ABSTRACT
The objective of this study was to characterize the nutritional compounds of interest present in vegetables known as non-conventional, in Brazil. The following evaluations were carried out: antioxidant activity, phenolic compounds, vitamin C, calories, carbohydrates, humidity, lipids, proteins, fiber, acidity and quantification of minerals (P, K, Ca, Mg, S, Cu, Fe, Mn, Zn and B). The species studied were Amaranthus hybridus L., Amaranthus viridis L., Basella alba L., Eryngium campestre L., Hibiscus sabdariffa L., Lactuca canadensis L., Rumex acetosa L., Stachys byzantina K. Koch, Tropaeolum majus L. and Xanthosoma sagittifolium L. Representative samples of plant structures of interest were harvested from each species suitable for human consumption such as leaves, flowers and flower buds. The results were submitted to multivariate analysis - principal components analysis (PCA). All the species present nutritional compounds of interest in different levels among the evaluated structures.
Subject(s)
Flowers/chemistry , Magnoliopsida/chemistry , Nutritive Value , Plant Shoots/chemistry , Vegetables/chemistry , Amaranthus/chemistry , Antioxidants/metabolism , Ascorbic Acid/analysis , Brazil , Caryophyllales/chemistry , Dietary Fiber/analysis , Eryngium/chemistry , Hibiscus/chemistry , Minerals/analysis , Phenols/analysis , Plant Leaves/chemistry , Rumex/chemistry , Stachys/chemistry , Tropaeolum/chemistry , Xanthosoma/chemistryABSTRACT
ABSTRACT: The aim of the present study was to estimate the energy balance (output/input ratio) of the canola crop for biodiesel production, under Brazilian conditions. Fossil energy expended in the production of 600kg of oil per hectare was 7,146,537kcal. The estimated energy yield per hectare was 9,930,000kcal from the production of 1,500kg ha-1 of seeds (40% oil and 60% oil cake), which resulted in an energy balance of 1.39. Results indicated the viability of biofuel production from canola, but also showed the need to improve the technology used to increase the energy and economic balance ratios.
RESUMO: O objetivo do trabalho foi estimar o balanço energético (razão output/input) da cultura da canola, nas condições brasileiras, para a produção de biodiesel. A energia fóssil dispendida na produção de 600kg de óleo por hectare foi de 7.146.537kcal. O rendimento energético estimado por hectare foi de 9.930.000kcal, a partir da produtividade de 1.500kg ha-1 de grãos (40% de óleo e 60% de torta), resultando no valor do balanço energético de 1,39. Os resultados indicam a viabilidade da produção do biocombustível com base na respectiva cultura, mas demonstram também a necessidade de aperfeiçoamento das tecnologias empregadas para que se aumentem os índices dos balanços energético e econômico.
