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STABILITY OF ANTHOCYANINS FROM AGROINDUSTRIAL RESIDUE OF ISABEL GRAPE GROWN IN SÃO FRANCISCO VALLEY, BRAZIL Rev. Bras. Frutic.
BASTOS,RAFAELLA DA SILVA; OLIVEIRA,KARLLA KARINNE GOMES DE; MELO,ENAYDE DE ALMEIDA; LIMA,VERA LÚCIA ARROXELAS GALVÃO DE.
ABSTRACT Grape by-products are promising and sustainable sources of anthocyanins. Considering the factors related to degradation of those pigments, spectrophotometric and kinetic analyzes were carried out with the aim to evaluate the light and heat stability of anthocyanins from Isabel grape residue. We found that the exposure to luminosity (80W; 2500 lux) and high temperature (= 70ºC) significantly affected the absorption and content of those compounds (p <0.05), whose the most stable condition was obtained at 50°C (t1/2: 37.7h; k: 1.84 x 10-2 h-1) and protected from light (t1/2: 3,320.6h; k: 2.09 x 10-4 h-1). Therefore, the anthocyanins from the agroindustrial residue of Isabel grape are an alternative of natural colorants for food that can be...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vitis labrusca; Kinetics; Thermal degradation; Light.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000100903
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Thermogravimetric analysis for characterization of the pellets produced with different forest and agricultural residues Ciência Rural
Brand,Martha Andreia; Barnasky,Ricardo Ritter de Souza; Carvalho,Carolina Alves; Buss,Rodrigo; Waltrick,Deyvis Borges; Jacinto,Rodolfo Cardoso.
ABSTRACT: The pelleting of forest and agricultural materials, mainly because many residues from both industries can be used in this process, has been an alternative in obtaining added value products to energy generation. Thus, the aim of this study was to evaluate the energy quality of the pellets produced from forest and agricultural residues as raw materials and to verify the utility of the thermogravimetric analysis (TGA) and the differential thermogravimetric analysis (DTG) in characterizing the behavior of the pellets during the combustion process. Four residues were used: (1) Pinus spp. woodchips, (2) apple pruning residues, (3) aciculated dry branches of Araucaria angustifolia and (4) A. angustifolia empty-seeds. Chemical composition of the raw...
Tipo: Info:eu-repo/semantics/article Palavras-chave: TGA; DTG; Thermal degradation; Residues.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001100300
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