Hidrorresfriamento na conservação e qualidade pós-colheita de milho verde

• Ano de defesa: 2013
• Autor(a) principal: Sousa, Simone Cássia Corrêa de
• Orientador(a): Galvão, João Carlos Cardoso
• Banca de defesa: Casali, Vicente Wagner Dias , Ramos, Paula Acácia Silva , Madeira, Nildimar Gonçalves
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Fitotecnia
• Departamento: Plantas daninhas, Alelopatia, Herbicidas e Resíduos; Fisiologia de culturas; Manejo pós-colheita de
• País: BR
• Palavras-chave em Português: Vida de prateleira; Longevidade; Perecibilidade; Curva de pré-resfriamento
• Palavras-chave em Inglês: Shelf life; Longevity; Perishability; Curve precooling
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA
• Link de acesso: http://locus.ufv.br/handle/123456789/1199

The fresh cobs are susceptible to loss of water and have reduced shelf life, which increases the ultimate cost to the consumer. The aim of this study was to evaluate the effect of hydro cooling, as a technique of pre-cooling, on the postharvest of two cultivars of corn cobs, super sweet corn and dent corn stored at 5°C and 22°C, with husk and without husk wrapped with PVC film. The hydro cooling was performed by immersion of the cobs in a mixture of water and ice at 1°C. We determined the hydro cooling curve and evaluated the shelf life of the corn, the levels of soluble sugars, reducing sugars, non-reducing sugars and starch. The cob temperature stabilized at 2.5°C, obtained 70 minutes in super sweet corn without husk, 80 minutes in sweet corn with husk, 80 minutes in dent corn without husk and 90 minutes dent corn with husk. The hydro cooling and storage at 22°C, contributed in reducing the rate of chlorophyll degradation for super sweet and dent corn, and lower rates of loss of relative water content. Quantification of carbohydrates in sweet corn stored at 22°C, the hydro cooling contributed to lower rates of loss of soluble sugars and non-reducing and reduced the rate of increase of starch in both sweet corn and in dent corn . In storage at 5°C, the hydro cooling contributed in reducing the rate of decline in chlorophyll content of husk for sweet corn, in reducing the rate of loss of soluble sugars identified after the 7th day and until the 14th day for super sweet, and contributed to the lower rate of accumulation of starch in dent corn.