Mol Surf

Norinder U, OsterbergT, Artursson P (1999) Theoretical calculation and prediction of intestinal absorption of drugs in humans using Mol Surf parameterization and PLS statistics. Eur J Pharm Sci 8, 49-56. 

Norinder, U. Sjoberg, P Osterberg, T. Theoretical Calculation and Predition of Brain-Blood Partitioning of Organic Solutes Using Mol Surf Parametrization and PLS Statistics, . 7. Pharm. Sci. 87, 952-959 (1998). 

Neuhoff, S., H. Spahn-Langguth, C.-G. Regirdh, T. B. Andersson, U. Norinder, and P. Langguth. 1999. Computational approach to predict affinity of drugs to MDR1 encoded P-glycoprotein using Mol-Surf parametrization. Arch. Pharm. Med. Chem. 331 (suppl. 2) 33. 

Mol thiophene converted)(mol surf. Mo) s x 10. Aqueous solution of (NH4)6M07O26-4H2O. 

Bastogne F, David C (1998) Colloids Surf A Physicochem Asp 139 311-320 Baeyens-Volant D, Cuvelier P, Fomasier R, Szalai E, David C (1985) Mol Cryst Liq Cryst 128 277-286... 

CEC = ffsurfex surf is the cation exchange capacity of the clay (mol kg"1)... 

Tully, J. C. 1981, in Potential Energy Surf. Dyn. Calc. Chem. React. Mol. Energy Transfer, Truhlar, D. G., ed., New York Plenum, pp. 805-816. 

Three different ways have been developed to produce nanoparticle of PE-surfs. The most simple one is the mixing of polyelectrolytes and surfactants in non-stoichiometric quantities. An example for this is the complexation of poly(ethylene imine) with dodecanoic acid (PEI-C12). It forms a solid-state complex that is water-insoluble when the number of complexable amino functions is equal to the number of carboxylic acid groups [128]. Its structure is smectic A-like. The same complex forms nanoparticles when the polymer is used in an excess of 50% [129]. The particles exhibit hydrodynamic diameters in the range of 80-150 nm, which depend on the preparation conditions, i.e., the particle formation is kinetically controlled. Each particle consists of a relatively compact core surrounded by a diffuse corona. PEI-C12 forms the core, while non-complexed PEI acts as a cationic-active dispersing agent. It was found that the nanoparticles show high zeta potentials (approximate to +40 mV) and are stable in NaCl solutions at concentrations of up to 0.3 mol l-1. The stabilization of the nanoparticles results from a combination of ionic and steric contributions. A variation of the pH value was used to activate the dissolution of the particles. 

The third way to PE-surf nanoparticles is based on the use of polyampholytes, i.e. polyelectrolytes that contain cationic and anionic groups. Examples are long-term stable fluorinated nanoparticles, prepared by the complexation of polyampholytes with perfluorododecanoic acid [131]. The polyampholytes are statistic copolymers of styrylmethyl(trimethyl)ammoni-um chloride, methacrylic acid, and methyl methacrylate having more cationic monomers (28-100 mol %) than anionic monomers (0-16%). The cationic monomers form a complex with perfluorododecanoate ions to create neutral... 

Normally mass transfer between two phases is modelled using a mass transfer coefficient (km). The flux (mol s-1 m. surf) of a component i is given by the formula... 

Bouwman R, Freriks ILC (1980) Appl Surf Science 4 11, 21 Bozio R, Girlando A, Pecile C (1975) J Phys Chem 33 1237 Bracketnann H, Buback M, Vogclc HP (1986) Makromol Chem 187 1977 Bradbury EH, Price WC, Wilkinson GR (1961) J Mol Biol 3 301... 

G. 1. Golodets, Stud. Surf. Sci. Catal, 15 (Heterog. Catal. Reactions Involving Mol. Oxygen), Elsevier, Amsterdam, (1983). 

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