Baraka Kichonge

1 Introduction The shift towards sustainable energy sources has led to the rapid adoption of solar microgrids, which provide localized, renewable power generation for communities, industries, and remote areas [1].

1 INTRODUCTION Vaccine demand has increased dramatically in Africa recently.1, 2 Vaccines are temperature sensitive3 and must be kept in a cold chain between +2°C and +8°C4, 5 to remain potent.

Growing concerns about energy security and environmental sustainability have fueled demand for sustainable and renewable energy sources in recent years. Biodiesel, a renewable alternative to conventional fuels, has gained significant attention as a potential source of energy. However, the stability of biodiesel during storage and its susceptibility to oxidation remain major challenges. To address these issues, researchers have turned their focus to the utilization of natural antioxidants.