Research Topics
| Dorothea F K RawnSummaryAffiliation: Health Canada Country: Canada Publications
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Detail Information
Publications
Anatoxin-a and its metabolites in blue-green algae food supplements from Canada and PortugalDorothea F K Rawn
Food Research Division, Food Directorate, Health Products and Food Branch, Health Canada, 2203D, 251 Sir Frederick Banting Driveway, Tunney s Pasture, Ottawa, Ontario, Canada K1A 0K9
J Food Prot 70:776-9. 2007..3 to 1.5, 0.3 to 0.8, and 0.5 to 0.8 pg on the column, respectively). Because of the higher specificity of the LC-MS-MS analysis, all tested food supplement samples were considered free of anatoxin-a and its transformation products...
Persistent organic pollutants in fish oil supplements on the Canadian market: polychlorinated biphenyls and organochlorine insecticidesDorothea F K Rawn
Sir Frederick Banting Research Centre, Tunney s Pasture, Ottawa, ON, Canada
J Food Sci 74:T14-9. 2009..Average SigmaPCB and SigmaDDT intakes were calculated to be 736 +/- 2840 ng/d and 304 +/- 948 ng/d, respectively...- Canadian Total Diet Study in 1998: pesticide levels in foods from Whitehorse, Yukon, Canada, and corresponding dietary intake estimatesD F Rawn
Food Research Division 2203D, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Tunney s Pasture, Ottawa, ON, Canada K1A 0L2
Food Addit Contam 21:232-50. 2004..No dietary intakes above the acceptable daily intakes, however, were observed for any of the 39 pesticides investigated in any age-sex category, where an acceptable daily intake has been proposed... - Evaluation of surface plasmon resonance relative to high pressure liquid chromatography for the determination of paralytic shellfish toxinsDorothea F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Sir Frederick Banting Research Centre, Tunney s Pasture, Ottawa, ON, Canada K1A 0K9
J Agric Food Chem 57:10022-31. 2009..SPR may be applicable as a screening technique, although improved antibody response to the N-1-hydroxylated PSTs is required prior to this method being safely used for routine testing... - Persistent organic pollutants in fish oil supplements on the canadian market: polychlorinated dibenzo-p-dioxins, dibenzofurans, and polybrominated diphenyl ethersD F K Rawn
Food Research Div, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada
J Food Sci 74:T31-6. 2009..Average PCDD/F and PBDE intake estimates, based on consumption of maximum supplement dose following product label recommendations, were 4.32 pg TEQ/d and 25.1 ng/d lipid, respectively... - Effects of postharvest preparation on organophosphate insecticide residues in applesDorothea F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, 2203D, Tunney s Pasture, Ottawa, ON, Canada K1A 0K9
J Agric Food Chem 56:916-21. 2008..Rinsing and peeling of apples resulted in a 74.5-97.9% reduction in OP residues, while rinsing alone lowered mean concentrations by 13.5-28.7% relative to apples that received no postharvest preparation... - Variability in captan residues in apples from a Canadian orchardDorothea F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada 2203E, Tunney s Pasture, Ottawa, ON, Canada K1A 0L2
Food Addit Contam 24:149-55. 2007..Composite samples ranged in concentration from 166 to 2620 ng g-1. The greatest uncertainty associated with the measured concentrations was due to variability among apples rather than the measurement of residue levels... - N-methyl carbamate pesticide residues in conventional and organic infant foods available on the Canadian retail market, 2001-03D F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Address Locator 2203D, Tunney s Pasture, Ottawa, ON K1A 0L2, Canada
Food Addit Contam 23:651-9. 2006..Dietary intakes of carbaryl and methomyl based on the consumption of infant foods tested ranged between 0.2-343 and 0.4-2.0 ng kg-1 body weight day-1, respectively... - Improved method for the determination of anatoxin-a and two of its metabolites in blue-green algae using liquid chromatography with fluorescence detectionDorothea F K Rawn
Health Canada, Bureau of Chemical Safety, Food Research Division, Health Products and Food Branch, Address Locator 2203D, Tunney s Pasture, Ottawa, ON, Canada, K1A 0L2
J AOAC Int 88:1741-7. 2005..The detection limits obtained for the 2 degradation products dihydroanatoxin-a and epoxyanatoxin-a in BGA extracts were similarly low (55 and 65 microg/kg, respectively)... - N-methyl carbamate concentrations and dietary intake estimates for apple and grape juices available on the retail market in CanadaD F K Rawn
