Study on Determination and Correlation of Soluble Sugars and Organic Acids in Peer Juice from Different Cultivars

The contents of sugars and organic acids in pear juice from different cultivars were determined by reverse phase HPLC. The correlations among different sugars and organic acids were analyzed using SAS statistic software. The results showed that the main soluble sugars were fructose, glucose and sucrose. The contents of fructose and glucose were higer than other soluble sugars in peer juice. The contents of fructose, glucose and whole soluble sugars were steady in peer juice, and there were notable correlation between fructose and glucose, fructose and whole soluble sugar. The main organic acids in peer juice included malic acid, citric acid, succinic acid, shikimic acid, tartaric acid, quinic acid, lactic acid and fumaric acid. The content of malic acid as 1.14-3. 09 g/L was the highest in peer juice. Moreover, there were notable differences among the contents of organic acids in peer juices from different cultivars. There were definitely positive correlation between succinic acid and lactic acid,succinic acid and fumaric acid. The same situation existed between shikimic acid and citric acid, as well as quinic acid.