The possibility of commercialization of Moro blood oranges in tropical countries such as Brazil was evaluated to verify whether post-harvest management through storage at low temperatures for a period of 60 days can i...The possibility of commercialization of Moro blood oranges in tropical countries such as Brazil was evaluated to verify whether post-harvest management through storage at low temperatures for a period of 60 days can improve the bioactive properties and quality parameters. Moro blood oranges cultivated in Brazil did not contain significant amounts of anthocyanins at the time of harvesting, but these compounds were activated by post-harvest management through storage at low temperatures (4°C and 8°C) for a period of 60 days. The emergence of the anthocyanins in the juices occurred within a few weeks of storage, but the maximum levels were attained after 60 days and at the temperature of 8°C. Cold storage positively influenced other bioactive compounds such as total phenolic compounds, individual phenolic compounds, β-carotene and the antioxidant activity determined by the sequestration of DPPH free radicals. It did not influence the vitamin C content. In addition, storage significantly altered the color, total acidity and pH of the fruits, but it did not prevent its commercial use. The remaining quality parameters were not influenced. It is possible to commercialize these oranges in Brazil through post-harvest management.展开更多
Essential oils from Mentha piperita, Cymbopogon citratus, Rosmarinus officinalis, Peumus boldus and Foeniculum vulgare were extracted by hydrodistillation, chemically characterized and quantified by GC/MS and GC/FID. ...Essential oils from Mentha piperita, Cymbopogon citratus, Rosmarinus officinalis, Peumus boldus and Foeniculum vulgare were extracted by hydrodistillation, chemically characterized and quantified by GC/MS and GC/FID. The principal componentes in the essential oil of M. piperita (carvone and limonene), C. citratus (geranial, neral and myrcene), R. officinalis (1,8-cineole, camphor and α-pinene), P. boldus (α-terpinyl formate, p-cymene and 1,8-cineole) and F. vulgare (methyl chavicol, limonene and fenchone) were identified. The oils were tested for antioxidant activity employing the DPPH (2,2-diphenyl-1-picryl-hydrazyl) radical-capture method, the oxidation of the β-carotene/linoleic acid system, and the ABTS radical-capture method. The essential oils were not effective. The antioxidant activities of the oils were determined by the hydroxyl method, and the highest activity (62.80%) was observed with the essential oil from M. piperita. Activities of 1.54 and 1.82 μg μg-1, respectively, were observed for the essential oils from C. citratus and P. Boldus using the phosphomolybdenum method. No activity was observed with respect to reducing power. The essential oil from C. citratus was effective in inhibiting the growth of L. monocytogenes (15.63 mg·L-1), S. choleraesuis (15.63 mg·L-1) and E. coli (31.25 mg·L-1), and the essential oil from P. boldus inhibited the growth of S. aureus (62.5 mg·L-1). No essential oil inhibited the growth of P. aeruginosa. A low antioxidant activity and a promising antibacterial activity were observed for these essential oils.展开更多
基金the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico(CNPQ),the Fundacao de Amparo a Pesquisa do Estado de Minas Gerais(FAPEMIG),and the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior(CAPES)for financial support and scholarships granted.
文摘The possibility of commercialization of Moro blood oranges in tropical countries such as Brazil was evaluated to verify whether post-harvest management through storage at low temperatures for a period of 60 days can improve the bioactive properties and quality parameters. Moro blood oranges cultivated in Brazil did not contain significant amounts of anthocyanins at the time of harvesting, but these compounds were activated by post-harvest management through storage at low temperatures (4°C and 8°C) for a period of 60 days. The emergence of the anthocyanins in the juices occurred within a few weeks of storage, but the maximum levels were attained after 60 days and at the temperature of 8°C. Cold storage positively influenced other bioactive compounds such as total phenolic compounds, individual phenolic compounds, β-carotene and the antioxidant activity determined by the sequestration of DPPH free radicals. It did not influence the vitamin C content. In addition, storage significantly altered the color, total acidity and pH of the fruits, but it did not prevent its commercial use. The remaining quality parameters were not influenced. It is possible to commercialize these oranges in Brazil through post-harvest management.
基金The authors acknowledge the support of the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior(CAPES)in the form of a PVNS fellowshipthe Conselho Nacional de Desenvolvimento Cientifico e Tecnologico(CNPq) the Fundacao de Amparo a Pesquisa do Estado de Minas Gerais(FAPEMIG)for financial support.
文摘Essential oils from Mentha piperita, Cymbopogon citratus, Rosmarinus officinalis, Peumus boldus and Foeniculum vulgare were extracted by hydrodistillation, chemically characterized and quantified by GC/MS and GC/FID. The principal componentes in the essential oil of M. piperita (carvone and limonene), C. citratus (geranial, neral and myrcene), R. officinalis (1,8-cineole, camphor and α-pinene), P. boldus (α-terpinyl formate, p-cymene and 1,8-cineole) and F. vulgare (methyl chavicol, limonene and fenchone) were identified. The oils were tested for antioxidant activity employing the DPPH (2,2-diphenyl-1-picryl-hydrazyl) radical-capture method, the oxidation of the β-carotene/linoleic acid system, and the ABTS radical-capture method. The essential oils were not effective. The antioxidant activities of the oils were determined by the hydroxyl method, and the highest activity (62.80%) was observed with the essential oil from M. piperita. Activities of 1.54 and 1.82 μg μg-1, respectively, were observed for the essential oils from C. citratus and P. Boldus using the phosphomolybdenum method. No activity was observed with respect to reducing power. The essential oil from C. citratus was effective in inhibiting the growth of L. monocytogenes (15.63 mg·L-1), S. choleraesuis (15.63 mg·L-1) and E. coli (31.25 mg·L-1), and the essential oil from P. boldus inhibited the growth of S. aureus (62.5 mg·L-1). No essential oil inhibited the growth of P. aeruginosa. A low antioxidant activity and a promising antibacterial activity were observed for these essential oils.
