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vol.29 número2CARACTERÍSTICAS MORFOLÓGICAS E PRODUTIVIDADE DA PALMA FORRAGEIRA IRRIGADA SUBMETIDA A DIFERENTES INTENSIDADES DE CORTEMODELAGEM DO CONSUMO DE COMBUSTÍVEL DO TRASPORTE FLORESTAL índice de autoresíndice de assuntospesquisa de artigos
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Revista Caatinga

versão impressa ISSN 0100-316Xversão On-line ISSN 1983-2125

Resumo

MOURA, LORENA DE OLIVEIRA et al. PHYSICOCHEMICAL CHARACTERISTICS OF PURPLE LETTUCE HARVESTED AT DIFFERENT AGES. Rev. Caatinga [online]. 2016, vol.29, n.2, pp.489-495. ISSN 0100-316X.  http://dx.doi.org/10.1590/1983-21252016v29n227rc.

Lettuce is one of the most produced and consumed leafy vegetables in Brazil. It is harvested when the plant reaches full vegetative growth and the leaves are still tender and there are no signs of bolting. The plant is unsuitable for commercialization after this period, thus, a food that is rich in vitamins, minerals and bioactive compounds such as carotenoid is lost. Therefore, the objective of this work was to assess the purple lettuce quality based on physical-chemical characteristics, in three different ages. The experiment was conducted in an urban community garden in Sete Lagoas MG, Brazil. A completely randomized experimental design was used with three replications. The treatments consisted of three development stages (20, 30 and 40 days after transplanting - DAT). The treatment with 40 DAT presented total carotenoids concentration and soluble solids content significantly higher, lower pH, and darker lettuce, with lower values of the parameter b* (increase in yellow color), and higher values of the parameter a* (increase in red color), compared to the first two treatments. The titratable acidity was statistically equal for the three evaluation periods. Considering the high concentration of carotenoids found at 40 DAT, the harvest can take place at this age.

Palavras-chave : Development stages; Lactuca sativa; Harvest time.

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