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At least 829 records · Page 46Linked to original sources
PubMed1993

Increased urinary excretion of the oxidative DNA adduct, 8-hydroxydeoxyguanosine, as a possible early indicator of occupational cancer hazards in the asbestos, rubber, and azo-dye industries.

Oxidative damage to DNA has been suggested to contribute to a number of diseases including cancer. In order to study the relationship between oxidative damage to DNA and occupational exposures, urinary excretion of the oxidative DNA adduct, 8-hydroxydeoxyguanosine (8-OHdG), was determined in asbestos workers, rubber workers, azo-dye workers and controls. Levels of 8-OHdG in urinary samples were quantified by automated coupled-column high-performance liquid chromatography with electrochemical detection (HPLC-EC). The registered 8-OHdG levels were 1.40 +/- 0.56 mumol/mol creatinine in asbestos workers, 1.48 +/- 0.57 in rubber workers, 1.92 +/- 0.85 in azo-dye workers and 1.07 +/- 0.41 in controls (means +/- SD). Thus, 8-OHdG levels appeared to be significantly higher (p < 0.05) in each of the exposed groups than in the control group. Regression analysis revealed no important association between 8-OHdG excretion, age and smoking. These findings suggest that occupational exposures may contribute to an increased oxidative damage to human DNA and point to the possible use of urinary 8-OHdG assays in biomonitoring of biological effects of chemicals in selected industrial workplaces.

8-Hydroxy-2'-Deoxyguanosine↗
PubMedDate not supplied

Gas chromatographic/thermal energy analyzer method for N-nitrosodibenzylamine in hams processed in elastic rubber netting.

We previously described a solid-phase extraction (SPE) procedure for determining volatile nitrosamines in hams processed in elastic rubber nettings. This same procedure was found to successfully isolate N-nitrosodibenzylamine (NDBzA), a semivolatile nitrosamine. This nitrosamine may form as a result of the reformulated rubber now used in nettings. Reformulation became necessary because of the reported presence of N-nitrosodibutylamine in both the old nettings and on the exterior portion of commercial hams. After SPE, NDBzA was quantitated by using a gas chromatographic (GC) system interfaced to a nitrosamine-specific chemiluminescence detector [thermal energy analyzer (TEA)]. The GC system was equipped with a heated interface external to the TEA furnace to facilitate quantitation of NDBzA. With separation on a packed column, the method can be used to analyze 10 volatile nitrosamines and NDBzA. Repeatability of the method for NDBzA was found to be 2.1 ppb, and the coefficient of variation (CV) was 10.6%. Analysis of 18 commercial hams from 9 different producers, purchased from local retailers, indicated that 12 were positive for NDBzA (range, 2.6-128.5 ppb). NDBzA was confirmed by GC/mass spectrometry.

Animals↗
PubMed1994

Serologic methods in the laboratory diagnosis of latex rubber allergy: study of nonammoniated, ammoniated latex, and glove (end-product) extracts as allergen reagent sources.

In the absence of approved natural rubber latex skin testing reagents, serologic methods for the detection of latex-specific immunoglobulin E (IgE) antibody are useful in the definitive diagnosis of latex allergy. In this study we examined extracts from two nonammoniated latex (NAL), two ammoniated latex (AL), and three diverse latex rubber gloves as sources of allergen for their utility in solid phase radioimmunoassays (SPRIAs) for latex-specific IgE. Serum samples were collected from 46 healthcare workers (HCWs), one beautician, two clerks, and seven children with spina bifida who exhibited clinical evidence of latex-associated contact dermatitis (CD, n = 8), contact urticaria (CU) with or without CD (n = 15), or systemic reactions involving respiratory symptoms with or without anaphylaxis (n = 33) and from 10 latex-exposed HCW control subjects with no latex allergy symptoms. Serum samples were coded and analyzed in a blinded manner in two laboratories by three particulate and four nonparticulate SPRIAs with different latex extracts on the allergosorbent. Intraassay coefficient of variation as assessed with 44 split, randomized, blinded serum specimens was < 20%. Agreement within a source of latex (e.g., NAL, AL, or gloves) and between laboratories was > 90% concordant for Glove 1/Glove 2 and NAL1/2. Specific IgE antilatex was detected in one of 10 latex-exposed control serum samples by five of the seven SPRIAs, despite a lack of clinical evidence for latex allergy in this otherwise atopic individual. Latex-specific IgE was detected in the serum of 22% of subjects with CU with or without CD, suggesting that IgE antibody may not be the primary factor involved in the induction of these local reactions. Approximately two thirds of the systemic reactor group had detectable latex-specific IgE in their serum, with levels ranging from 0.7 to 338 ng/ml. The predictive characteristics of these assays will await future provocation testing. We conclude that glove extracts contain as complete a repertoire of allergens as the NAL and AL. Of the three source latex materials, NAL and glove extracts provided the most sensitive and greatest consistency of IgE antibody results between laboratories.

