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Sarker P, Su X, Rojas OJ, Khan SA. Colloidal interactions between nanochitin and surfactants: Connecting micro- and macroscopic properties by isothermal titration calorimetry and rheology. Carbohydr Polym 2024; 341:122341. [PMID: 38876727 DOI: 10.1016/j.carbpol.2024.122341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 05/22/2024] [Accepted: 05/27/2024] [Indexed: 06/16/2024]
Abstract
This study elucidates the intricate interactions between chitin nanocrystals (ChNC) and surfactants of same hydrophobic tail (C12) but different head groups types (anionic, cationic, nonionic): sodium dodecyl sulfate (SDS), dodecyltrimethylammonium bromide (DTAB), and polyoxyethylene(23)lauryl ether (Brij-35). Isothermal Titration Calorimetry (ITC) and rheology are used to study the complex ChNC-surfactant interactions in aqueous media, affected by adsorption, self-assembly and micellization. The ITC results demonstrate that the surfactant head group significantly influences the dynamics and nature of the involved phenomena. Cationic DTAB's reveal minimal interaction with ChNC, non-ionic Brij-25's interact moderately at low concentrations driven by hydrophobic effects while SDS's interacts strongly and show complex interaction patterns that fall across four distinct regimes with SDS addition. We attribute such behavior to initiate through electrostatic attraction and terminate in surfactant micelle formation on ChNC surfaces. ITC also elucidates the impact of ChNC concentration on key parameters including critical aggregation concentration (CAC) and saturation concentration (C2). Dynamic rheological analysis indicates the molecular interactions translate to non-linear variations in the elastic modulus (G') upon SDS addition mirroring that observed in ITC experiments. Such a direct correlation between molecular interactions and macroscopic rheological properties provides insights to aid in the creation of nanocomposites with tailored properties.
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Affiliation(s)
- Prottasha Sarker
- Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, United States
| | - Xiaoya Su
- Bioproducts Institute, Department of Chemical & Biological Engineering, The University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Orlando J Rojas
- Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, United States; Bioproducts Institute, Department of Chemical & Biological Engineering, The University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada; Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada; Department of Wood Science, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
| | - Saad A Khan
- Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, United States.
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2
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Site-selective and stochastic spin labelling of neutral water-soluble dietary fibers optimized for electron paramagnetic resonance spectroscopy. Carbohydr Polym 2022; 293:119724. [DOI: 10.1016/j.carbpol.2022.119724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 06/08/2022] [Accepted: 06/08/2022] [Indexed: 11/23/2022]
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3
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Atika, Singh K, Chauhan S. Study of interactions of the cationic 12–2–12 Gemini surfactant with saccharides in aqueous solution: volumetric, compressibility and viscometric analysis. TENSIDE SURFACT DET 2022. [DOI: 10.1515/tsd-2021-2379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In the present study, the interaction behaviour of 12–2–12 Gemini surfactant in aqueous saccharide solutions (lactose and maltodextrin solutions) is investigated using density, sound velocity and viscosity measurements. The density and sound velocity data were used to determine the volume and compressibility parameters. The effects of temperature and concentration/strength of the solutions on the interaction behaviour were analysed by conductivity studies over a wide temperature (293.15–313.15) K and concentration range of the saccharides as well as of the surfactant. It was found that predominantly hydrophobic interactions together with ionic/hydrophilic interactions between 12–2–12 Gemini surfactant and the saccharides maltodextrin and lactose play a role. In addition, the structural changes in the 12–2–12 Gemini solutions induced by lactose and maltodextrin were investigated by viscosity measurements. The results confirm the observations from the volume and compressibility studies. The study of the different hydrophobic/hydrophilic interactions in the Gemini surfactant-sacharide-water mixtures are very helpful to understand the structural behaviour of Gemini surfactants in the view of their biological significance.
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Affiliation(s)
- Atika
- Department of Chemistry , Himachal Pradesh University , Summer Hill , Shimla 171005 , India
| | - Kuldeep Singh
- Department of Chemistry , MCM DAV College , Kangra (H.P.) 176001 , India
| | - Suvarcha Chauhan
- Department of Chemistry , Himachal Pradesh University , Summer Hill , Shimla 171005 , India
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4
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Grządka E, Godek E, Słowik G, Kowalczuk A, Matusiak J, Maciołek U. Interactions between Nanoclay, CTAB and Linear/Star Shaped Polymers. Int J Mol Sci 2022; 23:ijms23063051. [PMID: 35328470 PMCID: PMC8955478 DOI: 10.3390/ijms23063051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/03/2022] [Accepted: 03/09/2022] [Indexed: 11/16/2022] Open
Abstract
The influence of star-shaped (PAA-SS) and linear polyacrylic acid (PAA) with different molecular weights (high—PAA-HMW and low—PAA-LMW) on the structure of the adsorption layer, adsorption amount, electrokinetic and stabilizing properties of the PAA/CTAB/nanoclay suspensions was studied. The properties of the systems containing one of these polymers, the cationic surfactant—hexadecyltrimethylammonium bromide (CTAB) and the surface-modified nanoclay (N-SM) were analyzed using the following techniques: BET, CHN, FT-IR, ED-XRF, XRD, HRTEM, UV-Vis, tensiometry and zeta potential measurements. It was proved that PAA could be used as an effective stabilizer of N-SM. Moreover, the addition of CTAB caused a significant increase in the stability of the systems but decreased the adsorption of PAA on the N-SM surface and changed the structure of the adsorption layers. The largest stability was observed in the PAA-HMW/CTAB system. The PAA polymers and PAA/CTAB complexes adsorbed, especially on the clay surface, influenced the primary distribution of the layered sheets but kept the same basal d-spacing. The adsorption of PAA and the PAA/CTAB complexes took place mainly at the plate edges and on the contact space between the sheets. The obtained results will be used for the preparation of the PAA/CTAB/nanoclay composite for water purification.
