Synergism and molecular mismatch in rhamnolipid/CTAC catanionic surfactant mixtures

Esposito, Rodolfo; Gallucci, Noemi; Niccoli, Marcella; Cavalcanti, Leide P.; Krauss, Irene Russo; Paduano, Luigi; D’Errico, Gerardino

doi:10.1016/j.colsurfa.2023.131931

Cited by 3 publications

(1 citation statement)

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“…The cmc of Rha in buffered aqueous solution is about 0.065 mg mL −1 ; this value well agrees with those reported in the literature for the same rhamnolipid mixture [25], as well as for purified mono-and di-rhamnolipids, in water or in buffered aqueous solution at pH > pKa [22,49].…”

Section: Aggregation Behaviour Of Rhamnolipids In Water-bioethanol Mi...supporting

confidence: 91%

Surface and Aggregation Properties of Rhamnolipids in Water–Bioethanol Mixtures: A Step toward Green Formulation Design

Esposito,

Taddeo,

Russo

et al. 2024

Surfaces

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Water–ethanol mixtures are largely exploited for many different applications, from industrial processes to pharmaceutical formulations. Surfactants are often added to tune their interfacial properties. Sustainability concerns require redesigning such blends to minimize their environmental impact. A successful approach is to replace synthetic oil-based components with affordable unpurified bio-derived alternatives. In this respect, we have characterized aqueous mixtures of bioethanol, obtained by the fermentation of algae, and rhamnolipids, biosurfactants of microbial origin. The physico-chemical characterization of water–bioethanol binary mixtures in terms of refractive index, density, viscosity, and surface tension indicates that bioethanol behaves like pure ethanol with negligible effects of impurities. Analysis of tensiometric titrations shows that, at bioethanol contents higher than 20–30% bioethanol mass percent, rhamnolipid aggregation is impaired, whereas surface adsorption at the water–air interface remains poorly affected. Overall, bio-derived components can be proposed as a promising alternative to oil-derived chemicals in eco-sustainable formulations.

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Section: Aggregation Behaviour Of Rhamnolipids In Water-bioethanol Mi...supporting

confidence: 91%