Adult↗
PubMed1993

[Delayed allergy against rubber gloves. An occupational dermatitis among health personnel].

Allergic reactions to rubber gloves, an increasing problem in medical health services, have become an prominent topic in occupational dermatology. A broad spectrum of immunological mechanisms are involved, from antibody-induced immediate reactions to delayed cell-mediated reactions. We review the causes of the reactions and discuss diagnostic procedures. The main allergens are rubber additives, such as accelerators and antioxidants. In this connection it is important to develop and produce gloves using other basic materials and ingredients, and thereby avoid the most frequent allergens.

Dermatitis, Occupational↗
PubMed1995

[Do employees in the rubber industry have an increased risk of laryngeal cancer?].

Blue collar workers in the rubber industry are exposed to a number of toxic and potentially carcinogenic substances. In the last years an increased incidence of laryngeal cancer has been found in this group of workers. Besides naphthylamine, asbestos, vulcanization fumes and especially nitrosamines have been considered as possible causative agents. The present paper reviews the most relevant epidemiological studies on this topic published within the last 12 years and includes 17 cohort studies and 5 cases control studies. Only some of these papers indicate an increased risk for head and neck cancer due to employment in the rubber industry. Further in most studies the reported standard mortality ratios or relative risk ratios were not increased significantly. In nearly all of these studies an adjustment was not made for alcohol and tobacco consumption to compromise findings.

Carcinogens↗
PubMed1995

A novel rubber dam system for the simultaneous isolation of teeth and gingival tissues.

The present article introduces a rubber dam system developed for the simultaneous isolation of teeth and gingival tissues. The rubber dam device is fabricated from simple, easy-to-fine, and inexpensive materials, such as iron-core elastic tube, latex sheets, expanding screws, dental acrylic resin, and glue. Measurements of the dimensions of the maxillas and mandibles of 100 patients indicated that three prefabricated sizes of the device (small, medium, and large) can be applied in the majority of individuals.

Adolescent↗
PubMedDate not supplied

Effect of sterilization on stiffness and dimensional stability of rubber-dam clamps.

Simulated clinical conditions were used to test the effect of sterilization on rubber-dam clamp stiffness and dimension. Sixty Hygienic and Ivory W7 clamps were either steam or dry heat sterilized and compared to controls. Stiffness and dimensional change between Ivory clamp groups was significant (p<.0001); the sterilized clamps showed less change than the controls. Hygienic groups showed a significant different between the control and dry heat groups (p<.05); the sterilized clamps showed less change than the controls. The change in stiffness and interjaw width for all Ivory clamps compared to all Hygienic clamps was significant (p<.0001). The Hygienic clamps changes less than the Ivory clamps. The results indicate that steam and dry heat sterilization do not affect retention of rubber-dam clamps.

Analysis of Variance↗
PubMed1996

[Rubber band ligation of hemorrhoids. A four-year experience].

The non-surgical approach to hemorrhoidal disease was considered, particularly in relation to the rubber band ligation technique. On the basis of a four-year experience collected on 60 treated patients among 75 observed, cases, indications, results and advantages of the method were outlined. Besides the classic method's applications, two cases were presented in which the technique was applied on the grounds of non typical indications. From the final results the rubber band method represents a good therapeutic option for early degrees of hemorrhoidal disease. Moreover, on the basis of the author's experience, this method is also suitable in appropriately selected cases of advanced hemorrhoidal disease intra-anal mucosal prolapse.

Adult↗
PubMed1996

[Investigation of immune response in rubber workers at high risk for cancer].

