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Stereoselective drug release from Ketoprofen and Ricobendazole matrix tablets
Author(s) -
Álvarez Covadonga,
Torrado Juan J.,
Cadórniga Rafael
Publication year - 1999
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/(sici)1520-636x(1999)11:8<611::aid-chir1>3.0.co;2-z
Subject(s) - chemistry , ketoprofen , stereoselectivity , drug , pharmacology , matrix (chemical analysis) , combinatorial chemistry , stereochemistry , chromatography , organic chemistry , catalysis , medicine
Abstract Crystalline characteristics of racemic, pure R and S enantiomers and physical mixtures of Ketoprofen (KET) have been studied by DSC and X‐ray diffractometry. Aqueous solubilities were 182.6 ± 9.1 μg/ml for racemic KET, 259.6 ± 6.6 μg/ml for R‐KET, and 304.3 ± 2.7 μg/ml for S‐KET. Matrix tablets made with racemic and physical mixtures of KET show stereoselective drug release, which is faster for S‐KET than for R‐KET. This effect is more marked when the chiral excipient hydroxypropylmethylcellulose (HPMC) is used in place of the achiral Eudragit RL. Stereoselectivity of release is also affected by the amount of KET. Similar results were obtained when another chiral drug with low solubility, Ricobendazole (RBZ), is used. Depending on the excipient and drug dosage, more or less marked stereoselective drug release is obtained in RBZ matrix tablet formulations. Chirality 11:611–615, 1999. © 1999 Wiley‐Liss, Inc.