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• Composition Analysis •     Next Articles

Principal Component Analysis and Cluster Analysis of Free Amino Acid Composition of Different Species and Inner and Outer Lilium Scales

1, 1, 1, 1, 1,Yang SHAN1,Sheng-Hua DING1   

  • Received:2019-07-09 Revised:2020-04-20 Online:2020-06-25 Published:2020-06-22
  • Contact: Sheng-Hua DING E-mail:shhding@hotmail.com

Abstract: The free amino acids (FAAs) of the inner and outside scales of 7 species of lilium were determined by liquid chromatography-tandem mass spectrometry. The results showed that there were 21 kinds of FAAs in lily bulbs, and the total content ranged from 4.10 to 10.10 mg/g. Total free amino acids (TFAAs), essential amino acids (EAAs), flavoring amino acids, and medicinal amino acids were different among different cultivars. On the whole, the content of TFAAs in the inner scale was higher than that in the outer, with mean values of 7.00 mg/g and 6.18 mg/g, respectively. Among all species, the content of TFAAs was higher in lily of pinglu, lanzhou, and sichuan, and the lowest in lily of minjiang. The content of EAAs was high in lily of sichuan, and the scale content of both internal and external lily accounted for more than 10% of TFAAs. Bitter and umami amino acids were the main dominant amino acids in flavor amino acids, glutamic acid and arginine were the main contributors. The medicinal amino acids content was rich, all varieties account for 49.18%~70.15% of TFAAs. Five principal components were extracted through principal component analysis, and the cumulative variance contribution rate was 88.803%, which could reflect FAA comprehensive information. According to the comprehensive ranking, the top 3 were pinglu inner scale, sichuan inner scale and sichuan outer scale. Hierarchical cluster analysis divided the inner and outer scales of the seven species into five categories, and the results were consistent with the results of the principal component comprehensive analysis, which could reflect the differences between different lily germplasm.

Key words: Lily bulbs, free amino acid, liquid chromatography-tandem mass spectrometry, principal component analysis, cluster analysis

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