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http://dx.doi.org/10.11626/KJEB.2018.36.4.620

Evaluation of the Discoloration of Pyropia yezoensis Ueda Using a Colorimeter  

Lee, Sang Yong (Seaweed Research Center, National Institute of Fisheries Science)
Kim, Young Hee (Seaweed Research Center, National Institute of Fisheries Science)
Lee, Jee Eun (Seaweed Research Center, National Institute of Fisheries Science)
Hwang, Eun Kyoung (Seaweed Research Center, National Institute of Fisheries Science)
Publication Information
Korean Journal of Environmental Biology / v.36, no.4, 2018 , pp. 620-625 More about this Journal
Abstract
Pyropia yezoensis is one of the most extensively cultivated seaweeds used as food in Korea. However, the quality and yield of Pyropia farms are frequently affected by outbreaks of thallus discoloration. The objective of this study was to develop a simple and rapid method to evaluate P. yezoensis discoloration caused by nutrient deficiencies. A colorimeter was used to quantify the color of P. yezoensis in nutrient deficient media over 10 days. Quantitative values of lightness (L), redness (a), and yellowness (b) measured with a colorimeter were used as indicators of P. yezoensis discoloration. The vacuoles of P. yezoensis were observed at 4 days and swelled gradually from 6 days onward. The three colorimeter parameters L, a, and b values showed significantly different values with culture period. The lightness (L) value was darker initially, and continued to lighten over culture period. The yellowness (b) value increased, but the redness (a) value decreased throughout this study. The a/b ratio and redness (a) values from the colorimeter were important P. yezoensis color change indicators. The discoloration group of P. yezoensis had quantitative values for parameters of L above 70, a below 2.6, and b above 15.0. The results of this study showed that quantitative colorimetric measurements can be used as tools for simple and rapid detection of P. yezoensis discoloration.
Keywords
discoloration; colorimeter; Pyropia yezoensis;
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