Analytical Methods of Pyruvic Acid and Difference of Pyruvic Acid Content in Relation to Bulb Characteristics in Onion
2009
Lee, E.J., Kyungpook National University, Daegu, Republic of Korea | Suh, J.K., Kyungpook National University, Daegu, Republic of Korea
Six methods including Schwimmer and Weston (1961) method were compared for analysis of pyruvic acid. Among them, Yoo et al.'s (1995) method was the most efficient method but pyruvic acid contents were overestimated. Therefore based on those methods, we have designed a new analytical method to complement the existing methods. Although the newly designed method for this experiment took as much time as Yoo et al.'s (1995) method, it dramatically decreased the standard deviation between samples. Furthermore by this method the exactitude, uniformity and efficiency of trituration and extraction of sample were increased. The result of pyruvic acid in relation to the bulb characteristics showed that there were negative correlations between bulb weight, diameter and pyruvic acid content. On the other hand there were positive correlations between dry matter, the number of bulb scales and pyruvic acid content. Therefore when we considered the dry matter, the bulb diameter and the number of bulb scales as a functional formula, there were more correlation (r=0.72) with pyruvic acid content. With this functional formula, it can be concluded that pyruvic acid contents are predictable by investigating bulb characteristics.
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