El color en las aceitunas negras naturales de mesa
A new method for color objective valuation in natural black olives was developed for determining the level of brownness, based on reflection intensity analysis of primary colours that compose white light (red, green and blue), according to RGB system wave lengths. Computer software's for ana...
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| Publicado en: | Revista de la Facultad de Ciencias Agrarias |
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| Autores principales: | , |
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| Acceso en línea: | https://bdigital.uncu.edu.ar/fichas.php?idobjeto=767 |
| Sumario: | A new method for color objective valuation in natural black olives was developed for determining the level of brownness, based on reflection intensity analysis of primary colours that compose white light (red, green and blue),
according to RGB system wave lengths. Computer software's for analysis of 24 bits BMP colour type digital images was used. This paper provides more information on the browning of natural olives in brine, which could be suitable in increasing process effectiveness. The method proposed is nondestructive
and rapid, which could be useful because allows that the same sample can be valuated in the time. The changes of colour in natural black olives were investigated at different degrees of maturity (pinto, red and black), at dissimilar
values of pH (3.6 - 4.0 - 4.5), and exposed to aeration during increasing periods of time. The degree of darkening through Indices of Intensity of Reflection (IIR) was quantified. The evolution of the reflection index (IIR) based
on time generated a polynomial curve of 4° degree, which reveals the sigmoid behaviour of enzymatic browning phenomenon, with maximal correlation at 8 hours of aeration. This function shows promise for predicting browning
phenomenon in black olives, and represents an objective measurement of the relative degree of browning. Red colour evolution (λ = 700.0 nm) exhibited the greatest correlation in browning process. Natural red olives at pH 4.5 displayed optimal browning intensity. The reflection spectrum for blue colour
(λ = 435.8 nm) is suggested for objective measurement of the PPO polyphenoloxidase) enzyme activity. |
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