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Preparações oftálmicas – novas estratégias para a promoção da biodisponibilidade

Almeida, Hugo; Silva, Ana Catarina; Amaral, Maria Helena; Lobão, Paulo; Lobo, José Manuel Sousa

As preparações oftálmicas apresentam como principal vantagem o facto de poderem ser facilmente administradas pelo paciente. No entanto, estas preparações apresentam várias desvantagens, entre as quais se destaca o tempo de residência diminuto da formulação na superfície do globo ocular, o que condiciona a eficácia do fármaco veiculado. Desta forma, existem diversas estratégias que podem ser adotadas para aument...

Date: 2021   |   Origin: Acta Farmacêutica Portuguesa

Applications of polymeric and lipid nanoparticles in ophthalmic pharmaceutical ...

Almeida, Hugo; Amaral, Maria Helena; Lobão, Paulo; Silva, Ana Catarina; Lobo, José Manuel Sousa

The unique properties and characteristics of ocular tissues and the whole set of defence mechanisms of the ocular globe make the instillation of ocular drugs into a difficult task with a low rate of therapeutic response. One of the challenges for the new generation of ophthalmic pharmaceutical formulations is to increase the bioavailability of drugs administered by the ocular route and, therefore, their therape...


Comparative study of sustained-release lipid microparticles and solid dispersio...

Almeida, Hugo; Amaral, Maria Helena; Lobão, Paulo

O ibuprofeno é um dos antiinflamatórios não esteróides mais utilizados no tratamento de patologias associadas a processos inflamatórios. Este fármaco, quando no seu estado puro, apresenta características físicas e mecânicas pouco satisfatórias e a sua utilização em formas sólidas só é possível se forem adicionados excipientes que permitam melhorar estas propriedades. A seleção dos excipientes ideais e da forma ...

Date: 2012   |   Origin: Oasisbr

Liposomes as a Model for the Biological Membrane: Studies on Daunorubicin Bilay...

Matos, Carla; Moutinho, Carla; Lobão, Paulo

In this study the interaction of the antitumoral drug daunorubicin with egg phosphatidylcholine (EPC) liposomes, used as a cell membrane model, was quantified by determination of the partition coefficient (K(p)). The liposome/aqueous-phase K(p) of daunorubicin was determined by derivative spectrophotometry and measurement of the zeta-potential. Mathematical models were used to fit the experimental data, enablin...


Drugs obtained by biotechnology processing

Almeida, Hugo; Amaral, Maria Helena; Lobão, Paulo

In recent years, the number of drugs of biotechnological origin available for many different diseases has increased exponentially, including different types of cancer, diabetes mellitus, infectious diseases (e.g. AIDS Virus / HIV) as well as cardiovascular, neurological, respiratory, and autoimmune diseases, among others. The pharmaceutical industry has used different technologies to obtain new and promising ac...

Date: 2011   |   Origin: Oasisbr

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