共查询到17条相似文献,搜索用时 187 毫秒
1.
2.
二羟基丙酮的合成研究进展 总被引:1,自引:0,他引:1
二羟基丙酮是一种重要的生化原料、合成试剂,在精细化工、食品工业、化妆品工业等很多行业发挥着重要的作用。由于二羟基丙酮用途广泛,市场容量大,因此对二羟基丙酮的合成研究具有重要的意义。介绍了二羟基丙酮的主要合成方法及其应用研究的进展,并对其前景进行了展望。 相似文献
3.
4.
本文对微生物法生产二羟基丙酮的发展进行了简要的介绍。通过微生物法来生产二羟基丙酮相比于其他方法要更有优势,在二羟基丙酮的发酵与生产过程中最有价值的就是氧化葡萄糖酸杆菌。在发酵时,能够对二羟基丙酮的产量造成影响的有底物、产物、氧气以及菌体量等因素,而在多种发酵方式里,固定化发酵与反复流加工工艺的前途是最好的。而微生物法制备二羟基丙酮的具体发展方向就是对菌株的构建进行重组以及优化发酵工艺。 相似文献
5.
6.
1,3-二羟基丙酮作为重要的化工医药中间体,广泛应用于化工、医药、化妆品和食品领域。主要综述了1,3-二羟基丙酮的合成方法,包括化学合成法和微生物合成法,并介绍了其在化工与医药领域的最新应用进展。 相似文献
7.
对甘油选择性催化氧化转化为二羟基丙酮的研究进行综述,介绍了负载型催化剂在不同条件下对产物选择性和反应物转化率的影响,以及催化剂的作用机理。阐述了甘油催化氧化存在的问题以及发展前景。从均相到非均相催化,从单金属到双金属负载催化,从金属到非金属催化,甘油氧化反应的研究不断在完善。研究发现用Bi改性的Pt负载催化剂可以有效地将甘油选择性催化氧化为二羟基丙酮,在最优条件下,可获得较高的甘油转化率和二羟基丙酮选择性,但催化剂稳定性较差,有待进一步提高。杂多酸催化剂以及非金属催化剂也存在稳定性差的问题。指出改善催化剂的稳定性将是未来研究的主要方向。 相似文献
8.
甘油具有三个羟基官能团,赋予了它会进行多种反应。文章重点介绍了甘油酯化反应的催化剂,指出了其优缺点,并简单介绍了利用甘油制甘油缩醛、甘油碳酸酯、聚甘油、甘油酸和二羟基丙酮的催化剂的研究现状。 相似文献
9.
10.
11.
Male Sprague-Dawley rats were fed for 30 days a high-fat liquid ethanol diet with dihydroxyacetone, pyruvate and riboflavin
added as supplements (AMA-). Plasma triglyceride (TG) levels were 6-fold greater in these rats than in those fed and alcohol
with without the supplements (AA-). The liver TG content in rats fed the AMA-diet was similar to that of rats fed a control
diet (CA-) in which alcohol was replaced with isocaloric amounts of dextrose. Livers of rats fed the AA- diet had 3 times
more TG than controls. Alcohol ingestion also enhanced the hepatic content of cholesteryl esters (CE) and phospholipids (PL).
These lipids were reduced to levels found in livers of rats fed the control diet (CA-) when dihydroxyacetone, pyruvate and
riboflavin were included in the alcohol diet. The fatty acid compositions of TG, CE and PL from livers of rats fed the AMA-diet
were similar to those of corresponding lipids from rats fed the control diet (CA-) but differed from compositions when fed
the alcohol diet (AA-). Regardless of the diet fed, TG had the same fatty acid composition in plasma and liver. The same was
true of PL fatty acid composition. However, the fatty acid composition of CE differed between liver and plasma. The major
fatty acid in liver CE was 18∶1 whereas in plasma it was arachidonic acid (20∶4). Reduced fatty liver was observed in an earlier
study when rats were fed ad libitum an ethanol diet containing 20∶4. In the present study, we pair-fed the same diet and fatty
liver was not reduced. Dihydroxyacetone, pyruvate and riboflavin did not prevent alcohol-induced fatty liver when 20∶4 was
included in the AMA-diet. Our results confirm that dietary dihydroxyacetone, pyruvate and riboflavin prevent alcohol-induced
fatty liver, and show that this effect may result from increased mobilization of fat from liver. 相似文献
12.
Masakazu Sugiyama Zhangyong Hong LisaJ. Whalen WilliamA. Greenberg Chi‐Huey Wong 《Advanced Synthesis \u0026amp; Catalysis》2006,348(18):2555-2559
Dihydroxyacetone phosphate (DHAP)‐dependent aldolases have been widely used for the organic synthesis of unnatural sugars or derivatives. The practicality of using DHAP‐dependent aldolases is limited by their strict substrate specificity and the high cost and instability of DHAP. Here we report that the DHAP‐dependent aldolase L ‐rhamnulose 1‐phosphate aldolase (RhaD) accepts dihydroxyacetone (DHA) as a donor substrate in the presence of borate buffer, presumably by reversible in situ formation of DHA borate ester. The reaction appears to be irreversible, with the products thermodynamically trapped as borate complexes. We have applied this discovery to develop a practical one‐step synthesis of the non‐caloric sweetener L ‐fructose. L ‐Fructose was synthesized from racemic glyceraldehyde and DHA in the presence of RhaD and borate in 92 % yield on a gram scale. We also synthesized a series of L ‐iminocyclitols, which are potential glycosidase inhibitors, in only two steps. 相似文献
13.
高纯氧化镁作为一种重要的无机化工产品,在工业的各个领域得到了广泛的应用。对高纯氧化镁的应用做了简单的介绍;比较了国内外高纯氧化镁的研究状况。从长远发展看,高纯氧化镁的研究和生产前景广阔。 相似文献
14.
15.
16.
气相色谱技术的研究进展及其应用 总被引:3,自引:0,他引:3
气相色谱技术是现代仪器分析的重要研究领域之一,由于其独特、高效、快速的分离特性,已成为物理、化学分析不可缺少的重要工具。阐述了气相色谱系统的组成,介绍了全二维气棚色谱技术、快速气褶色谱技术、便携式色谱仪和气相色谱和质谱联用技术的研究进展及特点,探讨了气相色谱技术在石化分析、环境分析、生物药剂学研究分析及白酒分析中的应用。提出了气楣色谱技术的前景与展望,为气相色谱技术的发展提供有利价值。 相似文献