RESUMO
Nanodiamonds are novel nanosized carbon building blocks possessing varied fascinating mechanical, chemical, optical and biological properties, making them significant active moiety carriers for biomedical application. These are known as the most'captivating' crystals attributed to their chemical inertness and unique properties posing them useful for variety of applications in biomedical era. Alongside, it becomes increasingly important to find, ascertain and circumvent the negative aspects associated with nano-diamonds. Surface modification or functionalization with biological molecules plays a significant role in managing the toxic behavior since nanodiamonds have tailorable surface chemistry. To take advantage of nanodiamond potential in drug delivery, focus has to be laid on its purity, surface chemistry and other considerations which may directly or indirectly affect drug adsorption on nanodiamond and drug release in biological environment. This review emphasizes on the basic properties, synthesis techniques, surface modification techniques, toxicity issues and biomedical applications of nanodiamonds. For the devel-opment of nanodiamonds as an effective dosage form, researchers are still engaged in the in-depth study of nanodiamonds and their effect on life interfaces.
RESUMO
The objective of the research was to formulate and evaluate selegiline hydrochloride loaded chitosan nanoparticles for the Parkinson's therapy in order to improve its therapeutic effect and reducing dosing frequency. Taguchi method of design of experiments (L9 orthogonal array) was used to get optimized formulation. The selegiline hydrochloride loaded chitosan nanoparticles (SHPs) were prepared by ionic gelation of chitosan with tripolyphosphate anions (TPP) and tween 80 as surfactant. The SHPs had a mean size of (303.39 ± 2.01) nm, a zeta potential of +32.50mV, and entrapment efficiency of SHPs was 86.200 ± 1.38%. The in vitro drug release of SHPs was evaluated in phosphate buffer saline (pH 5.5) using goat nasal mucosa and found to be 82.529% ± 1.308 up to 28 h. Release kinetics studies showed that the release of drug from nanoparticles was anomalous (non-fickian) diffusion indicating the drug release is controlled by more than one process i.e. superposition of both phenomenon, the diffusion controlled as well as swelling controlled release. SHPs showed good stability results as found during stability studies at different temperatures as mentioned in ICH guidelines. The results revealed that selegiline hydrochloride loaded chitosan nanoparticles are most suitable mode of delivery of drug for promising therapeutic action.
O objetivo da pesquisa foi formular e avaliar nanopartículas de quitosana contendo cloridrato de selegilina para terapia do Parkinson, a fim de melhorar o seu efeito terapêutico e reduzir a frequência de dosagem. Método de Taguchi, de planejamento experimental, (L9 matriz ortogonal) foi usado para obter a formulação otimizada. As nanopartículas de quitosana contendo cloridrato de selegilina (PCHs) foram preparadas por gelificação iônica de quitosana com ânions tripolifosfato (TPP) e Tween 80 como tensoativo. As PCHs apresentaram tamanho médio de (303.39 ± 2,01) nm, potencial zeta de +32.50 mV e eficiência de encapsulação de 86.200±1,38%. A liberação do fármaco in vitro foi avaliada em solução salina de tampão fosfato (pH 5,5), usando a mucosa nasal de cabra e o resultado encontrado foi de 82.529% ± 1.308, acima de 28 h. Estudos de cinética de liberação mostraram que a liberação do fármaco das nanopartículas foi por difusão anômala (não fickiana), indicando que é controlada por mais de um processo, ou seja, a superposição dos fenômenos de difusão controlada e intumescimento. As PCHs mostraram resultados de boa estabilidade, encontrada durante os estudos de estabilidade em temperaturas diferentes, como mencionado em diretrizes do ICH. Os resultados revelaram que o sistema de nanopartículas de quitosana contendo cloridrato de selegilina é o mais adequado sistema de liberação de fármacos de ação terapêutica promissora.