1
|
Lehtinen OP, Nugroho RWN, Lehtimaa T, Vierros S, Hiekkataipale P, Ruokolainen J, Sammalkorpi M, Österberg M. Effect of temperature, water content and free fatty acid on reverse micelle formation of phospholipids in vegetable oil. Colloids Surf B Biointerfaces 2017; 160:355-363. [PMID: 28961543 DOI: 10.1016/j.colsurfb.2017.09.050] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 08/28/2017] [Accepted: 09/21/2017] [Indexed: 10/18/2022]
Abstract
The self-assembly of phospholipids in oil, specifically lecithin in rapeseed oil, was investigated by combining experimental and computational methods The influence of temperature, water, and free fatty acids on the onset of lecithin aggregation in the rapeseed oil was determined using the 7,7,8,8 -tetracyanoquinodimethane dye (TCNQ) solubilization method and the size and shape of the self-assembled lecithin structures were investigated by small-angle X-ray scattering and cryogenic transmission electron microscopy. In the absence of excess water in the system (0.03wt-% water in oil), stable cylindrical lecithin reverse micelles were observed above the critical micelle concentration (CMC). Comparing the aggregation response in room temperature and at 70°C revealed that CMC decreased with increasing temperature. Furthermore, already a modest amount of added water (0.3wt-% water in oil) was sufficient to induce the formation of lamellar lecithin structures, that phase separated from the oil. In low water content, oleic acid suppressed the formation of lecithin reverse micelles whereas in the presence of more water, the oleic acid stabilized the reverse micelles. Consequently, more water was needed to induce phase separation in the presence of oleic acid. Molecular dynamics simulations indicated that the stabilizing effect of oleic acid resulted from oleic acid enhancing phospholipid solubilization in the oil by forming a solvating shell around the phosphate head group. The findings showed that the response of the mixed surfactant system is a delicate interplay of the different components and variables. The significance of the observations is that multiple parameters need to be controlled for desired system response, for example towards vegetable oil purification or phospholipid based microemulsions.
Collapse
Affiliation(s)
- Olli-Pekka Lehtinen
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, 00076 Aalto, Finland
| | - Robertus Wahyu N Nugroho
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, 00076 Aalto, Finland
| | - Tuula Lehtimaa
- NESTE Oyj, Technology Centre, Kilpilahti, 06101 Porvoo, Finland
| | - Sampsa Vierros
- Department of Chemistry and Materials Science, School of Chemical Engineering, Aalto University, 00076 Aalto, Finland
| | - Panu Hiekkataipale
- Department of Applied Physics, School of Science, Aalto University, 00076 Aalto, Finland
| | - Janne Ruokolainen
- Department of Applied Physics, School of Science, Aalto University, 00076 Aalto, Finland
| | - Maria Sammalkorpi
- Department of Chemistry and Materials Science, School of Chemical Engineering, Aalto University, 00076 Aalto, Finland
| | - Monika Österberg
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, 00076 Aalto, Finland
| |
Collapse
|
2
|
Wang WT, Wang M, Zhang J, Liu H, Pan HC. Cloud point thermodynamics of paclitaxel-loaded microemulsion in the presence of glucose and NaCl. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.07.086] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
3
|
Bergeron DE. Micellar phase boundaries under the influence of ethyl alcohol. Appl Radiat Isot 2016; 109:264-269. [PMID: 26585642 PMCID: PMC4937795 DOI: 10.1016/j.apradiso.2015.11.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 11/04/2015] [Indexed: 10/22/2022]
Abstract
The Compton spectrum quenching technique is used to monitor the effect of ethyl alcohol (EtOH) additions on phase boundaries in two systems. In toluenic solutions of the nonionic surfactant, Triton X-100, EtOH shifts the boundary separating the first clear phase from the first turbid phase to higher water:surfactant ratios. In a commonly used scintillant, Ultima Gold AB, the critical micelle concentration is not shifted. The molecular interactions behind the observations and implications for liquid scintillation counting are discussed.
Collapse
Affiliation(s)
- Denis E Bergeron
- Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, USA.
| |
Collapse
|
4
|
Bergeron DE. Identification of phase boundaries in surfactant solutions via Compton spectrum quenching. J Phys Chem A 2014; 118:8563-71. [PMID: 24838094 DOI: 10.1021/jp502540n] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The critical micelle concentration and the phase boundary between isolated surfactant molecules and aggregates are probed via fluorescence spectroscopy and a Compton spectrum quenching technique for aqueous and toluenic solutions of Triton X-100 (TX-100). The internal fluorophore of TX-100 provides a convenient probe for the fluorescence measurements, and the appearance of redder bands in the fluorescence spectra and their relationship with aggregation (clustering of TX-100) phenomena is addressed. The Compton spectrum quenching approach makes use of quench indicating parameters (QIPs) commonly measured in liquid scintillation counting experiments. Phase boundaries identified by the QIP-based approach are in excellent accord with the fluorescence-based approach.
