No abstract

No abstract

A lithium ferrite with the general formula LiFe5O8 was prepared by a new variation of the ceramic method, in which high-energy mechanical milling and calcinations of Li2CO3 and Fe2O3 were used. In this paper, we present a study of the structural and electrical properties of this ceramic phase. We also investigate the effects of the use of galactomannan as a new binding option as compared with a traditional binding material like glycerol.

Resumo. As plantas medicinais vêm acompanhando a humanidade desde a sua existência, sendo utilizadas como: remédios, rituais, tinturas, dentre outras. Cientistas de todo o mundo estudam o efeito medicinal de diversas plantas. A planta Morinda citrifolia Linn., conhecida popularmente como noni, apresenta na medicina empírica diversas capacidades farmacológicas a fim de curar enfermos. Esta pesquisa busca identificar metabólitos secundários bioativos presentes na folha e fruto do noni, e avaliar apenas o potencial antioxidante da folha. Os materiais vegetais, folhas e frutos foram coletados no horto de plantas medicinais do IFCE -Campus Quixadá. Fez-se extração etanólica (75%), testes fitoquímicos da folha e do fruto e somente determinação antioxidante pelo método DPPH da folha. O fruto apresentou resultado positivo para catequinas, flavonas, flavonóis, leucoantocianidinas, saponinas, taninos flobabê-nicos e xantonas, já a folha apresentou resultado positivo para flavonas, flavonóis, saponinas, taninos flobabênicos, xantonas mas também demonstrou eficiente capacidade antioxidante possuindo EC 50 igual a 4,27 ± 0,004 g/L e linearidade de 99,54%. Sugere-se que a folha e o fruto sejam eficazes para o desenvolvimento de setores alimentícios e farmacêuticos, pois apresentam constituintes fitoquímicos e antioxidantes capazes de combater e prevenir enfermidades.Palavras-chaves: Antioxidante. Metabólitos Secundários. Morinda citrifolia Linn. Plantas Medicinais.Abstract. Medicinal plants have accompanied humanity since its existence, being used as medicines, rituals, dyes, among others. Scientists around the world are studying the effect of various medicinal plants. The Morinda citrifolia Linn. plant, commonly known as noni presents empirical medicine several pharmacological capabilities in order to heal the sick. This research aims to identify bioactive secondary metabolites present in the leaf and fruit of noni, and evaluate only the antioxidant potential of the sheet. The plant material, leaves and fruits were collected in the garden of medicinal plants IFCECampus Quixadá. There was ethanol extraction (75%), phytochemicals tests of leaf and fruit and only determination antioxidant of sheet, by the method DPPH. The fruit has a positive result for catechins, flavones, flavonoids, leucoanthocyanidins, saponins, tannins and xanthones, since the sheet was positive for flavones, flavonols, saponins, tannins, xanthones but also demonstrated efficient antioxidant capacity having EC 50 equal to 4,27 ± 0,004 g/L and linearity 99.54%. It is suggested that leaf and fruit are effective for the development of food and pharmaceutical sectors, as they present phytochemical constituents and antioxidants can combat and prevent diseases.

No abstract