1
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Influence of low molecular weight surfactants on the stability of model infant formula emulsions based on hydrolyzed rice protein. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2021.112544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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2
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Aslam J, Hussain Lone I, Ansari F, Aslam A, Aslam R, Akram M. Molecular binding interaction of pyridinium based gemini surfactants with bovine serum albumin: Insights from physicochemical, multispectroscopic, and computational analysis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 250:119350. [PMID: 33387804 DOI: 10.1016/j.saa.2020.119350] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 12/10/2020] [Accepted: 12/16/2020] [Indexed: 06/12/2023]
Abstract
To study the interaction of the series of pyridinium based gemini surfactants (GS) (referred to as m-Py-m, m = 14, 16); 4,4'-(propane-1,3-diyl)bis(1-(2-(tetradecyloxy)-2-oxoethyl) dipyridinium chloride (14-Py-14), and 4,4'-(propane-1,3-diyl) bis(1-(2-(hexadecyloxy)-2-oxoethyl)dipyridinium chloride (16-Py-16) with bovine serum albumin (BSA), various physicochemical and spectroscopic tools such as tensiometry, steady-state fluorescence, synchronous fluorescence, pyrene fluorescence, UV-visible, far-UV circular dichroism (CD) were utilized at physiological pH (7.4) and 298 K in combination with computational molecular modeling analysis. The tensiometric results show significant modifications in interfacial and thermodynamic parameters for m-Py-m GS upon BSA combination, deciphering the gemini surfactant-BSA interaction. Steady-state fluorescence analysis evaluates the structural alterations of BSA with the addition of m-Py-m GS. The plots of Stern-Volmer, modified Stern-Volmer, and thermodynamic parameters were used to determine the binding type of m-Py-m GS to BSA. The synchronous fluorescence spectra state a mild effect of gemini surfactants on the emission intensity of tyrosine (Tyr) residues, on the other hand, tryptophan (Trp) residues showed a significant effect. Post addition of GS, the plot of pyrene fluorescence reveals the mild micropolarity fluctuations via the probe (pyrene) molecules encapsulated in BSA. UV-visible experiments support the complex formation between the BSA and m-Py-m GS. Far-UV CD measurements revealed the modifications in the secondary structure of protein produced by m-Py-m GS. Furthermore, we also used the computational molecular modeling for attaining deep insight into BSA and m-Py-m GS binding and the results are supported with our experimental results.
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Affiliation(s)
- Jeenat Aslam
- Department of Chemistry, College of Science, Yanbu-30799, Taibah University, Al-Madina, Saudi Arabia.
| | - Irfan Hussain Lone
- Department of Chemistry, College of Science, Yanbu-30799, Taibah University, Al-Madina, Saudi Arabia
| | - Farah Ansari
- Department of Chemistry, Faculty of Science, Aligarh Muslim University, Aligarh 202002, India
| | - Afroz Aslam
- Department of Chemistry, Faculty of Science, Aligarh Muslim University, Aligarh 202002, India
| | - Ruby Aslam
- Corrosion Research Laboratory, Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, India
| | - Mohd Akram
- Department of Chemistry, Faculty of Science, Aligarh Muslim University, Aligarh 202002, India.
