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COMPARATIVE ANALYSIS OF TRADITIONAL AND INDUSTRIAL PALM OIL PROCESSING METHODS ON QUALITY INDICES IN EDO STATE

CHAPTER ONE

INTRODUCTION

1.1 Background of the Study

Palm oil, extracted from the mesocarp (middle layer) of the oil palm fruit (Elaeis guineensis Jacq.) is the world’s most widely produced and consumed vegetable oil, representing about 40% of international trade in all edible oils (USDA, 2023). Nigerian economy, culture, food and nutrition are intertwined with palm oil. Nigeria ranks among the world’s five-largest producers of palm oil and Edo State  located in the Middle Belt-South transition zone  is the leading palm-oil-producing state in the country with vast smallholder plantations and cottage-scale palm oil processing centres spread over Owan, Etsako, Oredo and Uhunmwonde Local Government Areas (Falodun & Omoijiade, 2022).

Palm oil is fantastically rich in saturated and unsaturated fatty acids, where the palmitic acid (C16:0) and oleic acid (C18:1) constituents are approximately equal. More uniquely, crude palm oil is rich in carotenoids (provitamin A), tocopherols (vitamin E) and tocotrienols  powerful antioxidants that are known to help support good cardiovascular health, immune function and reduce oxidative stress (Edem, 2022). Preservation of these compounds is strongly influenced by processing techniques.

There are two major processing paradigms at play in Edo State: traditional (artisanal) processing, which employs manual or semi-mechanised methods such as fruit boiling, hand-pounding/digestion or motorised digestion, batch pressing (cages and hand-pressing) and open-air clarification; and industrial processing, which utilises continuous sterilisation, mechanical stripping, digestion drums, screw-press extraction, and centrifugal (contained) clarification. Although industrial processing generally affords higher oil yield, there remain questions as to whether the methods used sufficiently retain the quality attributes and characteristics that are hallmarks of high-value palm oil (Ehinmowo & Afolabi, 2021; Uzondu et al., 2023). A comparative study in the particular agro-industrial environment of Edo State is therefore justified, both in terms of timeliness and scientific merit.

1.2 Statement of the Problem

There are large variations in palm oil quality between different manufacturing methods used in Edo State, which affect human health, market price and export potential. Artisanal palm oil processing, while culturally and economically viable for rural farmers, is often erratic, vulnerable to contamination and yields high levels of free fatty acids (FFA) and peroxide values indicative of high lipid oxidation (Obi et al., 2022). These sub-optimal quality characteristics result from inappropriate sterilisation temperatures, excessive heating and lighting, and insufficient clarification.

On the other hand, industrial processors in Edo State, while producing more oil, have been reported to over-process oil, subjecting it to temperatures that cause thermolabile carotenoids and tocopherols to deteriorate, and compromising its nutritional quality, a major marketing appeal of Nigerian palm oil as a health-safe export product to health-conscious markets (Falodun & Omoijiade, 2022). The lack of state-specific comparative data on quality indices (FFA, peroxide value, carotenoid, moisture, iodine value and colour) collected in a systematic manner is an information gap that this study aims to fill.

1.3 Objectives of the Study

Aim:

To comparatively analyse the effects of traditional and industrial palm oil processing methods on selected quality indices in Edo State.

Specific Objectives:

1. To determine the physicochemical properties (free fatty acid content, peroxide value, iodine value, saponification value, specific gravity, and refractive index) of palm oil produced by both methods.
2. To quantify the carotenoid (provitamin A) and tocopherol (vitamin E) content of traditionally and industrially processed palm oil samples.
3. To evaluate the moisture content, colour (using the Lovibond Tintometer), and sensory attributes (colour, aroma, taste, and overall acceptability) of palm oil from both processing systems.
4. To assess the microbial quality (total viable count, mould count, and identification of indicator organisms) of palm oil from each processing method.
5. To compare the oil extraction efficiency (%) of traditional and industrial processing methods in Edo State.

1.4 Research Questions

1. What are the differences in physicochemical quality indices between traditionally and industrially processed palm oil in Edo State?
2. How do the two processing methods differ in their effects on carotenoid and tocopherol retention?
3. What are the sensory and colour differences between palm oil from traditional and industrial sources?
4. How do traditional and industrial processing methods compare in microbial contamination levels?
5. Which processing method yields higher oil extraction efficiency in the Edo State context?

