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Objective To investigate the effects of light and air on the storage quality and volatile flavor compounds of rice bran. Methods Fresh and high temperature and pressure steam stabilized rice bran were used as raw materials to investigate the effects of light and air on the changes of acid value, peroxide value, γ-oryzanol content, chromaticity and other physicochemical indexes as well as volatile flavor compounds during storage. Results During the storage process, light and air exerted insignificant influences on the acid value and γ-oryzanol content of stabilized rice bran, and had limited effects on the chromaticity indices L*, a* and b* values. However, they had a significant impact on the peroxide value. For the stabilized rice bran, the peroxide value could increase by up to 25 times in the presence of light and air. As the storage time extended, the types of volatile flavor substances in rice bran samples kept increasing. The treatments of avoiding light and vacuum could effectively prevent the generation of oxidation products such as aldehydes, ketones, and alcohols. In the presence of light and air, the concentrations of aldehydes and ketones in the stabilized rice bran increased by 6 times and 26 times. Conclusion The acid value of rice bran stabilized using high temperature and high pressure steam exhibits minimal changes when exposed to light and air during storage. However, the peroxide value and its oxidation products increases substantially, this indicates that avoiding light and vacuum treatment is the key to extending the shelf life of stabilized rice bran, providing a theoretical basis for its storage and industrial application.
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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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