Bioadhesive Films Containing Benzocaine: Correlation Between In Vitro Permeation and In Vivo Local Anesthetic Effect

Autor(es)

de Araujo, Daniele Ribeiro ^{[1, 2]} ; Padula, Cristina ^[3] ; Saia Cereda, Cintia Maria ^[1] ; Tofoli, Giovana Radomille ^[4] ; Brito, Jr., Rui Barbosa ^[5] ; de Paula, Eneida ^[1] ; Nicoli, Sara ^[3] ; Santi, Patrizia ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Dept Biochem, Campinas, SP - Brazil

^[2] Univ Fed Abc, Human & Nat Sci Ctr, Santo Andre, SP - Brazil

^[3] Univ Parma, Dept Pharm, I-43124 Parma - Italy

^[4] Univ Sao Francisco, UNIFAG, Clin Pharmacol & Gastroenterol Unit, BR-12900000 Braganca Paulista, SP - Brazil

^[5] Fac Dent, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PHARMACEUTICAL RESEARCH; v. 27, n. 8, p. 1677-1686, AUG 2010.
• Citações Web of Science: 22

Resumo

The aim of this work was to develop anesthetic bioadhesive films containing benzocaine and study their in vitro skin permeation and in vivo performance, in comparison with commercial formulations. Films containing 3% and 5% w/w of benzocaine were prepared and characterized by weight, drug content, thickness and morphology. In vitro permeation assays were performed in vertical diffusion cells using full-thickness pig ear skin as barrier. Intensity and duration of analgesia were evaluated in rats by tail-flick test, and skin histological analysis was carried out. Tail-flick test showed that the duration of benzocaine-induced analgesia was significantly prolonged with the films compared to commercial creams, in agreement with the higher in vitro permeation. Histological analysis of the rat tail skin did not reveal morphological tissue changes nor cell infiltration signs after application of the commercial creams or films. Results from our study indicate that the films developed in this work can be considered as innovative dermal/transdermal therapeutic systems for benzocaine local delivery. (AU)

• Processo FAPESP: 06/00121-9 - Novas formulações de anestésicos locais de liberação controlada: do desenvolvimento ao teste clínico odontológico
• Beneficiário: Eneida de Paula
• Modalidade de apoio: Auxílio à Pesquisa - Temático