排序方式: 共有4条查询结果,搜索用时 23 毫秒
1
1.
麦芽中的过氧化物酶(POD)具有活性高、热稳定强的特点,这为糖化阶段酶促氧化酚类物质的反应创造了条件.本文研究了大麦麦芽中POD活性对协定糖化麦汁品质的影响.结果表明:POD对麦汁的显著影响受限于H2O2的可得性,当H2O2的浓度为2 mmol.L-1时即可对麦汁酚类物质含量、抗氧化力、过滤速度和外观特性产生显著的不利影响.而在O2存在的情况下,高活性的POD同样可以氧化酚类物质,但对麦汁过滤速度和外观品质的影响不及H2O2显著.在实际糖化过程中由于底物H2O2和O2受限,使得POD酶促氧化多酚的反应未能充分表现. 相似文献
2.
全酶法制备大麦糖浆的最佳工艺为:高温α-淀粉酶加量8u/g大麦,液化时间10min;糖化温度60℃,pH60,糖化时间8h,β-淀粉酶加量100u/g大麦。由此工艺制备的大麦糖浆的DE值为72%,极限发酵度为74%。 相似文献
3.
利用DDC-Ⅱ型补偿式数字精密量热系统和专门设计的CCU-Ⅰ型量热单元,对啤酒生产中在控温下麦汁发酵过程进行了实验模拟,获得了过程的热谱图,并对葡萄糖液进行了相同的发酵过程的热监控。对比和分析了二者的热谱图,从量热的角度验证了文献中关于酵母对糖发酵的作用历程的认识。另外,对影响发酵的主要因素进行了试验研究,并在选定的通气速率条件下进行了相同的发酵试验,为改进啤酒生产工艺,提高啤酒质量和产量提供了实验依据 相似文献
4.
Christian Feißt Carlo Pergola Marija Rakonjac Antonietta Rossi Andreas Koeberle Gabriele Dodt Marika Hoffmann Christina Hoernig Lutz Fischer Dieter Steinhilber Lutz Franke Gisbert Schneider Olof Rådmark Lidia Sautebin Oliver Werz 《Cellular and molecular life sciences : CMLS》2009,66(16):2759-2771
We previously showed that, in vitro, hyperforin from St. John’s wort (Hypericum perforatum) inhibits 5-lipoxygenase (5-LO), the key enzyme in leukotriene biosynthesis. Here, we demonstrate that hyperforin possesses
a novel and unique molecular pharmacological profile as a 5-LO inhibitor with remarkable efficacy in vivo. Hyperforin (4 mg/kg, i.p.) significantly suppressed leukotriene B4 formation in pleural exudates of carrageenan-treated rats associated with potent anti-inflammatory effectiveness. Inhibition
of 5-LO by hyperforin, but not by the iron-ligand type 5-LO inhibitor BWA4C or the nonredox-type inhibitor ZM230487, was abolished
in the presence of phosphatidylcholine and strongly reduced by mutation (W13A-W75A-W102A) of the 5-LO C2-like domain. Moreover,
hyperforin impaired the interaction of 5-LO with coactosin-like protein and abrogated 5-LO nuclear membrane translocation
in ionomycin-stimulated neutrophils, processes that are typically mediated via the regulatory 5-LO C2-like domain. Together,
hyperforin is a novel type of 5-LO inhibitor apparently acting by interference with the C2-like domain, with high effectiveness
in vivo. 相似文献
1