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3
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Verma SK, Ghosh KK, Verma R, Verma S. Influence of cationic surfactants and inorganic salts on the enzyme kinetic activity of
Mucor javanicus
lipase. INT J CHEM KINET 2020. [DOI: 10.1002/kin.21444] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Santosh K. Verma
- School of Chemistry and Chemical Engineering Yulin University Yulin Shaanxi People's Republic of China
- Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization Yulin University Yulin Shaanxi People's Republic of China
- School of Studies in Chemistry Pt. Ravishankar Shukla University Raipur Chhattisgarh India
| | - Kallol K. Ghosh
- School of Studies in Chemistry Pt. Ravishankar Shukla University Raipur Chhattisgarh India
| | - Rameshwari Verma
- School of Chemistry and Chemical Engineering Yulin University Yulin Shaanxi People's Republic of China
- Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization Yulin University Yulin Shaanxi People's Republic of China
- School of Studies in Chemistry Pt. Ravishankar Shukla University Raipur Chhattisgarh India
| | - Shekhar Verma
- University College of Pharmacy Raipur Pt. Deendayal Upadhyay Memorial Health Sciences and Aayush University of Chhattisgarh Raipur India
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4
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Lipase Catalysis in Presence of Nonionic Surfactants. Appl Biochem Biotechnol 2019; 191:744-762. [DOI: 10.1007/s12010-019-03212-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Accepted: 12/05/2019] [Indexed: 02/06/2023]
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5
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Soni S, Dwivedee BP, Chand Banerjee U. Facile fabrication of a recyclable nanobiocatalyst: immobilization of Burkholderia cepacia lipase on carbon nanofibers for the kinetic resolution of a racemic atenolol intermediate. RSC Adv 2018; 8:27763-27774. [PMID: 35542692 PMCID: PMC9083555 DOI: 10.1039/c8ra05463k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 07/25/2018] [Indexed: 11/21/2022] Open
Abstract
Immobilization of surfactant treated Burkholderia cepacia lipase on the surface of carbon nanofibers was performed via two different methods: adsorption and covalent attachment. Simple adsorption of lipase on carbon nanofibers turned out to be a poor strategy, exhibiting an immobilization efficiency of 36%, while covalent coupling using 1-ethyl-3-[3-dimethylaminopropyl] carbodiimide (EDC)/N-hydroxysuccinimide (NHS) showed better immobilization efficiency (56%). The nanobioconjugate fabricated using the latter method showed an eleven-fold increase in enzyme activity towards the hydrolysis of p-nitrophenyl palmitate and enhanced dispersion in organic solvents. At 80 °C, the half-life of lipase in the nanobioconjugate was almost 20 fold higher than that of free lipase, demonstrating its thermal stability. The as-prepared nanobioconjugate was reused for nine consecutive reaction cycles achieving 100% yield in the hydrolysis of p-nitrophenol palmitate but losing almost 50% of the initial activity after seven operational cycles. Finally, this heterogeneous nanobioconjugate was more active and enantioselective [C = 47.8, eep = 97.0 and E = 194] than free lipase [C = 35.4, eep = 97.1 and E = 88] towards the kinetic resolution of a racemic intermediate of atenolol yielding the S enantiomer, which signifies its importance as a nanobiocatalyst.
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Affiliation(s)
- Surbhi Soni
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research S.A.S. Nagar 160062 Punjab India
| | - Bharat Prasad Dwivedee
- Department of Pharmaceutical Technology (Biotechnology), National Institute of Pharmaceutical Education and Research S.A.S. Nagar 160062 Punjab India
| | - Uttam Chand Banerjee
- Department of Pharmaceutical Technology (Biotechnology), National Institute of Pharmaceutical Education and Research S.A.S. Nagar 160062 Punjab India
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6
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Effect of cationic gemini surfactant and its monomeric counterpart on the conformational stability and esterase activity of human serum albumin. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.03.070] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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7
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Drapala KP, Mulvihill DM, O’Mahony JA. A review of the analytical approaches used for studying the structure, interactions and stability of emulsions in nutritional beverage systems. FOOD STRUCTURE-NETHERLANDS 2018. [DOI: 10.1016/j.foostr.2018.01.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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8
