1
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Mizoue Y, Takahashi R, Sakurai K, Yusa SI. A Thermo-Responsive Polymer Micelle with a Liquid Crystalline Core. Polymers (Basel) 2023; 15:polym15030770. [PMID: 36772069 PMCID: PMC9920352 DOI: 10.3390/polym15030770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 01/25/2023] [Accepted: 01/31/2023] [Indexed: 02/05/2023] Open
Abstract
An amphiphilic diblock copolymer (PChM-PNIPAM), composed of poly(cholesteryl 6-methacryloyloxy hexanoate) (PChM) and poly(N-isopropyl acrylamide) (PNIPAM) blocks, was prepared via reversible addition-fragmentation chain transfer radical polymerization. The PChM and PNIPAM blocks exhibited liquid crystalline behavior and a lower critical solution temperature (LCST), respectively. PChM-PNIPAM formed water-soluble polymer micelles in water below the LCST because of hydrophobic interactions of the PChM blocks. The PChM and PNIPAM blocks formed the core and hydrophilic shell of the micelles, respectively. With increasing temperature, the molecular motion of the pendant cholesteryl groups increased, and a liquid crystalline phase transition occurred from an amorphous state in the core. With further increases in temperature, the PNIPAM block in the shell exhibited the LCST and dehydrated. Hydrophobic interactions of the PNIPAM shells resulted in inter-micellar aggregation above the LCST.
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Affiliation(s)
- Yoko Mizoue
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji 671-2280, Hyogo, Japan
| | - Rintaro Takahashi
- Department of Energy Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Aichi, Japan
| | - Kazuo Sakurai
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Kitakyushu 808-0135, Fukuoka, Japan
| | - Shin-ichi Yusa
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji 671-2280, Hyogo, Japan
- Correspondence:
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2
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Šurlan J, Šereš Z, Dokić L, Krstonošić V, Maravić N. Evaluation of sugar beet pectin viscosity, surface activity, conductivity and zeta potential in sodium chloride aqueous solutions. Food Hydrocoll 2023. [DOI: 10.1016/j.foodhyd.2023.108490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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3
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Wang L, Lu QM, Zeng T, Yang JW, Hu XQ, Zhang HB. Synthesis and characterization of a cationic dextran-based flocculant and its application in bacterial sedimentation. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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4
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Verma D, Rashmi, Achazi K, Singh A, Schade B, Haag R, Sharma SK. Synthesis of
d
‐
glucitol
based Gemini amphiphilic nanotransporters. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Diksha Verma
- Department of Chemistry University of Delhi Delhi India
| | - Rashmi
- Institut für Chemie und Biochemie Freie Universität Berlin Berlin Germany
| | - Katharina Achazi
- Institut für Chemie und Biochemie Freie Universität Berlin Berlin Germany
| | - Abhishek Singh
- Institut für Chemie und Biochemie Freie Universität Berlin Berlin Germany
| | - Boris Schade
- Forschungszentrum für Elektronenmikroskopie, Institut für Chemie und Biochemie and Core Facility BioSupraMol, Institut für Chemie und Biochemie Freie Universität Berlin Berlin Germany
| | - Rainer Haag
- Institut für Chemie und Biochemie Freie Universität Berlin Berlin Germany
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5
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Characterization of hydrophobic interaction of galactomannan in aqueous solutions using fluorescence-based technique. Carbohydr Polym 2021; 267:118183. [PMID: 34119151 DOI: 10.1016/j.carbpol.2021.118183] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 05/04/2021] [Accepted: 05/05/2021] [Indexed: 12/17/2022]
Abstract
Fluorescence probing was used to study hydrophobic interactions of galactomannan (GM) obtained from fenugreek gum (FG), guar gum (GG), and locust bean gum (LBG) at different M/G ratios. The I1/I3 ratio of pyrene changed from 1.73 to 1.29, 1.22, and 1.29 for FG, GG and LBG, respectively, as the concentration of GM increased from 0.01 to 8.0 g/L at 30 °C. The critical aggregation concentration of FG, GG, and LBG increased from 1.04 to 3.84 g/L, 1.15 to 3.73 g/L, and 0.94 to 3.63 g/L, respectively, as temperature increased from 10 to 70 °C. Addition of Na2SO4 and NaSCN increased the I1/I3 ratio in dilute solution, but reduced it in semi-dilute solution, whereas adding urea reduced I1/I3 in dilute solution but increased it in semi-dilute solution. These results indicated that the CAC of GM, polarity and number of hydrophobic microdomains were highly dependent on the M/G ratio and galactose distribution.
