Comparison of the Quality Characteristics of Hempseeds from Different Growing Regions
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Abstract:
In this study, hempseeds from six main growing regions of China were selected: Anhui Lu'an (ALHS), Guangxi Bama (GBHS), Gansu Tianshui (GTHS), Hebei Baoding (HBHS), Heilongjiang Suihua (HSHS), and Yunnan Dayao (YDHS). The appearance, physical indicators, basic nutrients, total phenolic contents and total flavonoid contents, as well as the antioxidant activities (as free radical scavenging capacity and ferric ion reducing power),of these hempseeds were investigated. The correlation between nutritional components and antioxidant activity was also analyzed. The research results showed that YDHS had the highest mass (7.29 g/ 100 grains) protein content (19.18 g/100 g), total sugars content (4.98 g/100 g) and total amino acid content (28.92 g/100 g). GBHS had the highest kernel yield (54.92%) and ALHS had the highest fat content (53.06%) GTHS had the highest ash content (4.86 g/100 g) and the lowest kernel yield (45.57%). The hempseeds from various regions contained large amounts of macro element P (1050.51~1260.09 mg/100 g) and trace element Fe (6.93~9.83 mg/100 g), with their total phenolic contents and total flavonoid contents in the range of 1.71~2.57 mg GAE/g and 0.41~2.92 mg QE/g, respectively (the highest contents of total phenolics and total flavonoids were with YDHS). The results of antioxidant tests showed that in terms of DPPH free radical scavenging ability and FRAP, YDHS had the highest values (1.92 μmol TE/g and 8.89 μmol FE/g, respectively) and GBHS had the lowest values (1.29 μmol TE/g and 4.69 μmol FE/g, respectively).Positive and significant correlations were found between total phenolic contents of hempseeds and their antioxidant activities (p<0.05). Base on the comprehensive analyses of the main components and antioxidant activities of hempseeds, the quality of YDHS was the best.