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Characterization of Thermophilic Alkaline Lipase Produced by Staphylococcus aureus Suitable for Leather and Detergent Industries. IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY TRANSACTION A-SCIENCE 2017. [DOI: 10.1007/s40995-017-0265-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Drapala KP, Auty MA, Mulvihill DM, O'Mahony JA. Performance of whey protein hydrolysate–maltodextrin conjugates as emulsifiers in model infant formula emulsions. Int Dairy J 2016. [DOI: 10.1016/j.idairyj.2016.03.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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Maurya JK, Mir MUH, Singh UK, Maurya N, Dohare N, Patel S, Ali A, Patel R. Molecular investigation of the interaction between ionic liquid type gemini surfactant and lysozyme: A spectroscopic and computational approach. Biopolymers 2015; 103:406-15. [DOI: 10.1002/bip.22647] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 03/01/2015] [Accepted: 03/02/2015] [Indexed: 01/04/2023]
Affiliation(s)
- Jitendra Kumar Maurya
- Biophysical Chemistry Laboratory; Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University); New Delhi 110025 India
| | - Muzaffar Ul Hassan Mir
- Biophysical Chemistry Laboratory; Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University); New Delhi 110025 India
| | - Upendra Kumar Singh
- Biophysical Chemistry Laboratory; Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University); New Delhi 110025 India
| | - Neha Maurya
- Biophysical Chemistry Laboratory; Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University); New Delhi 110025 India
| | - Neeraj Dohare
- Biophysical Chemistry Laboratory; Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University); New Delhi 110025 India
| | - Seema Patel
- Biophysical Chemistry Laboratory; Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University); New Delhi 110025 India
| | - Anwar Ali
- Department of Chemistry; Jamia Millia Islamia (A Central University); New Delhi 110025 India
| | - Rajan Patel
- Biophysical Chemistry Laboratory; Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University); New Delhi 110025 India
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11
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Akram M, Bhat IA, Kabir-ud-Din KUD. New insights into binding interaction of novel ester-functionalized m-E2-m gemini surfactants with lysozyme: a detailed multidimensional study. RSC Adv 2015. [DOI: 10.1039/c5ra20576j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Different binding patterns of m-E2-m (12-E2-12 and 14-E2-14) surfactants to HEWL.
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Affiliation(s)
- Mohd Akram
- Department of Chemistry
- Aligarh Muslim University
- Aligarh-202002
- India
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12
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Ačkar Đ, Škrabal S, Šubarić D, Babić J, Miličević B, Jozinović A. Rheological Properties of Milk Chocolates as Influenced by Milk Powder Type, Emulsifier, and Cocoa Butter Equivalent Additions. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2014. [DOI: 10.1080/10942912.2014.923440] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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Vinceković M, Curlin M, Jurašin D. Impact of cationic surfactant on the self-assembly of sodium caseinate. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:8543-8554. [PMID: 25078419 DOI: 10.1021/jf5016472] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The impact of a cationic surfactant, dodecylammonium chloride (DDACl), on the self-assembly of sodium caseinate (SC) has been investigated by light scattering, zeta potential, and rheological measurements as well as by microscopy (transmission electron and confocal laser scanning microscopy). In SC dilute solutions concentration-dependent self-assembly proceeds through the formation of spherical associates and their aggregation into elongated structures composed of connected spheres. DDACl interacts with SC via its hydrophilic and hydrophobic groups, inducing changes in SC self-assembled structures. These changes strongly depend on the surfactant aggregation states (monomeric or micellar) as well as concentration ratio of both components, leading to the formation of soluble and insoluble complexes of nano- to microdimensions. DDACl monomers interact with SC self-assembled entities in a different way compared to their micelles. Surfactant monomers form soluble complexes (similar to surfactant mixed micelles) at lower SC concentration but insoluble gelatinous complexes at higher SC concentration. At surfactant micellar concentration soluble complexes with casein chains wrapped around surfactant micelles are formed. This study suggests that the use of proper cationic surfactant concentration will allow modification and control of structural changes of SC self-assembled entities.
