By Jens T. Carstensen
Offering present information on crystallization, dissolution from debris and polydisperse populations, powder volumes and densities, comminution, rainy granulation, and hard-shell drugs, complicated Pharmaceutical Solids, describes moisture isotherms with crystalline solids, records the consequences of moisture on solid-state balance, highlights pill physics and rules, explains sustained liberate via microencapsulation, provides prediction equations for solubility in binary solvents, discusses particle sizes and diameters, identifies Brunauer, Emmett, and Teller Isotherms and extra! contemplating homes of solids, permeamitry and fuel absorption equipment, amorphates, and purification via pH-change precipitation, complicated Pharmaceutical Solids is an important reference for pharmacists pharmaceutical scientists medicinal, actual, floor, colloid, and analytical chemists and biochemists and an efficient textual content for upper-level undergraduate and graduate scholars in those disciplines.
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Extra info for Advanced Pharmaceutical Solids (Drugs and the Pharmaceutical Sciences)
Brsnsted JN (1933b). Fysisk Kemi. Munksgaard, Copenhagen, p 140. Fysisk Kemi. ~ u n k s g a a r d ,openh hag en, p 141. tamante C, Qchoa R, Reillo A, Escalera JB (1994). Chem tamante C, Qchoa R, Rei110 A, Escalera JB (1994). Chem arstensen JT (1977). FormulationandPreparation of Dos Elsevier/North-Holland ~iomedical,Amsterdam, pp 197-21 5 , Chen A, Zito S, Nash R (1994). Pharm Res 11:398. Diaz D, Bernard MJB, Mora JG, Lianos CME (1998). Pharm Dev Techno1 3:395. Denbigh IC (1961). "he PrinciplesofChemical Equilibrium.
To assign the change in heat capacity as an explanation to the nonlinearity is rational only in the sense that the composition changes with temperature; hence, the change in heat capacity also changes. There are many examples of this; for instance, Longuemard et al. (1998) have reported on the solubility of aspirin in 38% alcohol; they failed to obtain linearity according to the 'Van't Hoff, although in this case the curvature may be because the ordinate is in grams per liter (g/L), rather than in grams per 1000 g (g/lOOO g) of solvent * The solvent has a great i ~ ~ u e n on c e solubility and should always be speci~ed.
39) is mass not dissolved at time t, A is the surface area, S is the solubility, and k is the intrinsic dissolution rate constant. 40) where first-order kinetics are assumed, and where k l is the decomposition rate constant. 44) - Co] The value of may be found by iteration, and this then gives both the value of S and kl (provided the surface area is known). urfactants, such as the polysorbates, willsolubilize drug compounds when the surfactant is present in excess of its critical micelle concentration ( solubility will increase linearly with surfactant concentration.
Advanced Pharmaceutical Solids (Drugs and the Pharmaceutical Sciences) by Jens T. Carstensen
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