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Affiliation(s)
- Elżbieta Grządka
- Department of Radiochemistry and Environmental Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, M. Skłodowskiej-Curie 3 Sq., 20-031 Lublin, Poland;
- Correspondence:
| | - Ewelina Godek
- Department of Radiochemistry and Environmental Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, M. Skłodowskiej-Curie 3 Sq., 20-031 Lublin, Poland;
| | - Grzegorz Słowik
- Department of Chemical Technology, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, M. Skłodowskiej-Curie 3 Sq., 20-031 Lublin, Poland;
| | - Agnieszka Kowalczuk
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Skłodowskiej 34, 41-819 Zabrze, Poland;
| | - Jakub Matusiak
- Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland; or
| | - Urszula Maciołek
- Analytical Laboratory, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, M. Skłodowskiej-Curie 3 Sq., 20-031 Lublin, Poland;
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5
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Influence of Zwitterionic CAPB on Flocculation of the Aqueous Cationic Guar Gum/Glauconite Suspensions at Various pH. Int J Mol Sci 2021; 22:ijms222212157. [PMID: 34830038 PMCID: PMC8621159 DOI: 10.3390/ijms222212157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/05/2021] [Accepted: 11/08/2021] [Indexed: 11/21/2022] Open
Abstract
The influence of the pseudoamphoteric zwitterionic surfactant cocamidopropylbetaine (CAPB) on the stabilizing flocculating properties of the aqueous suspensions of glauconite (GT) with cationic guar gum (CGG) at various pH values was investigated. The following techniques were used: turbidimetry, UV-VIS spectrophotometry, tensiometry, electrophoretic mobility measurements, SEM, CHN, XRD, and FT-IR. It was established that CGG is an effective glauconite flocculant. Moreover, the most probable mechanism that is responsible for flocculation is bridge flocculation resulting from polymer adsorption on the glauconite surface. The adsorption process is caused by electrostatic interactions between the negatively charged glauconite surface and the positively charged polymer. The amount of CGG adsorption increases with the increase of the pH, which was confirmed by the adsorption and zeta potential measurements. The addition of CAPB increases the amount of the polymer adsorption due to the formation of intermolecular polymer–surfactant complexes; however, it reduces flocculation effectiveness.
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6
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Kubbutat P, Kulozik U, Dombrowski J. Influence of interfacial characteristics and dielectric properties on foam structure preservation during microwave-assisted vacuum drying of whey protein isolate-maltodextrin dispersions. J FOOD ENG 2021. [DOI: 10.1016/j.jfoodeng.2021.110691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Yu F, Chen L, Zhang X, Ma L, Wang R, Lu T, Xue C. Influence of diacetyl tartaric acid ester of monoglycerides on the properties of whey powder–maltodextrin emulsion. J FOOD PROCESS PRES 2021. [DOI: 10.1111/jfpp.15692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fanqianhui Yu
- College of Food Science and Engineering Ocean University of China Qingdao P.R. China
| | - Lipin Chen
- College of Food Science and Engineering Ocean University of China Qingdao P.R. China
| | - Xiaotong Zhang
- School of Chemical Engineering University of Birmingham Birmingham UK
| | - Lei Ma
- College of Food Science and Engineering Ocean University of China Qingdao P.R. China
| | - Ruo Wang
- Culinary Teaching and Research Office Shanghai P.R. China
| | - Tao Lu
- School of Mechanical Engineering Qingdao University of Technology Qingdao P.R. China
| | - Changhu Xue
- College of Food Science and Engineering Ocean University of China Qingdao P.R. China
- Laboratory for Marine Drugs and Bioproducts Pilot National Laboratory for Marine Science and Technology Qingdao P.R. China
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8
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Kubbutat P, Leitão L, Kulozik U. Stability of Foams in Vacuum Drying Processes. Effects of Interactions between Sugars, Proteins, and Surfactants on Foam Stability and Dried Foam Properties. Foods 2021; 10:foods10081876. [PMID: 34441652 PMCID: PMC8392398 DOI: 10.3390/foods10081876] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 08/05/2021] [Accepted: 08/11/2021] [Indexed: 01/16/2023] Open
Abstract
The hypothesis was that saccharides mediate interactions between surface-active components and that this will have an impact on foam decay during the drying process. Static light scattering was performed to determine changes in interactions between the foam stabilizer on a molecular level. Furthermore, pendant drop and oscillating drop measurements were performed to examine the surface tension and surface rheology. Foams were dried in conventional dryers as well as microwave-supported vacuum dryers. Final foam properties were determined. It was shown that the addition of sugars, often added as protective substances for sensitive organic molecules, resulted in lower repulsion between different types of surface-active components, namely polysorbate 80 and β-lactoglobulin (β-lg). Differences in impact of the types of sugars and between different types of surfactant, protein, and small molecules were observed influencing the foam decay behavior. The interfacial properties of polysorbate 80 and β-lg were influenced by the type of the used sugars. The surface elasticity of protein stabilized surfaces was higher compared to that of polysorbate stabilized systems. Protein stabilized systems remained more stable compared to polysorbate systems, which was also affected by the used saccharide. Overall, a correlation between molecular interactions and foam decay behavior was found.
