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| Effect of peeling on the compression characteristics of Cyperus esculentus |
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| KeyWord:Cyperus esculentus peeling compression characteristics breaking force breaking energy hardness |
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| Abstract: |
| In order to explore the internal mechanism of the influence of peeling on the compression characteristics of Cyperus esculentus, and provide data support for the formulation of oil production process conditions and the improvement of harvesting, transportation and processing machinery, the compression characteristics (breaking force, distance, breaking energy and hardness) of the peeled and unpeeled Cyperus esculentus under different moisture content, loading rates, loading positions and particle sizes, as well as the similarities and differences of the skin and kernel of Cyperus esculentus in main components and microstructure were investigated. The results showed that there were great differences in main components and microstructure of the kernel and skin of Cyperus esculentus. The contents of crude protein, crude fat, and starch in kernel were 1.8, 3.3 times and 17.9 times as high as that in skin, respectively. The kernel cells were honeycomb-like, while the skin cells were lamellar. As revealed by texture analyzer, compared with peeled samples, unpeeled samples also showed conspicuous yield point in addition to the ruptured point. The ranges of breaking force and hardness of peeled and unpeeled Cyperus esculentus were 93.94-197.62 N, 103.45-245.14 N and 23.45-43.70 N/mm , 24.27-53.02 N/mm, respectively. Additionally, the compression characteristic parameters of Cyperus esculentus were significantly affected by moisture content, loading rates, loading positions and particle sizes. Moreover, there was a positive relationship between loading rates, particle sizes of Cyperus esculentus and its breaking force and breaking energy. Peeled samples are more prone to compressing damage, the unpeeled bigger Cyperus esculentus with 15% moisture content is not easy to crack, and the compression in the y-axis direction at low rate is more likely to cause the compression damage. |
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