racemization

racemization

1. The rate of racemization of L-His was the most rapid in acetic acid, the suitable catalyst is salicylaldehyde.

L-组氨酸在乙酸溶剂中消旋最快，其合适的催化剂应是水杨醛；

2. Study on the Racemization of L-Tyrosine

L-酪氨酸的消旋研究

3. Keywords asymmetric transformation;racemization;configuration transformation;D-histidine;D-phenylglycine;

不对称转化;消旋;构型转化;D-组氨酸;D-苯甘氨酸;

4. To study the new method on the racemization process of dextromisole hydrochloride.Under the specific environments,water was used to replace dimethyl sulfoxide(DMSO) as the menstruum.

以水代替有机溶剂二甲基亚砜作为溶媒,在加热的碱性回流条件下对右旋咪唑游离碱的消旋化反应过程进行工艺改进,并找到了最佳的工艺参数。

5. Keywords tyrosine;racemization;acetic anhydride;carboxylic acid;

关键词酪氨酸;消旋;乙酸酐;羧酸;

6. The dependence of chain scission and racemization on temperature results from molecular motion, "cage effect" and steric hindrance during recombination.

分子量降低和消旋作用对温度的依赖性,是由于分子运动和笼罩效应以及重合的空间位阻效应所致。

7. chemical racemization

化学消旋

8. Keywords 5-substituted hydantoin;racemization;carbanion;translation;

单取代海因;消旋;碳负离子;转化;

9. Racemization is found with optically active substrate substrates

发现旋光基质有外消旋作用。

10. Keywords D-tetramisole;racemization;technological improvement;

右旋咪唑游离碱;消旋化;工艺改进;

11. Therefore, the auto racemization of L252 monosubstituted hydantoin is an important step of the production of L2 or D2N2 carbamoylase.

因此,52单取代海因的自发消旋成为L2或D2N2氨甲酰氨基酸生产中的一个重要的步骤。

12. solid racemization catalyst

固相外消旋化催化剂

13. Racemization is the conversion of an optically active form of a compound into a racemic mixture;

外消旋作用是把一种化合物的光学活性形式转化为外消旋的混合物；

14. racemization heat

外消旋热

15. Study on the racemization of L-Pro under different conditions including solvents, reaction temperature, catalyst, reaction time was precented.

对L-脯氨酸在不同溶剂、温度、催化剂、反应时间下的消旋作了研究。

16. Keywords p-Hydroxyphenylglycine;p-toluene sulfonic;Racemization;Resolution;Preferential crystallization;Asymmetric transformation;Enzymatic resolution;

对羟基苯甘氨酸;对甲苯磺酸;消旋;拆分;诱导结晶;不对称转换;酶促拆分;

17. Optimization of Microwave-Assisted Rapid Racemization of L-Alanine

微波辐射下L-丙氨酸消旋反应研究与优化

18. A new process was offered in studying the process of racemization of D-penicillamine and the prepare of L-penicillamine, which was different from the.

本课题着力于缩短原有生产外消旋体青霉胺和L-青霉胺的工艺，主要研究以D-青霉胺为原料，乙酰氯为酰化剂，酰化得到外消旋体乙酰-D、L-青霉胺，产率为74.6%。

19. Keywords configuration's transformation;racemization;resolution;L-proline;L-valine;D-proline;D-valine;

构型转换;消旋;拆分;L-脯氨酸;L-缬氨酸;D-脯氨酸;D-缬氨酸;

20. Study on Racemization of Amino Acids

氨基酸的消旋研究

21. Keywords hydantoinase;5-substituted hydantoin;racemization;bioconversion;

海因酶;5-单取代海因;消旋;生物转化;

22. Keywords Racemization;Chain-scission;Radiation effect;Poly（methyl methacrylate）;Molecular mobility;

消旋;裂解;辐射效应;聚甲基丙烯酸甲酯;分子活动性;

23. Keywords racemization kinetics;L-Proline;L-Histidine;carboxylic acid;aldehyde;

消旋动力学;L-组氨酸;L-脯氨酸;羧酸;醛;

24. Keywords racemization;D-tetramisole;separation;racemate;chiral drug;

消旋化;右旋咪唑游离碱;拆分;外消旋体;手性药物;

25. Keywords D-Tetramisole;racemization;technics improvement;

盐酸右旋咪唑;消旋化作用;工艺改进;

26. Technological improvement on the racemization of dextromisole hydrochloride

盐酸右旋咪唑消旋化工艺改进

27. As so far, there is just a little of literature of L252 monosubstituted hydantoin, and the details of the racemization of hydantoin are not revealed.