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6
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Pullulan derivative with cationic and hydrophobic moieties as an appropriate macromolecule in the synthesis of nanoparticles for drug delivery. Int J Biol Macromol 2020; 164:4487-4498. [PMID: 32946935 DOI: 10.1016/j.ijbiomac.2020.09.064] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 08/28/2020] [Accepted: 09/10/2020] [Indexed: 12/12/2022]
Abstract
A new amphiphilic pullulan derivative (DBAP-PO) was obtained by grafting tertiary butyl amine and octanoyl groups on the pullulan backbone as cationic and hydrophobic moieties, respectively. The structural characteristics of the modified polymer were investigated by FT-IR and 1H and 13C NMR spectroscopy. The self-association ability in aqueous solution of DBAP-PO was studied by viscosity and fluorescence methods. The intrinsic viscosity of the polymer was determined by Wolf model. The critical aggregation concentration (CAC) value of 0.028 g/dL, determined by fluorescence measurements in the presence of pyrene, was confirmed by capillary viscosimetry and dynamic laser scattering (DLS). Dialysis method was used to demonstrate the capacity of the pullulan derivative to form spherical nanoparticles (d ~ 200 nm) loaded with model drug, sodium diclofenac (DF) (74% entrapment efficiency). The DF release was sustained and pH-dependent. In vitro cytotoxicity as well as morphological studies conducted on the human skin fibroblasts showed that DBAP-PO/DF nanoparticles do not exhibit cytotoxic effects at the pharmacologically relevant concentration of DF, maintaining the typical morphology of the cells.
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7
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Amphiphilic polysaccharide based on curdlan: Synthesis and behaviour in aqueous solution. Carbohydr Polym 2019; 224:115157. [DOI: 10.1016/j.carbpol.2019.115157] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 07/12/2019] [Accepted: 08/01/2019] [Indexed: 12/28/2022]
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8
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Wintgens V, Guigner JM, Miskolczy Z, Amiel C, Biczók L. 4-Sulfonatocalixarene-induced nanoparticle formation of methylimidazolium-conjugated dextrans: Utilization for drug encapsulation. Carbohydr Polym 2019; 223:115071. [DOI: 10.1016/j.carbpol.2019.115071] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/06/2019] [Accepted: 07/06/2019] [Indexed: 01/03/2023]
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9
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Dextran derivatives application as flocculants. Carbohydr Polym 2018; 190:162-174. [DOI: 10.1016/j.carbpol.2018.02.075] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 02/08/2018] [Accepted: 02/22/2018] [Indexed: 01/06/2023]
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10
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Dragan ES, Bercea M, Sacarascu L. Tuning the associative properties and micelles geometry by stepwise quaternization of PDMAEMA. REACT FUNCT POLYM 2018. [DOI: 10.1016/j.reactfunctpolym.2018.01.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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11
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Xin C, Chen J, Liang H, Wan J, Li J, Li B. Confirmation and measurement of hydrophobic interaction in sol-gel system of konjac glucomannan with different degree of deacetylation. Carbohydr Polym 2017; 174:337-342. [DOI: 10.1016/j.carbpol.2017.06.088] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 06/04/2017] [Accepted: 06/21/2017] [Indexed: 10/19/2022]
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12
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Zhang P, Xu X, Zhang M, Wang J, Bai G, Yan H. Self-Aggregation of Amphiphilic Dendrimer in Aqueous Solution: The Effect of Headgroup and Hydrocarbon Chain Length. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:7919-7925. [PMID: 25665149 DOI: 10.1021/la504949f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The self-aggregation of amphiphilic dendrimers G1QPAMCm based on poly(amidoamine) PAMAM possessing the same hydrophilic group but differing in alkyl chain length in aqueous solution was investigated. Differences in the chemical structures lead to significant specificities in the aggregate building process. A variety of physicochemical parameters presented monotonous regularity with the increase in alkyl chain length in multibranched structure, as traditional amphiphilic molecules. A significant difference, however, existed in the morphology and the microenvironment of the microdomain of the aggregates, with G1QPAMCm with an alkyl chain length of 16 intending to form vesicles. To obtain supporting information about the aggregation mechanism, the thermodynamic parameters of micellization, the free Gibbs energy ΔGmic, and the entropy ΔSmic were derived subsequently, of which the relationship between the hydrophobic chain length and the thermodynamic properties indicated that the self-assembly process was jointly driven by enthalpy and entropy. Other than traditional surfactants, the contribution of enthalpy has not increased identically to the increase in hydrophobic interactions, which depends on the ratio of the alkyl chain length to the radius in the headgroup. Continuous increases in the hydrophobic chain length from 12 to 16 lead to the intracohesion of the alkyl chain involved in the process of self-assembly, weakening the hydrophobic interactions, and the increase in -ΔHmic, which offers an explanation of the formation of vesicular structures.
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Affiliation(s)
- Pei Zhang
- †Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Xiaohui Xu
- †Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Minghui Zhang
- †Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Jinben Wang
- †Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Guangyue Bai
- ‡School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China
| | - Haike Yan
- †Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
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13
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Constantin M, Asmarandei I, Filimon A, Fundueanu G. Synthesis, characterization, and solution behavior of pullulan functionalized with tertiary amino groups. HIGH PERFORM POLYM 2015. [DOI: 10.1177/0954008315584182] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The synthesis of cationic amphiphilic pullulan having dimethylaminopropyl groups was performed in dimethyl sulfoxide using N, N′-carbonyldiimidazole as activator. The pullulan derivatives with three different substitution degrees were characterized by FTIR, 1H and 13C NMR, elemental analysis, and conductometric titrations. The aggregates characteristics were determined by steady-state fluorescence (critical aggregation concentration and polarity) and capillary viscometry measurements. Their behavior in aqueous dilute and semidilute solutions was investigated by viscosimetric experiments and fluorescence technique over the concentration range of 0.01–10 g dL−1, as a function of the degree of substitution with pendant groups. Intrinsic viscosity determined using Wolf equations provided information on the conformation of polymer chains. The results highlight the appearance of intramolecular and intermolecular aggregates and the dependence of their characteristics on the degree of substitution with pendant groups.
