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| Couri,Sônia; Pinto,Gustavo Adolfo Saavedra; Senna,Lilian Ferreira de; Martelli,Hebe Labarthe. |
| The effects of cations addition on pellet morphology and polygalacturonase (PG) synthesis by Aspergillus niger 3T5B8 were studied and compared with a control system. Fe(II), Cu(II), Zn(II) and Mn(II) were added to the fermentation medium separately, and also as combined groups of cations. The addition of Fe2+ and/or Zn2+ ions was significantly positive to the enzyme production. A positive effect in the biomass content, however, was only obtained when the same metal ions were added separately. On the other hand, Cu2+ and Mn2+ ions had almost no effect on these parameters. The morphology of the pellets was studied by image processing techniques. Small pellets with small cores were usually obtained when Fe2+ and Zn2+ ions were individually or collectively... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Metal ions; Polygalacturonase; Pellet morphology. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000100005 |
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| Azeredo,Henriette Monteiro Cordeiro de; Araújo,Fátima Beatriz Silva de; Garruti,Deborah dos Santos; Queiroz,Ana Amélia Martins; Pinto,Gustavo Adolfo Saavedra. |
| Fruit preservation by hurdle technology is based on combinations of low levels of various antimicrobial factors (hurdles) acting synergistically resulting in a shelf stable high moisture, fresh-like product. The objective of this work was to evaluate the stability of mango cubes obtained by combining the following hurdles: water activity reduction, pH reduction, and chemical preservation. Tommy Atkins mangoes, previously washed, sanitized and peeled, were cut into cubes of approximately 8 cm³. The cubes were osmotically dehydrated under stirring (150 rpm) at 46ºC in a sucrose solution at 65.5oBrix added with 2% citric acid and 0.2% potassium sorbate, during two hours. The product was drained, packed in low-density polyethylene bags and stored at room... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mango; Hurdle technology; Osmotic dehydration. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542005000200015 |
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