RESUMO
This study aimed to use the non-conventional microwave-assisted extraction (MAE) and pressurized liquid extraction (PLE) techniques for recovering bioactive compounds from tomato pomace, a valuable agro-industrial waste. The raw material was previously dried using a spouted bed dryer and then submitted to extraction with green solvents. A response surface methodology (RSM) performed the optimization of MAE and PLE. Next, the yield and the antioxidant activity results were maximized, and the lycopene content of the optimum MAE and PLE extracts was assessed by high-performance liquid chromatography (HPLC). Additionally, a fraction of raw material was oven dried as a comparison. The PLE extract exhibited the highest antioxidant activity, whereas the MAE extract showed the highest lycopene content (59.66 µg lycopene/g extract), which represents a 66.93% lycopene recovery compared to a standard technique with acetone. The remarkable results show that the non-conventional drying and extraction techniques were effective in valorizing this neglected material.
RESUMO
Amostras de sangue e de plasma bovino foram avaliadasmicrobiologicamente, visando o uso destas fontes protéicas em alimentaçäo humana. Foram realizadas análises de contagem total de bactérias aeróbias mesófilas, determinaçäo do Número mais Provável de coliformes totais e fecais e pesquisa de Samonellas sp. Os baixos níveis de contaminaçäo permitem dizer que, nas condições do presente trabalho, o sangue bovino bem como o plasma, obtido por centrifugaçäo deste, apresentaram condições de uso em alimentaçäo