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Outline
In order to investigate the effects of combined treatment of ultra high pressure (UHP) and enzyme inhibitors on the activities of peroxidase (POD) and pectin methyl esterase (PME) in litchi pulp, two kinds of enzyme inhibitor prescriptions were designed including group A (citric acid 5 g/L+L-ascorbic acid 2.5 g/L+calcium chloride 5 g/L) and group B (citric acid 10 g/L+L-ascorbic acid 5 g/L+calcium chloride 10 g/L). After being immersed in enzyme inhibitor solutions for 10 min, the pulp of litchi (Litchi chinensis Sonn cv. Huaizhi) was subjected to UHP treatment (100~400 MPa for 30 min at 10 ℃). The activities of POD and PME were detected by spectrophotometry. Results showed that separate treatment of group A or group B could lead to obvious passivation of POD and prominent activation of PME. Combined treatment of UHP and group A could not make the activities of POD and PME decrease. The influence of combined treatment of UHP and group B on POD and PME had relevance to pressure value, the POD activity lowered when the combined treatment of 100~300 MPa and group B was applied, and the PME activity raised obviously when the combined treatment of 200~400 MPa and group B was applied. So, combined treatment of UHP and enzyme inhibitors had certain synergistic effect for POD inactivation, and the synergistic inhibition effect would be more obvious with higher concentration of enzyme inhibitors; but combined treatment of UHP and enzyme inhibitors showed certain rivalry for PME inactivation.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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