This study presents mass transfer modeling of solvent extraction by membrane contactors. The extraction system was a membrane contactor, an aqueous solution of ethanol and acetone as the feed and a near-critical phase of carbon dioxide as the solvent. Model was based on solving conservation equations for solutes in the membrane contactor. The equations of the model were solved by numerical meth...

Abstract One of the challenges in biofuel production from lignocellulosic wastes is to improve its conversion solvents; therefore, new strategies enhance xylose uptake are required due be secondary abundant sugar. In this context, a novel fermentation strategy integrating co-culture Clostridium acetobutylicum and Saccharomyces cerevisiae with pH control was developed. Initially, two different b...

the enzyme pgalactosidase from a mutant strain of a. niger uv-5 was partially purified using ammonium sulfate and acetone. the saturation range of 60-80% ammonium sulfate was found to yield 60.5% enzyme recovery with 2.4 fold purification. acetone precipitation at enzyme: acetone ratio of 1 : 1.5 brought about a higher yield i.e. 68% and three-fold purification. the combined procedures of 1.5 v...

Black tea was extracted for 2, 8 and 18 h with absolute acetone, N,N-dimethyl-formamide (DMF), ethanol and methanol and their 50% aqueous solutions. The extracts were screened for total polyphenol contents, antioxidant and antibacterial activities. The polyphenol content of the extracts was found to be in the range of 0.44-114.01 mg gallic acid equivalents (GAE)/g dry weight tea, depending on t...

During terminal differentiation, mammalian epidermal lipids undergo striking changes in both composition and distribution. Phospholipids and neutral lipids are replaced by a mixture of ceramides and neutral lipids organized in intercellular lamellar bilayers. Whether all of these lipids and/or whether specific lipid classes regulate permeability barrier function is not known. When hairless mice...

background: woodfordia fruticosa is used traditionally as antidysenteric compound for fodder animals. stem and flower extracts are previously flourished for their antibacterial activity. leaves are also equally important, which are preliminary screened for their bioactive components in present study. objective: evaluation of antibacterial activity of leaves of w. fruticosa and detection of thei...

In this paper we introduce a mean field method for simulating complex molecular systems like liquids and solutions. Using well-established theoretical principles and models, we obtained a relatively simple approach which seems to provide a reliable description of the bulk molecular behavior of liquid water. Moreover, we have applied this approach to study simple solutes in solution, like sodium...