'Organic phase' diaporamas de présentation

Extraction

Extraction. A useful technique for purification of mixture. Separation processes. Liquid-liquid extraction Adsorption Filtration Solid-liquid extraction (leaching) Elution chromatography Membrane separation processes Distillation Affinity separation processes Drying and evaporation

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Membrane extraction and adsorption from aqueous media

Membrane Extractions and Adsorptions in Separation of Biomolecules from Multicomponent Mixtures Md M Hossain* Department of Chemical & Petroleum Engineering, United Arab University, P.O. Box 15551, Al Ain, UAE. *. Membrane extraction and adsorption from aqueous media.

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Measuring Gene Expression

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Chemistry and Physics of Hybrid Materials

Chemistry and Physics of Hybrid Materials. Lecture 2. Today. Quiz #1 Biohybrids Tools for making hybrids. Hybrid Organic-Inorganic materials are common in nature: composites. Animals. Organic phase is biopolymers. Nacre. Plants. phytolith. Argonite (CaCO 3 ) plates as inorganic

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Physics and Chemistry of Hybrid Organic-Inorganic Materials Lecture 5: Naturally occurring hybrids

Physics and Chemistry of Hybrid Organic-Inorganic Materials Lecture 5: Naturally occurring hybrids. Biological hybrids: key points. Hybrids made by plants or animals Strong composites from very weak components Wet protein and carbohydrates are very soft calcium carbonate is also weak and soft

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2D-QSAR Studies on 1, 4-dihydropyridines as Ca Channel Blockers

Calcium channel blockers are widely used for the treatment of various cardiac disorders. The existing calcium channel blockers have several short comings; hence there is a need to develop better drugs with better therapeutic profile. 2D-QSAR approach has been useful in such cases. A number of 1, 4- ihydropyridines like amlodipine are extensively used in therapy of cardio vascular disorders. Looking into importance of calcium channel blockers, a series of 1, 4- dihydropyridines was selected and different models based on Multiple linear regression (MLR), Principal component regression (PCR) and Partial Least Squares regression (PLR) analysis were generated to find out correlation between the physicochemical parameters and the biological activity. Multiple linear regression (MLR) coupled with stepwise variable selection led to a statistically significant model as compared to PLR and PCR with respect to r2 (coefficient of determination 0.8986) and q2 (cross- validation, > 0.5). Four descriptors are included in 2D- QSAR equation generated by using MLR.

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Selective Extraction of 7-aminodeacetoxycephalosporanic acid and Cephalexin antibiotics with Aliquat-336

The reactive extraction of 7-ADCA aminodeacetoxycephalosporanic acid) and Cephalexin with Aliquat-336 (tricaprylmethyl ammonium chloride) dissolved in n-butyl acetate as solvent has been studied over a pH range of 5 to 8. The effect of such parameters as Aliquat-336 concentration, pH and 7-ADCA and Cephalexin concentrations on distribution coefficient in the reactive extraction system has been evaluated. It was found that distribution coefficient (Kd) increases with increases of the aqueous phase pH implying that the anionic forms of the dissociated 7-ADCA and cephalexin are amendable for reactive extraction. Furthermore inference of practical relevance that could be drawn from the present study is that 7-ADCA and cephalexin can be selectively extracted from an aqueous solution typical of that encountered in biosynthesis of 7-ADCA and cephelexin. Study on reextraction of 7-ADCA and cephalexin from the extracted phase was carried out using an aqueous solution of acetate was found to be pH dependent which also attribute to ionization behaviour of the beta-lactams. Such observation is considered important as re-extraction at an appropriate pH value is possible

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Phase Transfer Catalysts Are Reshaping Today’s Polyester Industry, Understand How!

Phase Transfer Catalysis is extensively utilized as a portion of the commercial manufacturing of chemicals of more than 10 billion dollars per year. PTC is furthermore appropriated as a part of the prevention of pollution, its treatment and for the contaminants elimination in waste and product streams. The use of PTC with inorganic base i.e. NaOH can easily replace the use of risky as well as expensive bases like sodium methylate, sodium amide or sodium hydride etc. Read This PDF to know more about Phase Transfer Catalysts.

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Organotin Compounds

Organotin Compounds. Robert Ono 4 December 2012. Organotin Uses. Protodehalogenation. Cross-Coupling ( Stille ). Trialkyltin Chlorides. Size of R. Reactivity. decrease. increase. Toxicity. Example:. SnMe 3 Cl vs. SnBu 3 Cl. LD 50 12.6 mg/kg 129 mg/kg.

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