1.5 Significance of the Study

This study’s results will provide a scientific basis for quality standardisation of palm oil in Edo State. This study offers a diagnostic analysis of the deficiencies in quality of traditional methods for smallholder and artisanal processors; interventions can then be targeted such as sterilisation methods or good hygiene practices. For large processors, the nutritional quality indices will be used to optimise processing.

Standards and regulatory bodies such as the Standards Organisation of Nigeria (SON) and the National Agency for Food and Drug Administration and Control (NAFDAC) will gain from new, state-level baseline data on palm oil quality to enhance compliance. The nutritional data will be relevant to health professionals and dieticians interested in the provitamin A content of edible palm oil because this is a vitamin of concern (and linked to public health issues) in Nigeria (WHO, 2022). This research also delivers on Nigeria’s goal to enhance palm oil exports for quality demands in the international market.

1.6 Scope of the Study

This research work is on palm oil produced in Edo State, Nigeria, with samples taken from three traditional processing locations in the Owan West local government area (LGA), and three industrial processing mills in the Uhunmwonde and Ikpoba-Okha LGAs. Planned to look at at least five composite samples per processing method. The indices for palm oil quality will include FFA (%), peroxide value (meq O2/kg), iodine value, saponification value, carotenoid (ppm), tocopherol (mg/100g), moisture (%), colour, microbial and sensory. This study does not consider palm kernel oil processing methods, genetic variations between different palm oil stands or cost-benefit analysis.

1.7 Definition of Terms

Free Fatty Acid (FFA) Content:

A measure of the proportion of free (unesterified) fatty acids present in oil, expressed as a percentage of palmitic acid equivalent; a key indicator of oil quality and degree of hydrolytic rancidity.

Peroxide Value (PV):

A measure of the primary oxidation products (hydroperoxides) in oil, expressed in milliequivalents of active oxygen per kilogram of oil; high values indicate early-stage oxidative deterioration.

Carotenoids:

Fat-soluble pigments responsible for the characteristic red-orange colour of crude palm oil; function as precursors to vitamin A and potent antioxidants.

Tocopherols / Tocotrienols:

Forms of vitamin E found in palm oil that function as lipid-soluble antioxidants, protecting the oil from oxidative degradation and conferring health benefits upon consumption.

Saponification Value:

The milligrams of potassium hydroxide required to saponify one gram of fat or oil; used to characterise the average molecular weight of fatty acids in the oil.

Iodine Value:

A measure of the degree of unsaturation in an oil, expressed as grams of iodine absorbed per 100 grams of oil.

Traditional Processing:

Artisanal or semi-mechanised palm oil processing methods that rely on manual labour, batch operations, and basic equipment, as practiced by smallholder processors in rural Edo State.

Industrial Processing:

Large-scale, mechanised palm oil processing employing continuous sterilisers, screw presses, and centrifugal clarifiers under standardised operational conditions.

References

Edem, D. O. (2022). Palm oil: Biochemical, physiological, nutritional, hematological, and toxicological aspects. A review. Plant Foods for Human Nutrition, 77(1), 1–14. https://doi.org/10.1007/s11130-021-00923-4

Ehinmowo, A. B., & Afolabi, O. A. (2021). Quality indices of palm oil from traditional and mechanized processing systems in South-West Nigeria. Food Science and Nutrition, 9(6), 3178–3185. https://doi.org/10.1002/fsn3.2264

Falodun, A., & Omoijiade, E. E. (2022). Palm oil production and quality assessment in Edo State, Nigeria. Bioresource Technology Reports, 17, 100915.

Obi, C. N., Egbuche, C. T., & Ibe, S. N. (2022). Comparative quality analysis of artisanal and factory-processed palm oil in southeastern Nigeria. Nigerian Journal of Agriculture, Food and Environment, 18(1), 62–71.

United States Department of Agriculture (USDA). (2023). Oilseeds: World markets and trade. Foreign Agricultural Service. https://fas.usda.gov

Uzondu, C. P., Akajiugo, C. O., & Ibeabuchi, J. C. (2023). Carotenoid retention in palm oil as influenced by processing temperature and method: A systematic review. Journal of Agricultural and Food Chemistry, 71(4), 1892–1904. https://doi.org/10.1021/acs.jafc.2c07320

World Health Organization (WHO). (2022). Vitamin and mineral nutrition information system: Vitamin A deficiency. https://www.who.int/vmnis