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9
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Kabiriyel J, Mohan CR. "Size or mass" which plays a role? An investigation on the optical and ultrasonic properties of chitosan-lanthanide composites. Int J Biol Macromol 2021; 188:609-619. [PMID: 34389396 DOI: 10.1016/j.ijbiomac.2021.08.050] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 08/02/2021] [Accepted: 08/06/2021] [Indexed: 11/29/2022]
Abstract
In this present exploration, chitosan doped with different lanthanide oxides such as CeO2, Nd2O3, Sm2O3, Eu2O3, Gd2O3, Dy2O3 and Ho2O3 has been prepared and its optical and thermodynamical properties were studied as a function of the ion size of the lanthanide element and its atomic masses. From the refractive index measurement, the space-filling factor and polarizability have been obtained. The propagation of ultrasonic waves like ultrasonic velocity and its derived quantities such as relaxation strength (rs), adiabatic bulk modulus (Ks), acoustic impedance (Z) and adiabatic compressibility (β) have been obtained for different Chitosan-Lanthanide oxides (Ch-LnO). FTIR studies confirm the formation of different Ch-LnO. The variation of all the said properties with ion size is opposite to that of atomic mass due to lanthanide contraction. The results are presented and discussed in a detailed manner.
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Affiliation(s)
- J Kabiriyel
- Nanostructured lab, Department of Physics, The Gandhigram Rural Institute-Deemed to be University, Gandhigram 624302, Tamil Nadu, India
| | - C Raja Mohan
- Nanostructured lab, Department of Physics, The Gandhigram Rural Institute-Deemed to be University, Gandhigram 624302, Tamil Nadu, India.
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10
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Khan JM, Sen P, Malik A, Rehman MT, AlAjmi MF, Ahmed A, Alghamdi OHA, Ahmad A, Ahmed MZ, Khan RH, Anwer MK. Industrially important enzyme bovine liver catalase forms amyloid in the presence of 14-4-14 Gemini surfactant at physiological pH. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125909] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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11
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Grządka E, Matusiak J, Godek E. Alginic acid as a stabilizer of zirconia suspensions in the presence of cationic surfactants. Carbohydr Polym 2020; 246:116634. [PMID: 32747269 DOI: 10.1016/j.carbpol.2020.116634] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 06/08/2020] [Accepted: 06/10/2020] [Indexed: 11/26/2022]
Abstract
The influence of hydrocarbon (CTAB), fluorocarbon (S-106-A) and silicone (C-Si) cationic surfactants: on stability, adsorption and electrokinetic properties of the alginic acid (AA)/zirconia (ZrO2) suspensions was studied. The results obtained from the spectrophotometric measurements indicate on very high effectiveness of the surfactants in stabilization of the studied systems. This is due to the formation of multimolecular complexes between alginic acid and the surfactants. The existence of these complexes was confirmed by the surface tension and the zeta potential measurements. Presented studies also enabled the estimation of the conditions under which the complexes are effectively created and the determination of their character. These findings were also confirmed by the adsorption data. Moreover, the surface charge density measurements proved that the adsorption of AA or the AA/surfactant complexes changes the structure of the electrical double layer. The presented results may find applications in the fields of functionalized materials.
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Affiliation(s)
- E Grządka
- Department of Radiochemistry and Environmental Chemistry, Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Skłodowska University, M. Skłodowskiej - Curie 3 Sq., 20-031, Lublin, Poland.
| | - J Matusiak
- Department of Radiochemistry and Environmental Chemistry, Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Skłodowska University, M. Skłodowskiej - Curie 3 Sq., 20-031, Lublin, Poland.
| | - E Godek
- Department of Radiochemistry and Environmental Chemistry, Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Skłodowska University, M. Skłodowskiej - Curie 3 Sq., 20-031, Lublin, Poland.
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12
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Rather MA, Dar TA, Singh LR, Rather GM, Bhat MA. Structural-functional integrity of lysozyme in imidazolium based surface active ionic liquids. Int J Biol Macromol 2020; 156:271-279. [PMID: 32289404 DOI: 10.1016/j.ijbiomac.2020.04.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 04/02/2020] [Accepted: 04/04/2020] [Indexed: 10/24/2022]
Abstract
The present study was designed to explore the hydrophobicity and concentration dependence of imidazolium based surface active ionic liquids (SAILs) effects on the structural-functional integrity of proteins. Specifically, we investigated the impact of SAILs viz. 1-octyl-3-methylimidazolium dodecylbenzenesulfonate ([OMIM][DBS]) and 1-dodecyl-3-methylimidazolium dodecylbenzenesulfonate ([DDMIM][DBS]) on activity, structure and stability of lysozyme. Activity measurements revealed that, in contrast to [DDMIM][DBS] that renders lysozyme either feebly active or inactive, [OMIM][DBS] significantly enhances the lysozyme activity in the concentration range of critical aggregation concentrations (CAC) to Cs (SAIL saturation concentration of protein backbone) i.e., 0.5 mM-1.35 mM. Tensiometric results in agreement with turbidity measurements inferred significant composition and concentration dependence of the lysozyme-SAIL interactions. Spectroscopic investigations revealed that compared to destabilizing behaviour of [DDMIM][DBS], [OMIM][DBS] significantly enhances both conformational as well as thermal stability of lysozyme in the CAC to Cs concentration regime. Altogether, results obtained do indicate that [OMIM][DBS], in the concentration regime of CAC to Cs, serves as an efficient stabiliser with an ability to appreciably enhance the activity, thermal stability and overall conformational stability of lysozyme. We firmly believe that [OMIM][DBS], at least in the CAC to Cs concentration ranges, can be exploited as a promising stabiliser and activity enhancer for numerous industrially important enzymes.
