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Biomedical subjects

K Pintye-Hódi

Publications and source records attributed to K Pintye-Hódi.

At least 19 recordsLinked to original sources
PubMed1990

Production and investigating of tablets containing furosemide and beta-cyclodextrin.

Furosemide is a very active drug with an excellent saluretic effect, but it dissolves in water only with difficulty. Furosemide products with beta-cyclodextrin (CD) have been made by five methods, and it has been established that most drugs are liberated most quickly from the kneaded product for the 12.72% combinations. The dissolution characteristics of furosemide are improved in tablets made from the kneaded product. By this means an essentially quicker effect can be achieved, a lower drug quantity is necessary for a similar effect, a smaller therapeutic risk in involved, and the technique is economical too.

Cyclodextrins↗
PubMed1988

[The liberation of phenylbutazone from tablets].

The liberation of phenylbutazone from tablets prepared by wet granulation was examined. It was found that the solution process can be described by the equation c = cs (l-e-K.t alpha). The influence of the binder concentration and the disintegrant on the liberation rate was also studied. The increase of the Klucel MF concentration accelerated the liberation of the agents. Among the disintegrants Polyplasdone XL and cyclodextrin block polymer turned out to be very good.

Drug Compounding↗
PubMed1988

[Direct compression nitrazepam tablets].

Tablets of nitrazepam were made by direct compression. The influence of different dry binders and other adjuvants on the physical parameters of the tablets and their texture (scanning electron microscope: SEM) were examined. Changes in the physical parameter can be explanded if the texture is known.

Drug Compounding↗
PubMed1987

[The polymorphism of drugs in powders and tablets. 1. The preparation and characterization of polymorphic modifications of phenobarbital].

The characterisation of three phenobarbital modifications by thermic examination procedures (DSC, DTA) is being described. Modification I was obtained by thermic treatment of the brands (modification II) from Hungary and the GDR. The spray product prepared, consisting of very fine hollow spheres, was identified as modification III. Besides the particle size distribution the form of the particle was determined by scanning electron microscopy (REM). The best results regarding saturation solubility and speed of dissolution were found for the spray product.

Chemistry, Pharmaceutical↗
PubMed1987

[The polymorphism of drugs in powders and tablets. 4. The effect of the polymorphism of drugs on the physical properties and drug release of phenobarbital tablets].

Four products of phenobarbital (I, II1, II2, III) are manufactured into tablets with the dry binders Avicel PH 101 or Heweten 40 using different pressures by direct tabletting. The physical properties of the resulting tablets are different according to the modification of phenobarbital, the binders used and the pressure during tabletting. The dissolution behaviour of the drug may be changed by the different technological and physical parameters.

Chemical Phenomena↗
PubMed1987

Release kinetics of potassium aspartate in polyvinyl chloride matrix formulation.

The authors prepared potassium aspartate matrix tablets in combination with polyvinyl chloride. The physical parameters were measured and the dissolution rates were determined. During the in vitro release rate experiments, it was determined that the dissolution kinetics obey both zero order and Higuchi diffusion model order kinetics.

Aspartic Acid↗
PubMed1985

[The use of dry binding materials for the direct compression of phenylbutazone].

Direct compression of phenylbutazone is possible only with addition of excipients of several kinds, because its material properties are unfavourable. It is necessary to use besides disintegrant glidant, lubricant and antistatic agents too. The authors investigated the influence of two microcrystalline cellulose binders (Avicel and Heweten) for the pressability of phenylbutazone and on properties of the tablets, respectively. It was determined the physical parameters of the tablets and the dissolution characteristics of the active ingredient. It has been found, that Heweten optimized the exactness of dosage of the tablets as well as resulted in a faster dissolution than Avicel. Therefore, Heweten proved to be the more suitable binder.

Drug Compounding↗
PubMed1983

[The texture and properties of sulfaethidol tablets].

Scanning-electron-microscopic and X-ray diffractometric studies on the effect of the pressing power on the physical parameters of compressed tablets and on the texture of tablets containing sulfaethidol as the active principle, have shown that the crystal structure remains unchanged. The alterations observed in the physical parameters can be explained on the basis of present knowledge of the texture.

Chemical Phenomena↗
PubMed1982

[On the compression behaviour of spray-dried sulphathiazole (author's transl)].

The authors prepared a spray-dried sulphathiazole product consisting of hollow pellets, the drug being in the form of its metastable modification I (melting point, 200 degrees C). On the basis of force-time diagrams and of current parameters relative to the elasto-plastic deformability of substances intended for tabletting, the compression behaviour of the spraydried product was compared with that of sulphathiazole (modification I) tempered at 180 degrees C for 150 min. Scanning-electron-microscopic studies on tablet surfaces offered further insight into the compressibility of the spraydried product.

Chemical Phenomena↗
PubMed1982

[On the polymorphism of barbiturates in powders and tablets. 6: Properties and behaviour of a spray-dried barbital preparation].

The manufacture of a spray-dried barbital preparation is described, the properties, tabletting behaviour and release of which were studied in comparison to the initial substance. Spray-drying led to a compression-resistant mixture of amorphous and crystalline particles. As most of these particles have a spherical shape, the tablets obtained from this mixture were of great compactness, which inhibited the penetration of the medium and, consequently, delayed the release of the drug, too.

Barbital↗
PubMed1980

[On the Polymorphism of barbiturates in powders and tablets. Part 4: the dissolution of barbital B and barbital A (modifications I and III and their release from tablets (author's transl)].

Two commercial brands of barbital (A: German Democratic Republic, modification III; B: Hungarian Peopl's Republic, modification I) were used to study the solubility and dissolution of the modifications. Crystals of these two substances were brought into the shape of tablets, the physical parameters and textural properties of which were determined. The effect of polymorphism on the release of these substances is discussed in the light of the results obtained from this investigation. The discussion will be continued and summarized in a subsequent paper, including further modifications.

Barbital↗
PubMed1980

[On the polymorphism of Barbiturates in powers and tablets. Part 5: The dissolution of recrystallized barbital substances and their release from tablet (author's transl)].

The dissolving characteristics of 6 different barbital modifications have been studied. With one exception, the metastable forms dissolved more rapidly than the stable form. The observed differences were not always significant. Substances recrystallized from an acetone-water mixture were less soluble in aqueous solvents than those recrystallized from water. The dissolving characteristics are changed by tabletting, the stable modification being more favourable in this respect. The solubility of barbital A2 was very poor. Consequently, it is not suited for therapeutic use. The dissolution rate was determined by means of the rotating basket method as described in the nineteenth edition of the U.S.P.

Barbital↗
PubMed1979

[Study of the texture of furosemid tablets. Part 2 (author's transl)].

The authors studied the alterations of the texture and of the physical properties of Furosemid tablets, which are prepared with the aid of hydroxypropylcellulose mucilage, that occur during storage. Klucel MF mucilage proved to be a very good binding agent. Though the film bursted on drying during storage, by which the pore volume of the tablets increased, the mechanical strength remained almost unchanged. The cause of this is the formation of solid bridges.

Cellulose↗