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Aggrawal R, Halder S, Dyagala S, Saha SK. Role of Dual Nature of Ionic Liquid in Solvation Dynamics and Rotational Diffusion in Mixed Micelles: A Time‐Resolved Fluorescence and Fluorescence Anisotropy Study. ChemistrySelect 2023. [DOI: 10.1002/slct.202204360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Affiliation(s)
- Rishika Aggrawal
- Department of Chemistry Birla Institute of Technology & Science (BITS) Pilani Hyderabad Campus Telangana 500078 INDIA
| | - Sayantan Halder
- Department of Chemistry Birla Institute of Technology & Science (BITS) Pilani Hyderabad Campus Telangana 500078 INDIA
| | - Shalini Dyagala
- Department of Chemistry Birla Institute of Technology & Science (BITS) Pilani Hyderabad Campus Telangana 500078 INDIA
| | - Subit Kumar Saha
- Department of Chemistry Birla Institute of Technology & Science (BITS) Pilani Hyderabad Campus Telangana 500078 INDIA
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2
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Parekh PY, Patel VI, Khimani MR, Bahadur P. Self-assembly of bile salts and their mixed aggregates as building blocks for smart aggregates. Adv Colloid Interface Sci 2023; 312:102846. [PMID: 36736167 DOI: 10.1016/j.cis.2023.102846] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 01/11/2023] [Accepted: 01/22/2023] [Indexed: 01/27/2023]
Abstract
The present communication offers a comprehensive overview of the self-assembly of bile salts emphasizing their mixed smart aggregates with a variety of amphiphiles. Using an updated literature survey, we have explored the dissimilar interactions of bile salts with different types of surfactants, phospholipids, ionic liquids, drugs, and a variety of natural and synthetic polymers. While assembling this review, special attention was also provided to the potency of bile salts to alter the size/shape of aggregates formed by several amphiphiles to use these aggregates for solubility improvement of medicinally important compounds, active pharmaceutical ingredients, and also to develop their smart delivery vehicles. A fundamental understanding of bile salt mixed aggregates will enable the development of new strategies for improving the bioavailability of drugs solubilized in newly developed potential hosts and to formulate smart aggregates of desired morphology for specific targeted applications. It enriches our existing knowledge of the distinct interactions exerted in mixed systems of bile salts with variety of amphiphiles. By virtue of this, researchers can get innovative ideas to construct novel nanoaggregates from bile salts by incorporating various amphiphiles that serve as a building block for smart aggregates for their numerous industrial applications.
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Affiliation(s)
- Paresh Y Parekh
- Department of Chemistry, Veer Narmad South Gujarat University, Surat 395007, Gujarat, India
| | - Vijay I Patel
- Department of Chemistry, Navyug Science College, Rander Road, Surat 395009, Gujarat, India.
| | - Mehul R Khimani
- Countryside International School, Nr. Bhesan Railway Crossing, CIS Barbodhan Road, Surat 394125, Gujarat, India
| | - Pratap Bahadur
- Department of Chemistry, Veer Narmad South Gujarat University, Surat 395007, Gujarat, India
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3
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Dinis TBV, e Silva FA, Sousa F, Freire MG. Advances Brought by Hydrophilic Ionic Liquids in Fields Involving Pharmaceuticals. MATERIALS (BASEL, SWITZERLAND) 2021; 14:6231. [PMID: 34771756 PMCID: PMC8585031 DOI: 10.3390/ma14216231] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/07/2021] [Accepted: 10/12/2021] [Indexed: 12/13/2022]
Abstract
The negligible volatility and high tunable nature of ionic liquids (ILs) have been the main drivers of their investigation in a wide diversity of fields, among which is their application in areas involving pharmaceuticals. Although most literature dealing with ILs is still majorly devoted to hydrophobic ILs, evidence on the potential of hydrophilic ILs have been increasingly provided in the past decade, viz., ILs with improved therapeutic efficiency and bioavailability, ILs with the ability to increase drugs' aqueous solubility, ILs with enhanced extraction performance for pharmaceuticals when employed in biphasic systems and other techniques, and ILs displaying low eco/cyto/toxicity and beneficial biological activities. Given their relevance, it is here overviewed the applications of hydrophilic ILs in fields involving pharmaceuticals, particularly focusing on achievements and advances witnessed during the last decade. The application of hydrophilic ILs within fields involving pharmaceuticals is here critically discussed according to four categories: (i) to improve pharmaceuticals solubility, envisioning improved bioavailability; (ii) as IL-based drug delivery systems; (iii) as pretreatment techniques to improve analytical methods performance dealing with pharmaceuticals, and (iv) in the recovery and purification of pharmaceuticals using IL-based systems. Key factors in the selection of appropriate ILs are identified. Insights and perspectives to bring renewed and effective solutions involving ILs able to compete with current commercial technologies are finally provided.
