INTRODUCTION Available literature suggests that the advantage of animal-derived surfactants over first-generation synthetic agents derives from the presence of surface-active proteins and their phospholipid content. Here we summarize the results of clinical trials comparing animal-derived surfactant preparations with other animal-derived surfactants and with both first-and second-generation syn...

We study self-assembly of surfactants in two dimensions using off-lattice Monte Carlo moves. Here the Monte Carlo moves consist of slithering snake reptation motion of the surfactant chains and kink-jump of the individual monomers. Unlike many previous studies an important feature of our model is that the solution degrees of freedom are kept implicit in the model by appropriate choice of the ph...

The selection of media in dissolution method development can sometimes be an arbitrary decision. The case studies in this article give a practical rationale that should help in selecting media, especially surfactants. Three cases were studied: (1) the role of surfactants versus compound stability in the dissolution medium during dissolution method development, (2) the selection of a surfactant ...

Surfactants are one of the major components (10- 18%) of detergents and household cleaning products and are used in high volumes in developed countries. In the present research work, the ability of rice husk as a low cost adsorbent for anionic and nonionic surfactants in wastewater has been studied. The maximum removal efficiency for anionic surfactants was 97%, in an aqueous solu...

Detergent surfactants can be found in wastewater in relevant concentrations. Most of them are known as ready degradable under aerobic conditions, as required by European legislation. Far fewer surfactants have been tested so far for biodegradability under anaerobic conditions. The natural environment is predominantly aerobic, but there are some environmental compartments such as river sediments...

This work describes a one-step method for the chemical modification of polydimethylsiloxane (PDMS) surfaces. Thin films of ionic and non-ionic surfactants were patterned into an array format, transferred onto silicone pre-polymers, and subsequently immobilized onto the PDMS surfaces during vulcanization. Our results show that while all surfactants tested can render PDMS surfaces hydrophilic thr...

We studied the effects of four soluble surfactants on DPPC monolayers to elucidate the action of these membrane perturbants. The presence of nonionic N-9 and amphoteric C31G strongly affected the pure DPPC isotherm, while anionic SDS and cationic DTAB had little effect. The impact of surfactant on DPPC domain shape in the liquid condensed-liquid expanded coexistence region showed the opposite r...

A filter paper bioassay was developed for testing the efficacy of nematodes and other agents for control of Diaprepes abbreviatus larvae. Surfactants, with and without Steinernema riobravis, were screened first in the filter paper bioassay and then in a potted citrus seedling study. The results of the two assays were in agreement on the relative merits of the compounds tested. Surfactants incre...

This study systematically investigated how anionic surfactants of various hydrophilicities affected the activities of three metabolically important enzymes –– glutamate dehydrogenase (GDH), lactate dehydrogenase (LDH), and malate dehydrogenase (MDH) –– of different molecular masses at a pH range important to body functions (6.5-7.4). We also investigated the time course of the surfactant concen...