Study on Natritional Composition Difference of the Protein,Amino Acids and Minerals Contents in Potato Varieties
To study the nutritional value of potatoes,the protein,amino acid and mineral contents in the wholemeal flour samples of 14 potato varieties were determined.The results showed that there were significant differences in the measured nutritional compositions between potato varieties under identical growth conditions.The mean value of total protein content was 9.81 g/100 g with a range between 7.89 g/100 g and 11.81 g/100 g.The analysis of variance results indicated that the protein content had no significant difference between the different flesh color groups.The mean value of total amino acid content was 75.70 mg/g with a variation range of 53.05-98.05 mg/g.The ratio of essential amino acid content to total amino acid content was 25.23%-46.20%.Among the correlations of individual amino acids,there was a significant positive correlation between all amino acids except for Tyr and GABA which were not significantly correlated with other amino acids.In terms of mineral contents,there was a significant positive correlation between Fe and Zn,while Ca had a significant positive correlation with Fe and Cu and a significant negative correlation with Mn,Ni and Se elements.The different nutritional quality of various potato varieties can help consumer and food manufacturers to choose good nutrition varieties for eating and for food processing,and can also provide breeder a theoretical basis for potato nutritional quality breeding.
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