萘代谢产物-白蛋白加合物作为焦炉工接触生物标志物的初步探索

目的探讨萘代谢产物的白蛋白加合物作为焦炉工接触生物标志物的可行性。方法随机选取某焦化厂28名焦炉作业工人(接触组)和22名对照个体(对照组),工人在连续工作4d的班后采集静脉血和尿样,并使用调查表收集个人信息。采用气相色谱质谱联机方法测定血浆中白蛋白加合物。结果在接触组及对照组中均检测出1,2萘醌及1,4萘醌与白蛋白的加合物(1,2NPQAlb和1,4NPQAlb)。接触组1,2NPQAlb水平(766pmol/g)高于对照组(449pmol/g),差异有统计学意义;1,4NPQAlb水平在接触组(486pmol/g)和对照组(442pmol/g)间差异无统计学意义。接触组1,2NPQAlb水平(766pmol/g)高于1,4NPQAlb(486pmol/g),差异有显著性。尿中萘、1萘酚、2萘酚及1羟基芘浓度与1,2NPQAlb水平间呈显著相关性,而与1,4NPQAlb之间未见明显的相关关系。结论1,2NPQAlb可有效地反映个体中长期暴露于气态多环芳烃的内剂量水平,有可能作为生物标志物用于焦炉工的生物监测。

Preliminary study on naphthalene-metabolites-albumin adduct as an exposure biomarker for coke oven workers

OBJECTIVE: To study albumin adduct with naphthalene metabolites, namely 1,2-naphthoquinone (1,2-NPQ) and 1,4-naphthoquinone (1,4-NPQ), as a potential biomarker for intermediate/long-term exposure to polycyclic aromatic hydrocarbons (PAH) in coke oven workers. METHODS: Twenty-eight coke oven workers and 22 control workers were recruited from a cokery. Spot urine and venous blood samples were collected from the workers after four continuously working days and personal information was obtained by questionnaire. Plasma albumin adduct was detected with gas chromatography-mass spectrometry. RESULTS: Albumin adduct with 1,2- & 1,4-NPQ (1,2-NPQ and 1,4-NPQ), respectively, were detected in all coke oven workers and controls. Median plasma level of 1,2-NPQ-Alb in coke oven workers was significantly higher than that in controls (76.6 pmol/g vs. 44.9 pmol/g, P < 0.01). However, there was no significant difference in plasma median level of 1,4-NPQ-Alb between the two groups (48.6 pmol/g vs. 44.2 pmol/g, P > 0.05). Plasma level of 1,2-NPQ-Alb was significantly higher than that of 1,4-NPQ-Alb in coke oven workers. Urine levels of naphthalene, 1-naphthol, 2-naphthol and 1-pyrenol in coke oven workers correlated significantly with their plasma level of 1,2-NPQ-Alb (Pearson coefficient of correlation greater than 0.371, P < 0.01), but did not do significantly with 1,4-NPQ-Alb. CONCLUSION: Plasma level of 1,2-NPQ-Alb could effectively reflect their magnitude of personal internal dose of exposure to air PAH, so it could be used as a potential biomarker to evaluate their intermediate/long-term exposure to PAH in coke oven workers.