Comparison of Different Determination of Reducing Sugar in Potato

Reducing sugar content in potato is an important indicator of breeding,deep processing of high value-added.Reducing sugar content in potato tuber,not only affect their nutritional value,but also affect food flavor,processing technology and product quality.The reducing sugar in potato tuber was extracted by six different methods,and the reducing sugar analyzer and 3,5-dinitrosalicylic Acid(DNS) with spectrophotometry were used to analyze the content of reducing sugar.The results indicate that the accuracy of the fifth method which added ethanol when extracting reducing sugar was better than the other,and extending the preservation time of the extracted samples at the same time.Both analyzer and ordinary methods can determine reducing sugar in tuber.The reducing sugar analyzer,especially,can determine reducing sugar in tuber more convenient,rapidly and the recovery rate generally reached more than 99 %.So it is a better method to determine the reducing sugar content in potato tuber.