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Affiliation(s)
| | | | - Anca Filimon
- “Petru Poni” Institute of Macromolecular Chemistry, Iasi, Romania
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14
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Lei D, Liu J, Ye F, Chen F, Zhao G. Synthesis, characterization and aqueous self-assembly of octenylsuccinic corn dextrin ester with high molecular weight. Food Hydrocoll 2014. [DOI: 10.1016/j.foodhyd.2014.04.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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Nichifor M, Mocanu G, Stanciu MC. Micelle-like association of polysaccharides with hydrophobic end groups. Carbohydr Polym 2014; 110:209-18. [DOI: 10.1016/j.carbpol.2014.03.072] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Revised: 01/14/2014] [Accepted: 03/20/2014] [Indexed: 11/26/2022]
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16
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17
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Genest S, Schwarz S, Petzold-Welcke K, Heinze T, Voit B. Characterization of highly substituted, cationic amphiphilic starch derivatives: Dynamic surface tension and intrinsic viscosity. STARCH-STARKE 2013. [DOI: 10.1002/star.201200295] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sabine Genest
- Leibniz-Institut für Polymerforschung Dresden e.V.; Dresden Germany
- Organische Chemie der Polymere; Technische Universität Dresden; Dresden Germany
| | - Simona Schwarz
- Leibniz-Institut für Polymerforschung Dresden e.V.; Dresden Germany
| | - Katrin Petzold-Welcke
- Center of Excellence for Polysaccharide Research; Friedrich Schiller University of Jena; Jena Germany
| | - Thomas Heinze
- Center of Excellence for Polysaccharide Research; Friedrich Schiller University of Jena; Jena Germany
| | - Brigitte Voit
- Leibniz-Institut für Polymerforschung Dresden e.V.; Dresden Germany
- Organische Chemie der Polymere; Technische Universität Dresden; Dresden Germany
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18
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Separation of TiO2 particles from water and water/methanol mixtures by cationic dextran derivatives. Carbohydr Polym 2013; 98:1637-43. [DOI: 10.1016/j.carbpol.2013.07.085] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 07/09/2013] [Accepted: 07/26/2013] [Indexed: 11/21/2022]
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19
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Flocculation by cationic amphiphilic polyelectrolyte: Relating efficiency with the association of polyelectrolyte in the initial solution. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.09.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Liu Z, Shang Y, Feng J, Peng C, Liu H, Hu Y. Effect of Hydrophilicity or Hydrophobicity of Polyelectrolyte on the Interaction between Polyelectrolyte and Surfactants: Molecular Dynamics Simulations. J Phys Chem B 2012; 116:5516-26. [DOI: 10.1021/jp212089d] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhenhai Liu
- State Key Laboratory of Chemical
and Engineering and Department of Chemistry, East China University of Science and Technology, Shanghai 200237,
China
| | - Yazhuo Shang
- State Key Laboratory of Chemical
and Engineering and Department of Chemistry, East China University of Science and Technology, Shanghai 200237,
China
| | - Jian Feng
- Department of Chemistry
and
Life Science, Chuzhou University, Anhui
239012, China
| | - Changjun Peng
- State Key Laboratory of Chemical
and Engineering and Department of Chemistry, East China University of Science and Technology, Shanghai 200237,
China
| | - Honglai Liu
- State Key Laboratory of Chemical
and Engineering and Department of Chemistry, East China University of Science and Technology, Shanghai 200237,
China
| | - Ying Hu
- State Key Laboratory of Chemical
and Engineering and Department of Chemistry, East China University of Science and Technology, Shanghai 200237,
China
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21
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Sing CE, Alexander-Katz A. Equilibrium Structure and Dynamics of Self-Associating Single Polymers. Macromolecules 2011. [DOI: 10.1021/ma200830t] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Charles E. Sing
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Alfredo Alexander-Katz
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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22
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Bercea M, Nichifor M, Eckelt J, Wolf BA. Dextran-Based Polycations: Thermodynamic Interaction with Water as Compared With Unsubstituted Dextran, 2 - Flory/Huggins Interaction Parameter. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201100197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Morariu S, Eckelt J, Wolf BA. Dextran-Based Polycations: Thermodynamic Interaction with Water as Compared With Unsubstituted Dextran, 1 - Volumetric Properties and Light Scattering. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201100196] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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24
