01717naa a2200145 a 450000100080000000500110000800800410001910000190006024500730007926000090015252012910016165000260145270000180147877300750149620862152018-12-04       2018    bl uuuu     u00u1 u    #d1 aMÜLLER, L. E.  aPhysical properties of botanical surfactants.h[electronic resource]  c2018  aSome vegetal species have saponins in their composition with great potential to be used as natural surfactants in organic crops. This work aims to evaluate some surfactants physical properties of Quillaja brasiliensis and Agave angustifolia, based on different methods of preparation and concentration. The vegetal samples were prepared by drying and grinding, frozen and after chopped or use dfreshandchopped. The neutral barsoapwasusedasa positive control. The drying and grinding of samples were the preparation method that resulted in higher foam col-umnheightinbothspeciesbut Q. brasiliensis was superior to A. angustifolia in all comparisons and foam index was 2756and 1017respectively. Critical micelleconcentration of Q. brasiliensis was 0.39% with the superficial tension of 54.40 mN m?1while neutral bar soap was 0.15% with 34.96 mN m?1. Aspects such as genetic characteristics of the species, environmental conditions, and analytical methods make it difficult to compare the results with other studies, but Q. brasiliensis powder has potential to be explored as a natural surfactant in organic farming. Not only the surfactants physical properties of botanical saponins should be taken into account but also its effect on insects and diseases control when decided using them.  aQuillaja Brasiliensis1 aSCHIEDECK, G.  tScience of the Total Environmentgv. 610/611, p. 1133-1137, jan. 2018.