Food Research Division Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, 2203D, Tunney s Pasture, Ottawa, ON, Canada, K1A 0L2
Food Addit Contam 21:555-63. 2004..Carbaryl short-term intake estimates were calculated and all were below the proposed acute reference doses... - PCB, PCDD and PCDF residues in fin and non-fin fish products from the Canadian retail market 2002Dorothea F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Ottawa, ON, Canada, K1A 0L2
Sci Total Environ 359:101-10. 2006..SigmaPCB levels were below the Canadian guideline value for PCBs in fish and fish products (2000 ng/g). Similarly, 2,3,7,8-TCDD levels in all fish products were below the Canadian guideline value (0.020 ng/g)... - Confirmation of okadaic acid, dinophysistoxin-1 and dinophysistoxin-2 in shellfish as their anthrylmethyl derivatives using UV radiationDorothea F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Sir Frederick Banting Research Centre, 2203D, Tunney s Pasture, Ottawa, Ont, Canada K1A 0L2
J Chromatogr A 1080:148-56. 2005..UV radiation is, therefore, proposed as a rapid and simple confirmation technique for these DSP in mussel samples... - Organophosphate levels in apple composites and individual apples from a treated Canadian orchardDorothea F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, 2203D Tunney s Pasture, Ottawa, ON, Canada K1A 0L2
J Agric Food Chem 54:1943-8. 2006..Variability factors ranged from 2 to 19 for all compounds observed in this study. Composite samples may not accurately reflect the extremes of exposure from consumption of single servings of apples... - The impact of production type and region on polychlorinated biphenyl (PCB), polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F) concentrations in Canadian chicken egg yolksDorothea F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Tunney s Pasture, Ottawa, ON, Canada K1A 0K9
Chemosphere 89:929-35. 2012..Median PCB dietary intake estimates based on consumption of eggs were less than 10 ng d(-1) while median PCDD/F intakes were less than 45 pg d(-1)... - Liquid chromatographic determination of the cyanobacterial toxin beta-n-methylamino-L-alanine in algae food supplements, freshwater fish, and bottled waterPeter M Scott
Bureau of Chemical Safety, Health Canada, Banting Building, AL 2203D, Ottawa, Ontario K1A 0K9, Canada
J Food Prot 72:1769-73. 2009..Recoveries of BMAA from spiked extracts of hydrolyzed protein from BGA supplements and fish ranged from 66 to 83%. The cleanup developed provides a useful method for surveying foods and supplements for BMAA and protein-bound BMAA... - Application of the QuEChERS method for the analysis of pyrethrins and pyrethroids in fish tissuesDorothea F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, 2203C, Tunney s Pasture, Ottawa, ON K1A 0K9, Canada
Anal Bioanal Chem 397:2525-31. 2010..Cypermethrin concentrations ranged from 0.3 to 6.5 ng/g in the positive samples. It was not, however, observed in any imported fish product or any other domestically produced fish product... - Impacts of cooking technique on polychlorinated biphenyl and polychlorinated dioxins/furan concentrations in fish and fish products with intake estimatesDorothea F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Ottawa, Ontario, Canada
J Agric Food Chem 61:989-97. 2013..PCB and PCDD/F changes associated with cooking generally were small (<15%), although larger mean differences (∼40%) were observed in some fish products (e.g., catfish)... - Challenges and trends in the determination of selected chemical contaminants and allergens in foodRudolf Krska
Food Research Division, Bureau of Chemical Safety, Food Directorate, Health Canada, Ottawa, ON, Canada
Anal Bioanal Chem 402:139-62. 2012..Both approaches are useful when gathering surveillance data to determine occurrence and background levels of both recognized and newly identified contaminants in foods in order to estimate human daily intake for health risk assessment... - PCDD/F and PCB concentrations in sera from the Canadian Health Measures Survey (CHMS) from 2007 to 2009Dorothea F K Rawn
Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Sir Frederick Banting Research Centre, 251 Sir Frederick Banting Driveway, Tunney s Pasture, Ottawa, ON K1A 0K9, Canada
Environ Int 47:48-55. 2012..Concentration levels and patterns observed in this study of Canadians were similar to those reported in the US and European populations...