Collapse
Affiliation(s)
- Denis E Bergeron
- Radiation Physics Division, National Institute of Standards and Technology , Gaithersburg, Maryland 20899-8462, United States
| |
Collapse
|
5
|
Bergeron DE, Laureano-Pérez L. Micelle size effect on Fe-55 liquid scintillation efficiency. Appl Radiat Isot 2014; 87:282-6. [DOI: 10.1016/j.apradiso.2013.11.080] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 11/17/2013] [Indexed: 11/27/2022]
|
6
|
Dielectric relaxation behavior of ternary systems of water/toluene/Triton X-100: the effects of water and oil contents on microemulsion structure. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-3095-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
7
|
Kossert K. Measurement of wavelength-dependent refractive indices of liquid scintillation cocktails. Appl Radiat Isot 2013; 82:382-8. [PMID: 24185505 DOI: 10.1016/j.apradiso.2013.10.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 09/28/2013] [Accepted: 10/10/2013] [Indexed: 11/17/2022]
Abstract
Refractive indices of several commercial liquid scintillation cocktails were measured by means of an automatic critical-angle dispersion refractometer in the wavelength range from 404.7 nm to 706.5 nm. The results are needed for various applications. In particular, detailed Monte Carlo simulations of liquid scintillation counters that include the computation of optical light require these data. In addition, the refractive index is an important parameter for studies of micelle sizes by means of dynamic light scattering. In this work, the refractive indices were determined for Ultima Gold™, Ultima Gold™ F, Ultima Gold™ LLT, Ultima Gold™ AB, Hionic Fluor™, Permafluor(®)E+, Mineral Oil Scintillator, Insta-Gel Plus, OptiPhase HiSafe 2, OptiPhase HiSafe 3, Ultima Gold™ XR, Insta-Gel Plus, AquaLight, MaxiLight and Ultima Gold™ MV at 16°C, 18°C, 20°C and 22°C. The carbon dioxide absorber Carbo-Sorb(®)E was also analyzed. For some scintillators, various batches were compared and mixtures with water or nitromethane were studied.
Collapse
Affiliation(s)
- Karsten Kossert
- Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany.
| |
Collapse
|
8
|
Amphiphilic behavior of two phosphonium based ionic liquids. J Colloid Interface Sci 2013; 395:135-44. [DOI: 10.1016/j.jcis.2012.11.064] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Revised: 11/27/2012] [Accepted: 11/28/2012] [Indexed: 11/20/2022]
|
9
|
Cieśla J, Bieganowski A, Narkiewicz-Michałek J, Szymula M. Use of a Dynamic Light Scattering Technique for SDS/Water/Pentanol Studies. J DISPER SCI TECHNOL 2013. [DOI: 10.1080/01932691.2012.680834] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
10
|
Bergeron DE. Determination of micelle size in some commercial liquid scintillation cocktails. Appl Radiat Isot 2012; 70:2164-9. [PMID: 22417697 DOI: 10.1016/j.apradiso.2012.02.089] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Accepted: 02/20/2012] [Indexed: 11/28/2022]
Affiliation(s)
- Denis E Bergeron
- Physical Measurements Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8462, USA.
| |
Collapse
|
11
|
Li X, He G, Liu D, Wang M, Xiao G. Effects of Additives on Water Solubilization Capacity and Intermicellar Interaction in Heptane/Hexanol/Tritonx-100/Water Microemulsion. J DISPER SCI TECHNOL 2011. [DOI: 10.1080/01932691003662431] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
12
|
Li X, He G, Zheng W, Xiao G. Study on conductivity property and microstructure of TritonX-100/alkanol/n-heptane/water microemulsion. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.02.026] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
13
|
Kossert K, Carles AG. Improved method for the calculation of the counting efficiency of electron-capture nuclides in liquid scintillation samples. Appl Radiat Isot 2009; 68:1482-8. [PMID: 20022256 DOI: 10.1016/j.apradiso.2009.11.048] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The methods to compute the counting efficiency of electron-capture nuclides in liquid scintillation counting have been improved in several previous studies. The main improvements comprise a more realistic treatment of the ejection of photoelectrons and subsequent rearrangement processes in the atomic shell as well as a more detailed atomic rearrangement model. The latter was realized in the MICELLE code by means of a new stochastic approach. This new model was also developed to account for energy deposits within micelles. The recent improvements have now been combined in an updated version of the MICELLE code, which also makes the computation of the counting efficiency of complex decay schemes possible. In this paper, we describe and discuss recent extensions and improvements of the models and further corrections. The calculated counting efficiencies of selected radionuclides are compared with the experimental data obtained by liquid scintillation counting. For the measurements, we use standard solutions, which were calibrated by other methods.
