2
|
Tucker I, Burley A, Petkova R, Hosking S, Thomas R, Penfold J, Li P, Ma K, Webster J, Welbourn R. Surfactant/biosurfactant mixing: Adsorption of saponin/nonionic surfactant mixtures at the air-water interface. J Colloid Interface Sci 2020; 574:385-392. [DOI: 10.1016/j.jcis.2020.04.061] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 04/15/2020] [Accepted: 04/15/2020] [Indexed: 10/24/2022]
|
3
|
Tucker IM, Burley A, Petkova RE, Hosking SL, Penfold J, Thomas RK, Li PX, Webster JRP, Welbourn R. Mixing Natural and Synthetic Surfactants: Co-Adsorption of Triterpenoid Saponins and Sodium Dodecyl Sulfate at the Air-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:5997-6006. [PMID: 32388992 DOI: 10.1021/acs.langmuir.0c00922] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Saponins are highly surface active glycosides, derived from a wide range of plant species. Their ability to produce stable foams and emulsions has stimulated their applications in beverages, foods, and cosmetics. To explore a wider range of potential applications, their surface mixing properties with conventional surfactants have been investigated. The competitive adsorption of the triterpenoid saponin escin with an anionic surfactant sodium dodecyl sulfate, SDS, at the air-water interface has been studied by neutron reflectivity, NR, and surface tension. The NR measurements, at concentrations above the mixed critical micelle concentration, demonstrate the impact of the relative surface activities of the two components. The surface mixing is highly nonideal and can be described quantitatively by the pseudophase approximation with the inclusion of the quadratic and cubic terms in the excess free energy of mixing. Hence, the surface mixing is highly asymmetrical and reflects both the electrostatic and steric contributions to the intermolecular interactions. The relative importance of the steric contribution is reinforced by the observation that the micelle mixing is even more nonideal than the surface mixing. The mixing properties result in the surface adsorption being largely dominated by the SDS over the composition and concentration range explored. The results and their interpretation provide an important insight into the wider potential for mixing saponins with more conventional surfactants.
Collapse
Affiliation(s)
- I M Tucker
- Unilever Research and Development, Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral CH63 3JW, U.K
| | - A Burley
- Unilever Research and Development, Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral CH63 3JW, U.K
| | - R E Petkova
- Unilever Research and Development, Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral CH63 3JW, U.K
| | - S L Hosking
- Unilever Research and Development, Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral CH63 3JW, U.K
| | - J Penfold
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, OXON, U.K
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K
| | - R K Thomas
- Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U.K
| | - P X Li
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, OXON, U.K
| | - J R P Webster
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, OXON, U.K
| | - R Welbourn
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, OXON, U.K
| |
Collapse
|
4
|
Penfold J, Thomas RK. Recent developments and applications of the thermodynamics of surfactant mixing. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1649489] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Jeffrey Penfold
- ISIS Facility, Rutherford Appleton Laboratory, STFC, Chilton, Didcot, UK
- Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, UK
| | - Robert K. Thomas
- Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, UK
| |
Collapse
|
5
|
Liley JR, Thomas RK, Penfold J, Tucker IM, Petkov JT, Stevenson P, Webster JRP. Surface Adsorption in Ternary Surfactant Mixtures above the Critical Micelle Concentration: Effects of Asymmetry on the Composition Dependence of the Excess Free Energy. J Phys Chem B 2017; 121:2825-2838. [DOI: 10.1021/acs.jpcb.7b01337] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jessica R. Liley
- Physical
and Theoretical Chemistry Laboratory, University of Oxford, South Parks
Road, Oxford OX1 3QZ, U.K
| | - Robert K. Thomas
- Physical
and Theoretical Chemistry Laboratory, University of Oxford, South Parks
Road, Oxford OX1 3QZ, U.K
| | - Jeffrey Penfold
- Physical
and Theoretical Chemistry Laboratory, University of Oxford, South Parks
Road, Oxford OX1 3QZ, U.K
- Rutherford-Appleton Laboratory, STFC, Chilton, Didcot, Oxfordshire OX11 0RA, U.K
| | - Ian M. Tucker
- Unilever Research and Development Laboratory, Port Sunlight, Quarry Road East, Bebington, Wirral CH63 3JW, U.K
| | - Jordan T. Petkov
- Unilever Research and Development Laboratory, Port Sunlight, Quarry Road East, Bebington, Wirral CH63 3JW, U.K
| | - Paul Stevenson
- Unilever Research and Development Laboratory, Port Sunlight, Quarry Road East, Bebington, Wirral CH63 3JW, U.K
| | - John R. P. Webster
- Rutherford-Appleton Laboratory, STFC, Chilton, Didcot, Oxfordshire OX11 0RA, U.K
| |
Collapse
|
6
|
Self-assembly in dilute mixtures of non-ionic and anionic surfactants and rhamnolipd biosurfactants. J Colloid Interface Sci 2017; 487:493-503. [DOI: 10.1016/j.jcis.2016.10.071] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 10/24/2016] [Accepted: 10/25/2016] [Indexed: 11/21/2022]
|