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Affiliation(s)
- Marko Vinceković
- Department of Chemistry, Faculty of Agriculture, and ‡Department of Histology and Embryology, School of Medicine, University of Zagreb , Zagreb, Croatia
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14
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Kaur R, Mahajan RK. Twin-tailed surfactant induced conformational changes in bovine serum albumin: a detailed spectroscopic and physicochemical study. RSC Adv 2014. [DOI: 10.1039/c4ra03653k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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15
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Hedegaard SF, Nilsson C, Laurinmäki P, Butcher S, Urtti A, Yaghmur A. Nanostructured aqueous dispersions of citrem interacting with lipids and PEGylated lipids. RSC Adv 2013. [DOI: 10.1039/c3ra44583f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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16
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Sovilj V, Milanovic J, Petrovic L. Influence of gelatin–sodium stearoyl lactylate interaction on the rheological properties of gelatin gels. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2012.11.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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17
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Manna A, Chakravorti S. Role of block copolymer-micelle nanocomposites in dye–bovine serum albumin binding: a combined experimental and molecular docking study. ACTA ACUST UNITED AC 2013; 9:246-57. [DOI: 10.1039/c2mb25368b] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Nilsson C, Edwards K, Eriksson J, Larsen SW, Østergaard J, Larsen C, Urtti A, Yaghmur A. Characterization of oil-free and oil-loaded liquid-crystalline particles stabilized by negatively charged stabilizer citrem. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:11755-11766. [PMID: 22831645 DOI: 10.1021/la3021244] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The present study was designed to evaluate the effect of the negatively charged food-grade emulsifier citrem on the internal nanostructures of oil-free and oil-loaded aqueous dispersions of phytantriol (PHYT) and glyceryl monooleate (GMO). To our knowledge, this is the first report in the literature on the utilization of this charged stabilizing agent in the formation of aqueous dispersions consisting of well-ordered interiors (either inverted-type hexagonal (H(2)) phases or inverted-type microemulsion systems). Synchrotron small-angle X-ray scattering (SAXS) and cryogenic transmission electron microscopy (cryo-TEM) were used to characterize the dispersed and the corresponding nondispersed phases of inverted-type nonlamellar liquid-crystalline phases and microemulsions. The results suggest a transition between different internal nanostructures of the aqueous dispersions after the addition of the stabilizer. In addition to the main function of citrem as a stabilizer that adheres to the surface of the dispersed particles, it has a significant impact on the internal nanostructures, which is governed by the following factors: (1) its penetration between the hydrophobic tails of the lipid molecules and (2) its degree of incorporation into the lipid-water interfacial area. In the presence of citrem, the formation of aqueous dispersions with functionalized hydrophilic domains by the enlargement of the hydrophilic nanochannels of the internal H(2) phase in hexosomes and the hydrophilic core of the L(2) phase in emulsified microemulsions (EMEs) could be particularly attractive for solubilizing and controlling the release of positively charged drugs.
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Affiliation(s)
- Christa Nilsson
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
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19
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Hu M, Wang X, Wang H, Chai Y, He Y, Song G. Fluorescence spectroscopic studies on the interaction of Gemini surfactant 14-6-14 with bovine serum albumin. LUMINESCENCE 2011; 27:204-10. [DOI: 10.1002/bio.1333] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Revised: 04/19/2011] [Accepted: 05/20/2011] [Indexed: 11/06/2022]
Affiliation(s)
- Mengyao Hu
- Ministry of Education Key Laboratory for the Synthesis and Application of Organic Function Molecules; Hubei University; Wuhan; 430062; People's Republic of China
| | - Xue Wang
- Ministry of Education Key Laboratory for the Synthesis and Application of Organic Function Molecules; Hubei University; Wuhan; 430062; People's Republic of China
| | - Hui Wang
- Ministry of Education Key Laboratory for the Synthesis and Application of Organic Function Molecules; Hubei University; Wuhan; 430062; People's Republic of China
| | - Yan Chai
- Ministry of Education Key Laboratory for the Synthesis and Application of Organic Function Molecules; Hubei University; Wuhan; 430062; People's Republic of China
| | - Yu He
- Ministry of Education Key Laboratory for the Synthesis and Application of Organic Function Molecules; Hubei University; Wuhan; 430062; People's Republic of China
| | - Gongwu Song
- Ministry of Education Key Laboratory for the Synthesis and Application of Organic Function Molecules; Hubei University; Wuhan; 430062; People's Republic of China
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20