The study was concerned with immune response in the workers engaged in rubber manufacture which is a cancer hazard. A group of healthy donors were in control. The study group was divided into those free from carcinogen-protein adducts (CPA) and those who revealed them and, therefore, are considered at high risk for cancer. CPAs containing benzidine, 2-naphtylamine or 3-oxyanthranyl acid were assayed in blood serum. B- and T-immunity inhibition was shown to be present in both study sub-groups. A significant difference in immune response indices was established between the CPA-free and CPA-containing groups of the rubber workers. The latter group had relatively higher levels of IgA, IgM and globulins of immunocomplexes, and revealed inhibition of formation of antibody-forming cells to ovine erythrocytes following injection of CPA-containing blood serum into mice as well as relatively higher suppression of T-cell immunity in the workers at high risk.

Adult↗
PubMedDate not supplied

N-nitrosodibenzylamine in boneless hams processed in elastic rubber nettings.

Boneless hams processed in elastic rubber nettings contain high levels of nitrosamines in the outermost layer. The precursors of the nitrosamines are zinc dibutyl- or dibenzyldithlocarbamate used as a vulcanizing agent in the formulation of the rubber. The outermost layer from 59 commercial hams was analyzed for 11 volatile nitrosamines including N-nitrosodibutylamine (NDBA) and N-nitrosodibenzylamine (NDBzA). The principal nitrosamine, NDBzA, was detected in 32 (54%) ham samples at the 10-100 ppb range; it exceeded 100 ppb in 18 (30%) samples, with the highest at 512.2 ppb. No nitrosamine was detected in 7 of 59 ham samples. To determine the cause of the high NDBzA values, various types of unused nettings (from different manufacturers) accompanying the samples were analyzed for nitrosamines. No correlation was found between the NDBzA content of the hams and the nettings. The results suggest that the problem of nitrosamine formation in these products has not yet been resolved.

Animals↗
PubMedDate not supplied

Strategy for determining extractables from rubber packaging materials in drug products.

The migration of substances from rubber packaging materials into drug products can be significant with certain packaging materials in contact with organic solvent systems. Recommendations for testing drug products for leachables are continually evolving to address new developments. Testing packaging materials using simulated solvents is not always an acceptable protocol for the pharmaceutical industry. We describe a rational strategy for evaluation of the drug product for packaging extractables. A profile of the extractables from rubber packaging materials was made with a range of organic solvents and stress conditions to provide information on substances to target in the drug product. The drug product was evaluated to determine if the matrix would cause interferences that might inhibit detection of the found extractables. Analytical methods were selected based on these findings. The procedures were validated according to FDA guidelines. A stability program using time and storage conditions as variables provided information for acceptance criteria. This same strategy can be used on other types of pharmaceuticals and packaging materials.

Drug Packaging↗
PubMed1976

Chronic respiratory symptoms and job type within the rubber industry.

Associations between the presence of chronic respiratory symptoms and a history of working in certain production job categories within the rubber industry are presented. Environmental explanations for these associations are discussed. Particular attention is also paid to the methodologic diffculties in analyzing cross-sectional health data in relation to the mobile and environmentally varied work-histories of individual workers within the rubber industry.

Adolescent↗
PubMed1998

Allergy to tetramethylthiuram disulphide, a component of pesticides and rubber.

Since 1970 patch tests have been carried out on 39,420 consecutive patients with contact dermatitis using two rubber accelerators: dimercaptobenzothiazole (2-MBT) and tetramethylthiuram disulphide (TMTD). The second substance is also a component of pesticides. Over the years, the incidence of sensitivity to these substances was similar. But in the recent years the incidence of TMTD sensitivity began rising. This fact is explained by more frequent use of rubber gloves connected with AIDS prophylaxis. Independently of this, it was found that a part of alcoholic patients treated with disulfiram (tetraethylthiuram disulphide) showed a cross-reaction to TMTD.

Allergens↗
PubMed2001

Natural rubber latex allergy: a problem of interdisciplinary concern in medicine.

In the past 10 years, IgE-mediated allergy to natural rubber latex has become a significant health problem in industrialized countries, especially among health care workers, patients with congenital malformations, and children with a history of multiple surgical interventions. Curative treatment inducing immunological tolerance in formerly sensitized patients is experimental and not yet generally available. Therefore, it is important to be aware of the seriousness of latex allergy and to understand the risk factors leading to this allergy. Preventive measures are needed to decrease the incidence of natural rubber latex sensitization. This article gives a brief review of the current state of knowledge concerning latex allergy, including a definition of latex, epidemiological data, identified allergens, the clinical spectrum, diagnostic procedures, cross-reactions, preventive measures, the legislative background, and economics.

