A recent study published in the International Journal of Biological Macromolecules highlights the potential of using sesame straw to create biochar for removing harmful substances from sesame oil. The researchers, led by Shuai Xu and colleagues, explored the effectiveness of different lignin-based biochar (LBB) in adsorbing benzo[a]pyrene (BaP), a carcinogen formed during the high-temperature roasting of sesame seeds.

The team extracted lignin from sesame oil by-products, including the straw and capsules of black and white sesame, using acid, alkali, and ethanol methods. They found that white sesame straw, particularly when processed with acid, was the most effective precursor for biochar production. The resulting biochar, referred to as WS-1LB, demonstrated an impressive 91.44% BaP removal efficiency and featured a highly porous structure, which significantly enhances its adsorption capabilities.

This study sheds light on the dual benefit of utilizing agricultural waste: not only does it provide a cost-effective and sustainable method to produce biochar, but it also helps in enhancing the safety of sesame oil by reducing carcinogenic contaminants. By focusing on the physical and chemical processes involved in BaP adsorption, the research underscores the potential of LBB as a superior alternative to traditional adsorbents, which often come with high costs and limited recyclability.

The findings present a promising solution for the sesame oil industry and contribute to broader efforts in food safety and waste management, paving the way for further innovations in biochar applications.