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Affiliation(s)
| | - Tanveer Ali Dar
- Department of Clinical Biochemistry, University of Kashmir, Hazratbal, 190006 Srinagar, J & K, India
| | - Laishram R Singh
- Dr. B. R. Ambedkar Center for Biomedical Research, University of Delhi, New Delhi, India.
| | - Ghulam Mohammad Rather
- Department of Chemistry, Islamic University of Science and Technology (IUST), Awantipora, J & K, India
| | - Mohsin Ahmad Bhat
- Department of Chemistry, University of Kashmir, Srinagar 190006, J & K, India.
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13
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Li F, Tang X, Xu Y, Wang C, Wang Z, Li Z, Wang L. A Dual-Protein Cascade Reaction for the Regioselective Synthesis of Quinoxalines. Org Lett 2020; 22:3900-3904. [DOI: 10.1021/acs.orglett.0c01186] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fengxi Li
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130023, P. R. China
| | - Xuyong Tang
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130023, P. R. China
| | - Yaning Xu
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130023, P. R. China
| | - Chunyu Wang
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130023, P. R. China
| | - Zhi Wang
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130023, P. R. China
| | - Zhengqiang Li
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130023, P. R. China
| | - Lei Wang
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130023, P. R. China
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14
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Cationic starch as the effective flocculant of silica in the presence of different surfactants. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.116132] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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15
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Qin HB, Du YL, Zhang Y, Wang XQ, Sun ZF, Sun CY, Chen GJ, Yang LY, Li Z. Evaluation of whey protein as a natural hydrate kinetic inhibitor. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.061] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Interaction of a bile salt (sodium taurocholate) with cationic (ε-polylysine) and anionic (pectin) biopolymers under simulated gastrointestinal conditions. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2018.08.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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17
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Li S, Gou S, Zhou L, Zhang Q, Yang K, Wu Y, Guo Q. Prominent temperature-response and salt irritation from self-assemblies of polyzwitterion-sodium lauryl sulfonate. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.01.059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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18
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Frizzo CP, Bender CR, Salbego PRS, Farias CAA, Villetti MA, Martins MAP. Heteroassembly Ability of Dicationic Ionic Liquids and Neutral Active Pharmaceutical Ingredients. ACS OMEGA 2018; 3:2282-2291. [PMID: 31458529 PMCID: PMC6641490 DOI: 10.1021/acsomega.7b02097] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Accepted: 02/13/2018] [Indexed: 06/10/2023]
Abstract
Extensive investigation of interactions and aggregation properties of IL + API systems is necessary to apply ionic liquids (ILs) with different hydrophobic characteristics to drug delivery or in active pharmaceutical ingredient (API) formulations. Therefore, this study aims to investigate the heteroassembly between dicationic ILs ([BisOct(MIM)2][2X], in which X is Br or BF4, and [BisOct(BnIM)2][2Br]), both in the absence and the presence of neutral APIs (salicylic acid, ibuprofen, and paracetamol) with different functional groups. Isothermal titration calorimetry results demonstrate that IL-API associations occur at very low concentrations of IL. These results were reinforced by electrospray ionization mass spectrometry with variable collision-induced dissociation, in which the IL dication interactions with APIs were detected. The strength of the dication-API interaction was determined from E cm,1/2 data. The aggregation parameters (cac, ΔG agg °, and K) between ILs and APIs were evaluated by conductivity. The 1H NMR data showed that differences in chemical shifts provided relevant insights about interaction sites in both components.
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Affiliation(s)
- Clarissa P. Frizzo
- Núcleo
de Química de Heterociclos (NUQUIMHE), Department
of Chemistry, and Laboratório de Espectroscopia e Polímeros (LEPOL),
Department of Physics, Federal University
of Santa Maria, UFSM, 97105-900 Santa Maria, Rio
Grande do Sul, Brazil
| | - Caroline R. Bender
- Núcleo
de Química de Heterociclos (NUQUIMHE), Department
of Chemistry, and Laboratório de Espectroscopia e Polímeros (LEPOL),
Department of Physics, Federal University
of Santa Maria, UFSM, 97105-900 Santa Maria, Rio
Grande do Sul, Brazil
| | - Paulo R. S. Salbego
- Núcleo
de Química de Heterociclos (NUQUIMHE), Department
of Chemistry, and Laboratório de Espectroscopia e Polímeros (LEPOL),
Department of Physics, Federal University
of Santa Maria, UFSM, 97105-900 Santa Maria, Rio
Grande do Sul, Brazil
| | - Carla A. A. Farias
- Núcleo
de Química de Heterociclos (NUQUIMHE), Department
of Chemistry, and Laboratório de Espectroscopia e Polímeros (LEPOL),
Department of Physics, Federal University
of Santa Maria, UFSM, 97105-900 Santa Maria, Rio
Grande do Sul, Brazil
| | - Marcos A. Villetti
- Núcleo
de Química de Heterociclos (NUQUIMHE), Department
of Chemistry, and Laboratório de Espectroscopia e Polímeros (LEPOL),
Department of Physics, Federal University
of Santa Maria, UFSM, 97105-900 Santa Maria, Rio
Grande do Sul, Brazil
| | - Marcos A. P. Martins
- Núcleo
de Química de Heterociclos (NUQUIMHE), Department
of Chemistry, and Laboratório de Espectroscopia e Polímeros (LEPOL),
Department of Physics, Federal University
of Santa Maria, UFSM, 97105-900 Santa Maria, Rio
Grande do Sul, Brazil