目前关于52单取代海因的消旋的文献非常少,海因消旋的细节问题也没有被完全揭示。

28. OBJECTIVE:To study the process of acetylized racemization of D-penicillamine in the acidic condition.

目的研究D-青霉胺在酸性条件下进行酰化外消旋的工艺。

29. A new heterogeneity racemization technology of valine in an ethanol solution of dibenzoyl-L-tartaric acid was described.

研究了缬氨酸在二苯甲酰L-酒石酸乙醇溶液中的非均相消旋新工艺,进行了消旋动力学研究,并与碱液消旋进行了比较。

30. Keywords R）-2-thione-thiazolidine-4-carboxylic methyl ester;racemization;L-systein methyl esterhydrochloride;

硫代四氢噻唑-4-羧酸甲酯;消旋化;L-半胱氨酸甲酯盐酸盐;

31. Keywords L-Histidine;D-Histidine;racemization;asymmetric transformation;

组氨酸;D-组氨酸;消旋;不对称转换;

32. Keywords D-histidine;asymmetric transformation;racemization;salicylaldehyde;

组氨酸;不对称转化;消旋;水杨醛;

33. Keywords valine;dibenzoyl-L-tartaric acid;racemization;

缬氨酸;二苯甲酰L-酒石酸;消旋;

34. Keywords L-valine;racemization;chemical resolution;D-valine;

缬氨酸;消旋化;化学拆分;D-缬氨酸;

35. New Racemization Technology of Valine

缬氨酸消旋新工艺

36. Keywords proline;racemization;salicylaldehyde;acetic acid;

脯氨酸;消旋;水杨醛;醋酸;

37. Racemization of Proline in Acetic Acid Solution

脯氨酸的消旋研究

38. Keywords D-Glutamic acid;L-Glutamic acid;racemization;resolution;amionacylase;

谷氨酸;L-谷氨酸;消旋;拆分;氨基酰化酶;

39. Keywords D-lysine;decarboxylase;racemization;biotransformation;

赖氨酸;脱羧酶;消旋;生物转化;

40. partial racemization

部分外消旋

41. Keywords （R;S）-ketoprofen;N-octyl-D-glucamine;resolution;racemization;

酮基布洛芬;N-辛基-D-葡糖胺;拆分;消旋化;

42. Keywords （S）- Ketoprofen;N-octyl D-glucamine;Resolution;Racemization;

酮基布洛芬;（-）-葡辛胺;半量拆分;消旋化.;

43. L-cysteine hydrochloride monohydrate was used as the first raw material,after racemization,precipitation and separation,and so on,D-cysteine hydrochloride monohydrate(AJI97) was obtained.

采用L-半胱氨酸盐酸盐为出发原料,经消旋、沉淀异构体、结晶分离、提纯的方法,制成达到日本味之素公司1997年公布的产品质量指标的D-半胱氨酸盐酸盐。

44. L-cysteine hydrochloride monohydrate was used as the first raw material, after racemization, precipitation and separation, and so on, D-cysteine hydrochloride monohydrate (AJI97) was obtained.

采用L-半胱氨酸盐酸盐为出发原料，经消旋、沉淀异构体、结晶分离、提纯的方法，制成达到日本味之素公司1997年公布的产品质量指标的D-半胱氨酸盐酸盐。

45. Keywords penicillamine;racemization;resolution;hydrolyze;

青霉胺;外消旋;拆分;水解;

46. Keywords D-penicillamine;Acetylization;Racemization;Kinetics;

青霉胺;酰化;外消旋;动力学;

47. Keywords unwanted enantiomers;configuration inversion;racemization;

非目标对映体;构型反转;外消旋化;

48. A Method for Determination of Amino Acid Enantiomers in Feed and Racemization of Protein Amino Acids

饲料中氨基酸异构体的测定方法及氨基酸异构化研究