Congener-specific approach to human PCB concentrations by serum analysis

Area of Science:

• Environmental Health
• Toxicology
• Analytical Chemistry

Background:

• Polychlorinated biphenyls (PCBs) are persistent organic pollutants with potential health risks.
• Understanding PCB congener profiles in human populations is crucial for risk assessment.

Purpose of the Study:

• To quantify all PCB congeners in human serum samples.
• To identify key PCB congeners and their correlation with demographic and lifestyle factors.
• To evaluate potential indicator congeners for total and dioxin-like PCBs.

Main Methods:

• Human serum samples from 87 volunteers were analyzed using high-resolution gas chromatography/high-resolution mass spectrometry (HRGC/HRMS).
• Participants included a general population sample and individuals working at municipal solid waste incinerators (MSWIs).
• Statistical analyses were performed to assess correlations between PCB levels and variables like age, gender, smoking, occupation, and BMI.

Main Results:

• Mean total PCB concentration was 242.77 ng/g lipid, and dioxin-like PCBs were 18.57 ng/g lipid.
• Penta-, hexa-, and heptachlorinated biphenyls comprised over 80% of total PCBs.
• PCB153, PCB138, PCB180, PCB187, and PCB118 were the most abundant congeners, accounting for 57.3% of total PCBs.
• Serum PCB concentrations showed a significant positive correlation only with age.
• Total PCBs strongly correlated with PCB153 (r=0.93), and dioxin-like PCBs with PCB118 (r=0.98).

Conclusions:

• PCB concentrations in human serum are influenced by age.
• PCB153 and PCB118 can serve as reliable indicators for total and dioxin-like PCBs, respectively.
• This research provides valuable data for human exposure assessment and biomonitoring of PCBs.