ABSTRACT
The aim of this work was to study the enrichment of Spirulina platensis in wheat flour to prepare fresh pasta to evaluate the green color and nutritional enrichment in addition to functional properties due to the presence of the bioactive compounds in the cyanobacterium. The pastas were evaluated for the centesimal composition, microbiological contamination, sensorial acceptance and technological characteristics such as cooking time, water absorption, volume displacement and loss of solids. The superior protein contents and the satisfactory technological and sensorial attributes compared with the control with no cyanobacterium showed the usefulness of incorporating S. platensis biomass in the fresh pastas. The microbiological quality was in compliance with the legislation in force. The sensorial quality was considered satisfactory (liked very much) and purchase intention high (probably would buy).
ABSTRACT
The effects of light intensity and temperature in S. platensis cultivation with potassium nitrate or urea as nitrogen source were investigated, as well as the biomass chlorophyll contents of this cyanobacteria, through the Response Surface Methodology. Experiments were performed at temperatures from 25 to 34.5ºC and light intensities from 15 to 69 µmol photons m-2 s-1, in mineral medium. In cultivations with both sources of nitrogen, KNO3 and urea, statistic evaluation through multiple regression, no interactions of such independent variables were detected in the results of the dependent variables maximum cell concentration, chlorophyll biomass contents, cell and chlorophyll productivities, as well as in the nitrogen-cell conversion factor. In cultivation performed with both sources of nitrogen, it was possible to obtain satisfactory adjustments to relate the dependent variables to the independent variables. The best results were achieved at temperature of 30ºC, at light intensity of 60 µmol photons m-2s-1, for cell growth, with cell productivity of approximately 95 mg L-1 d-1 in cultivations with urea. For the chlorophyll biomass content, the most adequate light intensity was 24 µmol photons m-2 s-1.
Subject(s)
Biomass , Chlorophyll , Cyanobacteria/isolation & purification , Kali Nitricum , Nitrogen Fixation , Spirulina , Methods , MethodsABSTRACT
Foram estudados os processos descontinuo e descontinuo alimentado de fermentacao alcoolica, utilizando-se mosto de melaco de cana de acucar e Saccaromyces cerevisiae na forma de fermento prensado. Foram analisados a influencia da vazao de alimentacao exponencialmente decrescente, do tempo de enchimento e do nivel de inoculo no comportamento do sistema, considerando os seguintes parametros: produtividades em etanol e em celulas; rendimento em etanol; fator de conversao de substrato em celulas. Para o processo descontinuo alimentado, o valor maximo atingido para a produtividade em etanol foi de 16,9 g/L.h. Os resultados obtidos de rendimentos e produtividades em etanol foram semelhantes para os processos descontinuo e descontinuo alimentado (com tempo de enchimento de 3 h e constante de tempo de '1,6 h POT. -1')