This study aimed to macroscopically and microscopically evaluate the healing of skin wounds induced in rats by topical application of cassava polyamide biopolymer hydrogel. In total, 32 rats were used and divided into four groups (n= 8): negative control - saline solution; positive control - use of commercial ointment; experimental group - I - ointment + cassava hydrogel; experimental group - II - cassava hydrogel. A 1cm2 wound induced on the animals dorsum was treated and evaluated. At day 21 post-operation, the animals were sacrificed by anesthetic overdose, and then 1cm2 of cicatricial skin from the wound region was collected. The material was cut to evaluate healing. In the macroscopic evaluation, complete healing was observed at the end of 21 days. Re-epithelialization was observed histologically; the connective tissue in the negative control, positive, and experimental - I groups was characterized by an abundance of collagen fibers, fibroblasts, and blood vessels. In experimental group - II additional healing was observed, as evidenced by the arrangement of collagen fibers and fibroblasts, and the reduction of neoformed vessels. Thus, we concluded that the hydrogel can assist in healing skin wounds, especially in the remodeling phase.

POSSAMAI, M. C. F.; SANTOS, G. R.; OTUTUMI, L. K.; PIAU JÚNIOR, R.; ALMA-DA, A. F. B.; GERMANO, R. de M. Avaliação da peroxidação lipídica no plasma de ratos submetidos à lesão tecidual e tratados com hidrogel de poliamido de mandioca. Arq. Ciênc. Vet. Zool. UNIPAR, Umuarama, v. 19, n. 3, jul./ set. 2016. RESUMO:As espécies reativas ao oxigênio (EROS) são produzidas como mecanismo de defesa celular, participando dos processos de cicatrização celular. Entretanto, altos níveis de EROS podem causar danos como a peroxidação lipídica (PL). O presente estudo teve como objetivo, verificar os níveis de PL por meio da determinação das substâncias reativas ao ácido tiobarbitúrico (TBARS) no plasma de ratos com lesão tecidual induzida. Foram utilizados 32 ratos machos, Rattus norvegicus albinus da linhagem Wistar, os quais foram pesados e da média ± 10% do peso foram distribuídos em quatro grupos: A -controle negativo; B -Vetaglós ® ; C -hidrogel de poliamido de mandioca+ Vetaglós ® ; D -Hidrogel de poliamido de mandioca. Após 21 dias, todos os animais foram anestesiados com isoflurano e foi feita a coleta de sangue por punção cardí-aca, e os plasmas foram obtidos após centrifugação, na sequência por superdosagem do anestésico foi realizada a eutanásia. Os níveis de PL nos plasmas dos ratos foram determinados pelo método do TBARS. Não houve diferença significativa entre os grupos em relação à PL, indicando um equilíbrio entre as defesas antioxidantes celulares e os níveis de EROS produzidos durante o processo de cicatrização celular. Essa ausência nos diferentes grupos experimentais, em relação à PL, deixa claro a importância de se contemplar estudos de parâmetros de bioindicadores de estresse oxidativo em protocolos experimentais. PALAVRAS-CHAVE: Antioxidantes. Cicatrização. EROS. Malondialdeído. LIPID PEROXIDATION IN PLASMA OF RATS SUBMITTED TO TISSUE INJURY AND TREATED WITHCASSAVA POLYAMIDE HYDROGEL ABSTRACT: Reactive oxygen species (ROS) are produced as a cellular defense mechanism, participating in the processes of cellular healing. However, high levels of ROS can cause damages such as lipid peroxidation (LPO). This study aimed to verify the levels of LPO through the determination of reactive substances to thiobarbituric acid (TBARS) in rat plasma with induced tissue injury. A total of 32 Rattus norvegicus albinus Wistar were used, with a mean weight ± 10%. They were divided into four groups: A -negative control; B -Vetaglós ® ; C -Polyamide cassava; D -Polyamide cassava + Vetaglós ® . After 21 days, all animals were anesthetized with isoflurane and blood was collected by cardiac puncture. Plasma was obtained after centrifugation. Euthanasia was performed with administration of an overdose of inhalational anesthetic previously used. The LPO levels in rat plasma were determined using the TBARS method. There was no significant difference between the groups in relation to LPO, indicating a balance between antioxidant defenses and cellular levels of ROS produced during the cellular healing process. This absence in the dif...