Comprehensive evaluation and analysis of nutrient contents of the main walnut varieties in Yunnan

doi:10.3969/j.issn.1000-2006.201802001

GENG Shuxiang, NING Delu, CHEN Haiyun, HE Na

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2019, Vol. 43 ›› Issue (02) : 209-215.

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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2019, Vol. 43 ›› Issue (02) : 209-215. DOI: 10.3969/j.issn.1000-2006.201802001

Comprehensive evaluation and analysis of nutrient contents of the main walnut varieties in Yunnan

GENG Shuxiang, NING Delu, CHEN Haiyun, HE Na

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Abstract

【Objective】 The functional components of the main walnut varieties in Yunnan were analyzed to provide a theoretical basis for deep processing of walnuts in Yunnan Province. 【Method】 Ten indexes of 32 walnut kernel samples from Yunnan Province were examined using a Soxhlet extractor, Kjeldahl nitrogen analyzer, atomic absorption spectrometer, and fluorescence detector, and principal components analysis was conducted on the functional components of the tested walnuts. 【Result】 The accumulated contribution rate of the top four components was 74.915%. The contribution rate of the first principal component was 22.562%; niacinamide was the highest positive feature vector value, whereas Zn and Fe were the highest negative feature vector values. The contribution rate of the second principal component was 14.192%; Ca and crude protein had the highest feature vector value. The contribution rate of the third principal component was 14.192%; crude protein had the highest positive feature vector value, whereas vitamin B₆ had the highest negative feature vector value. The contribution rate of the fourth principal component was 10.582%; melatonin had the highest positive feature vector values. These top four principal components basically explained the main information for 10 indexes of walnut kernels. 【Conclusion】 Based on the comprehensive evaluation, the ranking of nutrients of tested walnut varieties was ‘Yunxin 64’>‘Yangbi Yangpao’>‘Yunxin 4-3’>‘Ludian Dama 2’>‘Yunxin Yunling 34’>‘Yunxin 303’>‘Yunxin 36’>‘Huaning Dasake’>‘Huaning Dabaike’>‘Yunxin 306’>‘Ludian Dama 1’>‘Baoshan Xixiang’>‘Yunxin 301’>‘Yong 11’>‘Yunnan small round pineapple’>‘Yunxin plateau 14’>‘Yunnan big round pineapple’>‘Permanent bubble 1’>‘Three Dayao’>‘Yangbi Niang Qing’. Regarding the most popular variety ‘Yangpao’, the nutrient ranking of samples from different planting sites and elevations was ‘Diqing Yangpao’>‘Shuangjiang Yangpao’>‘Yangbi’(1 902 m)>‘Jingdong Yangpao’>‘Yangbi’(1 734 m)>‘Yangbi’(2 563 m)>‘Dali Yongping’>‘Lincang Yangpao’>‘Yangbi’(2 300 m)>‘Yangbi’(2 162 m).

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GENG Shuxiang, NING Delu, CHEN Haiyun, HE Na. Comprehensive evaluation and analysis of nutrient contents of the main walnut varieties in Yunnan[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2019, 43(02): 209-215 https://doi.org/10.3969/j.issn.1000-2006.201802001

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