Comparative study of influence of reducing sugar content and polyphenol oxidase activity of raw sweet potato on the color of sweet potato granules
In order to compare and analyze the influence degree of reducing sugar content, PPO activity in raw sweet potato the color of sweet potato granules, the sugar content and PPO activity in 56 cultivars raw sweet potatoes and the L*, a*, b* value of granules made from 56 cultivars raw sweet potatoes were determined respectively. Based on the above data, the dispersion degree of reducing sugar content, PPO activity in raw sweet potato and L*, a*, b* value of sweet potato granules were analysed by quartile deviation, the correlation between reducing sugar content, PPO activity in raw sweet potato and the L*, a*, b* value of granules was analyzed by canonical correlation analysis. The results showed that dispersion degree of reducing sugar content and PPO activity in raw sweet potatoes were both high, and the PPOactivity had a greater impact on color of granules than reducing sugar content. In addition, It was found that the positive correlation between PPO activity in raw sweet potato and a* value of sweet potato granules, but the negative correlation between PPO activity in raw sweet potato and b* value of sweet potato granules.