This research compared two different methods of producing an industrially important enzyme using waste pomelo peels. The enzyme, called exo-polygalacturonase, has applications in food processing and textile industries. The study found that while one method (submerged fermentation) produced more enzyme, the other method (solid-state fermentation) produced a more heat-stable enzyme that could be more useful for industrial applications. Impacts on everyday life: • Demonstrates how fruit waste can be recycled into valuable industrial products • Helps make food processing and textile manufacturing more efficient and cost-effective • Contributes to more sustainable industrial practices by utilizing agricultural waste • Could lead to reduced costs for processed food and textile products • Advances the development of environmentally-friendly industrial processes