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Deterioracao pos-colheita de mandioca. 1. Modificacoes no grau de deterioracao fisiologica

By: Contributor(s): Material type: ArticleArticleLanguage: Portuguese Description: 25(5):773-781Subject(s): LOC classification:
  • 37282
 In: Pesquisa Agropecuaria BrasileiraSummary: Se verifico el efecto del tiempo de almacenamiento y las diferencias var. en la tasa de deterioro fisiologico (DF), las actividades de peroxidasa y de polifenoloxidasa, y la cantidad de compuestos fenolicos en las raices de 3 cv. de yuca (Sonora, Guaxupe e IAC 12829), durante el almacenamiento poscosecha. Las raices se cosecharon a los 18 meses y se realizaron evaluaciones despues de 0, 2, 4, 6 y 7 dias de almacenamiento. Los cv. presentaron diferencias en cuanto a tasas de DF; el cv. Guaxupe mostro la menor tasa de oscurecimiento y Sonora la mayor. Las raices de los cv. Sonora e IAC 12829 mostraron las mayores actividades de peroxidasa y de polifenoloxidasa relacionadas con las grandes cantidades de compuestos fenolicos. Se presentaron alteraciones en los componentes quimicos durante el periodo de almacenamiento, en relacion con los diferentes cv. Tanto los resp. valores de actividad como las alteraciones quimicas durante el almacenamiento fueron mayores para peroxidasa que para la enzima polifenoloxidasa. (RA-CIAT)Summary: The effect of storaging time and cultivar differences in the rate of physiological deterioration (PD), peroxidase and polyphenoloxidase activities, and amount of phenolics in the roots of three cassava cultivars (Sonora, Guaxupe and IAC 12829), during the post-harvest storaging period were verified. Roots were harvested at 18 months old and the evaluations were made at 0, 2, 4, 6 and 7 days after storaging. Cultivars presented differences concerning rate of PD, with cv. Guaxupe showing the least rate of browning and Sonora the greatest. Roots of the cultivars Sonora and IAC 12829 showed the greatest activities of peroxidase and polyphenoloxidase related to high amounts of phenolics. There were alterations in the chemical constituents during the storaging period which were related to different cultivars. Both activity values and chemical alterations during storage were higher for peroxidase than for polyphenoloxidase enzyme. (AS)
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Journal Article Journal Article CIAT Library Document collection CINFOS Document Collection CINFOS 37282 (Browse shelf(Opens below)) c.1 Short Loan 100056740
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Se verifico el efecto del tiempo de almacenamiento y las diferencias var. en la tasa de deterioro fisiologico (DF), las actividades de peroxidasa y de polifenoloxidasa, y la cantidad de compuestos fenolicos en las raices de 3 cv. de yuca (Sonora, Guaxupe e IAC 12829), durante el almacenamiento poscosecha. Las raices se cosecharon a los 18 meses y se realizaron evaluaciones despues de 0, 2, 4, 6 y 7 dias de almacenamiento. Los cv. presentaron diferencias en cuanto a tasas de DF; el cv. Guaxupe mostro la menor tasa de oscurecimiento y Sonora la mayor. Las raices de los cv. Sonora e IAC 12829 mostraron las mayores actividades de peroxidasa y de polifenoloxidasa relacionadas con las grandes cantidades de compuestos fenolicos. Se presentaron alteraciones en los componentes quimicos durante el periodo de almacenamiento, en relacion con los diferentes cv. Tanto los resp. valores de actividad como las alteraciones quimicas durante el almacenamiento fueron mayores para peroxidasa que para la enzima polifenoloxidasa. (RA-CIAT) spa

The effect of storaging time and cultivar differences in the rate of physiological deterioration (PD), peroxidase and polyphenoloxidase activities, and amount of phenolics in the roots of three cassava cultivars (Sonora, Guaxupe and IAC 12829), during the post-harvest storaging period were verified. Roots were harvested at 18 months old and the evaluations were made at 0, 2, 4, 6 and 7 days after storaging. Cultivars presented differences concerning rate of PD, with cv. Guaxupe showing the least rate of browning and Sonora the greatest. Roots of the cultivars Sonora and IAC 12829 showed the greatest activities of peroxidase and polyphenoloxidase related to high amounts of phenolics. There were alterations in the chemical constituents during the storaging period which were related to different cultivars. Both activity values and chemical alterations during storage were higher for peroxidase than for polyphenoloxidase enzyme. (AS) eng

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