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19
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The effect of the presence of Sodium bis-(2-ethylhexyl) sulfosuccinate (AOT) on the interactions between Sodium dodecyl sulfate (SDS) and protein papain. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.10.083] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Ultrasonic velocimetry studies on different salts of chitosan: Effect of ion size. Int J Biol Macromol 2017; 104:1596-1603. [DOI: 10.1016/j.ijbiomac.2017.02.049] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 01/30/2017] [Accepted: 02/10/2017] [Indexed: 11/17/2022]
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21
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Physicochemical study of the interaction of lysozyme with surface active ionic liquid 1-butyl-3-methylimidazolium octylsulfate [BMIM] [OS] in aqueous and buffer media. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.07.052] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Ali MS, Al-Lohedan HA. Biophysical characterization of the interaction between human serum albumin and n-dodecyl β-d-maltoside: A multi-technique approach. Colloids Surf B Biointerfaces 2015. [DOI: 10.1016/j.colsurfb.2015.06.062] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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23
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Matsuura T, Ogawa A, Tomabechi M, Matsushita R, Gohtani S, Neoh TL, Yoshii H. Effect of dextrose equivalent of maltodextrin on the stability of emulsified coconut-oil in spray-dried powder. J FOOD ENG 2015. [DOI: 10.1016/j.jfoodeng.2015.04.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Jurado-Alameda E, Herrera-Márquez O, Martínez-Gallegos JF, Vicaria JM. Starch-soiled stainless steel cleaning using surfactants and α-amylase. J FOOD ENG 2015. [DOI: 10.1016/j.jfoodeng.2015.03.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Khan A, Siddiq M. Physicochemical Investigation of the Micellar Behavior of a Diblock (PEO)62-b-(PBO)33Copolymer in Water and its Interaction with Ionic Surfactants. J DISPER SCI TECHNOL 2015. [DOI: 10.1080/01932691.2015.1048460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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26
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Espinal-Ruiz M, Parada-Alfonso F, Restrepo-Sánchez LP, Narváez-Cuenca CE, McClements DJ. Interaction of a dietary fiber (pectin) with gastrointestinal components (bile salts, calcium, and lipase): a calorimetry, electrophoresis, and turbidity study. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:12620-12630. [PMID: 25479310 DOI: 10.1021/jf504829h] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
An in vitro gastrointestinal model consisting of oral, gastric, and intestinal phases was used to elucidate the impact of pectin on the digestion of emulsified lipids. Pectin reduced the extent of lipid digestion, which was attributed to its binding interactions with specific gastrointestinal components. The interaction of pectin with bile salts, lipase, CaCl2, and NaCl was therefore investigated by turbidity, microstructure, electrophoresis, and isothermal titration calorimetry (ITC) at pH 7.0 and 37 °C. ITC showed that the interaction of pectin was endothermic with bile salts, but exothermic with CaCl2, NaCl, and lipase. Electrophoresis, microstructure, and turbidity measurements showed that anionic pectin formed electrostatic complexes with calcium ions, which may have decreased lipid digestion due to increased lipid flocculation or microgel formation because this would reduce the surface area of lipid exposed to the lipase. This research provides valuable insights into the physicochemical and molecular mechanisms of the interaction of pectin with gastrointestinal components that may affect the rate and extent of lipid digestion.
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Affiliation(s)
- Mauricio Espinal-Ruiz
- Departamento de Quı́mica, Facultad de Ciencias, Universidad Nacional de Colombia , AA 14490 Bogotá, Colombia
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27
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Loeffler M, McClements DJ, McLandsborough L, Terjung N, Chang Y, Weiss J. Electrostatic interactions of cationic lauric arginate with anionic polysaccharides affect antimicrobial activity against spoilage yeasts. J Appl Microbiol 2014; 117:28-39. [PMID: 24655156 DOI: 10.1111/jam.12502] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 01/28/2014] [Accepted: 03/18/2014] [Indexed: 11/29/2022]
Abstract
AIMS To investigate the effect of anionic polysaccharides often used in beverage applications (xanthan and λ-carrageenan) on the antimicrobial efficacy of the cationic surfactant lauric arginate (LAE) against typical spoilage yeasts. METHODS AND RESULTS The antimicrobial efficacy of LAE against Saccharomyces cerevisiae, Candida albicans and Zygosaccharomyces bailii in the absence and presence of anionic polysaccharides was assessed by microtitre and macrobroth dilution assays. Combining LAE with either xanthan or λ-carrageenan caused a pronounced decrease in LAE's antimicrobial efficacy, with the minimal inhibitory and lethal concentrations (MIC and MLC) both increasing with increasing polysaccharide concentration. This reduction in antimicrobial efficacy was more pronounced for the addition of λ-carrageenan. To determine the cause of loss of activity, physical properties of solutions were examined. Turbidity and sedimentation measurements indicated that complexes between LAE and anionic polysaccharides had been formed. Electrophoresis measurements showed that complexes had varying electrical charges and dimensions depending on solution composition. CONCLUSION Results suggest that electrostatic interactions between LAE and anionic polysaccharides play a major role in complex formation and loss of antimicrobial activity. SIGNIFICANCE AND IMPACT OF THE STUDY Results have important implications for the utilization of LAE as an antimicrobial agent in beverage and food products containing anionic polysaccharides.
