共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
5.
7.
8.
9.
10.
11.
Five norisoprenoids were isolated from the green marine alga Ulva lactuca. Two new compounds were assigned to (3R,5R,6R,7E)3,5,6-trihydroxy-7-megastigmen-9-one (1) and (3S,5R,6S,7E)3,5,6-trihydroxy-7-megastigmen-9-one (2). The structures and absolute configurations of the five compounds were determined by analyses of NMR, MS and circular dichroism (CD). 相似文献
12.
石莼的化学成分研究(Ⅱ) 总被引:3,自引:0,他引:3
目的研究绿藻石莼的化学成分。方法利用硅胶柱色谱、凝胶柱色谱、HPLC等方法进行分离纯化,并根据理化性质和波谱数据鉴定结构。结果从石莼中分离得到8个化合物,分别鉴定为3,6-二甲基-2,5-哌嗪二酮(1)、吡咯并哌嗪-2,5-二酮(2)、3-异丙基-6-甲基-2,5-哌嗪二酮(3)、邻苯二甲酸二丁酯(4)、邻苯二甲酸二(2-乙基-己基)酯(5)、单棕榈酸甘油酯(6)、苯丙氨酸(7)、亮氨酸(8)。结论所有化合物均从石莼中首次分离得到。 相似文献
13.
绿藻石莼多糖的提取工艺 总被引:6,自引:0,他引:6
用正交设计法对绿藻石莼多糖成分提取工艺进行研究。采用苯酚-硫酸法测定石莼提取液中石莼多糖含量。结果显示在pH4、温度100℃条件下提取的提取液中石莼多糖含量最高,达55.19%。溶液pH和提取温度是提取石莼多糖的关键影响因素,提取次数和时间长短的影响不大。 相似文献
14.
15.
16.
目的:研究石莼硫酸多糖的分离纯化条件并对其结构进行解析。方法:对石莼水溶性硫酸多糖的分离、纯化条件进行优化,用苯酚-硫酸法测定粗多糖中多糖的含量;高效凝胶色谱测定多糖分子量;红外光谱和碳谱分析多糖结构。结果:石莼硫酸多糖最佳提取条件为材料粉碎20目,用20倍量水85℃煎煮3次,每次2h。多糖含量为22.64%,分子量为1156112。所得可溶性多糖结构中主要含有β-葡糖醛酸和鼠李糖2种单糖,且多糖中含有大量的硫酸根。结论:本方法操作简便、结果稳定,可为工业生产提供理论依据。 相似文献
17.
Intissar Kammoun Imen Sellem Hajer Ben Saad Tahia Boudawara Moncef Nasri Neji Gharsallah Lotfi Mallouli Ibtissem Ben Amara 《Environmental toxicology》2019,34(11):1165-1176
The present study aimed to evaluate the potential protective and antioxidant effect of polysaccharides (PS) extracted from Ulva lactuca against thiacloprid (THC) induced nephrotoxicity and hepatotoxicity. The antioxidant capacity of PS was tested in vitro using ABTS radical scavenging activity and plasmid DNA cleavage assays andin vivo on adult male rats treated for 30 days. Animals were allocated into four groups: control; THC (22.5 mg/kg); THC (22.5 mg/kg) + PS1 (100 mg/kg diet); and THC (22.5 mg/kg) + PS2 (200 mg/kg diet). The structural features of PS were determined by Fourier transformed infrared (FT‐IR), UV absorption peak detection, high performance liquid chromatography (HPLC) and gel permeation chromatography, and also functional properties were investigated. Overall, results indicated that THC increased significantly malondialdehyde, advanced oxidation protein products, glutathione levels, which is correlated with severe histological and plasmatic biochemical injuries in both liver and kidney tissues. However, cotreatment PS induced a significant protective and healing affects against the nephrotoxicity and hepatotoxcity induced by THC. 相似文献
18.
19.