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mixed micelles

Xiaomeng Wan, Yuanzeng Min, Herdis Bludau, Andrew Keith, Sergei S Sheiko, Rainer Jordan, Andrew Z Wang, Marina Sokolsky-Papkov, Alexander V Kabanov
Nanoparticle-based systems for concurrent delivery of multiple drugs can improve outcomes of cancer treatments, but face challenges because of differential solubility and fairly low threshold for incorporation of many drugs. Here we demonstrate that this approach can be used to greatly improve the treatment outcomes of etoposide (ETO) and platinum drug combination ("EP/PE") therapy that is the backbone for treatment of prevalent and deadly small cell lung cancer (SCLC). A polymeric micelle system based on amphiphilic block copolymer poly(2-oxazoline)s (POx) poly(2-methyl-2-oxazoline-block-2-butyl-2-oxazoline-block-2-methyl-2-oxazoline) (P(MeOx-b-BuOx-b-MeOx) is used along with an alkylated cisplatin prodrug to enable co-formulation of EP/PE in a single high-capacity vehicle...
March 13, 2018: ACS Nano
Svetlana S Efimova, Evgeny G Chulkov, Olga S Ostroumova
The effects of local anesthetics (LAs), namely, lidocaine (LDC), prilocaine (PLC), mepivacaine (MPV), bupivacaine (BPV), procaine (PC), and tetracaine (TTC), on the steady-state transmembrane conductance induced by the cis-side addition of the antifungal polyene macrolide antibiotic, nystatin (NYS), in planar lipid bilayers were studied. The addition of TTC to model membranes comprising DOPC and cholesterol (33 mol%) led to a nearly twenty-fold increase in the steady-state NYS-induced membrane conductance...
March 8, 2018: Colloids and Surfaces. B, Biointerfaces
Rupam Dutta, Sangita Kundu, Nilmoni Sarkar
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...
March 8, 2018: Biophysical Reviews
Hui-Lin Chen, Chen-Chen Cai, Jun-Yuan Ma, Mei-Ling Yu, Mei-Hui Zhao, Jian-Bo Guo, Hui Xu
The objective of this study was to investigate the effect of dispersion states of azone in gels on the transdermal permeation of levamisole hydrochloride (LH). LH hydro-alcoholic gels containing azone of different dispersion states were prepared by varying the contents of azone and Tween80, and the in vitro transdermal permeation of LH across excised rat skin was evaluated. Depending on the content of azone, mixed solvents and solubilizer used, azone presented as dissolved molecules, solubilized in micelles, and fine or coarse emulsion droplets in gels...
March 5, 2018: Journal of Pharmaceutical Sciences
Linlin Miao, Jia Su, Xuezhi Zhuo, Lifeng Luo, Yihan Kong, Jingxin Gou, Tian Yin, Yu Zhang, Haibing He, Xing Tang
The clinical application of disulfiram (DSF) in cancer treatments is hindered by its rapid degradation in the blood circulation. In this study, methoxy poly(ethyleneglycol)-b-poly(lactide-co-glycolide)/poly(ε-caprolactone) (mPEG5k-b-PLGA2k/PCL3.4k) micelles were developed for encapsulation of DSF -by using the emulsification-solvent diffusion method. Medium chain triglyceride (MCT) was incorporated into the mixed polymeric micelles to improve drug loading by reducing the core crystallinity. Differential scanning calorimetry (DSC) results implied that DSF is likely present in an amorphous form within the micelles, and is well dispersed...
March 5, 2018: Molecular Pharmaceutics
Amy Y Xu, Ebru Kizilay, Slawomir P Madro, Justin Z Vadenais, Kianan W McDonald, Paul L Dubin
"Self-suppression", the instability of complex coacervates at high concentration, is well-known for polycation-polyanion systems, but the transient nature of those complexes impedes development of a convincing model. The stable polyelectrolyte-micelle complexes of the polycation poly(diallyldimethylammonium chloride) (PDADMAC) with mixed micelles of sodium dodecyl sulfate (SDS)/Triton X-100 (TX100); and the stable complexes of PDADMAC with bovine serum albumin (BSA) can be characterized and identified as coacervate precursors...
March 5, 2018: Soft Matter
Jiao Wang, Qiang Liu, Linnan Yang, Xiaofei Xia, Rongrong Zhu, Shengguang Chen, Mei Wang, Liming Cheng, Xianzheng Wu, Shilong Wang
Cervical cancer is the fourth most common cancer in women worldwide, and existing treatments cause severe side effects and great burdens. Thus, the development of safe, inexpensive therapeutic agents is necessary. Curcumin (Cur), a well-known natural product, exerts promising anti-cancer activities against various cancer types. However, its therapeutic efficacy is severely restrained due to rapid degradation, poor aqueous solubility, and low bioavailability. The objective of this study was to investigate the therapeutic potential of novel curcumin-loaded TPGS/F127/P123 mixed polymeric micelles (Cur@NPT100) for cervical cancer treatment...
