排序方式: 共有18条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
通过在黄姜发酵过程中添加氯化钙,探究Ca~(2+)作为激活剂对黄姜皂素得率的影响。以黄姜皂素得率为考察指标,在单因素试验的基础上,利用正交试验对黄姜发酵条件进行优化。结果表明,最适发酵条件为:CaCl_2添加量0.3%、pH为5.5、发酵温度60℃、发酵时间48h。在此条件下黄姜皂素得率为0.825%,高于自然发酵的得率0.692%。 相似文献
7.
Yuanyuan JIANG 《等离子体科学和技术》2022,24(5):54003
A 2D axial symmetry fluid model is applied to study the features of an atmospheric-pressure argon (Ar) plasma jet propagating into ambient nitrogen (N2) driven by a pulsed voltage, emphasizing the influence of gas velocity on the dynamic characteristics of the jet. The results show that the Ar jet exhibits a cylindrical-shaped channel and the jet channel gradually shrinks with the increase in propagation length. The jet propagation velocity varies with time. Inside the dielectric tube, the plasma jet accelerates propagation and reaches its maximum value near the nozzle. Exiting the tube, its velocity quickly decreases and when approaching the metal plane, the decrease in jet velocity slows down. The increase in gas speed results in the variation of jet spatial distribution. The electron density presents a solid structure at lower gas flow speeds, whereas an annular structure can be observed under the higher gas flow velocity in the ionization head. The jet length increases with the flow velocity. However, when the flow velocity exceeds a critical value, the increase in the rate of the plasma jet length slows down. In addition, the gas velocity effect on the generation and transport of the reactive particles is also studied and discussed. 相似文献
8.
为研究水酶法提取牡丹籽油的工艺条件,以游离油提取率为指标,通过单因素试验和正交试验,确定了最佳提油预处理工艺条件,即料水质量比1︰6、p H 3.5、反应温度40℃、反应时间8 h;以游离油和水解蛋白提取率为指标,通过单因素试验,确定了最佳酶解条件,即在碱性蛋白酶最适条件下(pH 8.5,温度55℃),以3%(酶/籽,干基计)的添加量,酶解5 h。结果表明,游离油提取率可达86.21%,且乳化层较少。在上述最佳条件下,取250 g进行破乳研究,最终确定了冷冻解冻的破乳方法。结果表明,牡丹籽总清油提取率可达91.23%,所制备的牡丹籽油,色泽淡黄,气味清香。 相似文献
9.
10.
以棉籽粕为原料,采用碱提酸沉法提取棉籽蛋白,对酸沉得到的蛋白质用蒸馏水、乙醇、双氧水、亚硫酸氢钠进行洗涤以进一步去除棉酚,经过对比选择亚硫酸氢钠作为脱除剂,并对其脱除条件进行优化。得到亚硫酸氢钠脱除棉酚的最佳条件为添加量为0.3%、温度为40℃,搅拌时间为2h。在最佳条件下,棉酚脱除率达到了68.92%,蛋白质含量为85.47%。 相似文献