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Siddique B, Duhamel J. Effect of polypeptide sequence on polypeptide self-assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:6639-50. [PMID: 21542605 DOI: 10.1021/la200676s] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This study represents a unique example where the self-assembly of five amphiphilic polypeptides was monitored as a function of their hydrophilic-to-lipophilic balance (HLB). The HLB was tuned by preparing a series of polypeptides with aspartic acid (Asp) and phenylalanine (Phe) according to the sequence (Asp(x)Phe(y)) where x and y vary from 1 to 3. The self-assembly of the (Asp(x)Phe(y))(n) polypeptides with M(w) values ranging from 8 to 12 K was studied in solution by fluorescence quenching and nonradiative energy transfer (NRET) fluorescence experiments. Dynamic (DLS) and static (SLS) light scattering studies were used to complement the results obtained. The fluorescence quenching experiments conducted with the chromophore pyrene used as a free probe, physically bound to the polypeptides via hydrophobic interactions, demonstrated that the chromophore was less exposed to the solution for the sequences having a higher hydrophobic character. Protective quenching was also observed for those polypeptides randomly labeled with pyrene where the phenylalanine content was high, whereas pyrene was found to be fully exposed to the quencher for the polypeptides having more hydrophilic sequences. NRET used to probe interpolymeric association was not observed between a naphthalene and a pyrene labeled polypeptide for the polypeptide sequences which were richer in aspartic acid, whereas energy transfer took place with the more hydrophobic polypeptides. This observation led to the conclusion that those sequences with a higher content of aspartic acid essentially generate unimolecular polymeric micelles, whereas those with a higher content of phenylalanine generate polymeric aggregates which offer protection from the solvent to their hydrophobic cargo. The presence of these polymeric aggregates was also confirmed by DLS and SLS studies which suggest that species 100-200 nm in diameter are present in solution.
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Affiliation(s)
- Bushra Siddique
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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25
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Bawa P, Pillay V, Choonara YE, du Toit LC, Ndesendo VMK, Kumar P. A composite polyelectrolytic matrix for controlled oral drug delivery. AAPS PharmSciTech 2011; 12:227-38. [PMID: 21225384 DOI: 10.1208/s12249-010-9576-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Accepted: 12/16/2010] [Indexed: 11/30/2022] Open
Abstract
The purpose of this study was to formulate drug-loaded polyelectrolyte matrices constituting blends of pectin, chitosan (CHT) and hydrolyzed polyacrylamide (HPAAm) for controlling the premature solvation of the polymers and modulating drug release. The model drug employed was the highly water-soluble antihistamine, diphenhydramine HCl (DPH). Polyelectrolyte complex formation was validated by infrared spectroscopy. Matrices were characterized by textural profiling, porositometry and SEM. Drug release studies were performed under simulated gastrointestinal conditions using USP apparatus 3. FTIR spectra revealed distinctive peaks indicating the presence of -COO(-) symmetrical stretching (1,425-1,390 cm(-1)) and -NH (3) (+) deformation (1,535 cm(-1)) with evidence of electrostatic interaction between the cationic CHT and anionic HPAAm corroborated by molecular mechanics simulations of the complexes. Pectin-HPAAm matrices showed electrostatic attraction due to residual -NH(2) and -COO(-) groups of HPAAm and pectin, respectively. Textural profiling demonstrated that CHT-HPAAm matrices were most resilient at 6.1% and pectin-CHT-HPAAm matrices were the least (3.9%). Matrix hardness and deformation energy followed similar behavior. Pectin-CHT-HPAAm and CHT-HPAAm matrices produced type IV isotherms with H3 hysteresis and mesopores (22.46 nm) while pectin-HPAAm matrices were atypical with hysteresis at a low P/P(0) and pore sizes of 5.15 nm and a large surface area. At t (2 h), no DPH was released from CHT-HPAAm matrices, whereas 28.2% and 82.2% was released from pectin-HPAAm and pectin-CHT-HPAAm matrices, respectively. At t (4 h), complete DPH release was achieved from pectin-CHT-HPAAm matrices in contrast to only 35% from CHT-HPAAm matrices. This revealed the release-modulating capability of each matrix signifying their applicability in controlled oral drug delivery applications.
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26
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Prado HJ, Matulewicz MC, Bonelli PR, Cukierman AL. Studies on the cationization of agarose. Carbohydr Res 2011; 346:311-21. [DOI: 10.1016/j.carres.2010.12.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Revised: 11/29/2010] [Accepted: 12/03/2010] [Indexed: 11/26/2022]
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27
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Ghimici L, Nichifor M. Novel biodegradable flocculanting agents based on cationic amphiphilic polysaccharides. BIORESOURCE TECHNOLOGY 2010; 101:8549-8554. [PMID: 20637601 DOI: 10.1016/j.biortech.2010.06.049] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 05/21/2010] [Accepted: 06/04/2010] [Indexed: 05/29/2023]
Abstract
Flocculation properties of a series of cationic polysaccharides, with N-alkyl-N,N-dimethyl-N-(2-hydroxypropyl)ammonium chloride pendent groups attached to a dextran backbone, were evaluated in clay dispersions with respect to length of the alkyl substituent, molar mass, the charge density, and polycation dose. According to turbidimetric results, the alkyl chain length greatly influenced the optimum polymer dose as well as the width of the flocculation window since both increased from an ethyl to a butyl group and decreased for when octyl or dodecyl group was present. The residual turbidity values also varied with the charge density but no dramatic effect was observed with the molar masses investigated. These findings together with the negative value of the zeta potential at the optimum polymer dose and floc size measurements, point to contributions from both patch and bridging mechanisms for the flocculation process.