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Delorme V, Dhouib R, Canaan S, Fotiadu F, Carrière F, Cavalier JF. Effects of Surfactants on Lipase Structure, Activity, and Inhibition. Pharm Res 2011; 28:1831-42. [DOI: 10.1007/s11095-010-0362-9] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2010] [Accepted: 12/27/2010] [Indexed: 02/07/2023]
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21
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Richards A, Golding M, Wijesundera C, Lundin L. The Influence of Secondary Emulsifiers on Lipid Oxidation within Sodium Caseinate-Stabilized Oil-in-Water Emulsions. J AM OIL CHEM SOC 2010. [DOI: 10.1007/s11746-010-1642-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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22
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Mellema M, de Groot P, Golding M. Impaired or accelerated aggregation of proteins in sterilised milk by adding surfactants. Int Dairy J 2009. [DOI: 10.1016/j.idairyj.2009.05.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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23
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Wu D, Xu G, Feng Y, Wang Y, Zhu Y. Comparative study on interaction of bovine serum albumin with dissymmetric and symmetric gemini surfactant by spectral method. Colloid Polym Sci 2008. [DOI: 10.1007/s00396-008-1971-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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24
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Sonesson AW, Blom H, Hassler K, Elofsson UM, Callisen TH, Widengren J, Brismar H. Protein–surfactant interactions at hydrophobic interfaces studied with total internal reflection fluorescence correlation spectroscopy (TIR-FCS). J Colloid Interface Sci 2008; 317:449-57. [DOI: 10.1016/j.jcis.2007.09.089] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2007] [Revised: 09/27/2007] [Accepted: 09/27/2007] [Indexed: 11/26/2022]
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25
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Aloulou A, Puccinelli D, De Caro A, Leblond Y, Carrière F. A comparative study on two fungal lipases from Thermomyces lanuginosus and Yarrowia lipolytica shows the combined effects of detergents and pH on lipase adsorption and activity. Biochim Biophys Acta Mol Cell Biol Lipids 2007; 1771:1446-56. [PMID: 18022403 DOI: 10.1016/j.bbalip.2007.10.006] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2007] [Revised: 10/01/2007] [Accepted: 10/22/2007] [Indexed: 10/22/2022]
Abstract
The effects of various detergents and pH on the interfacial binding and activity of two fungal lipases from Yarrowia lipolytica (YLLIP2) and Thermomyces lanuginosus (TLL) were investigated using trioctanoin emulsions as well as monomolecular films spread at the air-water interface. Contrary to TLL, YLLIP2 was found to be more sensitive than TLL to interfacial denaturation but it was protected by detergent monomers and lowering the temperature. At pH 7.0, both the interfacial binding and the activities on trioctanoin of YLLIP2 and TLL were inhibited by sodium taurodeoxycholate (NaTDC). At pH 6.0, however, YLLIP2 remained active on trioctanoin in the presence of NaTDC, whereas TLL did not. YLLIP2 activity on trioctanoin was associated with strong interfacial binding of the enzyme to trioctanoin emulsion, whereas TLL was mostly detected in the water phase. The combined effects of bile salts and pH on lipase activity were therefore enzyme-dependent. YLLIP2 binds more strongly than TLL at oil-water interfaces at low pH when detergents are present. These findings are particularly important for lipase applications, in particular for enzyme replacement therapy in patients with pancreatic enzyme insufficiency since high detergent concentrations and highly variable pH values can be encountered in the GI tract.
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Affiliation(s)
- Ahmed Aloulou
- Laboratory of Enzymology at Interfaces and Physiology of Lipolysis, CNRS-UPR 9025-IBSM, 31 Chemin Joseph-Aiguier, 13009 Marseille, France
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Yuno-Ohta N, Corredig M. Characterization of β-Lactoglobulin A Gelation in the Presence of Sodium Caprate by Ultrasound Spectroscopy and Electron Microscopy. Biomacromolecules 2007; 8:2542-8. [PMID: 17630688 DOI: 10.1021/bm0701393] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect of sodium caprate (a fatty acid salt) on the formation of beta-lactoglobulin A gels was studied at constant temperature (30 or 35 degrees C) using ultrasonic spectroscopy. During incubation at these temperatures, ultrasonic attenuation increased with the addition of sodium caprate, and reached a plateau after 5-7 h of incubation. Comparing beta-lactoglobulin A with and without sodium caprate, a decrease in net ultrasonic velocity was observed. These results suggested that aggregation occurred during incubation with sodium caprate, and the sample showed an increase in compressibility. Transmission electron microscopy with negative staining showed the formation of filamentous aggregates of beta-lactoglobulin A at around 3-4.5 h of incubation with sodium caprate. These results demonstrated that sodium caprate induced the formation of structures with unique gel properties compared to those formed by heating beta-lactoglobulin in the presence of NaCl alone.
