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| Effect of storage conditions on the quality of tiger nut and its oil |
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| KeyWord:tiger nut storage temperature storage humidity fatty acid composition vitamin E Fourier infrared spectroscopy |
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| Abstract: |
| To investigate the effect of different storage conditions on the quality of tiger nut and its oil,tiger nut was stored at different temperatures (15,35 ℃) and humidity (11%, 97%) for 40 d, the moisture content and oil content of tiger nut, and fatty acid composition, vitamin E content and Fourier infrared spectral characteristics of tiger nut oil were determined. The results showed that the moisture content of tiger nut under high humidity (97%) conditions increased significantly. The oil content of tiger nut stored under the low temperature and low humidity (15 ℃, 11%) condition was the highest at 28.73%， and the lowest was 26.82% under the high temperature and high humidity (35 ℃, 97%) condition. Storage conditions had no significant effect on the composition of fatty acid of tiger nut oil,but high temperature and low humidity storage conditions resulted in higher saturated fatty acid and polyunsaturated fatty acid contents and lower monounsaturated fatty acid content in tiger nut oil. The vitamin E content of tiger nut oil ranged from 171.34-183.80 mg/kg， with α-tocopherol (117.70-126.12 mg/kg) and β-tocopherol (40.55-45.38 mg/kg) as the main components. The high temperature and low humidity (35 ℃, 11%) storage condition contributed to the most severe loss of vitamin E. Within the scope of the experiment, the storage conditions had no significant effect on functional group and structure of tiger nut oil. In summary,the selection of appropriate storage conditions can facilitate the safe storage of tiger nut. |
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