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Affiliation(s)
- Luminita Ghimici
- Petru Poni Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, Iasi, Romania.
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28
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Bai G, Nichifor M, Bastos M. Cationic Polyelectrolytes as Drug Delivery Vectors: Calorimetric and Fluorescence Study of Rutin Partitioning. J Phys Chem B 2010; 114:16236-43. [DOI: 10.1021/jp1071555] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guangyue Bai
- CIQ (UP), Department of Chemistry, Faculty of Sciences, University of Porto, R. Campo Alegre, 687, P-4169-007 Porto, Portugal, and “Petru Poni” Institute of Macromolecular Chemistry, 700487 Iasi, Romania
| | - Marieta Nichifor
- CIQ (UP), Department of Chemistry, Faculty of Sciences, University of Porto, R. Campo Alegre, 687, P-4169-007 Porto, Portugal, and “Petru Poni” Institute of Macromolecular Chemistry, 700487 Iasi, Romania
| | - Margarida Bastos
- CIQ (UP), Department of Chemistry, Faculty of Sciences, University of Porto, R. Campo Alegre, 687, P-4169-007 Porto, Portugal, and “Petru Poni” Institute of Macromolecular Chemistry, 700487 Iasi, Romania
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29
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30
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Li R, Wei L, Hu C, Xu C, Wang J. Aggregation Properties of a Novel Class of Amphiphilic Cationic Polyelectrolytes Containing Gemini Surfactant Segments. J Phys Chem B 2010; 114:12448-54. [DOI: 10.1021/jp102685w] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rongqiang Li
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, People’s Republic of China, and Key Laboratory of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Lubin Wei
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, People’s Republic of China, and Key Laboratory of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Changchao Hu
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, People’s Republic of China, and Key Laboratory of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Chengfeng Xu
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, People’s Republic of China, and Key Laboratory of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Jinben Wang
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, People’s Republic of China, and Key Laboratory of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
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31
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Nichifor M, Stanciu MC, Simionescu BC. Fluorescence Study of Intermolecular Interactions in Diluted Aqueous Solutions of Some Cationic Amphiphilic Polysaccharides. J MACROMOL SCI B 2010. [DOI: 10.1080/00222341003609807] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Marieta Nichifor
- a “Petru Poni” Institute of Macromolecular Chemistry , Aleea Grigore Ghica Voda , Iasi, Romania
| | | | - Bogdan C. Simionescu
- a “Petru Poni” Institute of Macromolecular Chemistry , Aleea Grigore Ghica Voda , Iasi, Romania
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32
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Souguir Z, Roudesli S, About-Jaudet E, Picton L, Le Cerf D. Novel cationic and amphiphilic pullulan derivatives II: pH dependant physicochemical properties. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2009.11.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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33
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Ghimici L, Bercea M, Dragan ES. Rheological Behavior of Some Cationic Polyelectrolytes. J MACROMOL SCI B 2009. [DOI: 10.1080/00222340903035618] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Luminita Ghimici
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
| | - Maria Bercea
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
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34
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35
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Kaya A, Du X, Liu Z, Lu JW, Morris JR, Glasser WG, Heinze T, Esker AR. Surface Plasmon Resonance Studies of Pullulan and Pullulan Cinnamate Adsorption onto Cellulose. Biomacromolecules 2009; 10:2451-9. [DOI: 10.1021/bm900412g] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Abdulaziz Kaya
- Department of Chemistry and Department of Wood Science and Forest Products, Virginia Tech, Blacksburg, Virginia 24061, and Center of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstraβe 10, Jena, 07743 Germany
| | - Xiaosong Du
- Department of Chemistry and Department of Wood Science and Forest Products, Virginia Tech, Blacksburg, Virginia 24061, and Center of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstraβe 10, Jena, 07743 Germany
| | - Zelin Liu
- Department of Chemistry and Department of Wood Science and Forest Products, Virginia Tech, Blacksburg, Virginia 24061, and Center of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstraβe 10, Jena, 07743 Germany
| | - Jessica W. Lu
- Department of Chemistry and Department of Wood Science and Forest Products, Virginia Tech, Blacksburg, Virginia 24061, and Center of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstraβe 10, Jena, 07743 Germany
| | - John R. Morris
- Department of Chemistry and Department of Wood Science and Forest Products, Virginia Tech, Blacksburg, Virginia 24061, and Center of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstraβe 10, Jena, 07743 Germany
| | - Wolfgang G. Glasser
- Department of Chemistry and Department of Wood Science and Forest Products, Virginia Tech, Blacksburg, Virginia 24061, and Center of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstraβe 10, Jena, 07743 Germany
| | - Thomas Heinze
- Department of Chemistry and Department of Wood Science and Forest Products, Virginia Tech, Blacksburg, Virginia 24061, and Center of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstraβe 10, Jena, 07743 Germany
| | - Alan R. Esker
