Study of Antioxidant Enzyme Activity and Biomarker Changes in Communities Using Charcoal Cooking in Benue State

Study of Antioxidant Enzyme Activity and Biomarker Changes in Communities Using Charcoal Cooking in Benue State

ABSTRACT

Charcoal cooking remains prevalent in many rural and semi-urban communities, exposing residents to high levels of particulate matter and other pollutants. This study investigates the biochemical impact of prolonged charcoal smoke exposure on antioxidant enzyme activities and associated biomarkers in Benue State.

A total of 120 participants from communities using charcoal for daily cooking and 60 participants from communities using cleaner energy sources were recruited. Blood samples were analyzed for antioxidant enzymes—superoxide dismutase (SOD), catalase, and glutathione peroxidase—as well as oxidative stress markers such as malondialdehyde (MDA) and total antioxidant capacity (TAC). Results revealed significantly reduced SOD and catalase activities in participants exposed to charcoal smoke, accompanied by elevated MDA levels, indicating oxidative stress. Biomarker alterations correlated with the duration of exposure and frequency of cooking.

The study emphasizes the health risks associated with charcoal smoke exposure and highlights the need for public health interventions, including cleaner cooking technologies and community awareness programs. This research provides critical insights into occupational and environmental health risks in rural Nigeria.

Keywords: Charcoal smoke, Antioxidant enzymes, Oxidative stress, Biomarkers, Benue State, Environmental health.

CHAPTER ONE

1.0 Introduction

Charcoal remains a widely used cooking fuel in many Nigerian households due to affordability and availability. However, burning charcoal releases smoke containing particulate matter, carbon monoxide, and polycyclic aromatic hydrocarbons, which may adversely affect human health. Long-term exposure to these pollutants can overwhelm the body’s antioxidant defense system, resulting in oxidative stress.

Communities in Benue State largely depend on charcoal for domestic cooking, particularly in rural areas. Chronic exposure to smoke is suspected to alter antioxidant enzyme activity and induce biochemical changes that predispose residents to cardiovascular, respiratory, and metabolic disorders. Understanding these changes is critical for developing interventions to reduce health risks.

1.1 Statement of the Problem

Although charcoal cooking is a common practice, there is limited data on its biochemical and health impacts in rural Nigerian populations. Oxidative stress caused by inhaled pollutants may lead to chronic diseases, but few studies have quantified antioxidant enzyme activity and biomarker changes in exposed communities. This lack of empirical evidence hampers effective public health planning.

1.2 Aim and Objectives of the Study

Aim: To evaluate the effects of charcoal smoke exposure on antioxidant enzyme activity and biochemical biomarkers in communities in Benue State.

Objectives:

1. To determine antioxidant enzyme activities (SOD, catalase, glutathione peroxidase) in individuals exposed to charcoal smoke.

2. To assess oxidative stress markers, including malondialdehyde (MDA) and total antioxidant capacity (TAC).

3. To examine the relationship between exposure duration and biochemical alterations.

4. To provide recommendations for reducing health risks associated with charcoal cooking.

1.3 Research Questions

1. How does charcoal smoke exposure affect antioxidant enzyme activities in residents of Benue State?

2. What are the changes in oxidative stress markers among exposed individuals?

3. Is there a correlation between exposure duration and biomarker alterations?

4. What interventions can mitigate health risks associated with charcoal smoke exposure?

1.4 Research Hypotheses

• H₀₁: Charcoal smoke exposure does not significantly affect antioxidant enzyme activities.

• H₁₁: Charcoal smoke exposure significantly affects antioxidant enzyme activities.

• H₀₂: Charcoal smoke exposure does not significantly alter oxidative stress biomarkers.

• H₁₂: Charcoal smoke exposure significantly alters oxidative stress biomarkers.

1.5 Significance of the Study

This study will inform policymakers, healthcare providers, and community leaders about the health risks associated with charcoal smoke exposure. Findings may guide interventions promoting cleaner cooking fuels, antioxidant-rich diets, and community health awareness. Additionally, it contributes to environmental and occupational health literature in Nigeria.

1.6 Scope of the Study

The research focuses on residents of selected communities in Benue State who use charcoal for domestic cooking. Blood samples and survey data will be collected to assess antioxidant enzyme activities and oxidative stress markers. The study excludes individuals with pre-existing chronic diseases that could confound biochemical measurements.

1.7 Operational Definition of Terms

• Charcoal Smoke Exposure: Regular inhalation of smoke emitted from burning charcoal for cooking.

• Antioxidant Enzymes: Enzymes such as superoxide dismutase (SOD), catalase, and glutathione peroxidase that protect cells from oxidative damage.

• Oxidative Stress Markers: Biochemical indicators, including malondialdehyde (MDA) and total antioxidant capacity (TAC), that reflect cellular oxidative damage.

• Biomarker Changes: Alterations in measurable biological indicators reflecting physiological or pathological processes.

CHAPTER TWO

2.0 Literature Review

2.1 Health Risks of Charcoal Smoke

Charcoal combustion releases particulate matter, carbon monoxide, and polycyclic aromatic hydrocarbons, which can induce oxidative stress and inflammation. According to Oloyede et al. (2020), prolonged exposure to biomass smoke reduces antioxidant enzyme activities and elevates lipid peroxidation in exposed individuals.

2.2 Antioxidant Enzymes and Oxidative Stress

Antioxidant enzymes, including SOD, catalase, and glutathione peroxidase, neutralize reactive oxygen species (ROS) and prevent cellular damage. Adeyemi et al. (2019) reported that chronic smoke exposure depletes antioxidant defense systems, increasing susceptibility to cardiovascular and respiratory conditions.

2.3 Biomarkers of Smoke-Induced Oxidative Stress

Malondialdehyde (MDA) is a key biomarker of lipid peroxidation, while total antioxidant capacity (TAC) reflects the body’s overall ability to neutralize ROS. Elevated MDA levels and reduced TAC have been linked to long-term exposure to indoor biomass smoke in rural communities (Obi et al., 2018).

2.4 Influence of Exposure Duration

The intensity and duration of exposure directly impact oxidative stress severity. Longer exposure periods to charcoal smoke have been associated with greater reductions in SOD and catalase activity, as well as higher levels of oxidative biomarkers (Onwuka et al., 2021).

2.5 Gaps in Literature

Despite widespread use of charcoal in Nigeria, there is limited biochemical assessment of affected populations. Few studies have simultaneously measured antioxidant enzyme activities, oxidative stress biomarkers, and exposure patterns in rural communities. This study addresses these gaps, providing evidence-based insights into health risks and mitigation strategies.

2.6 Summary of Literature Review

Charcoal smoke exposure poses significant health risks by altering antioxidant enzyme activities and increasing oxidative stress markers. Monitoring these biochemical changes is crucial for understanding environmental health risks in rural Nigeria. This study integrates exposure assessment with biochemical evaluation to provide a comprehensive understanding of the problem in Benue State.