Quality analysis of potato tuber and potato granules of main cultivars in Liaoning province

Abstract

11 varieties of potato tubers planted in Liaoning province were selected as raw materials, The mud-making process was used to produce the potato granules.The tuber quality indicators (total starch,protein, reducing sugar, fat, crude fiber and amino acids) and granule powder functional indicators (iodine blue value, light transmittance, freeze-thaw stability, water holding and oil holding) were determined in this research.The results showed that the starch content of 11 potato varieties ranged from 67.9% to 73.4%.Among them, Atlantic and 919 had higher starch content, Zaodabai and Kexin 23 had lower starch content.Protein content varied greatly, Fujin and Youjin protein content was higher, while zhongshu No.5 protein content was the lowest.The content of reducing sugar is also quite different.The content of BQ25 and Atlantic is lower, and the content of Kexin 23 is higher.There was no significant difference in fat content.For crude fiber, Atlantic crude fiber content is lower, Kexin 23 crude fiber content is higher.The contents of isobright amino acids, phenylpropionic amino acids and tyrosine in 11 varieties were all higher than those of WHO “essential amino acid model standard”.Compared with other amino acids, 33, Atlantic, Shepody and Zhongshu No.5 had more amino acids.There were no significant differences in free starch content among 11 varieties of potato granules.But the light transmittance was quite different.919 had the highest light transmittance, while BQ25 and the Atlantic had the lowest transmittance.The water evolution rates of Fujin,Kexin 23 and 33 were higher, while those of BQ25 and Atlantic were lower.The water-holding capacity and oil-holding capacity of the 11 varieties of potato granules were 7.3～8.1 g/mL and 7.6～8.6 g/mL respectively.The results can provide scientific basis for the development and application of potato tuber and potato granules in Liaoning Province.

Keywords

• potato tuber
• potato granules
• quality index
• function index