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Affiliation(s)
- Naoko Yuno-Ohta
- Junior College at Mishima, Nihon University, 2-31-145 Bunkyo-Cho, Mishima City, Shizuoka 411-8555, Japan.
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27
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Thermodynamic analysis of the impact of molecular interactions on the functionality of food biopolymers in solution and in colloidal systems. Food Hydrocoll 2007. [DOI: 10.1016/j.foodhyd.2006.02.009] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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28
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Liu J, Xu G, Wu D, Yu L. Spectroscopic Study on the Interaction between Bovine Serum Albumin and Tween‐20. J DISPER SCI TECHNOL 2006. [DOI: 10.1080/01932690600719099] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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29
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Sonesson AW, Elofsson UM, Brismar H, Callisen TH. Adsorption and mobility of a lipase at a hydrophobic surface in the presence of surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:5810-7. [PMID: 16768512 DOI: 10.1021/la0531244] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
With the aim of being able to manipulate the processes involved in interfacial catalysis, we have studied the effects of a mixture of nonionic/anionic surfactants, C12E6/LAS (1:2 mol %), on the adsorption and surface mobility of a lipase obtained from Thermomyces lanuginosus (TLL). Surface plasmon resonance (SPR) and ellipsometry were used to analyze the competitive adsorption process between surfactants and TLL onto hydrophobic model surfaces intended to mimic an oily substrate for the lipase. We obtained the surface diffusion coefficient of a fluorescently labeled TLL variant on silica silanized with octadecyltrichlorosilane (OTS) by fluorescence recovery after photobleaching (FRAP) on a confocal laser scanning microscope. By means of ellipsometry we calibrated the fluorescence intensity with the surface density of the lipase. The TLL diffusion was measured at different surface densities of the enzyme and at two time intervals after coadsorption with different concentrations of C12E6/LAS. The surfactant concentrations were chosen to represent concentrations below the critical micelle concentration (CMC), in the CMC region, and above the CMC. The apparent TLL surface diffusion was extrapolated to infinite surface dilution, D0. We found that the presence of surfactants strongly modulated the surface mobility of TLL: with D(0) = 0.8 x 10(-11) cm2/s without surfactants and D0 = 13.1 x 10(-11) cm2/s with surfactants above the CMC. The increase in lipase mobility on passing the CMC was also accompanied by a 2-fold increase in the mobile fraction of TLL. SPR analysis revealed that surface bound TLL was displaced by C12E6/LAS in a concentration-dependent manner, suggesting that the observed increase in surface mobility imparts bulk-mediated diffusion and so-called rebinding of TLL to the surface. Our combined results on lipase/surfactant competitive adsorption and lipase surface mobility show how surfactants may play an important role in regulating interfacial catalysis from physiological digestion to technical applications such as detergency.
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Ozdemir G, Sezgin OE. Keratin-rhamnolipids and keratin-sodium dodecyl sulfate interactions at the air/water interface. Colloids Surf B Biointerfaces 2006; 52:1-7. [PMID: 16837174 DOI: 10.1016/j.colsurfb.2006.05.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2006] [Revised: 04/12/2006] [Accepted: 05/09/2006] [Indexed: 10/24/2022]
Abstract
Keratin-surfactant interactions at the air/solution interface may be indicative for skin irritation by surfactants. In this study pure keratin was extracted from chicken feathers as described by Schrooyen at al. and the adsorption properties of biologically produced rhamnolipids (RL) and sodium dodecyl sulfate (SDS) mixed with keratin molecules were investigated by surface tension measurements. Keratin was added in three specific amounts to RL and SDS aqueous solutions of varying concentrations, respectively, and keratin-RL and keratin-SDS interactions were investigated at pH 6.2 and 5.0. The surface tension measurements showed that surfactant-keratin complexes were formed in the solutions at pH 6.2. At low RL concentrations the added amount of keratin decreased the surface tension as a result of the hydrophobic keratin-RL complexes formed, which have covered the air/solution interface. Beginning from moderate RL concentrations, less surface active keratin-RL complexes were formed due to hydrophilization of the former complexes and they were removed from the interface to the bulk phase as a result of the competitive adsorption mechanism and pure RL molecules covered the interface gradually. At low SDS concentrations surface tension decrease was also observed by the covering of the air/solution interface with keratin-SDS complexes. At moderate SDS concentrations the keratin-SDS complexes exhibited a more surface active feature. Unlike the keratin-RL complexes, they have remained at the interface until the higher SDS concentrations and keratin ratios. However, at the minimum surface tension value of the pure SDS at its CMC value, the surface tension of the keratin-SDS mixture reached the value of pure SDS solution and the air/solution interface has been covered again only with pure SDS monomers. The keratin-surfactant solutions prepared at pH 5 showed lower surface tension values compared to that measured at pH 6.2 and the surface tension behavior of RL and SDS resembled each other. Above a certain surfactant concentration the addition of keratin to surfactant solutions rendered the surface less surface active compared to their pure surfactant solutions at pH 5.0. The consideration of the surface tension behavior of two anionic surfactants has shown that the RL-keratin interactions are milder than SDS-keratin interactions at pH 6.2 and 5.0.
