desidratação por imersão-impregnação e secagem por convecção de goiaba osmotic dehydration and convective drying of guava
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ID: 191963
2007
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Abstract
O objetivo deste trabalho foi avaliar as características físico-químicas e sensoriais de goiabas in natura e submetidas à desidratação por imersão-impregnação e à secagem complementar por convecção, além de avaliar a estabilidade da cor das goiabas secadas após 30, 60 e 90 dias de armazenamento sob refrigeração. Amostras de goiaba foram imersas em soluções de sacarose a 0,4 e 0,5 g mL-1, sacarose a 0,3 g mL-1 + sucralose a 0,2 g L-1, açúcar invertido a 41% (p/p) e açúcar invertido sem diluição. Foram avaliados sólidos solúveis totais, acidez titulável, pH, cor, aroma, aparência, sabor e textura. O teor de sólidos solúveis totais das amostras aumentou linearmente em função do tempo de imersão, sem efeito significativo do tipo de açúcar empregado no preparo da solução. A preservação do teor de ácido cítrico foi mais pronunciada em soluções menos concentradas de sacarose. Amostras secadas não submetidas à desidratação osmótica exibiram maior alteração de cor do que aquelas previamente desidratadas. Soluções de sacarose são mais eficazes na estabilidade da cor do que as de açúcar invertido. As goiabas submetidas à desidratação por imersão-impregnação tiveram boa aceitação sensorial, e aquelas secadas apenas por convecção não foram aceitas pelos provadores.
The objective of this work was to assess physicochemical and sensory properties of fresh and osmotically dehydrated guava submitted to convective air drying. Color stability of the dried fruits was also analyzed after 30, 60 and 90 days of storage under refrigeration. Guava slices were immersed into solutions of sucrose at 0.4 and 0.5 g mL-1, of sucrose 0.3 g mL-1 + sucralose at 0.2 g L-1, of inverted sugar at 41% (w/w) and undiluted inverted sugar syrup. Total soluble solids, total titratable acidity, pH, color, aroma, appearance, flavor and texture were evaluated. Soluble solids increased linearly in function of immersion time with no effect of the type of solute employed. Less concentrated sucrose solutions showed higher citric acid preservation in guava slices. Dried samples that were not submitted to osmotic dehydration showed higher color alteration when compared to those osmotically dehydrated. Sucrose solutions were more effective in maintaining color stability than inverted sugar syrups. Osmotically dehydrated guavas were well accepted by consumers, while convective-dried guavas were rejected.
The objective of this work was to assess physicochemical and sensory properties of fresh and osmotically dehydrated guava submitted to convective air drying. Color stability of the dried fruits was also analyzed after 30, 60 and 90 days of storage under refrigeration. Guava slices were immersed into solutions of sucrose at 0.4 and 0.5 g mL-1, of sucrose 0.3 g mL-1 + sucralose at 0.2 g L-1, of inverted sugar at 41% (w/w) and undiluted inverted sugar syrup. Total soluble solids, total titratable acidity, pH, color, aroma, appearance, flavor and texture were evaluated. Soluble solids increased linearly in function of immersion time with no effect of the type of solute employed. Less concentrated sucrose solutions showed higher citric acid preservation in guava slices. Dried samples that were not submitted to osmotic dehydration showed higher color alteration when compared to those osmotically dehydrated. Sucrose solutions were more effective in maintaining color stability than inverted sugar syrups. Osmotically dehydrated guavas were well accepted by consumers, while convective-dried guavas were rejected.
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queiroz2007pesquisadesidratao
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| Authors | ;Valéria Aparecida Vieira Queiroz;Pedro Amorim Berbert;Marília Amorim Berbert de Molina;Geraldo de Amaral Gravina;Luciano Rodrigues Queiroz;Rosires Deliza |
| Journal | proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006 |
| Year | 2007 |
| DOI |
10.1590/S0100-204X2007001000016
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| URL | |
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