Biomarkers of Benzene Exposure in Inner City Residents
2006年3月22日 更新者:National Institute of Environmental Health Sciences (NIEHS)
This study compares air pollution exposures of residents in a South Baltimore community next to major industry with those in a comparison community with much less industry nearby.
Parents and children as well as adults alone will be included.
Air levels of 3 chemicals that have been found in increased amounts in the community as well as two urinary breakdown products of benzene will be measured.
Participants will limit the amount of sorbate preserved foods they eat as this preservative interferes with one of the benzene breakdown products.
Benzene air and urine exposure measurements will be compared in each community as well as between communities.
By including children and parents we will gather exposure information on children who may be more sensitive that adults to these types of pollution.
Lastly, by restricting the amount of food preserved with sorbates, we can decide if this improves the use of ttMA for people exposed to benzene from air pollution.
研究概览
详细说明
The current study focuses on an environmental exposure assessment of a South Baltimore community residing near a heavily industrialized area.
Exposure differences between this community and a reference community that is demographically similar to South Baltimore but has limited industrial impact will be assessed.
Participants will include both parent child study pairs and adults.
Outdoor, indoor and personal 72 hour badge monitoring for benzene, 1,3-butadiene and carbon tetrachloride will be performed.
Two urinary biomarkers for benzene exposure, trans,trans-muconic acid (ttMA) and s-phenylmercapturic acid (S-PMA) will be measured at 3 daily time points over the 3 day period.
Past work indicates that ingestion of sorbate preserved foods causes substantial interference with the benzene biomarker, ttMA.
Therefore, participants will restrict their intake of sorbate preserved foods during the study.
On the day of greatest dietary restriction, a 24 hour benzene personal air measurement will be obtained.
Data analysis will include correlations of benzene badge exposure measurements and urinary biomarkers.
Air and biomarker benzene exposure data will be compared between communities.
Linear regression modeling will be used to determine important explanatory factors of the biomarkers.
The inclusion of parent child study pairs will also allow correlation of benzene air levels and urinary biomarkers between parents and children.
This will provide exposure information on a potentially susceptible subpopulation, e.g.
children, and allow assessment of potential for age-related differences in benzene metabolism.
Finally, we will be able to determine if dietary restriction is practical and results in greater specificity of ttMA as a benzene biomarker.
研究类型
观察性的
注册
90
联系人和位置
本节提供了进行研究的人员的详细联系信息,以及有关进行该研究的地点的信息。
学习地点
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Maryland
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Baltimore、Maryland、美国、21205
- Johns Hopkins University School of Hygiene and Public Health
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参与标准
研究人员寻找符合特定描述的人,称为资格标准。这些标准的一些例子是一个人的一般健康状况或先前的治疗。
资格标准
适合学习的年龄
3年 及以上 (孩子、成人、年长者)
接受健康志愿者
不
有资格学习的性别
全部
描述
residence in one of the study communities
学习计划
本节提供研究计划的详细信息,包括研究的设计方式和研究的衡量标准。
研究是如何设计的?
设计细节
- 时间观点:横截面
合作者和调查者
在这里您可以找到参与这项研究的人员和组织。
出版物和有用的链接
负责输入研究信息的人员自愿提供这些出版物。这些可能与研究有关。
一般刊物
- Weaver VM, Buckley TJ, Groopman JD. Approaches to environmental exposure assessment in children. Environ Health Perspect. 1998 Jun;106 Suppl 3(Suppl 3):827-32. doi: 10.1289/ehp.98106827.
- Weaver VM, Davoli CT, Heller PJ, Fitzwilliam A, Peters HL, Sunyer J, Murphy SE, Goldstein GW, Groopman JD. Benzene exposure, assessed by urinary trans,trans-muconic acid, in urban children with elevated blood lead levels. Environ Health Perspect. 1996 Mar;104(3):318-23. doi: 10.1289/ehp.96104318.
- Weaver VM, Buckley T, Groopman JD. Lack of specificity of trans,trans-muconic acid as a benzene biomarker after ingestion of sorbic acid-preserved foods. Cancer Epidemiol Biomarkers Prev. 2000 Jul;9(7):749-55.
研究记录日期
这些日期跟踪向 ClinicalTrials.gov 提交研究记录和摘要结果的进度。研究记录和报告的结果由国家医学图书馆 (NLM) 审查,以确保它们在发布到公共网站之前符合特定的质量控制标准。
研究注册日期
首次提交
2001年4月16日
首先提交符合 QC 标准的
2001年4月17日
首次发布 (估计)
2001年4月18日
研究记录更新
最后更新发布 (估计)
2006年3月23日
上次提交的符合 QC 标准的更新
2006年3月22日
最后验证
2006年3月1日
更多信息
与本研究相关的术语
其他研究编号
- 7780-CP-001
此信息直接从 clinicaltrials.gov 网站检索,没有任何更改。如果您有任何更改、删除或更新研究详细信息的请求,请联系 register@clinicaltrials.gov. clinicaltrials.gov 上实施更改,我们的网站上也会自动更新.