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| Studies on Relation between Phenol Content，Activities of PPO and POD，and Browning of Different Artichok Cultivars |
| GONG Hui-ling，LI Shan-jia，LI Zhi-zhong |
| College of Life Science and Technology，Lanzhou University of Technology，Lanzhou 730050，Gansu，China |
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Abstract The phenol content and activities of polyphenol oxidase（PPO）and peroxidease（POD），and browning degree in 5 artichok（Helianthus tuberosus L.）cultivars were tested．The result indicated that phenol content，activities of PPO and POD，and browning degree existed significant variation among the 5 artichok cultivars，and indexes of the 3 northern cultivars were higher than that of the 2 southern cultivars. The correlation analysis showed that the relation between PPO and browning degree is positively significant among the 4 cultivars，all of which had tumour of irregular shape．The correlation coefficient r=0.982. The result of browning principal component analysis showed that phenol content，activities of PPO and POD were 3 variables jointly affecting artichok browning.
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Received: 13 December 2010
Published: 27 March 2011
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