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ABSTRACT
The present study investigated the influence of spent lubricating oil (SLO) and its various fractions on the Total Antioxidant Potential (TAP), Total Phenolic Content (TPC), and Total Flavonoid Content (TFC) in Sorghum bicolor. The research aimed to understand the potential ecological and physiological implications of SLO contamination in agricultural soils. Four extracts were analyzed: water extract, water insoluble fraction extract, water-soluble fraction extract, and whole spent lubricating oil extract. Each extract exhibited distinct effects on the biochemical parameters measured. The results are presented in terms of milligrams of Gallic Acid Equivalent (GAE) per gram for TAP, milligrams of GAE per gram for TPC, and milligrams of Quercetin Equivalent (QE) per gram for TFC. The water extract displayed a TAP value of 5.00 mg GAE/g, which was significantly lower than the other extracts, indicating reduced antioxidant potential. In contrast, the water insoluble fraction extract exhibited the highest TAP value of 15.00 mg GAE/g, suggesting that this fraction possessed the most potent antioxidant properties. These findings highlight the varying impacts of SLO and its fractions on TAP, TPC, and TFC in Sorghum bicolor. The differences in these parameters among the extracts indicate that SLO contamination can have a multifaceted effect on the antioxidant and phenolic composition of this important agricultural crop. Understanding these effects is crucial for mitigating the potential harm to both the environment and human health, and for developing strategies to ensure the sustainability of Sorghum bicolor cultivation in contaminated soil.