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Affiliation(s)
- Teresa B. V. Dinis
- CICECO—Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; (T.B.V.D.); (F.A.eS.)
| | - Francisca A. e Silva
- CICECO—Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; (T.B.V.D.); (F.A.eS.)
| | - Fani Sousa
- CICS-UBI—Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Av. Infante D. Henrique, 6201-506 Covilhã, Portugal
| | - Mara G. Freire
- CICECO—Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; (T.B.V.D.); (F.A.eS.)
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4
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Mishra SS, Mohanty S, Mishra J, Subuddhi U. Photophysical Properties of Coumarin 1 in Bile Salt Aggregates: An Insight into the Role of Bile Salt Structure on the Aggregation Behavior. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:16555-16567. [PMID: 31742410 DOI: 10.1021/acs.langmuir.9b02664] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The photophysical behavior of Coumarin 1 (Cou1), a well-known 7-aminocoumarin derivative, is very sensitive to the microenvironment in which it resides. In the present study, the effect of six bile salt variants on the photophysical behavior of Cou1 has been investigated. Dihydroxy (deoxycholates) as well as trihydroxy (cholates) bile salts with conjugated and unconjugated side chains have been chosen to get insight into the role of bile salt structure on the microenvironment of Cou1. Cou1 photophysics was found to be extremely sensitive to the aggregation process of the bile salt variants. The reduced polarity of the micellar environment stabilizes the planar intramolecular charge transferred state of Cou1, resulting in significant modulation in its photophysics in the bile salt media. The changes in the fluorescence parameters such as fluorescence intensity, emission energy, fluorescence quantum yield, anisotropy, and lifetime of Cou1 reveal that there is a distinct difference in the aggregation behavior of deoxycholates from that of cholates. The deoxycholates form micelles more or less critically similar to those of conventional surfactants, whereas the cholates self-assemble rather noncritically over a wide concentration range, thus signifying the vital role of the extra hydroxyl group in the aggregation pattern of trihydroxy bile salts. The conjugated bile salts are found to provide a relatively more compact, rigid, and hydrophobic microenvironment to Cou1 as compared to their unconjugated counterparts. Considering the significant modulation in the photophysical properties of Cou1, it has been employed as a molecular reporter for monitoring the aggregation process of bile salt variants and important information could be obtained about the effect of bile salt structure on the aggregation pattern and also about the micellar properties.
