to investigate their perceptions and knowledge of food packaging functions, packaging information, and packaging materials and forms. Data from ...
Gramiccioni L - - 1986
Global migration from several plastics (phthalate-plasticized PVC, polyurethane, polyether-polyamide copolymer and silicone rubber) into olive oil, used as a liquid simulant for fatty foods, was compared with global migration into isooctane, which has been proposed as a new fatty-food simulant. The results showed that the isooctane test (involving contact for ...
McComb P F - - 1986
The purpose of this study was to assess the incidence and direction of the transperitoneal migration of ova in the rabbit. Sixteen New Zealand white rabbits underwent unilateral microsurgical enclosure of either the left (n = 9) or right (n = 7) ovary within a peritoneal bursa. Each animal was ...
Pratt P C - - 1985
The subserosal stroma of hernia sacs consistently contains birefringent particulate material, in amounts greater than those observed in other intra-abdominal organs. The major component of this material was shown in the present study to be talc; thus, it cannot be of endogenous origin. Cellular response to this foreign material is ...
Stofberg J - - 1985
The toxicological testing of the millions of known chemicals or even the thousands of food components is not practical at present. Therefore, priorities for testing should be set carefully, to ensure that primary attention is given to materials for which risk management can potentially improve public health. Most flavouring materials ...
Snyder R C - - 1985
A new cell was evaluated for studying the migration of components of plastic food packaging materials into various food simulating solvents. Data obtained using this cell to study the migration of styrene from polystyrene at 40 and 70 degrees C are presented. Food simulating solvents tested were: water; 3% acetic ...
Page B D - - 1985
The previously described headspace-gas chromatographic procedure for the determination of acrylonitrile (AN) in several foods, with N/P selective detection, has been modified to include packaged luncheon meats. The loss of AN during equilibration at 100 degrees C in meat samples as well as the previously described loss in cold pack ...
Sutow E J - - 1985
The crevice corrosion susceptibility of cold-worked Type 316LVM stainless steel, cast Co-Cr-Mo, wrought Co-Cr-W-Ni, non-nitrided and nitrided Ti-6Al-4V ELI, and c.p. Ti, Grades 1 and 4, was studied in vitro by means of a crevice cell. Occlusion was created by interfacing a disc specimen and a Teflon bar. Specimens were ...
Bieber W D - - 1984
The transfer of stearyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate from high- and low-density polyethylenes and polypropylene as well as that of n-butyl stearate from high-impact polystyrene into several foodstuffs and into different food simulants under normal storage conditions was determined radioanalytically. Additionally, the transfer of these additives into the food simulants under the standard ...
Gulati R D - - 1983
The existing data on the species composition of zooplankton and grazing intensities of crustacean plankton are discussed in the light of trophic status, particularly in the Dutch lakes of varying trophy. Several species of rotifers in northern Europe and North America are considered to indicate eutrophic environments. However, unanimity is ...
de Kruijf N - - 1983
A study was carried out to establish whether the draft EEC method for determining overall (global) migration of the constituents of plastics-packaging materials into a fatty-food simulant could be applied to samples of commercially available homogeneous plastics materials and whether it would be possible to use extraction with a volatile ...
van Battum D - - 1982
An experimental study was carried out to establish whether the draft EEC method for the determination of the global migration of constituents from plastics packaging materials into fatty food simulants could be applied to all plastics, including lacquers and laminates. Some difficulties were encountered in the use of the EEC ...
Till D E - - 1982
Polyvinyl chloride (PVC) films used for food wraps contain significant concentrations of plasticizers, along with other additives. The rate of migration of these plasticizers to foods and food-simulating solvents is the principal concern of this paper, which reviews prior experimental studies and presents new data for radiolabelled dioctyl adipate. Analytical ...
Heath J L - - 1981
Migration of the plasticizer acetyl-tributylcitrate from a plastic film into poultry meat and model food systems was studied. It was determined that this commonly used plasticizer migrated from the plastic film during microwave cooking by comparing the infrared spectra of the film used to cover the chicken to unused film. ...
Hollifield H C - - 1981
A rapid approach to the tentative identification of food packaging-derived volatile residues in foods and containers by use of headspace sampling, capillary gas chromatography, and a computer data search program is described. Headspace vapors of samples are analyzed on Ov-101 and Carbowax 20M columns. Peak retention time data of a ...
Rizvi S S - - 1981
The requirements of barrier properties of packaging materials against environmental factors vary with food products. The chemical, physical, and biological mechanisms of food deterioration due to environmental factors, vital properties required in packaging materials, and developments in progress and future trends to maintain the required standard of food quality have ...
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