Gordon Flynn

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Polyethylene glycols (PEGs) 600,1000, and 2000 were used to study the molecular weight permeability dependence in the rat nasal and gastrointestinal mucosa. Absorption of the PEGs was measured by following their urinary excretion over a 6-hr collection period. HPLC methods were used to separate and quantitate the individual oligomeric species present in the(More)
The effectiveness of three adhesive tapes, 3M’s No. 810, No. 845 and No. 850, in stripping stratum comeum from hairless mouse skin. was compared by measuring transdermal water loss (TEWL) and distribution profiles of a marker, minoxidil, from a solution formulation. While No. 850 tape failed to increase TEWL perceptively even after 24 strippings, both No.(More)
The permeation of fentanyl and sufentanil through cadaver skin membranes was investigated using in vitro diffusion cell techniques. Neither drug influenced the permeation of the other when they were concurrently applied to the skin membrane. With respect to transdermal delivery, short diffusion lag times of less than 0.5 hr were observed for each compound.(More)
BACKGROUND Cardiac output (CO) and systemic vascular resistance (SVR) are two important parameters of the cardiovascular system. The ability to measure these parameters continuously and noninvasively may assist in diagnosing and monitoring patients with suspected cardiovascular diseases, or other critical illnesses. In this study, a method is proposed to(More)
The pH dependence of the aqueous solubility of morphine, fentanyl, and sufentanil was investigated at 35°C. Dissociation constants and corresponding pK a′ values of the drugs were obtained from measured free-base solubilities (determined at high pH's) and the concentrations of saturated solutions at intermediate pH's. Morphine, fentanyl, and sufentanil(More)
The physicochemical properties of select opioid and anilinopiperidine narcotic analgesics were investigated. The solubilities of the narcotics in hexane and water and, for morphine, in other organic solvents were determined. Regular solution theory seems to be applicable to the solubility behavior of morphine in solvents that lack strong dipoles and(More)