PubMed Health⌕ Search

Biomedical subjects

H A el-Sourady

Publications and source records attributed to H A el-Sourady.

4 recordsLinked to original sources
PubMed1985

Stability of chlortetracycline hydrochloride and chloramphenicol in some ophthalmic ointment bases.

The stability of chlortetracycline hydrochloride at 25 and 35 degrees C in absorption base with and without antioxidant decreased during storage for 12 months, while, in water-in-oil emulsion base the medicament was more stable than in oil-in-water emulsion ointment bases. Chloramphenicol was more stable in the absorption base that contained lanolin than in the base which contained cetyl alcohol. Chloramphenicol was more stable in oil-in-water than in water-in-oil emulsion bases. The decomposition rate constant of chlortetracycline hydrochloride and chloramphenicol followed first order kinetics, when the stability study was carried out at 25 and 35 degrees C.

Chloramphenicol↗
PubMed1985

Availability studies on acetylsalicylic acid, salicylamide and phenacetin at different pH values.

The optimum partitioning rate of acetylsalicylic acid has been attained at pH = 4 and minimum partitioning rate was found to be at pH = 8. The maximum partitioning rate of salicylamide was observed at pH = 5 and the smallest one was found at pH = 6 or 8. At pH = 3 a maximum amount of phenacetin was found in the aqueous phase, while at pH = 6 a maximum amount was found in the octanolic layer. The maximum partitioning rate was found at pH = 6 and lowest one was observed at pH = 3. The gastrointestinal absorption of acetylsalicylic acid, salicylamide and phenacetin was significantly increased, as reflected by the urinary excretion data in presence of solid buffer components at pH values of 4,5 and 6 respectively.

Adult↗
PubMed1985

Effect of certain additives on the diffusion characteristics through a cellophane membrane of acetylsalicylic acid, salicylamide and phenacetin. Part 1: Effect of certain surface active agents.

The diffusion rate (D. R.) of certain ionic and non-ionic surfactant concentrations through a standard cellophane membrane was studied. D. R. of acetylsalicylic acid significantly increased in the presence of 0.1% w/v Brij 35, Tween 20 or 40 respectively. The other tested surfactants slightly increased D. R. of acetylsalicylic acid, while that of salicylamide increased in presence of 0.1% w/v of either Tween 20, 40, 60 or 80; Myrj 52 or 59; Brij 58; benzalkonium chloride, cetrimide or sodium lauryl sulphate. The highest D. R. of phenacetin was observed in presence of either 0.01% w/v Tween 20 or 0.001% w/v Brij 35.

Analgesics↗