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Poly(lactide-co-glycolide) (PLGA) nanoparticles coated with poloxamer 188 (Pluronic((R)) F-68) or polysorbate 80 (Tween((R)) 80) enable an efficient brain delivery of the drugs after intravenous injection. This ability was evidenced by two different pharmacological test systems employing as model drugs the anti-tumour antibiotic doxorubicin and the agonist(More)
The interaction of highly purified duck egg white ovomucoid with trypsin and chymotrypsin was studied. It was found that the ovomucoid molecule contains two equally effective trypsin-binding sites which, in their turn, comprise lysine residues and one independent chymotrypsin-binding site. The values of inhibition constants were determined and the changes(More)
Oral administration of diluted solutions of insulin results in the absorption of the hormone into bloodstream. After oral administration of diluted insulin solutions to healthy volunteers and animals with experimental diabetes insulin does not undergo hydrolytic degradation under the action of proteolytic enzymes and its absorption is sufficient to produce(More)
Parenteral formulations of the poorly soluble antituberculosis antibiotic rifapentine were developed. Proteins (human serum albumin, succinylated gelatin, and sodium caseinate) were used to produce water-soluble forms of rifapentine by precipitation or homogenization. Ultrasonic homogenization gave the best results, i.e., stable colloidal suspensions with 9(More)
A method has been developed for producing a biospecific hydrogel hemosorbent by the radical copolymerization of an unsaturated derivative of ovomucoid from duck egg white with acrylamide and N, N’-methylene bisacrylamide in an aqueous solution in the presence of mercaptoacetic acid serving as a chain transfer agent. The use of a chain transfer agent has(More)
The dependence of the activity of trypsin immobilized in polyacrylamide hydrogel on the hydrogel swelling ratio, the size distribution of its pores, and the means of enzyme binding has been studied. It has been shown that the most favorable conditions for immobilized trypsin are provided upon its binding to hydrogel via trypsin macromonomer copolymerization(More)
The interaction of ovomucoid proteinase inhibitor prepared from duck egg white with a dextran of a molecular weight of 70,000 preliminary treated with potassium periodate. Irrespective of the number of the sites of the ovomucoid binding to aldehyde-dextran the anti-chymotryptic activity is equal to that of the native inhibitor, while the antitryptic(More)
Experiments on animals showed that native proteins may diffuse into the blood flow after oral administration of diluted protein solutions. An in vitro study led us to hypothesize that treatment with diluted solutions is accompanied by a decrease in the rate of protein proteolysis and accelerated protein diffusion through the intestinal mucosa.
The influence of insulin preparations (Actrapid and Ransulin) on the glucose and insulin blood level has been studied in patients with diabetes mellitus. It has been shown that comparable changes in the measured parameters are achieved in most patients with oral doses of Ransulin that are two to three times higher than the doses of Actrapid.
The thromboresistance of glucose-sensitive polymer hydrogels, modeling one of the functions of the pancreas, namely, the ability to secrete insulin in response to the introduction of glucose into the environment, has been studied. Hydrogels were synthesized by the copolymerization of hydroxyethyl methacrylate with N-acryloyl glucosamine in the presence of a(More)