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Affiliation(s)
- Smruti Snigdha Mishra
- Department of Chemistry , National Institute of Technology , Rourkela , 769008 Odisha , India
| | - Subhrajit Mohanty
- Department of Chemistry , National Institute of Technology , Rourkela , 769008 Odisha , India
| | - Jhili Mishra
- Department of Chemistry , Indian Institute of Technology , Madras , Chennai 600036 , India
| | - Usharani Subuddhi
- Department of Chemistry , National Institute of Technology , Rourkela , 769008 Odisha , India
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5
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Liu H, Du Y, Gao J, Zhou L, He Y, Ma L, Liu G, Huang Z, Jiang Y. Compartmentalization of Biocatalysts by Immobilizing Bienzyme in Hollow ZIF-8 for Colorimetric Detection of Glucose and Phenol. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b04391] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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6
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Du Y, Gao J, Zhou L, Ma L, He Y, Zheng X, Huang Z, Jiang Y. MOF-Based Nanotubes to Hollow Nanospheres through Protein-Induced Soft-Templating Pathways. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1801684. [PMID: 30937262 PMCID: PMC6425429 DOI: 10.1002/advs.201801684] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 12/06/2018] [Indexed: 06/09/2023]
Abstract
A controllable and facile strategy is established for constructing metal-organic frameworks-based (MOF-based) hollow composites via a protein-induced soft-templating pathway. Using metal-sodium deoxycholate hydrogel as soft-template, nanotubes are gained while the protein is absent. With the presence of protein, hollow nanospheres structure are prepared by changing the amount of protein. To verify the universality of the proposed pathway, two kinds of proteins (Burkholderia cepacia lipase and penicillin G acylase) and three kinds of MOF (ZIF-8, ZIF-67, and Fe-MOF) are adopted as model proteins and materials, and the obtained protein-containing composites (named protein@H-MOF) possess high bioactivity and stability. This proposed strategy provides a facile method for preparing MOF-based composites under mild conditions, facilitating the applications of MOF in the fields of biocatalyst construction, biomolecule encapsulation, and drug delivery.
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Affiliation(s)
- Yingjie Du
- School of Chemical EngineeringHebei University of TechnologyNo. 8 Guangrong RoadHongqiao DistrictTianjin300130China
| | - Jing Gao
- School of Chemical EngineeringHebei University of TechnologyNo. 8 Guangrong RoadHongqiao DistrictTianjin300130China
| | - Liya Zhou
- School of Chemical EngineeringHebei University of TechnologyNo. 8 Guangrong RoadHongqiao DistrictTianjin300130China
| | - Li Ma
- School of Chemical EngineeringHebei University of TechnologyNo. 8 Guangrong RoadHongqiao DistrictTianjin300130China
| | - Ying He
- School of Chemical EngineeringHebei University of TechnologyNo. 8 Guangrong RoadHongqiao DistrictTianjin300130China
| | - Xuefang Zheng
- School of Chemical EngineeringHebei University of TechnologyNo. 8 Guangrong RoadHongqiao DistrictTianjin300130China
| | - Zhihong Huang
- School of Chemical EngineeringHebei University of TechnologyNo. 8 Guangrong RoadHongqiao DistrictTianjin300130China
| | - Yanjun Jiang
- School of Chemical EngineeringHebei University of TechnologyNo. 8 Guangrong RoadHongqiao DistrictTianjin300130China
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7
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Singh G, Komal, Singh M, Singh O, Kang TS. Hydrophobically Driven Morphologically Diverse Self-Assembled Architectures of Deoxycholate and Imidazolium-Based Biamphiphilic Ionic Liquids in Aqueous Medium. J Phys Chem B 2018; 122:12227-12239. [PMID: 30525630 DOI: 10.1021/acs.jpcb.8b10161] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Biamphiphilic ionic liquids (BAILs) having amphiphilic cation and anion are thought to exhibit improved surface activity and colloidal stability to be utilized in different applications. For their effective use, a control over synergetic hydrophobic and electrostatic interactions between oppositely charged ions along with the possibility of tuning of hydrophobicity of the core of aggregates is required. Focusing on this, new BAILs comprising a bile salt anion, deoxycholate, [DC]-, and 1-alkyl-3-methylimidazolium cations, [C nmim]+ ( n = 2, 4, 6, 8, and 12), were synthesized and characterized for their behavior at air-solution interface as well as in bulk. The synthesized BAILs exhibit high surface activity and self-assemble in the form of different architectures ranging from nanosheets (NSs), nanorods, and vesicles with varying hydrophobicities of the formed core of aggregates, depending on the length of alkyl chain of [C nmim]+. Analysis of various parameters obtained from investigated techniques suggested the changing role of [C nmim]+ from a counterion ( n = 2 and 4) to a cosurfactant ( n = 8 and 12) via a borderline case of [C6mim]+. This changeover in the nature of counterion controlled by hydrophobicity of alkyl chain resulted in morphological diversification in self-assembled architectures via varying set of interactions. It is believed that the present work would offer new perspectives in the self-assembly phenomenon of surfactants in general and surface active ionic liquids in particular to devise new strategies for inducing morphology-dependent functionality in self-assembled structures of BAILs.