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Affiliation(s)
- M Loeffler
- Department of Food Physics and Meat Science, Institute of Food Science and Biotechnology, University of Hohenheim, Stuttgart, Germany
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28
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Liu Y, Yang L, Mao H, Guo R. Comparative studies on the interaction of [C4mim]Br, and [C8mim]Br with β-casein micelles. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.10.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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29
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Chauhan S, Kumar K, Singh K, Jyoti J. Volumetric, Compressibility, and Surface Tension Studies on Micellization Behavior of SDS in Aqueous Medium: Effect of Sugars. J SURFACTANTS DETERG 2013. [DOI: 10.1007/s11743-013-1532-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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30
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Rehman N, Khan A, Bibi I, Bica CID, Siddiq M. Intermolecular Interactions of Polymer/Surfactants Mixture in Aqueous Solution Investigated by Various Techniques. J DISPER SCI TECHNOL 2013. [DOI: 10.1080/01932691.2012.739940] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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31
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Peng B, Han X, Liu H, Berry RC, Tam KC. Interactions between surfactants and polymer-grafted nanocrystalline cellulose. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2012.12.059] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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32
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Chang G, He L, Zheng W, Pan A, Liu J, Li Y, Cao R. Well-defined inorganic/organic nanocomposite by nano silica core-poly(methyl methacrylate/butylacrylate/trifluoroethyl methacrylate) shell. J Colloid Interface Sci 2013; 396:129-37. [PMID: 23403111 DOI: 10.1016/j.jcis.2013.01.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Revised: 01/08/2013] [Accepted: 01/10/2013] [Indexed: 11/30/2022]
Abstract
The novel inorganic/organic core-shell SiO2/P(MMA/BA/3FMA) nanocomposite for coating application is synthesized in this paper by seed emulsion polymerization, in which the inorganic phase is composed of nano-SiO2 modified by vinyl-trimethoxysilane (VMS) or γ-methacryloxy propyl trimethoxylsilane (MPMS), and the organic phase is made of terpolymer by 2,2,2-trifluoroethyl methacrylate (3FMA), methyl methacrylate (MMA), and n-butyl acrylate (BA). The chemical structure of SiO2/P(MMA/BA/3FMA) is characterized by FTIR. The effect of surfactant polyvinylpyrrolidone (PVP), sodium dodecyl sulfate (SDS)/octyl phenyl polyoxyethylene ether (TX-10), sodium dodecyl benzene sulfonate (SDBS)/TX-10 and sodium hexametaphosphate (SHMP) on the grafting ratio (GR) of VMS and MPMS, the dispersion of nano-SiO2 particles and the film properties of SiO2/P(MMA/BA/3FMA) are investigated by TGA, DLS, TEM, SEM, and XPS. The morphology variation and the particle size distributions of SiO2/P(MMA/BA/3FMA) with the content of surfactant and P(MMA/BA/3FMA) are characterized. It is found that MPMS is more effective than VMS in improving GR and the dispersion of nano-SiO2 particles. The surfactants are favor of gaining the higher GR in the multilayer grafted nano-SiO2, especially SDS/TX-10 for 17.6% GR. The morphology of SiO2/P(MMA/BA/3FMA) is controlled by the amount of SDS/TX-10 and P(MMA/BA/3FMA) as the core-shell particles, the stacked pomegranate seed with multicore and the multicore-single shell structure when w(MMA)/w(BA)/w(3FMA)=1.3/1/1. Among the different surfactants, SDBS/TX-10 and PVP could give the monodispersing nano-SiO2 in the terpolymer matrix of the films, but SDS/TX-10 and SDBS/TX-10 could perform the fluorine-rich surface.
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Affiliation(s)
- Gang Chang
- Xi'an Jiaotong University, School of Science, Xi'an 710049, China
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33
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Wang X, Liu J, Sun L, Yu L, Jiao J, Wang R. Interaction of Bovine Serum Albumin with Ester-Functionalized Anionic Surface-Active Ionic Liquids in Aqueous Solution: A Detailed Physicochemical and Conformational Study. J Phys Chem B 2012; 116:12479-88. [DOI: 10.1021/jp307516a] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Xiaoqing Wang
- Key Laboratory of Colloid and
Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, People's Republic of China
| | - Jie Liu
- Department of Chemistry, Liaocheng University, Liaocheng 252059, People's Republic
of China
| | - Limei Sun
- Working Station
for Postdoctoral
Scientific Research in Shengli Oil Field, Dongying, 257002, People's
Republic of China
| | - Li Yu
- Key Laboratory of Colloid and
Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, People's Republic of China
| | - Jingjing Jiao
- Key Laboratory of Colloid and
Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, People's Republic of China
| | - Rui Wang
- Key Laboratory of Colloid and
Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, People's Republic of China
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34
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Kessler A, Zeeb B, Kranz B, Menéndez-Aguirre O, Fischer L, Hinrichs J, Weiss J. Isothermal titration calorimetry as a tool to determine the thermodynamics of demicellization processes. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:105104. [PMID: 23126801 DOI: 10.1063/1.4754718] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Demicellization of a 90 mM sodium dodecyl sulfate (SDS) solution in water at 10, 22, and 30 °C was studied by isothermal titration calorimetry (ITC). ΔH of the demicellization process was strongly temperature dependent, having an exothermic progression (-20.4 ± 0.9 kJ∕mol, max) at 10 °C and an endothermic one (3.7 ± 1.2 kJ∕mol, max) at 30 °C. ΔH for micelle dilution followed a slightly endothermic progression (0.9 ± 0.5 kJ∕mol at 30 °C, 0.7 ± 1.3 kJ∕mol at 22 °C, and 0.0 ± 0.5 kJ∕mol at 10 °C) at all studied temperatures. No differences in ΔH for micelle dilution and demicellization was observed at 22 °C. The temperature dependence of ΔH measured by ITC could be related to hydrophobic interactions. Therefore, ITC was shown to be a useful tool to describe the thermodynamics of demicellization processes and in addition to determine alterations in ΔH caused by changes in hydrophobic and steric∕electrostatic interactions.
