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2.
Mater Sci Eng C Mater Biol Appl ; 112: 110869, 2020 Jul.
Article in English | MEDLINE | ID: mdl-32409038

ABSTRACT

The combination of chitosan (C) with alginate (A) has been explored for the production of dressings due to the positive results on wound healing. CA films can show a dense or porous flexible structure, with characteristics tunable for different applications. Porosity and flexibility can be achieved, respectively, by the addition of surfactants such as Kolliphor® P188 (P) and silicone-based compounds as Silpuran® 2130 A/B (S). Furthermore, composite matrices of these polysaccharides have potential applications as devices for releasing bioactive compounds to skin lesions. The purpose of this study was to evaluate the physicochemical and biological characteristics of flexible dense and porous CA membranes incorporating the standardized extract of Arrabidaea chica Verlot (A. chica), and also to analyze the release mechanism of the extract from different membrane formulations. The results show that the inclusion of P in the formulation allows obtaining porous matrices, promotes greater homogeneity of the mixture of the silicone gel with the suspension of polysaccharides, and increases the swelling of the polymer matrix. All formulations presented high stability, reaching a maximum mass loss of 18% after seven days. The formulations with S showed the best performance in terms of flexibility and strain at break. The presence of A. chica standardized extract did not affect negatively the characteristics of the membranes. Incorporation efficiencies of the bioactive compound above 87% were achieved, and the addition of P and S to the membrane formulation changed the release of the A. chica extract kinetics. In addition, the developed formulations did not significantly affect Vero cells proliferation.


Subject(s)
Alginates/chemistry , Bignoniaceae/chemistry , Chitosan/chemistry , Membranes, Artificial , Plant Extracts/chemistry , Animals , Bignoniaceae/metabolism , Cell Survival/drug effects , Chlorocebus aethiops , Drug Carriers/chemistry , Drug Carriers/toxicity , Methylene Blue/chemistry , Methylene Blue/metabolism , Plant Extracts/metabolism , Porosity , Surface-Active Agents/chemistry , Tensile Strength , Vero Cells
3.
Rev. paul. acupunt ; 2(1): 13-24, 1996. tab, graf
Article in Portuguese | LILACS | ID: lil-184452

ABSTRACT

O presente estudo tem a finalidade de avaliar o efeito do tratamento pela acupuntura na evoluçao da hérnia do disco intervertebral lombar. Material - Foram estudados 41 pacientes com quadro clínico de lombalgia com dor irradiada para os membros inferiores. Os pacientes foram classificados em dois grupos: Grupo I - quando apresentavam quadro clínico e tomográfico compatíveis com o diagnóstico isolado de hérnia do disco intervertebral lombar (HDIVL). Grupo II - composto por pacientes que apresentavam quadro clínico e tomográfico compativeis com o diagnóstico de hérnia do disco intervertebral lombar associada com osteoartrose da coluna lombar (HDIVL+OAL). Método - Foram selecionados os seguintes pontos de acupuntura para todos os pacientes, por terem açao genérica sobre as várias formas de lombalgia com irradiaçao para os membros inferiores: M-BW-35 (Jiaji) dois pontos acima e abaixo do nível da lesao das raízes nervosas, VG-2 (Yaoshu), VG-4 (MingMen), VB-30 (Huantiao), B-54 (Weizhong), B-60 (Kunlun), R-2 (Rangu), R-3 (Taixi), ID-3 (Houxi) e M-HN-3 (Yintang). Para o tratamento especifico do canal de energia afetado, foram adicionados os seguintes pontos de acupuntura: para o canal de energia da Vesicula Biliar: TA-2 (Yemen), TA-3 (Zhongzhiz), VB-41 (Linqi), VB-43 (Xiaxi); para o canal de energia do Estômago: IG-2 (Erjian), IG-3 (Sanjian), E-43 (Xiangu), E-44 (Neiting); para o canal de energia da Bexiga: ID-2 (Qiangu), ID-3 (Houxi), B-65 (Shugu), B-66 (Tonggu). Resultados - A análise estatística nao paramétrica dos resultados obtidos no tratamento de parâmetros subjetivos (intensidade da dor; dificuldade de andar, de correr, teste de Naffziger; manobra de Valsalva), como também dos parâmetros objetivos (teste de elevaçao da perna retificada), evidenciou uma melhora significante em todos os parâmetros estudados. O parâmetro mais refratário ao tratamento foi a dificuldade de correr. Os resultados nao diferiram significantemente, em relaçao ao tamanho da hérnia do disco intervertebral lombar.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Osteoarthritis/therapy , Acupuncture Therapy , Back Pain/therapy , Intervertebral Disc Displacement/therapy , Lumbar Vertebrae , Acupuncture Points , Treatment Outcome , Analysis of Variance , Pain Measurement
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