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Affiliation(s)
- Gurbir Singh
- Department of Chemistry, UGC-Centre for Advanced Studies-II , Guru Nanak Dev University , Amritsar 143005 , India
| | - Komal
- Department of Chemistry, UGC-Centre for Advanced Studies-II , Guru Nanak Dev University , Amritsar 143005 , India
| | - Manpreet Singh
- Department of Chemistry, UGC-Centre for Advanced Studies-II , Guru Nanak Dev University , Amritsar 143005 , India
| | - Ormanpreet Singh
- Department of Chemistry, UGC-Centre for Advanced Studies-II , Guru Nanak Dev University , Amritsar 143005 , India
| | - Tejwant Singh Kang
- Department of Chemistry, UGC-Centre for Advanced Studies-II , Guru Nanak Dev University , Amritsar 143005 , India
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8
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Pyne A, Kundu S, Banerjee P, Sarkar N. Unveiling the Aggregation Behavior of Doxorubicin Hydrochloride in Aqueous Solution of 1-Octyl-3-methylimidazolium Chloride and the Effect of Bile Salt on These Aggregates: A Microscopic Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3296-3306. [PMID: 29474788 DOI: 10.1021/acs.langmuir.8b00029] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this article, we have unveiled the aggregation behavior of a potent chemotherapeutic drug, doxorubicin hydrochloride (Dox) in a well-known imidazolium based surface active ionic liquid (SAIL), 1-octyl-3-methylimidazolium chloride (C8mimCl). The aggregates formed by Dox in C8mimCl have been characterized using dynamic light scattering (DLS), fluorescence lifetime imaging microscopy (FLIM), high-resolution transmission electron microscopy (HR-TEM), analytical transmission electron microscopy (analytical TEM), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), and Fourier-transform infrared spectroscopy (FTIR) measurements. It is found that Dox forms large spherical aggregates in the presence of C8mimCl SAIL. We have also explored the driving force behind this aggregation behavior of Dox in C8mimCl. Furthermore, it is observed that in the presence of a common bile salt, sodium cholate (NaCh), Dox/C8mimCl spherical aggregates disrupt to form rodlike fibrillar aggregates. Therefore, formation of spherical aggregates and also its disruption into rodlike fibrillar aggregates have been performed, and this is expected to open a new scope for the design of a new generation smart drug delivery system where the drug itself aggregates to form the delivery system.
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Affiliation(s)
- Arghajit Pyne
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , West Bengal , India
| | - Sangita Kundu
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , West Bengal , India
| | - Pavel Banerjee
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , West Bengal , India
| | - Nilmoni Sarkar
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , West Bengal , India
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9
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Abstract
In the last two decades, researchers have extensively studied highly stable and ordered supramolecular assembly formation using oppositely charged surfactants. Thereafter, surface-active ionic liquids (SAILs), a special class of room temperature ionic liquids (RTILs), replace the surfactants to form various supramolecular aggregates. Therefore, in the last decade, the building blocks of the supramolecular aggregates (micelle, mixed micelle, and vesicular assemblies) have changed from oppositely charged surfactant/surfactant pair to surfactant/SAIL and SAIL/SAIL pair. It is also found that various biomolecules can also interact with SAILs to construct biologically important supramolecular assemblies. The very latest addition to this combination of ion pairs is the dye molecules having a long hydrophobic chain part along with a hydrophilic ionic head group. Thus, dye/surfactant or dye/SAIL pair also produces different assemblies through electrostatic, hydrophobic, and π-π stacking interactions. Vesicles are one of the important self-assemblies which mimic cellular membranes, and thus have biological application as a drug carrier. Moreover, vesicles can act as a suitable microreactor for nanoparticle synthesis.
