The researchers prepared biodiesel from karanja oil using a process called transesterification. This biodiesel is renewable, biodegradable, and safe to use as fuel. They found that using methanol and sodium hydroxide as catalysts resulted in the production of karanja oil methyl ester (KOME) and glycerol. The properties of KOME were tested and met the standards for fuel quality. Karanja oil is a good source of energy for biodiesel production due to its high oil recovery and quality.