Absorption maxima factors affecting

Albeck, A., Livnah, N., Gottlieb, H., and Sheves, M., T-NMR studies of model compounds for bacteriorhodopsin. Factors affecting the retinal chromophore chemical shifts and absorption maximum, J. Am. Chem. Soc., 114, 2400, 1992. 

ABSTRACT Ephedra waste was modified by epichlorohydrin and diethylenetriamine to obtain aminated ephedra waste biosorbent. The factors affecting the adsorption efficiency, such as pH and contact time were investigated. The results showed that the optimum absorption conditions of aminated ephedra waste pH was 4.7 contact time was 3 h equilibrium was well described by Langmuir isotherms and kinetics was found to fit pseudo-second order type. According to the Langmuir equation, the maximum adsorption capacities of modified adsorbent for Cu + are 93.11 mg/g, which are higher than untreated adsorbent (17.61 mg/g). The aminated ephedra waste biosorbent had excellent absorbability toward heavy metal ions Cu f... 

Several factors originating from the chemical structure and property of the drug molecule, and from the physiology within the environment in the GI tract, affect the flow of molecules across the intestinal membrane. These factors include solubility, partition coefficient, pffa, molecular weight, molecular volume, aggregate, particle size, pH in the lumen and at the surface of the membrane, GI secretions, absorptive surface area, blood flow, membrane permeability and enzymes (for more factors, see Ungell 1997, and Table 4.8). Complete absorption occurs when the drug has a maximum permeability coefficient and maximum solubility at the site of absorption (Pade and Stavchansky 1998). 

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