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Kundu N, Roy S, Mukherjee D, Maiti TK, Sarkar N. Unveiling the Interaction between Fatty-Acid-Modified Membrane and Hydrophilic Imidazolium-Based Ionic Liquid: Understanding the Mechanism of Ionic Liquid Cytotoxicity. J Phys Chem B 2017; 121:8162-8170. [PMID: 28756672 DOI: 10.1021/acs.jpcb.7b06231] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Ionic liquids (ILs) are considered as "green solvents" for more than 2 decades. However, recent studies suggest that some ILs exhibit greater toxicity compared to common solvents. As a proactive effort to better understand the molecular origin of the cytotoxicity, the work herein presents the systemic characterization of the interaction between model membrane composed of fatty acids and popular imidazolium-based hydrophilic IL. The fusion kinetics between the vesicles demonstrates the swelling of the vesicle. Further, membrane fluidity is determined using the isomerization kinetics of a lipophilic dye, merocyanine-540, and in the presence of IL, the fluidity of the inner water pool of the vesicle is increased. The results can be directly correlated to the cytotoxicity generated by IL in K562 cell, a human erythroleukemic cell line. High-concentration IL ruptures the cell membrane and causes membrane permeabilization. Thus, the results would help to facilitate the rational design of nontoxic ILs.
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Affiliation(s)
- Niloy Kundu
- Department of Chemistry and ‡Department of Biotechnology, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Shreya Roy
- Department of Chemistry and ‡Department of Biotechnology, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Devdeep Mukherjee
- Department of Chemistry and ‡Department of Biotechnology, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Tapas Kumar Maiti
- Department of Chemistry and ‡Department of Biotechnology, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry and ‡Department of Biotechnology, Indian Institute of Technology , Kharagpur 721302, WB, India
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11
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Koley S, Ghosh S. Encapsulation and Residency of a Hydrophobic Dye within the Water-Filled Interior of a PAMAM Dendrimer Molecule. J Phys Chem B 2017; 121:1930-1940. [DOI: 10.1021/acs.jpcb.6b10176] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Somnath Koley
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Khurda 752050, Odisha, India
| | - Subhadip Ghosh
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Khurda 752050, Odisha, India
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12
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Egorova KS, Gordeev EG, Ananikov VP. Biological Activity of Ionic Liquids and Their Application in Pharmaceutics and Medicine. Chem Rev 2017; 117:7132-7189. [PMID: 28125212 DOI: 10.1021/acs.chemrev.6b00562] [Citation(s) in RCA: 902] [Impact Index Per Article: 128.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Ionic liquids are remarkable chemical compounds, which find applications in many areas of modern science. Because of their highly tunable nature and exceptional properties, ionic liquids have become essential players in the fields of synthesis and catalysis, extraction, electrochemistry, analytics, biotechnology, etc. Apart from physical and chemical features of ionic liquids, their high biological activity has been attracting significant attention from biochemists, ecologists, and medical scientists. This Review is dedicated to biological activities of ionic liquids, with a special emphasis on their potential employment in pharmaceutics and medicine. The accumulated data on the biological activity of ionic liquids, including their antimicrobial and cytotoxic properties, are discussed in view of possible applications in drug synthesis and drug delivery systems. Dedicated attention is given to a novel active pharmaceutical ingredient-ionic liquid (API-IL) concept, which suggests using traditional drugs in the form of ionic liquid species. The main aim of this Review is to attract a broad audience of chemical, biological, and medical scientists to study advantages of ionic liquid pharmaceutics. Overall, the discussed data highlight the importance of the research direction defined as "Ioliomics", studies of ions in liquids in modern chemistry, biology, and medicine.
