排序方式: 共有9条查询结果,搜索用时 15 毫秒
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在苹果收获季节采摘时,仍有相当数量的未熟果、破裂果及虫蛀果混杂在成熟良好的苹果之中,这类苹果如不挑出,会影响整个苹果出售的品质及价格,而挑出次级果不加以利用则会降低果农的收益。未成熟的水果中含有大量的多酚类物质(类黄酮、甘宁等)简称苹果多酚,这些多酚类物质作为植物的二次代谢产物,在植物中广泛存在。一、苹果中多酚的组成未熟苹果与成熟苹果相比,虽然其成分组成相似,但成分含量上有很大差异,特别是多酚、有机酸、氨基酸、钙离子等未熟果含量明显高,其多酚物质的含量高出成熟量的10倍以上。多酚类物质中的主要成份… 相似文献
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白腐真菌生长条件及其代谢动力学模型(英文) 总被引:3,自引:0,他引:3
To investigate the growth conditions of white-rot fungus and simulate its metabolism kinetic models, the rules how the factors such as biomass, culture fluid, pH value, glucose consumption and exopolysaccharides generation, etc., changed during the batch culture process of white-rot fungi by using an air-lift fermenter, as well as metabolic kinetics of white-rot fungi were studied. Based on Logistic equation, Luedeking-Piret equation and experimental data, the correlation model parameters of mycelia biomass, glucose consumption and exopolysaccharide generation were obtained and found to be change with time in metabolism process. Detailedly, μm=0.071 8 h-1,α= 0.831 8 g/(g·h), β= 0.002 g/(g·h), b1=0.016 3 g/(g·h) and b2=3.023 3 g/(g·h). Hence the mycelial growth kinetic model, exopolysaccharide generation kinetic model and substrate consumption kinetic model which describe fermentation process of white-rot fungi were established. Meanwhile, the experimental data were verified by this model, and a good fitting result with an average relative error less than 10% between the data obtained from experiments and the model was yielded. The results show that these models can predict the growth and metabolic rules of white-rot fungus, the fermentation process of exopolysaccharides and the kinetic mechanism of white-rot fungus accurately. 相似文献
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