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Affiliation(s)
- G Ozdemir
- Department of Chemical Engineering, Ege University, 35100 Izmir, Turkey.
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Semenova MG, Belyakova LE, Polikarpov YN, Il'in MM, Istarova TA, Anokhina MS, Tsapkina EN. Thermodynamic Analysis of the Impact of the Surfactant−Protein Interactions on the Molecular Parameters and Surface Behavior of Food Proteins. Biomacromolecules 2005; 7:101-13. [PMID: 16398504 DOI: 10.1021/bm050455m] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper reports on the thermodynamics of the interactions between surfactants (anionic, CITREM, SSL; nonionic, PGE; zwitterionic, phospholipids) and food proteins (sodium caseinate, legumin) depending on the chemical structure and molecular state (individual molecules, micelles) of the surfactants and the molecular parameters (conformation, molar mass, charge) of the proteins under changes of pH in the range from 7.2 to 5.0 and temperature from 293 to 323 K. The marked effect of the protein-surfactant interactions on the molecular parameters (the weight-average molar mass, the gyration and hydrodynamic radii) and the thermodynamic affinity of the proteins for an aqueous medium were determined by a combination of static and dynamic laser light scattering. Thermodynamically justified schematic sketches of the molecular mechanisms of the complex formation between like-charged proteins and surfactants have been proposed. In response to the complex formation between the proteins and the surfactants, the more stable and fine foams have been detected generally.
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Affiliation(s)
- Maria G Semenova
- Institute of Biochemical Physics of Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia.
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Caetano W, Ferreira M, Oliveira ON, Itri R. Enhanced stabilization of aerosol-OT surfactant monolayer upon interaction with small amounts of bovine serum albumin at the air–water interface. Colloids Surf B Biointerfaces 2004; 38:21-7. [PMID: 15465300 DOI: 10.1016/j.colsurfb.2004.08.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2004] [Accepted: 08/17/2004] [Indexed: 11/16/2022]
Abstract
An investigation is made of the influence from small amounts of the protein bovine serum albumin (BSA) on the lateral organization of low molecular weight surfactant sodium bis-2-ethylhexyl sulfosuccinate (AOT) at the air-water interface. Surface pressure (pi - A), surface potential (deltaV - A) and Brewster angle microscopy (BAM) experiments were carried out, with particular emphasis on the monolayer stability under successive compression-expansion cycles. AOT monolayer is not stable at the air-water interface, which means that the majority of AOT molecules go into the aqueous subphase as monomers and/or normal micelles. When a waiting time elapses between spreading and compression, the surfactant monolayer tends to reorganize partially at the air-water interface, with a monolayer expansion being observed for waiting times as large as 12 h. The incorporation of very small amount of BSA (10(-9)M) at the interface, also inferred from BAM, increases the monolayer stability as revealed by pi - A and deltaV - A results. For a waiting time of circa 3 h, the mixed monolayer reaches its maximum stability. This must be related to protein (and/or protein-surfactant complexes) adsorbed onto the AOT monolayer, thus altering the BSA conformation to accommodate its hydrophobic/hydrophilic residues. Furthermore, the effects from such small amounts of BSA in the monolayer formation and stabilization mean that the AOT monolayer responds cooperatively to BSA.