Collapse
Affiliation(s)
- K Kossert
- Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany.
| | | |
Collapse
|
14
|
Dutt GB. Do ionic and hydrophobic probes sense similar microenvironment in Triton X-100 nonionic reverse micelles? J Chem Phys 2008; 129:014501. [DOI: 10.1063/1.2946705] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
15
|
|
16
|
A concise review of dynamical processes in polymorphic environments of a block copolymer: Rotational diffusion and photoisomerization. J CHEM SCI 2007. [DOI: 10.1007/s12039-007-0022-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
17
|
Mali KS, Dutt GB, Mukherjee T. Photoisomerization of a carbocyanine derivative in the reverse phases of a block copolymer: evidence for the existence of water droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:6837-42. [PMID: 16863228 DOI: 10.1021/la0608821] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
In an attempt to understand the nature of water present in the reverse phases of aggregates formed with the triblock copolymer poly(ethylene oxide)(20)-poly(propylene oxide)(70)-poly(ethylene oxide)(20) (P123) and also investigate how these confined environments influence the rates of photoisomerization, fluorescence lifetimes and quantum yields of a carbocyanine derivative--3,3'-diethyloxadicarbocyanine iodide (DODCI)--were measured in these systems over the temperature range of 293-318 K. Three different copolymer-oil-water compositions were chosen such that the mole ratio of water to copolymer (W) spans the range of 50-150. In these systems, butyl acetate was used as the oil or the nonpolar component. It has been noticed that in all three systems the fluorescence decays of DODCI comprise a long component whose contribution is 85-90%, and this has been ascribed to the fraction of solute solubilized in the core region where hydrated poly(ethylene oxide) units are present. A short-decay component is associated with the remaining fraction, and its values match with those measured in water, indicating that the water present in these reverse phases is in the form of droplets. The photoisomerization rate constants of DODCI located in the core regions of the reverse phases are identical in the three systems at a given temperature and similar to the ones obtained in normal phases of P123. The reasons for the observed behavior have been discussed.
Collapse
Affiliation(s)
- K S Mali
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | | | | |
Collapse
|
18
|
Dutt GB. Does the Onset of Water Droplet Formation Alter the Microenvironment of the Hydrophobic Probes Solubilized in Nonionic Reverse Micelles? J Phys Chem B 2004. [DOI: 10.1021/jp049160d] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- G. B. Dutt
- Radiation Chemistry and Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| |
Collapse
|
19
|
Park BY, Jung KS, Yu SC, Choi HS. Spectroscopic Study on Three States of Water in the Reverse Micelle Using Methylene Blue as a Probe. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2003. [DOI: 10.5012/jkcs.2003.47.4.309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
20
|
Orlich B, Schomäcker R. Enzyme catalysis in reverse micelles. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2002; 75:185-208. [PMID: 11783840 DOI: 10.1007/3-540-44604-4_6] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Water in oil microemulsions with reverse micelles provide an interesting alternative to normal organic solvents in enzyme catalysis with hydrophobic substrates. Reverse micelles are useful microreactors because they can host proteins like enzymes. Catalytic reactions with water insoluble substrates can occur at the large internal water-oil interface inside the microemulsion. The activity and stability of biomolecules can be controlled, mainly by the concentration of water in these media. With the exact knowledge of the phase behaviour and the corresponding activity of enzymes the application of these media can lead to favourable effects compared to aqueous systems, like hyperactivity or increased stability of the enzymes.
Collapse
|
21
|
Andrade SM, Costa SM, Pansu R. STRUCTURAL CHANGES IN W/O TRITON X-100/Cyclohexane-Hexanol/Water Microemulsions Probed by a Fluorescent Drug Piroxicam. J Colloid Interface Sci 2000. [DOI: 10.1006/jcis.2000.6821] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|