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Affiliation(s)
- Anne Kessler
- Department of Food Physics and Meat Science, Institute of Food Science and Biotechnology, University of Hohenheim, Garbenstr. 25, 70599 Stuttgart, Germany
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35
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Matalanis A, Jones OG, McClements DJ. Structured biopolymer-based delivery systems for encapsulation, protection, and release of lipophilic compounds. Food Hydrocoll 2011. [DOI: 10.1016/j.foodhyd.2011.04.014] [Citation(s) in RCA: 368] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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36
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Martínez-Gallegos JF, Bravo-Rodríguez V, Jurado-Alameda E, García-López AI. Polyoxyethylene alkyl and nonyl phenol ethers complexation with potato starch. Food Hydrocoll 2011. [DOI: 10.1016/j.foodhyd.2011.01.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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37
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Mir MA, Khan JM, Khan RH, Rather GM, Dar AA. Effect of spacer length of alkanediyl-α,ω-bis(dimethylcetylammonium bromide) gemini homologues on the interfacial and physicochemical properties of BSA. Colloids Surf B Biointerfaces 2010; 77:54-9. [DOI: 10.1016/j.colsurfb.2010.01.005] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2009] [Revised: 01/04/2010] [Accepted: 01/07/2010] [Indexed: 10/20/2022]
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38
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Interaction of bovine serum albumin and long-chain imidazolium ionic liquid measured by fluorescence spectra and surface tension. Process Biochem 2010. [DOI: 10.1016/j.procbio.2009.10.001] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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39
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Mun S, Rho SJ, Kim YR. Study of inclusion complexes of cycloamylose with surfactants by isothermal titration calorimetry. Carbohydr Polym 2009. [DOI: 10.1016/j.carbpol.2008.12.041] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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Wang Y, Guo R, Xi J. Comparative studies of interactions of hemoglobin with single-chain and with gemini surfactants. J Colloid Interface Sci 2009; 331:470-5. [DOI: 10.1016/j.jcis.2008.12.020] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2008] [Revised: 11/27/2008] [Accepted: 12/03/2008] [Indexed: 10/21/2022]
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41
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Gull N, Chodankar S, Aswal V, Sen P, Khan RH, Kabir-ud-Din. Spectroscopic studies on the interaction of cationic surfactants with bovine serum albumin. Colloids Surf B Biointerfaces 2009; 69:122-8. [DOI: 10.1016/j.colsurfb.2008.11.009] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2008] [Revised: 11/16/2008] [Accepted: 11/18/2008] [Indexed: 10/21/2022]
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42
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Gull N, Sen P, Khan RH, Kabir-ud-Din. Spectroscopic Studies on the Comparative Interaction of Cationic Single-Chain and Gemini Surfactants with Human Serum Albumin. J Biochem 2008; 145:67-77. [DOI: 10.1093/jb/mvn141] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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Formation of complexes between alkyl polyglycosides and potato starch. Colloids Surf B Biointerfaces 2008; 65:92-7. [DOI: 10.1016/j.colsurfb.2008.03.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2007] [Revised: 03/07/2008] [Accepted: 03/10/2008] [Indexed: 11/24/2022]
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44
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Grant J, Lee H, Liu RCW, Allen C. Intermolecular Interactions and Morphology of Aqueous Polymer/Surfactant Mixtures Containing Cationic Chitosan and Nonionic Sorbitan Esters. Biomacromolecules 2008; 9:2146-52. [DOI: 10.1021/bm800219m] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Justin Grant
- Departments of Pharmaceutical Sciences and Chemistry, University of Toronto, 144 College Street, Toronto, Ontario, M5S 3M2 Canada
| | - Helen Lee
- Departments of Pharmaceutical Sciences and Chemistry, University of Toronto, 144 College Street, Toronto, Ontario, M5S 3M2 Canada
| | - Roger C. W. Liu
- Departments of Pharmaceutical Sciences and Chemistry, University of Toronto, 144 College Street, Toronto, Ontario, M5S 3M2 Canada
| | - Christine Allen
- Departments of Pharmaceutical Sciences and Chemistry, University of Toronto, 144 College Street, Toronto, Ontario, M5S 3M2 Canada
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45
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Bagger HL, Hoffmann SV, Fuglsang CC, Westh P. Glycoprotein-surfactant interactions: A calorimetric and spectroscopic investigation of the phytase-SDS system. Biophys Chem 2007; 129:251-8. [PMID: 17618035 DOI: 10.1016/j.bpc.2007.06.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2007] [Revised: 06/08/2007] [Accepted: 06/10/2007] [Indexed: 11/28/2022]
Abstract
The interactions of sodium dodecyl sulfate (SDS) and two glyco-variants of the enzyme phytase from Peniophora lycii were investigated. One variant (Phy) was heavily glycosylated while the other (dgPhy) was enzymatically deglycosylated. Effects at 24 degrees C of titrating SDS to Phy and dgPhy were studied by Isothermal Titration Calorimetry (ITC) and Synchrotron Radiation Circular Dichroism (SRCD) spectroscopy. Comparisons of results for the two variants were used to elucidate glycan-surfactant interrelationships. The CD spectra suggested that both the native and the SDS-denatured states of the two variants were mutually similar, and hence that the denaturation process was structurally equivalent for the two glyco-variants. The denatured state was far from fully unfolded and probably retained a substantial content of native-like structure. Furthermore, it was found that the glycans brought about only a small increase in the resistance towards SDS induced denaturation. The SDS concentration required to denature half of the protein molecules differed less than 1 mM for the two variants. The affinity for SDS of both variants was unusually low. The amount of bound SDS (w/w) at different stages of the binding isotherm was 3-10 times lower than that reported for the most previously investigated globular proteins. Analysis of the relative affinity of the glycan and peptide moieties suggested that the carbohydrates bind much less surfactant. At saturation, glycans adsorbed about half as much SDS (in g/g) as the peptide moiety of Phy and about five times less than average proteins.
