共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
4.
采用以水为萃取剂、酒精为沉淀剂的方法,从芋头中提取植物胶,研究了萃取温度、萃取时间、沉淀液的用量对植物胶产量的影响,并确定了芋头植物胶的最佳提取条件。 相似文献
5.
6.
以提取过药用成分的杜仲叶渣为原料,提取杜仲胶。研究了分别用碱水解和酶解预处理杜仲叶渣,然后用溶剂提取杜仲胶,以及直接用溶剂提取杜仲胶的工艺。实验结果表明最佳工艺条件为:杜仲叶渣直接用正己烷作溶剂提取杜仲胶,原料与溶剂比例为1:20(g:mL),机械搅拌并加热回流浸提2h,趁热过滤,滤液放入冰箱在-20℃条件下冷却析晶1h,真空抽滤后自然干燥得到浅绿色杜仲胶产物,提取得率为4.42%。用丙酮多次精制得到白色的杜仲胶。对白色杜仲胶产物做红外光谱测定,确定为反式1,4-聚异戊二烯(TPI)。 相似文献
7.
8.
9.
文章介绍了钾硝石提取硝酸钾过程中硫酸钾提取的工艺过程及工艺控制,并对该工艺存在的问题,提出了改进方法,供广大无机盐化工工作者参考和指正。 相似文献
11.
Chan Lu Jun Ye Yuanqing Chang Zeyuan Mi Shuai Liu Donghao Wang Zhezhi Wang Junfeng Niu 《International journal of molecular sciences》2022,23(17)
SWEETs (sugars will eventually be exported transporters), a well-known class of sugar transporters, are involved in plant growth and development, sugar transport, biotic and abiotic stresses, etc. However, to date, there have been few investigations of SWEETs in Orchidaceae. In this study, 23 SWEET genes were identified in Bletilla striata for the first time, with an MtN3/saliva conserved domain, and were divided into four subgroups by phylogenetic tree. The same subfamily members had similar gene structures and motifs. Multiple cis-elements related to sugar and environmental stresses were found in the promoter region. Further, 21 genes were localized on 11 chromosomes and 2 paralogous pairs were found via intraspecific collinearity analysis. Expression profiling results showed that BsSWEETs were tissue-specific. It also revealed that BsSWEET10 and BsSWEET18 were responsive to low temperature and oxidative stresses. In addition, subcellular localization study indicated that BsSWEET15 and BsSWEET16 were localized in the cell membrane. This study provided important clues for the in-depth elucidation of the sugar transport mechanism of BsSWEET genes and their functional roles in response to abiotic stresses. 相似文献
12.
13.
14.
15.
采用超临界CO2萃取技术分离腐竹中的脂类物质,以脱油率为考察指标,研究了萃取压力、萃取温度对萃取最终脱油率的影响,并确定了超临界CO2流体萃取腐竹中脂类物质最佳工艺条件:萃取压力35 MPa,萃取温度45℃,分离温度30℃,萃取时间1.5 h,此工艺条件下出油率为4.79%。 相似文献
16.
17.
用酸提取法从鲫鱼中提取胶原蛋白,用不同浓度的盐酸作为脱钙溶液,以0.5 mol/L乙酸—乙酸钠缓冲溶液提取其胶原蛋白。单因素分析与正交试验结果表明:提取温度为6~10℃时,最佳提取条件为固液比1∶20,提取时间每次1.5 h,脱钙酸浓度为0.5 mol/L,脱钙时间3 h,胶原蛋白提取率为0.773%。 相似文献
18.
19.
20.
胶体与界面化学是工科化学专业的一门重要专业基础课。文章从增加课程趣味性、激发学生学习兴趣、开拓学生视野、提高教学效率等4方面对胶体与界面化学课程教学进行了探讨,总结了胶体与界面化学教学的一些体会。 相似文献