Solubilities of tricyclic acyclovir derivatives in buffered aqueous solutions of hydroxypropyl-beta-cyclodextrin (HP-beta-CD) at pH 5.5 and 7.0 were determined at 25 and 37 A degrees C. Complexation of these compounds with HP-beta-CD resulted in a noticeable increase of their solubility; nevertheless it was limited to tricyclic derivatives of acyclovir carrying an aryl substituent. Combination of H-1 NMR and DSC techniques demonstrated the existence of inclusion complexes between acyclovir derivatives and HP-beta-CD. The stability constants, estimated using the Higuchi-Connors method, were found in the range of 10-100 M-1. Additionally, the pK (a) values at 25 A degrees C and molar extinction coefficients in aqueous buffered solutions were also determined for all studied compounds.
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King Faisal Univ, Coll Clin Pharm, Dept Pharmaceut Sci, Al Hasa 31982, Saudi ArabiaKing Faisal Univ, Coll Clin Pharm, Dept Pharmaceut Sci, Al Hasa 31982, Saudi Arabia
Nair, Anroop B.
Attimarad, Mahesh
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King Faisal Univ, Coll Clin Pharm, Dept Pharmaceut Sci, Al Hasa 31982, Saudi ArabiaKing Faisal Univ, Coll Clin Pharm, Dept Pharmaceut Sci, Al Hasa 31982, Saudi Arabia
Attimarad, Mahesh
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Al-Dhubiab, Bandar E.
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Wadhwa, Jyoti
Harsha, Sree
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King Faisal Univ, Coll Clin Pharm, Dept Pharmaceut Sci, Al Hasa 31982, Saudi ArabiaKing Faisal Univ, Coll Clin Pharm, Dept Pharmaceut Sci, Al Hasa 31982, Saudi Arabia
Harsha, Sree
Ahmed, Mueen
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King Faisal Univ, Coll Clin Pharm, Dept Pharmaceut Sci, Al Hasa 31982, Saudi ArabiaKing Faisal Univ, Coll Clin Pharm, Dept Pharmaceut Sci, Al Hasa 31982, Saudi Arabia
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Chiang Mai Univ, Fac Pharm, Chiang Mai 50200, Thailand
Chiang Mai Univ, STRI, NPRDC, Chiang Mai 50200, ThailandChiang Mai Univ, Fac Pharm, Chiang Mai 50200, Thailand
Manosroi, Jiradej
Salowakhon, Suda
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Chiang Mai Univ, STRI, NPRDC, Chiang Mai 50200, ThailandChiang Mai Univ, Fac Pharm, Chiang Mai 50200, Thailand
Salowakhon, Suda
Manosroi, Aranya
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Chiang Mai Univ, Fac Pharm, Chiang Mai 50200, Thailand
Chiang Mai Univ, STRI, NPRDC, Chiang Mai 50200, ThailandChiang Mai Univ, Fac Pharm, Chiang Mai 50200, Thailand