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Affiliation(s)
- Heidi L Bagger
- Dept. of Science, Systems and Models, Roskilde University, Building 18.1 P.O. Box 260, DK-4000 Roskilde, Denmark
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46
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O'Driscoll BMD, Fernandez-Martin C, Wilson RD, Knott J, Roser SJ, Edler KJ. Macroscopic, mesostructured cationic surfactant/neutral polymer films: structure and cross-linking. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:4589-98. [PMID: 17371057 DOI: 10.1021/la063004b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Mesostructured films of alkyltrimethylammonium bromides or cetylpyridinium bromide and polyethylenimines that spontaneously self-assemble at the air/water interface have been examined using a range of surface sensitive techniques. These films are unusual in that they can be micrometers thick and are relatively robust. Here we show that the films can be cross-linked and thus removed from the liquid surface where they form, as solid, mesostructured polymer-surfactant membranes. Cross-linking causes little change in the structure of the films but freezes in the metastable mesostructures, enhancing the potential of these films for future applications. Cross-linked films, dried after removal from the solution surface, retain the ordered nanoscale structure within the film. We also report grazing incidence X-ray diffraction (GID), which shows that most films display scattering consistent with 2D-hexagonal phase crystallites of rodlike surfactant micelles encased in polymer. Polymer branching makes little difference to the film structures; however, polymer molecular weight has a significant effect. Films with lower polymer MW are generally thinner and more ordered, while higher polymer MW films were thicker and less ordered. Increased pH causes formation of thicker films and improves the ordering in low MW films, while high MW films lose order. To rationalize these results, we propose a model for the film formation process that relates the kinetic and thermodynamic limits of phase separation and mesophase ordering to the structures observed.
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47
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Wangsakan A, Chinachoti P, McClements DJ. Isothermal titration calorimetry study of the influence of temperature, pH and salt on maltodextrin–anionic surfactant interactions. Food Hydrocoll 2006. [DOI: 10.1016/j.foodhyd.2005.03.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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48
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Li Y, Wang X, Wang Y. Comparative Studies on Interactions of Bovine Serum Albumin with Cationic Gemini and Single-Chain Surfactants. J Phys Chem B 2006; 110:8499-505. [PMID: 16623537 DOI: 10.1021/jp060532n] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The interactions of bovine serum albumin (BSA) with cationic gemini surfactants alkanediyl-alpha,omega-bis(dodecyldimethylammonium bromide) [C12H25(CH3)2N(CH2)(S)N(CH3)2C12H25]Br2 (designated as C12C(S)C12Br2, S = 3, 6, and 12) and single-chain surfactant dodecyltrimethylammonium bromide (DTAB) have been studied with isothermal titration microcalorimetry, turbidity, fluorescence spectroscopy, and circular dichroism at pH 7.0. Comparing with DTAB, C12C(S)C12Br2 have much stronger binding ability with BSA to induce the denaturation of BSA at very low molar ratio of C12C(S)C12Br2/BSA, and C12C(S)C12Br2 have a much stronger tendency to form insoluble complexes with BSA. The binding of C12C(S)C12Br2 to BSA generates larger endothermic peaks. The first endothermic peak is much stronger than that of the second endothermic peak. The double charges and strong hydrophobicity of the gemini surfactants are the main reasons for these observations. In addition, the spectra results show that the binding of DTAB to BSA only promotes BSA unfolding and aggregation, whereas the secondary structure of BSA is possibly stabilized by a small amount of C12C(S)C12Br2 , even if the small amount of binding C12C(S)C12Br2 could induce the loss of the tertiary structure of BSA. This result may be related to the double tails of gemini surfactants, which may generate the hydrophobic linkages between the nonpolar residues of BSA.
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Affiliation(s)
- Yajuan Li
- Key Laboratory of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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49
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Xu Y, De Marco R, Shvarev A, Bakker E. Reversible electrochemical monitoring of surface confined reactions at liquid-liquid interfaces by modulation of ion transfer fluxes. Chem Commun (Camb) 2005:3074-6. [PMID: 15959589 DOI: 10.1039/b503548a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The adsorption of the neutral surfactant Brij35 at a liquid-liquid interface is reversibly monitored via its disturbance of an electrochemically imposed ion flux across the interface, forming a promising experimental tool for the detection of surface confined reactions at such liquids and polymers.
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Affiliation(s)
- Yida Xu
- Department of Chemistry and Biochemistry, Auburn University, Auburn, AL 36849, USA
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