Sapindus mukurossi, a fruit from a deciduous tree in the Sapindaceae family, is widely cultivated in Southern China. Before the advent of modern synthetic detergents, its peel was commonly used to make soap due to its high saponin content. Sapindus mukurossi, a fruit from a deciduous tree in the Sapindaceae family, is widely cultivated in Southern China. Before the advent of modern synthetic detergents, its peel was commonly used to make soap due to its high saponin content. Analytical Chemistry Materials Science Phys.org – latest science and technology news stories