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Resumo(s)
Since quince is a fruit relatively susceptible to browning, in the present work it was
evaluated the colour of the quince over time of exposure to the atmospheric air. The colour of the
fresh pulp was assessed using a handheld tristimulus colorimeter using the CIELab colour
coordinates: L*a*b*. These Cartesian coordinates were then used to calculate the polar or cylindrical
coordinates: value, hue angle (º) and chroma. At each instant, ten measurements of colour were
made, and to evaluate the colour change, measurements were repeated in the same samples after
every 5 minutes, over a period of two hours. The results obtained for the medium values of the
cylindrical coordinates in the freshly cut quince were found to be: value = 7.80, chroma = 31.78 and
Hue = 92.28º, being these values determined right after cutting. Total colour difference (TCD) was
calculated having the values of the Cartesian coordinates of the freshly cut quince as reference. In
relation to the colour change, the values for TCD were 0.00, 26.35, 30.41, 31.81 and 32.39,
respectively for times 0, 30, 60, 90 and 120 minutes, indicating a faster rate initially and a tendency for
stabilization towards the end of the period analyzed.
Descrição
Palavras-chave
quince browning colour broening kinetics
Contexto Educativo
Citação
1. Guiné RPF, Barroca MJ. (2012) Evaluation of browning rate of quince at ambient exposure. Livro de Resumos e CD de Proceedings do 6th Central European congress on Food - CEFood, p. 382-387.