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Affiliation(s)
- Ksenia S Egorova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky prospect 47, Moscow 119991, Russia
| | - Evgeniy G Gordeev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky prospect 47, Moscow 119991, Russia
| | - Valentine P Ananikov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky prospect 47, Moscow 119991, Russia.,Department of Chemistry, Saint Petersburg State University , Stary Petergof 198504, Russia
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Mondal R, Ghosh N, Mukherjee S. Contrasting effects of pH on the modulation of the structural integrity of hemoglobin induced by sodium deoxycholate. Phys Chem Chem Phys 2016; 18:30867-30876. [PMID: 27801442 DOI: 10.1039/c6cp05216a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bile salt-mediated conformational modification of hemoglobin (Hb) was examined at three different pHs i.e., 3.2, 7.4 and 9.0. The added bile salt, sodium deoxycholate (NaDC), decreases the α-helicity in Hb (α-helix: 71.3% → 61.7% in the presence of 9.6 mM NaDC, and 83.2% → 66.2% in the presence of 14 mM NaDC, at pH 7.4 and 9.0, respectively), while a reverse pattern of modification in the Circular Dichroism (CD) spectra of Hb is found at pH 3.2. The acid-induced denatured Hb (pH 3.2) regains its structural integrity by changing conformation from a random coil to an α-helix rich secondary structure upon addition of NaDC (α-helix: 10.4% → 53.4%, β-sheet: 31.0% → 18.5% and random coil: 58.6% → 28.1%, in the presence of 0.65 mM NaDC). Also, a step-wise binding interaction pattern of Hb with NaDC was revealed at pH 7.4 and 9.0 upon variation of steady-state fluorescence intensity and average lifetime of Hb. From the fluorescence lifetime decay pattern, the decrement of energy transfer from Trp to a heme group was found upon the addition of NaDC at pH 7.4 and 9.0. However, at pH 3.2, the modification of the time-resolved fluorescence decay behavior of Hb within NaDC is typically reversed, where the energy transfer from Trp to heme is restored to some extent. Thermodynamic analysis suggests that the Hb-NaDC binding interaction is characterized by a dominant entropic contribution interpreted on the basis of release of ordered water molecules to the bulk aqueous phase.
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Affiliation(s)
- Ramakanta Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhauri, Bhopal Bypass Road, Bhopal 426066, Madhya Pradesh, India.
| | - Narayani Ghosh
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhauri, Bhopal Bypass Road, Bhopal 426066, Madhya Pradesh, India.
| | - Saptarshi Mukherjee
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhauri, Bhopal Bypass Road, Bhopal 426066, Madhya Pradesh, India.
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14
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Pillai SA, Patel VI, Ray D, Parikh JK, Aswal VK, Bahadur P. Microstructural micellar transition in bile salt–ionic liquid mixed systems in water: a DLS and SANS study. RSC Adv 2016. [DOI: 10.1039/c6ra22418k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Bile salt assisted morphological changes of ionic liquid micelles.
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Affiliation(s)
- Sadafara A. Pillai
- Department of Chemistry
- Veer Narmad South Gujarat University
- Surat-395007
- India
| | - Vijay I. Patel
- Department of Chemistry
- Jamanaben Narottambhai Motiram Patel Science College
- Surat-395007
- India
| | - Debes Ray
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Jigisha K. Parikh
- Department of Chemical Engineering
- Sardar Vallabhbhai National Institute of Technology
- Surat-395007
- India
| | - Vinod K. Aswal
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Pratap Bahadur
- Department of Chemistry
- Veer Narmad South Gujarat University
- Surat-395007
- India
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