December 1, 2017: Journal of Biomedical Nanotechnology
Hai-Xia Lin, Ming-Sheng Yang, Chao Tian, Chun-Rui Han, Jie Song, Jiu-Fang Duan, Jian-Xin Jiang
A novel rosin-based ester tertiary amine (RETA) with three hydrophilic groups and a rigid hydrophobic group was synthesized from rosin by Diels-Alder addition, acylation and esterification reactions. RETA was characterized by infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance spectroscopy (13 C NMR). Results from testing surface tension, zeta potential, and transmission electron spectroscopy showed that RETA had unique pH responsiveness. RETA self-assembled into worm-like micelles, spherical micelles 130 nm in diameter and big spherical worm-like aggregates with diameter of 2 μm at pH = 5...
January 31, 2018: Colloids and Surfaces. B, Biointerfaces
Joana Corte-Real, Torsten Bohn
Several divalent minerals, including the macroelements calcium and magnesium, are essential nutrients for humans. However, their intake, especially via high-dose supplements, has been suspected to reduce the availability of lipophilic dietary constituents, including lipids, liposoluble vitamins, and several phytochemicals such as carotenoids. These constituents require emulsification in order to be bioavailable, and high divalent mineral concentrations may perturb this process, due to precipitations of free fatty acids or bile salt complexation, both pivotal for mixed micelle formation...
June 30, 2018: Food Chemistry
Animesh Pan, Subhash C Bhattacharya, Animesh K Rakshit, Satya P Moulik
Development of stable self-assembled nanostructures (especially vesicles and liposomes), and understanding their physicochemical behaviors in aqueous solution is a long-standing topic of interest in chemical and biochemical research. In this progressive area, we report for the first-time formation of mixed micelles (at pH 12), and vesicles of anionic bolaamphiphiles (dicarboxylic acids viz. [Formula: see text] , with moderate values of n 10, 11, 12, and 14) in combination with a cationic surfactant decyltrimethylammonium bromide (C10 TAB) in buffered aqueous medium at different pH (6...
February 8, 2018: Journal of Colloid and Interface Science
Jin-Ping Zha, Meng-Ting Zhu, Li Qin, Xin-Hong Wang
The interactions between Orange G (OG) with three kinds of ionic liquid surfactants (C 10 mimBF 4 , C 12 mimBF 4 , C 16 mimBF 4 ) and CTAB were studied with UV-Vis spectra and conductivity measurements. The systematic changes in UV-Vis spectra with an increase of carbon-chain length may be observed in presence of OG. They correspond to CMC of every system, respectively, and the CMCs of four systems have exhibit the decrease of CMCs compared to pure surfactant. The binding constants are calculated from the results of conductivity measurements in the order of C 16 mimBF 4 >CTAB>C 12 mimBF 4 >C 10 mimBF 4 ...
February 6, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Jing Lin, Chaoyue Zhao, Cuijuan Liu, Shiyao Fu, Luying Han, Xinping Lu, Chunrong Yang
Introduction: The development of nanodrug carriers utilizing tumor microenvironment has become a hotspot in reversing multidrug resistance (MDR). Materials and methods: This study synthesized a redox-sensitive copolymer, Pluronic F127-disulfide bond-d-α-tocopheryl polyethylene glycol 1000 succinate (FSST), through the connection of the reduction-sensitive disulfide bond between F127 and d-α-tocopheryl polyethylene glycol 1000 succinate. This polymer could induce the elevation of reactive oxygen species (ROS) levels, ultimately resulting in cytotoxicity...
2018: International Journal of Nanomedicine
Hongxue Shen, Sheng Liu, Pinggang Ding, Lulu Wang, Jianming Ju, Guohui Liang
OBJECTIVES: We aimed to prepare novel magnolol-loaded mixed micelles (MAG-M) by pluronic F127 and L61 to overcome the challenges of magnolol's poor solubility and then further improve its oral bioavailability. METHODS: Magnolol-loaded mixed micelles containing pluronic F127 and L61 were prepared by an organic solvent evaporation method. Physicochemical, transport experiment across Caco-2 cell monolayers and pharmacokinetic studies were performed to characterize MAG-M and to determine the final improvement of the oral bioavailability...
February 12, 2018: Journal of Pharmacy and Pharmacology
Johannes Eckstein, Hermann-Georg Holzhütter, Nikolaus Berndt
Alternative models exist explaining the biliary lipid secretion at the canalicular membrane of hepatocytes: Successive lipid extraction by preformed bile salt micelles or budding of membrane fragments with formation of mixed micelles. To test the feasibility of the latter mechanism, we developed a mathematical model that describes the formation of lipid microdomains in the canalicular membrane. Bile salt monomers intercalate into the external hemileaflet of the canalicular membrane, to rim liquid disordered domain patches which then pinch off to form nanometer-scale mixed micelles...
