When it rains, a soapy substance known as a saponin oozes from its bark. In the next few years, molecules derived from ...

Yet, one of the strongest adjuvants, an extract of the Chilean soap bark plant, is so difficult to produce that it costs several hundred million dollars per kilogram (2.2 pounds). University of ...

Quillay trees, technically known as Quillaja saponaria, are rare evergreens native to Chile that have long been used by the indigenous Mapuche people to make soap and ... from the bark of branches ...