title: Effect of some ethoxylated sorbitan alkanoate on hydrocortisone release from methylcellulose gels.
abstract: The process of hydrocortisone release from the nonionic polymer--methylcellulose hydrogels with the addition of 1% and 3% ethoxylated sorbitan alkanoate: polysorbate 20 or polysorbate 80, in the presence of 1,2-propylene glycol or PEG 200 has two stages. In the first stage the release rates are higher in comparison with the second stage. Concerning the hydrogel as a two-compartment system with micellas of polysorbates, the release rates of the first stage are in the range 4.27 x 10(-4)-6.23 x 10(-4) h-1 and in the second stage are in the range 8.29 x 10(-6)-1.16 x 10(-5) h-1 what can be affected by HLB of mentioned polysorbates.
authors.affiliation: Department of Pharmaceutical Technology, Wrocław Medical University.
authors.forename: Aleksander A
authors.initials: AA
authors.lastname: Kubis
authors.forename: Witold
authors.initials: W
authors.lastname: Musiał
authors.forename: Maria
authors.initials: M
authors.lastname: Szcześniak
mesh_terms: D006854:Hydrocortisone / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D008747:Methylcellulose / Q000737:chemistry; D011136:Polysorbates / Q000737:chemistry*; D019946:Propylene Glycol / Q000737:chemistry
chemical_list: D020100:Hydrogels; D011136:Polysorbates; D019946:Propylene Glycol; D008747:Methylcellulose; D006854:Hydrocortisone