February 2, 2018: Journal of Cell Science
Marat I Kamalov, Trinh Đặng, Natalia V Petrova, Alexander V Laikov, Duong Luong, Rezeda A Akhmadishina, Andrei N Lukashkin, Timur I Abdullin
A new self-assembled formulation of methylprednisolone succinate (MPS) based on a carboxylated trifunctional block copolymer of ethylene oxide and propylene oxide (TBC-COOH) was developed. TBC-COOH and MPS associated spontaneously at increased concentrations in aqueous solutions to form almost monodisperse mixed micelles (TBC-COOH/MPS) with a hydrodynamic diameter of 19.6 nm, zeta potential of -27.8 mV and optimal weight ratio ∼1:6.3. Conditions for the effective formation of TBC-COOH/MPS were elucidated by comparing copolymers and glucocorticoids with different structure...
January 11, 2018: Colloids and Surfaces. B, Biointerfaces
Charles Desmarchelier, Véronique Rosilio, David Chapron, Ali Makky, Damien P Prévéraud, Estelle Devillard, Véronique Legrand-Defretin, Patrick Borel
Cholecalciferol (D3) and retinyl palmitate (RP) are the two main fat-soluble vitamins found in foods from animal origin. It is assumed that they are solubilized in mixed micelles prior to their uptake by intestinal cells, but only scarce data are available on the relative efficiency of this process and the molecular interactions that govern it. The extent of solubilization of D3 and RP in micelles composed of lipids and sodium taurocholate (NaTC) was determined. Then, the molecular interactions between components were analyzed by surface tension and surface pressure measurements...
June 1, 2018: Food Chemistry
Wessam H Abd-Elsalam, Sally A El-Zahaby, Abdulaziz M Al-Mahallawi
The aim of the current study was to formulate terconazole (TCZ) loaded polymeric mixed micelles (PMMs) incorporating Cremophor EL as a stabilizer and a penetration enhancer. A 23 full factorial design was performed using Design-Expert® software for the optimization of the PMMs which were formulated using Pluronic P123 and Pluronic F127 together with Cremophor EL. To confirm the role of Cremophor EL, PMMs formulation lacking Cremophor EL was prepared for the purpose of comparison. Results showed that the optimal PMMs formulation (F7, where the ratio of total Pluronics to drug was 40:1, the weight ratio of Pluronic P123 to Pluronic F127 was 4:1, and the percentage of Cremophor EL in aqueous phase was 5%) had a high micellar incorporation efficiency (92...
November 2018: Drug Delivery
Hui Xu, Peixun Li, Kun Ma, Rebecca J L Welbourn, James Doutch, Jeffrey Penfold, Robert K Thomas, David W Roberts, Jordan T Petkov, Ken Loon Choo, Soo Yee Khoo
The α-methyl ester sulfonate, MES, anionic surfactants are a potentially important class of sustainable surfactants for a wide range of applications. The eutectic-like Kraft point minimum in the C16 and C18-MES mixtures is an important feature of that potential. Understanding their individual adsorption properties and the surface mixing of the eutectic mixtures are key to their wider exploitation. Neutron reflectivity has been used to investigate the adsorption at the air-water interface of the C16 and C18-MES surfactants and the eutectic mixture of C16 and C18-MES, in aqueous solution and in electrolyte...
January 30, 2018: Journal of Colloid and Interface Science
Y Li, H S Joyner Melito, B G Carter, M A Drake
Fluid milk may be pasteurized by high-temperature short-time pasteurization (HTST) or ultrapasteurization (UP). Literature suggests that UP increases milk astringency, but definitive studies have not demonstrated this effect. Thus, the objective of this study was to determine the effects of pasteurization method, fat content, homogenization pressure, and storage time on milk sensory and mechanical behaviors. Raw skim (<0.2% fat), 2%, and 5% fat milk was pasteurized in duplicate by indirect UP (140°C, 2...
February 2, 2018: Journal of Dairy Science
Meng Chen, Ruimiao Chang, Liying Xu, Yayun Huang, Hongfen Zhang, Anjia Chen
INTRODUCTION: Praeruptorin A, B and C are major bioactive constituents in Peucedani Radix. They display anti-inflammatory effect, anti-hypertension effect, antiplatelet aggregation, potential anti-cancer activities and so on. They are worthy of investigation as potentially novel and versatile drugs. OBJECTIVE: To develop a method using micellar electrokinetic chromatography (MEKC) for the application in simultaneously separation and determination of praeruptorin A, B and C from Peucedani Radix and its medicinal preparations...
February 2, 2018: Phytochemical Analysis: PCA
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