Analysis shows high detection accuracy of PAHs in food samples — Evidence Review

A new study from Seoul National University of Science and Technology demonstrates that a streamlined QuEChERS method enables rapid, accurate detection of polycyclic aromatic hydrocarbons (PAHs) in various foods. Related research generally supports the need for improved, practical PAH testing methods to better assess environmental and dietary cancer risks, aligning with these findings from the original study and highlighting the importance of sensitive, routine contaminant monitoring.

• The new study’s findings are consistent with broader evidence that PAHs are widespread environmental contaminants with potential health risks, and that robust measurement methods are required for exposure assessment and risk management 1 2 4 5 15.
• Recent literature underscores that PAH exposure is linked to increased cancer risk, particularly among adults, and that both environmental and food sources contribute to overall exposure; this supports the study’s focus on food safety and routine monitoring 1 2 4 5.
• The development and validation of practical, less hazardous testing methods like QuEChERS not only improves laboratory safety and efficiency but also aligns with broader calls for more sustainable and scalable analytical approaches in public health and environmental monitoring 3 5.

Study Overview and Key Findings

Polycyclic aromatic hydrocarbons (PAHs) are chemical contaminants that can form during high-temperature food processing and are recognized for their carcinogenic potential. Detecting PAHs in food is a critical but technically demanding task, as traditional methods are labor-intensive and often require hazardous chemicals. Against this backdrop, the new study from Seoul National University of Science and Technology, led by Professor Joon-Goo Lee, explores a modified QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) method for PAH detection in food, aiming to simplify analysis and improve both efficiency and accuracy.

The research is significant because it demonstrates that QuEChERS-based sample preparation, validated across diverse food matrices, can reliably quantify eight key PAHs at low detection limits, with strong recovery rates and precision. The study also finds that certain foods, such as oils and meats, may carry higher PAH burdens, pointing to the importance of food-specific safety monitoring.

Property	Value
Study Year	2025
Organization	Department of Food Science and Biotechnology, Seoul National University of Science and Technology
Journal Name	Food Science and Biotechnology
Authors	Joon-Goo Lee
Population	Food samples
Outcome	Detection of PAHs in food samples
Results	Calibration curves for PAHs had R2 values above 0.99.

Literature Review: Related Studies

To contextualize these findings, we searched the Consensus database, which includes over 200 million research papers. The following search queries were used to identify relevant literature:

1. PAHs cancer risk assessment
2. calibration curves R2 values
3. environmental pollutants cancer mechanisms

Below is a summary table grouping key findings from related studies by major topic:

Topic	Key Findings
What are the health risks of PAH exposure from environmental and food sources?	- Adults face a significant cancer risk from environmental PAHs; ingestion, inhalation, and dermal contact are relevant exposure pathways 1 2 5. - Food, air, and dust can all contribute to total PAH exposure and potential health risks 2 5 15.
How do PAHs and environmental pollutants promote cancer development?	- PAHs and other pollutants can promote cancer by causing DNA damage, affecting gene regulation, and acting as tumor promoters, particularly when combined with pre-existing mutations 11 12 13 14 15. - Carcinogenic potential varies by pollutant type, dose, and exposure route 2 14 15.
What are the challenges and advances in PAH detection and measurement?	- Conventional PAH detection methods can be labor-intensive and variable in accuracy; improved calibration and streamlined sample preparation are needed for reliable risk assessment 6 7 8 9 10. - Newer methods, like QuEChERS, offer better efficiency, accuracy, and less chemical waste 6 10.
Which sources and food types are most associated with high PAH contamination?	- Biomass combustion, diesel emissions, and certain cooking processes (grilling, smoking) are significant sources of PAHs in the environment and food 3 4 5. - Oils, meats, and smoked foods often show higher PAH levels compared to cereals and processed products 4 5.

What are the health risks of PAH exposure from environmental and food sources?

Research consistently shows that PAH exposure, whether from environmental sources or food, is associated with an increased risk of cancer, especially in adults. While environmental monitoring has traditionally focused on air and occupational exposures, recent work emphasizes the need to account for dietary intake, indoor air, and dust as part of a comprehensive exposure assessment.

