Data/hora: 11/06/2024 01:25:36

Provedor de dados: 	60	
País: 	Brazil	
Título: 	Evaluation of foam properties of saponin from Ilex paraguariensis A. St. Hil. (Aquifoliaceae) fruits	
Autores: 	Canto,Gizele Scotti do; Treter,Janine; Yang,Samanta; Borré,Gustavo Luís; Peixoto,Maria Paula Garofo; Ortega,George González.	
Data: 	2010-06-01	
Ano: 	2010	
Palavras-chave: 	Ilex paraguariensis; Aquifoliaceae; Mate; Saponins; Surfactants; Foam; Assay.	
Resumo: 	Saponins are natural compounds able to form abundant foam, a desirable quality required in some chemical, foods, cosmetic and pharmaceutical processes. Ilex paraguariensis A. St. Hil. (Aquifoliaceae) known as mate, is a South American widely cultivated specie due to the preparation of a tea-like beverage from its leaves. Moreover, its green fruits are a rich source of non-toxic and very low haemolytic saponins. In this study, mate saponin fraction (MSF) was evaluated as a foam former, focusing on its foamability, foam lifetime, and film drainage in the presence of different electrolytes (ionic strength I = 0.024 M). Sodium dodecyl sulphate (SDS) and polysorbate 80 (Poly-80) were used as reference surfactants. The critical micelle concentration (CMC), the minimum attainable surface tension (γCMC), surface excess concentration (Γ) and cross-section molecular surface (A) values of MSF were comparable to those of Poly-80. The foamability of MSF and both reference surfactants was equivalent. The addition of MgCl2 resulted in a negative effect on MSF foamability. The salts NaCl, KBr, and KNO3 exhibited a negative influence on MSF foam lifetime. Similar behavior was observed for MSF film drainage (order of activity: Na2HPO4 &gt; MgCl2 ≈ NaCl ≈ KNO3 &gt; KBr), where a primary fast film drainage rate was followed by film thinning stabilization after around 5 min. The behavior described above seems to be uncorrelated to the solutions' zeta potential.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502010000200010	
Editor: 	Universidade de São Paulo, Faculdade de Ciências Farmacêuticas	
Relação: 	10.1590/S1984-82502010000200010	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Pharmaceutical Sciences  v.46 n.2 2010	
Fonte: 	info:eu-repo/semantics/openAccess