- Department of Chemistry and Department of Wood Science and Forest Products, Virginia Tech, Blacksburg, Virginia 24061, and Center of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstraβe 10, Jena, 07743 Germany
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36
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Ghimici L, Nichifor M, Wolf B. Ionic Polymers Based on Dextran: Hydrodynamic Properties in Aqueous Solution and Solvent Mixtures. J Phys Chem B 2009; 113:8020-5. [DOI: 10.1021/jp900690f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luminita Ghimici
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania, and Institute of Physical Chemistry, University of Mainz, Welder-Weg 13, D-55099 Mainz, Germany
| | - Marieta Nichifor
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania, and Institute of Physical Chemistry, University of Mainz, Welder-Weg 13, D-55099 Mainz, Germany
| | - Bernhard Wolf
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania, and Institute of Physical Chemistry, University of Mainz, Welder-Weg 13, D-55099 Mainz, Germany
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37
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Srivastava A, Waite JH, Stucky GD, Mikhailovsky A. Fluorescence Investigations into Complex Coacervation between Polyvinylimidazole and Sodium Alginate. Macromolecules 2009; 42:2168-2176. [PMID: 20808713 PMCID: PMC2929675 DOI: 10.1021/ma802174t] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Electrostatic interactions between the imidazole-based cationic homopolymer, polyvinylimidazole (PVIm), and anionic polysaccharide, sodium alginate, lead to the formation of colloidal aggregates known as complex coacervates in the pH range 4-6.5. PVIm was labeled with the fluorescent reporter pyrene to investigate the coacervation-induced changes in and around PVIm chains. While the pyrene-tagged PVIm had blue fluorescence in water, the coacervate phase exhibited an additional broad band around 492 nm (green) due to formation of pyrene excimers. Fluorescence spectroscopic investigations point toward aggregation of PVIm chains and desolvation upon coacervation. Highly anisotropic fluorescence emission indicates tight packing of the polymer chains in the coacervate. Confocal microscopy of fluorescein-labeled alginate and rhodamine-labeled PVIm shows coacervates as dense aggregates with uniform distribution of the polymers. Fluorescence spectroscopy offers sensitive and easy investigation into polyelectrolyte interactions.
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Affiliation(s)
- Aasheesh Srivastava
- Molecular Cellular and Developmental Biology, University of California, Santa Barbara, California 93106
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38
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Filippov SK, Komolov AS, Sergeeva OY, Olifirenko AS, Lesnichin SB, Komarova EA, Loginov BA, Domnina NS, Lezov AV. Aggregation of dextran hydrophobically modified by sterically hindered phenols. POLYMER SCIENCE SERIES A 2009. [DOI: 10.1134/s0965545x09020035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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39
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Chakraborty T, Chakraborty I, Moulik SP, Ghosh S. Physicochemical and conformational studies on BSA-surfactant interaction in aqueous medium. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:3062-74. [PMID: 19437713 DOI: 10.1021/la803797x] [Citation(s) in RCA: 168] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
In this paper, results of physicochemical studies on the interaction of bovine serum albumin (BSA) with alkyltrimethylammonium bromide (ATAB), pentaethylene glycol mono-n-dodecyl ether (C12E5), and sodium dodecyl sulfate (SDS) under the experimental conditions of phosphate buffer at pH 7 in the presence of 10 mM sodium bromide (NaBr), maintaining the ionic strength of the overall solution at micro = 0.015 M, have been presented and discussed. Here, BSA-ATAB corresponds to a polyion-surfactant system bearing opposite charges. BSA precipitated out of the solution on addition of ATAB solution over a certain range of ATAB concentration, the concentration range being dependent on the particular member of the ATAB family. In our earlier reports on the precipitation of oppositely charged polymer-surfactant, the tensiometric profile for surfactant addition in polymer solution differed significantly from that expected from addition of surfactant in the dispersion medium. In the present study, the precipitation process could hardly affect the smoothness of the tensiometric profile. This indicates the interaction process is operative in bulk solution. Microcalorimetric profiles also evidenced an extra hump in the interaction profile at lower surfactant concentrations, without much affecting the dilution enthalpograms beyond micellization. This interaction appeared unimodal and the extent of interaction increased with increasing tail length of ATAB, evidencing the hydrophobic effect to be an important factor. Addition of salt (NaBr) also affected the nature of interaction: at lower concentration of NaBr, the interaction was mildly assisted, whereas 50 mM NaBr fairly assisted the interaction. The nonionic surfactant C12E5 modestly interacted with BSA. The anionic amphiphile SDS, on the other hand, interacted with BSA in two distinctly different stages, as evidenced from the tensiometric profile. The complexity of the BSA-SDS tensiometric isotherm compared to that of BSA-ATAB arose from the presence of cationic binding sites adjacent to hydrophobic patches of BSA in its native state, so that electrostatic and hydrophobic interactions can cooperatively operate side by side. The interfacial saturation occurred at a lower concentration in the presence of BSA compared to the normal cmc of SDS under identical solution conditions in the absence of BSA, which was slightly delayed for nonionic C12E5. The multitechnique approach evidenced that different experimental techniques probe different physicochemical phenomena and an attempt to show the concurrence of the break points in different techniques is only diluting the essence of this area.