• Adults are at higher risk of cancer from PAH exposure than children or infants, with ingestion, inhalation, and dermal pathways all contributing to overall risk 1 5.
• Food and environmental sources (air, dust, water) must be considered together when assessing total PAH exposure and health risk 2 5.
• Health-based guidelines, such as those for benzo[a]pyrene, help contextualize measured PAH concentrations with respect to potential cancer risk 2.
• The new study's focus on rapid and routine measurement of food PAHs addresses a key gap in risk assessment by enabling better dietary exposure monitoring 1 2 5 15.

How do PAHs and environmental pollutants promote cancer development?

Multiple studies have explored the molecular and cellular mechanisms by which PAHs and other environmental pollutants contribute to cancer risk. PAHs can cause DNA damage, epigenetic modifications, and act as tumor promoters, particularly when pre-existing oncogenic mutations are present.

• PAHs can induce DNA adducts, oxidative stress, and gene expression changes that promote tumor development 12 13 14.
• At low environmental exposures, tumor promotion may be the dominant mechanism, while at high exposures (such as occupational or smoking), direct genotoxicity is more important 14.
• Environmental pollutants impact not only cancer risk but also cancer progression and drug resistance in established tumors 13.
• The importance of accurate, sensitive monitoring of PAHs in food and environment is underscored by these mechanistic insights 11 12 13 14 15.

What are the challenges and advances in PAH detection and measurement?

Accurate detection and quantification of PAHs remain technically challenging. Traditional laboratory methods can be time-consuming and require hazardous chemicals. Advances in calibration, sample preparation, and analytical techniques—such as the QuEChERS method validated in the new study—are critical for improving reliability and sustainability in routine testing.

• Calibration curves and high R2 values are essential for ensuring accurate quantification of PAHs in diverse sample matrices 6 7 8 9 10.
• Streamlined methods like QuEChERS reduce hands-on time, chemical use, and environmental impact, aligning with calls for greener laboratory practices 6 10.
• Differences in measurement techniques can affect risk assessment and regulation if not standardized 6 7 9.
• The new study's demonstration of strong calibration and recovery across different foods supports its broader applicability for routine safety monitoring 6 7 10.

Which sources and food types are most associated with high PAH contamination?

PAH contamination is highest in foods and environments exposed to combustion products, such as grilled meats, smoked fish, oils, and areas with significant biomass or diesel combustion. The variability of PAH levels in different food types and environments underlines the need for targeted monitoring.

• Biomass combustion and diesel emissions are major contributors to airborne PAHs, which can also deposit on foods 3 4.
• Indoor environments, especially kitchens and areas with cooking or heating, can accumulate significant PAH levels in dust and air 5.
• Food-specific differences in PAH contamination reflect variations in ingredient sources, processing methods, and environmental exposures 4 5.
• The new study's findings that oils and meats harbored the highest PAH concentrations align with existing evidence on dietary sources of concern 4 5.

Future Research Questions

While this study advances the detection and risk assessment of PAHs in food, several important questions remain. Further research is needed to refine exposure assessment, link analytical results with health outcomes, and develop effective risk reduction strategies.

Research Question	Relevance
How do different food processing methods affect PAH levels across various food types?	Understanding the influence of smoking, grilling, frying, and roasting on PAH formation in different foods can inform safer cooking practices and regulatory guidance 4 5.
What are the long-term health outcomes of chronic dietary PAH exposure?	Longitudinal studies are needed to clarify the relationship between dietary PAH intake and cancer or other chronic diseases, especially in diverse populations 1 2 15.
Can further improvements in analytical methods increase the sensitivity and specificity of PAH detection in complex food matrices?	Enhancing analytical performance could allow for even lower detection limits, reduce false positives/negatives, and expand applicability to more food types or contaminants 6 7 10.
What risk management and regulatory approaches are most effective for reducing PAH exposure from food and the environment?	Evaluating public health interventions, food processing regulations, and environmental policies will help identify best practices for minimizing population exposure to carcinogenic PAHs 2 14 15.
How do genetic and epigenetic factors modify the cancer risk associated with PAH exposure?	Investigation of gene-environment interactions and epigenetic mechanisms may reveal why some individuals or populations are more susceptible to PAH-induced disease, informing personalized risk assessment and intervention 12 13 14.