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Affiliation(s)
- Wilker Caetano
- Depto. de Física Aplicada, Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970 São Paulo/SP, Brazil
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Il'in MM, Semenova MG, Belyakova LE, Antipova AS, Polikarpov YN. Thermodynamic and functional properties of legumin (11S globulin from Vicia faba) in the presence of small-molecule surfactants: effect of temperature and pH. J Colloid Interface Sci 2004; 278:71-80. [PMID: 15313639 DOI: 10.1016/j.jcis.2004.05.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2003] [Accepted: 05/24/2004] [Indexed: 11/22/2022]
Abstract
We report on the effect of a set of water-dispersible small-molecule surfactants (the main and the longest-hydrocarbon components of which are a citric acid ester of monostearate, a sodium salt of stearol-lactoyl lactic acid, and a polyglycerol ester of stearic acid) on molecular, thermodynamic, and functional properties of the major storage protein of broad beans (Vicia faba) legumin in different molecular states (native, heated, and acid-denatured). The interaction between legumin and the surfactants has been characterized by a combination of thermodynamic methods, namely, mixing calorimetry and multiangle laser static and dynamic light scattering. It was found that hydrogen bonds, electrostatic interactions, and hydrophobic contacts provided a basis for the interactions between the surfactants and both the native and the denatured protein in aqueous medium. Intensive association of the protein molecules in a bulk aqueous medium in the presence of the surfactants was revealed by static and dynamic laser light scattering. In consequence of this, both the surface activity and the gel-forming ability of legumin increased markedly, which has been shown by tensiometry, estimation of protein foaming capacity, and steady-state viscometry. A likely molecular mechanism underlying the effects of small-molecule surfactants on legumin structure-forming properties at the interface and in a bulk aqueous medium is discussed.
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Affiliation(s)
- Michael M Il'in
- Institute of Biochemical Physics of Russian Academy of Sciences, Vavilov str. 28, Moscow 119991, Russia
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Chronakis IS, Fredholm A, Triantafyllou AO, Oste R. Complex formation in aqueous medium of partially hydrolysed oat cereal proteins with sodium stearoyl-2 lactylate (SSL) lipid surfactant and implications for bile acids activity. Colloids Surf B Biointerfaces 2004; 35:175-84. [PMID: 15261029 DOI: 10.1016/j.colsurfb.2004.03.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2003] [Accepted: 03/15/2004] [Indexed: 11/26/2022]
Abstract
Sodium stearoyl-2 lactylate (SSL) lipid surfactant molecules specifically bind partially hydrolysed oat proteins in aqueous medium and significantly enhance the dispersion stability of oat cereal preparations. The proposed complexation is composition dependent and a greater understanding of the role of both oat proteins and lipid surfactant in the effect was gained with data from high performance liquid chromatography (HPLC-UV), viscometry and differential scanning micro calorimetry. The effect of the lipid surfactant on the degree of association is primarily governed by the conformational activity of oat protein molecules related to the extent of protein hydrolysed state, as well as protein unfolded and subsequent aggregated structures. SSL does not dissociate oat proteins into subunits or destroy important hydrophobic contacts already stabilising the protein molecules. Although the exact mode of association is unknown, the present study demonstrates that such interactions occur in a specific manner and suggest selectivity of oat proteins for individual fatty acids. The effect of various amounts of bile acids on SSL-oat protein interaction was also investigated, as a first attempt to investigate the role of lipid surfactant molecules in the known cholesterol-lowering action of oat cereal ingredients and to elucidate favourable conditions by which oat cereal can elicit hypocholesterolemic effects.
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Affiliation(s)
- Ioannis S Chronakis
- IFP Research, Swedish Institute for Fiber and Polymer Research, Box 104, SE-431 22 Mölndal, Sweden.
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Rodrı́guez Patino JM, Rodrı́guez Niño M, Sánchez CC. Protein–emulsifier interactions at the air–water interface. Curr Opin Colloid Interface Sci 2003. [DOI: 10.1016/s1359-0294(03)00095-5] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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