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Affiliation(s)
- Tanushree Chakraborty
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata-700 032, India
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40
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Dutta P, Dey J, Ghosh G, Nayak RR. Self-association and microenvironment of random amphiphilic copolymers of sodium N-acryloyl-l-valinate and N-dodecylacrylamide in aqueous solution. POLYMER 2009. [DOI: 10.1016/j.polymer.2008.12.049] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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41
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Ghimici L, Nichifor M. Transport properties of some cationic amphiphilic polysaccharides: Effects of the side-chain length and solvent polarity. J Appl Polym Sci 2009. [DOI: 10.1002/app.29370] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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42
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Affiliation(s)
- Luminita Ghimici
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
| | - Marieta Nichifor
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
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43
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Nichifor M, Bastos M, Lopes S, Lopes A. Characterization of Aggregates formed by Hydrophobically Modified Cationic Dextran and Sodium Alkyl Sulfates in Salt-Free Aqueous Solutions. J Phys Chem B 2008; 112:15554-61. [DOI: 10.1021/jp802543s] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marieta Nichifor
- “Petru Poni” Institute of Macromolecular Chemistry, 700487 Iasi, Romania, Instituto de Tecnologia Quimica e Biologica (ITQB/UNL), P-2781-901 Oeiras, Portugal, and CIQ (UP), Department of Chemistry, Faculty of Sciences, University of Porto, P-4169-007 Porto, Portugal
| | - Margarida Bastos
- “Petru Poni” Institute of Macromolecular Chemistry, 700487 Iasi, Romania, Instituto de Tecnologia Quimica e Biologica (ITQB/UNL), P-2781-901 Oeiras, Portugal, and CIQ (UP), Department of Chemistry, Faculty of Sciences, University of Porto, P-4169-007 Porto, Portugal
| | - Sonia Lopes
- “Petru Poni” Institute of Macromolecular Chemistry, 700487 Iasi, Romania, Instituto de Tecnologia Quimica e Biologica (ITQB/UNL), P-2781-901 Oeiras, Portugal, and CIQ (UP), Department of Chemistry, Faculty of Sciences, University of Porto, P-4169-007 Porto, Portugal
| | - Antonio Lopes
- “Petru Poni” Institute of Macromolecular Chemistry, 700487 Iasi, Romania, Instituto de Tecnologia Quimica e Biologica (ITQB/UNL), P-2781-901 Oeiras, Portugal, and CIQ (UP), Department of Chemistry, Faculty of Sciences, University of Porto, P-4169-007 Porto, Portugal
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44
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45
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Filippov SK, Lezov AV, Sergeeva OY, Olifirenko AS, Lesnichin SB, Domnina NS, Komarova EA, Almgren M, Karlsson G, Štepanek P. Aggregation of dextran hydrophobically modified by sterically-hindered phenols in aqueous solutions: Aggregates vs. single molecules. Eur Polym J 2008. [DOI: 10.1016/j.eurpolymj.2008.07.041] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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46
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Lu HW, Zhang LM, Liu JY, Chen RF. Synthesis of an Amphiphilic Polysaccharide Derivative and Its Micellization for Drug Release. J BIOACT COMPAT POL 2008. [DOI: 10.1177/0883911507088272] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A new route for the synthesis of novel amphiphilic polysaccharides was developed, in which a synthetic biodegradable poly(ε-caprolactone) was capped with a phenylalanine group (PCL-phenylalanine). The ring-opening polymerization of ε-caprolactone (ε-CL) was carried out in the absence of a metal catalyst with L-phenylalanine as the initiator; this was followed by a coupling reaction with biodegradable dextran in the presence of carbonyldimidazole. The FTIR and 1H NMR analyses confirm the coupling reaction. Fluorescence, transmission electron microscopy (TEM), and dynamic light scattering (DLS) confirm that in aqueous solution the amphiphilic polysaccharides self-assemble into the nanoscale spherical micelles with good stability. The in vitro drug release behavior of the nonsteroidal indomethacin drug exhibits sustained drug release profile as described by the Higuchi model without a burst effect.
