نتایج جستجو برای: microemulsions

تعداد نتایج: 977  

2011
Catherine E. Nicholson Sharon J. Cooper

Recently we showed how crystallization in microemulsions could lead directly to the most stable polymorph, thereby leapfrogging Ostwald’s rule of stages. Here we consider in more details the crystallization of mefenamic acid from dimethylformamide microemulsions. Crystallization of mefenamic acid from bulk DMF has previously been shown to produce only the metastable Form II irrespective of the ...

Journal: :Acta pharmaceutica 2017
Vaida Juškaitė Kristina Ramanauskienė Vitalis Briedis

Resveratrol is well known for its antioxidant activity and susceptibility to ultraviolet radiation. Development of formulations providing improved stability and relevant drug delivery of resveratrol is still a challenging task. The aim of this study was to determine protective characteristics of formulated microemulsions by evaluating photoisomerization of resveratrol and to investigate the eff...

2005
Eva Rodil Maen M. Husein Juan H. Vera

Nanoparticles of silver halides are widely used to study the quantum confinement effects in indirect band gap semiconductors [1]. These particles are typically prepared by carrying out a precipitation reaction in the water pools of w/o microemulsions, or reverse micelles, by mixing two identical microemulsions containing aqueous solutions of AgNO3 and KBr, or other halides [2]. The mixing of tw...

Journal: :Physical chemistry chemical physics : PCCP 2010
Rajib Pramanik Souravi Sarkar Chiranjib Ghatak Palash Setua Nilmoni Sarkar

The effect of a polymer, polyethylene glycol with a molecular weight of 400 (PEG-400), on the dynamics of solvent and rotational relaxation have been investigated in [bmim][BF4]/TX100/cyclohexane microemulsions using steady state and time resolved fluorescence spectroscopy as a tool and coumarin 480 (C-480) as a fluorescence probe. The size of the microemulsions increases with addition of PEG-4...

Journal: :Journal of colloid and interface science 2004
M Ben Moshe S Magdassi Y Cohen L Avram

The structure of microemulsions prepared by the anionic gemini surfactant didodecyl diphenyl ether disulfonate (C12-DADS) was investigated by a solvatochromic probe and nuclear magnetic resonance (NMR) diffusion measurements. The NMR measurements indicate the presence of bicontinuous and oil-in-water microemulsions depending on microemulsion composition. The absorbance spectra of the solvatochr...

2016
Shin-ichi Yusa Kenichi Fukuda Kazuhiko Ishihara Yotaro Morishima Y. Miyazaki K. Yoshida A. Marangoni

Combinations of lecithin with hydrophilic (e.g. C8-PEG) and lipophilic (e.g. sorbitan monooleate) linkers (unbalanced amphiphiles) have been used to produce microemulsions with a wide range of oils. The resulting microemulsions have been found to be biocompatible through a number of tests, including cell viability tests, Human Repeat Insult Patch Test (HRIPT), and Ames test. In this presentatio...

Journal: :Journal of applied microbiology 2000
I S Al-Adham E Khalil N D Al-Hmoud M Kierans P J Collier

Microemulsions are physically stable oil/water systems that have potential use as delivery systems for many pharmaceuticals which are normally of limited use due to their hydrophobicity, toxicity or inability to access the site of action. It has been suggested that microemulsions are self-preserving antimicrobials in their own right, although there is little evidence to support this. In this ex...

2008
Richie Ryan Sheila Donegan

502 What is MELC? Microemulsions are stable, isotropically clear solutions consisting of an oil (such as octane) and water stabilized by a surfactant and co-surfactant. To form such a mixture the interfacial tension between the oil and water has to be decreased by the addition of both a surfactant and a cosurfactant. Sodium dodecyl sulphate (SDS) is a common and widely used surfactant.1,2 Mediu...

Anayatollah Salimi Behzad Sharif Makhmal Zadeh Eskandar Moghimipour,

  Objective(s): The objective of this study was to design a topical microemulsion of Vit B12 and to study the correlation between internal structure and physicochemical properties of the microemulsions. Microemulsions are thermodynamically stable mixtures of water, oil, surfactants and usually cosurfactants with several advantages for topical and transdermal drug delivery. The formul...

Kalantari, Heibatullah, khoshnood, saeed, Mahdavinia, Masoud, Raesi Vanani, Atefeh, Shirani, Maryam,

Introduction: Candida infections constitute a large group of diseases, so today the need for low-harm antifungal agents is felt more than ever. Securigera Securidaca L. is a medicinal plant with antimicrobial, anti-pest, anti-parasitic and anti-fungal properties. Therefore, the aim of this study was to determine the anti-candida effects of microemulsion of ethanolic and methanolic extracts of S...

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