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| Analysis on the Nutritional Components ofDifferent Varieties of Longan Flowers |
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| DOI：10.16768/j.issn.1004-874X.2022.06.004 |
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| Abstract: |
| 【Objective】Exploring the nutritional components of longan flowers and comparing the nutritional
components of different varieties of longan flowers will provide basis for further processing and comprehensive utilization
of longan flowers.【Method】The contents of soluble protein, soluble sugar and vitamin C in female and male flowers of
21 different longan varieties were determined by coomassie brilliant blue staining, anthrone-sulfuric acid method and 2,
4-dinitrophenylhydrazine colorimetric method respectively. The nutritional components in female and male flowers of 21 different longan varieties were evaluated comprehensively by principal component analysis and classified by clustering
methodology.【Result】The contents of soluble protein, soluble sugar and vitamin C in male flowers were higher than those
in female flowers. The average values of the three nutrients in male flowers were 14.02 mg/g, 191.23 mg/g and 5.29 mg/g
respectively, while those in female flowers were 12.54 mg/g, 167.25 mg/g and 5.21 mg/g respectively. Among the 21 tested
varieties, Shixia, Hongke, Shuangmamu, Shuiyan, Conghuadageyuan, Jiluanyan and Honghe showed higher level in all three
nutrients. Three principal components were extracted, and their cumulative contribution rate reached 78.56%, reflecting the
comprehensive nutritional quality of 21 longan varieties. Different results were obtained by clustering with different nutritional
components and the 21 varieties could be divided into 3 categories when the threshold value was 5.【Conclusion】Longan
flowers have high soluble sugar content, mainly concentrated in 100-250 mg/g, while soluble protein and vitamin C content
mainly concentrated in 10-20 mg/g and 2-10 mg/g, respectively. Longan flowers are rich in nutritional components, which can
be used as functional food or raw materials for medicinal development. |
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