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Affiliation(s)
- Hong-Wei Lu
- School of Chemistry and Chemical Engineering and Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, China
| | - Li-Ming Zhang
- School of Chemistry and Chemical Engineering and Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, China,
| | - Ji-Yan Liu
- School of Chemistry and Chemical Engineering and Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, China
| | - Ru-Fu Chen
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital Sun Yet-sen (Zhongshan) University, Guangzhou 510120, China
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47
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Souguir Z, Roudesli S, Picton E, Le Cerf D, About-Jaudet E. Novel cationic and amphiphilic pullulan derivatives I: Synthesis and characterization. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2007.09.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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48
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Bai G, Catita JAM, Nichifor M, Bastos M. Microcalorimetric Evidence of Hydrophobic Interactions between Hydrophobically Modified Cationic Polysaccharides and Surfactants of the Same Charge. J Phys Chem B 2007; 111:11453-62. [PMID: 17824638 DOI: 10.1021/jp073530r] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We synthesized and characterized a series of new polymers-hydrophobically modified cationic polysaccharides-based on dextran having pendant N-(2-hydroxypropyl)-N,N-dimethyl-N-alkylammonium chloride groups randomly distributed along the polymer backbone. These polymers are good candidates for studying the hydrophobic effect on polymer/surfactant association. In previous papers we reported their interactions with oppositely charged surfactants. For further insight into the relative importance of the hydrophobic interaction in the association process now we studied the thermodynamics of the interaction of these hydrophobically modified polymers with surfactants of the same charge (DMRX/CnTAC) by isothermal titration calorimetry (ITC). In order to try to discriminate the solution behavior of these polymer/surfactant systems, we analyzed separately the interaction of unmodified dextran with ionic surfactants and the interactions between the corresponding cationic surfactants. The interaction enthalpies for DMRX/CnTAC systems were derived from a proposed thermodynamic model with equations that describe the polymer-surfactant interactions. The thermodynamic parameters for the DMRX/CnTAC aggregation process as well as surfactant micellization in the presence of the polymer were also calculated. From all the results we were able to ascertain the effect on the interactions of changing the alkyl chain length of the polyelectrolyte pendant groups or the surfactant. The importance of the polymer aggregation state on the mechanism of interaction was also addressed.
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Affiliation(s)
- Guangyue Bai
- CIQ (UP), Department of Chemistry, Faculty of Sciences, University of Porto, R. Campo Alegre, 687, P-4169-007 Porto, Portugal
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49
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Akiyama E, Yamamoto T, Yago Y, Hotta H, Ihara T, Kitsuki T. Thickening properties and emulsification mechanisms of new derivatives of polysaccharide in aqueous solution. J Colloid Interface Sci 2007; 311:438-46. [PMID: 17448488 DOI: 10.1016/j.jcis.2007.03.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2006] [Revised: 03/04/2007] [Accepted: 03/07/2007] [Indexed: 11/18/2022]
Abstract
The thickening properties and association behavior of aqueous solutions of HHM-HEC (hydrophobically-hydrophilically modified hydroxyethyl cellulose) with various hydrophobic and hydrophilic substitution degrees were investigated. The HHM-HEC was used as an oil-in-water emulsifier and stable compositional regions were investigated as a function of polymer concentration and substitution degree. The viscosity of aqueous solutions of HHM-HEC increased drastically at lower concentration for HHM-HEC with a higher hydrophobic/hydrophilic substitution ratio. The intensity ratio of the first and third vibrational bands of pyrene (I(1)/I(3)) decreased with the increase of HHM-HEC concentration and the I(1)/I(3) reached a lower plateau at a lower concentration for HHM-HEC with a higher hydrophobic/hydrophilic substitution ratio. The concentration ranges of HHM-HEC solutions which stabilize O/W emulsions differ by the hydrophobic/hydrophilic substitution ratio. However the viscosity ranges of these HHM-HEC solutions were almost the same regardless of the hydrophobic/hydrophilic substitution ratio. At the suitable concentration range for emulsification, HHM-HEC networks have two properties: (1) oil particle retention capacity and (2) laxation which can trap emulsified particles.
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Affiliation(s)
- Eri Akiyama
- Kao Corporation, Tokyo Research Lab., 2-1-3 Bunka, Sumidaku, Tokyo 131-8501, Japan.
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50
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Cavalieri F, Chiessi E, Paradossi G. Chaperone-like activity of nanoparticles of hydrophobized poly(vinyl alcohol). SOFT MATTER 2007; 3:718-724. [PMID: 32900134 DOI: 10.1039/b618779j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Amphiphilic poly(vinyl alcohol) randomly grafted with hydrophobic methacryloyl groups can form micelle-like particles by intra and interpolymeric association. Self-aggregation behaviour of the hydrophobically-modified polymer was investigated. The hydrophobized nanoparticles assist carbonic anhydrase B (CAB) refolding in a manner similar to the mechanism of molecular chaperones, namely by catching and releasing the protein. Irreversible CAB thermal denaturation is prevented by nanoparticle complexation and recovery of almost 100% of enzymatic activity is triggered by the ability of β-cyclodextrin to interact with the hydrophobic moieties. Structural and functional properties of micelle-like particles were discussed and interpreted in view of the stability and architecture of hydrophobic nanodomains.
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Affiliation(s)
- Francesca Cavalieri
- Dipartimento di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy.
| | - Ester Chiessi
- Dipartimento di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy.
| | - Gaio Paradossi
- Dipartimento di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy.
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