Allergens↗
PubMed1999

Analysis of t-butylphenol acetylene condensed resin with methyl-methine linkages in vulcanized rubber by pyrolysis-gas chromatography/mass spectrometry

Methyl-methine linkages of Novolac, a commercially available t-butylphenol acetylene condensed (TBPA) resin, have been identified by recognition of pyrolysis pathways using pyrolysis-gas chromatography/mass spectrometry (Py-GC/mS) in vulcanized rubber. The diagnostic mass spectrum of t-butylphenol with methyl-methine linkages between phenolic rings was observed at m/z 192, corresponding to 4-t-butyl-2-ethyl-6-methylphenol. Other molecular ions were observed at m/z 178, 164, and 150 in the characteristic pyrolyzates. The ion at m/z 192 in the TBPA resin was observed to be characteristic for methyl-methine linkages between the phenolic groups, and the analytical pyrolysis-GC/mS method was thus able to identify the resin at low levels in vulcanized rubber. Copyright 1999 John Wiley & Sons, Ltd.

Journal Article↗
PubMed1999

Effects of photochemically immobilized polymer coatings on protein adsorption, cell adhesion, and the foreign body reaction to silicone rubber.

Photochemical immobilization technology was utilized to covalently couple polymers to silicone rubber either at multiple points along a polymer backbone or at the endpoint of an amphiphilic chain. The coating variants then were tested in vitro and in vivo for improvement of desired responses compared to uncoated silicone rubber. All coating variants suppressed the adsorption of fibrinogen and immunoglobulin G, and most also inhibited fibroblast growth by 90-99%. None of the coating variants inhibited monocyte or neutrophil adhesion in vitro. However, the surfaces that supported the highest levels of monocyte adhesion also elicited the lowest secretion of pro-inflammatory cytokines. None of the materials elicited a strong inflammatory response or significantly (p< 0.05) reduced the thickness of the fibrous capsule when implanted subcutaneously in rats. Overall, the most passivating coating variant was an endpoint immobilized polypeptide that reduced protein adsorption, inhibited fibroblast growth by 90%, elicited low cytokine secretion from monocytes, and reduced fibrous encapsulation by 33%. In general, although some coating variants modified the adsorption of proteins and the behavior of leukocytes or fibroblasts in vitro, none abolished the development of a fibrous capsule in vivo.

Acrylic Resins↗
PubMed1981

The importance of pain, pruritus and soiling as symptoms of haemorrhoids and their response to haemorrhoidectomy or rubber band ligation.

Bowel habit, anal pain or discomfort, pruritus ani and faecal soiling have been assessed in 82 patients with uncomplicated, prolapsing haemorrhoids before and after successful treatment (improvement in rectal bleeding and haemorrhoidal prolapse) by haemorrhoidectomy or rubber band ligation. An age and sex-matched control group of patients without haemorrhoids was similarly assessed. The bowel habit of the haemorrhoid group was not different from that of the control population. Pain or discomfort, pruritus and faecal soiling were much commoner in the pretreatment haemorrhoid group, compared to controls. Treatments designed to abolish rectal bleeding and prolapse (the cardinal symptoms of haemorrhoids) also reduced the incidence of these three symptoms. Only anal pain or discomfort, however, was reduced to the incidence found in the control group. Haemorrhoidectomy and rubber band ligation appeared equally effective in controlling all three symptoms. It is concluded that anal pain or discomfort, pruritus ani and faecal soiling are common symptoms of uncomplicated haemorrhoids and that they are abolished in the majority of patients by successful treatment for rectal bleeding and haemorrhoidal prolapse.

Adult↗
PubMed1977

Blood compatibility of methyl, methyl vinyl, methyl phenyl, and trifluoropropylmethylvinyl silicone rubber without silica fillers in the spiral-coiled membrane lung.

Spiral-coiled membrane lungs of 0.6 m2 surface area were fabricated from silicone rubber membranes coated with four types of commercially available pure-gum polysiloxane rubber: 1) polytrifluoropropylmethylvinylsiloxane, 2) polymethylphenylsiloxane, 3) polymethylvinylsiloxane, and 4) polydimethylsiloxane. Membranes lungs were tested in an arteriovenous shunt without added heparin after bypass was begun. All group 4 had major rise in resistance to blood flow or clotting in over 33% of the membrane lungs studied, after 6 hr of bypass. Membrane lungs with polydimethylsiloxane (group 4) had no rise in resistance to blood flow during 24 hr of bypass and had the least amount of changes in blood platelet count.

Animals↗