(R)-Enantiomer
Development of normal phase chiral liquid chromatographic method for estimation of escitalopram oxalate and determination of R citalopram enantiomer from escitalopram oxalate in bulk drug and tablet
... In the present research work, a simple, sensitive and accurate normal phase HPLC method to separate R-enantiomer of escitalopram oxalate in bulk drugs and tablets using polysaccharide-based (chiralcel OD) column ...
6
Isolation and Characterization of R Enantiomer in Ezetimibe
... Isolation by Supercritical Fluid Chromatography (SFC) Racemic mixture solution of Ezetimibe and (R)-enanti- omer (10e solution of prepared in ethanol was used in the method development. To develop a rugged and suitable ...
8
Single Enantiomer of YK-4-279 Demonstrates Specificity in Targeting the Oncogene EWS-FLI1
... EWS-FLI1 has been shown to increase Cyclin D1 levels by altering the D1b/D1a mRNA level in ESFT cells through effects on transcript elongation [20]. Since racemic YK-4-279 significantly decreases Cyclin D1 levels in TC32 ...
11
Simultaneous Determination of Montelukast Sodium S-Enantiomer and A5 Enantiomers in Montelukast Sodium Bulk Drug by Normal-Phase Chiral HPLC
... The results displayed that both montelukast sodium enantiomers and A5 enantiomers can be well separated with resolution of 2.6 for montelukast sodium enantiomers and 6.7 for A5 R-enantiomers using (a) system while it was ...
10
Antifungal Activity and Association Study of (R) (+) citronellal Enantiomer with Amphotericin B, Fluconazole, Itraconazole and Miconazole against C tropicalis Isolated from Vulvovaginal Secretions
... The following substances used in this work were obtained commercially: enantiomer (R)-(+)-CT [(3R)-3.7-dimethyloct- 6-enal], (Purity > 90%), dimethylsulfoxide (DMSO) and Twee 80 (0.02%) (all from Sigma-Aldrich, ...
6
Single enantiomer synthesis of alpha (trifluoromethyl) beta lactam
... commercially available source of the CF 3 group. It was envis- aged that conjugate addition of an enantiomerically pure amide such as (R)- or (S)-3 would generate the addition adducts, carboxylate salts 4, as a mixture ...
8
(R) (–) Mepivacaine hydrochloride enantiomer: a low temperature study
... As part of a study of solid-state structural relationships between mepivacaine and its solvates (Giannellini et al., 2005), the structure of the (R)-() enantiomer of mepivacaine hydrochloride, (I), has been ...
7
Development and Validation of Chiral HPLC Method for Identification and Quantification of (R) Enantiomer in Ezetimibe
... phase was used during the study period. from the method development and optimization activities, Chiralpak AS-H (250 × 4.6 mm, 5 µm) column with mo- bile phase of n-hexane, ethanol, 2-propanol and trifluo- roacetic acid ...
6
A NOVEL ENANTIO SELECTIVE REVERSE PHASE HPLC METHOD FOR THE DETERMINATION OF EZETIMIBE AND IT’S ENANTIOMER
... The capability of the method to remain unaffected by small deliberate variations in the method parameters was studied in order to anticipate the problems that may arise during the regular application of the developed ...
15
Method Development and Validation for Enantiomer in Sitagliptin Hydrochloride by RPHPLC
... Reversed phase chiral HPLC method for separation enantiomers of sitagliptin was developed and validated. These sitagliptin isomer were resolved on a chiralpak IC (250 mm × 4.6 mm, 5 µm) column by using liquid mobile ...
5
DEVELOPMENT AND VALIDATION OF A LIQUID CHROMATOGRAPHIC ENANTIOMER SEPARATION METHOD FOR THE ESTIMATION OF (S) ENANTIOMER IN SITAGLIPTIN
... carried out for sitagliptin and its (S)-enantiomer on ten diverse chiral stationary phases. Chiral stationary phases, which were tested include, R, R Whelk-O1 column, macrocyclic glycopeptides namely, Chirobiotic ...
5
DEVELOPMENT AND VALIDATION OF CHIRAL HPLC METHOD FOR QUANTITATION OF ENANTIOMER IN ROSUVASTATIN CALCIUM
... each enantiomer and lactone impurity from Rosuvastatin, different stationary phases and mobile phases were ...the enantiomer of Rosuvastatin and Rosuvastatin peak was less than ...the enantiomer and ...
7
Isolation and Characterization of S Enantiomer in Montelukast
... limitations are based on system and column used. Here, the direct enatioseparation of the undesired en- antiomer from an active pharmaceutical ingredient, Montelukast, is isolated by Supercritical fluid chroma- tography ...
6
Preparation and properties of a coniferin enantiomer
... (1L)”), which consists of l-glucose and coniferyl alco- hol as shown in Fig. 1, because there is an enantiomer of d-glucose (l-glucose). To the best of our knowledge, compound 1L was not found in nature. It is ...
6
A comparison of medetomidine and its active enantiomer dexmedetomidine when administered with ketamine in mice
... Our study failed to demonstrate clinical advantages of the active enantiomer dexmedetomidine over the racemic mixture medetomidine when combined with ketamine for general anaesthesia in mice. These results ...
9
Cerebrospinal fluid in tuberculous meningitis exhibits only the L enantiomer of lactic acid
... In the present investigation, we used the CSF samples collected in our previous study and employed a derivati- zation method adapted from Scheijen et al. [5] to differ- entiate the enantiomers of lactic acid present. We ...
6
Resolution of Alcohol Racemate by Oil
... In this paper we report on our study about the kinetic resolution of several secondary alcohol racemates with im- mobilized C. antarctica lipase B (CAL-B) in vegetable oil (Figure 1). The oil was used not only as ...
5
Optimization of Chiral Separation of Nadolol by Simulated Moving Bed Technology
... one enantiomeric form of thalidomide was sleep inducing and anti-nausea (the R-Isomer), the other (S-Isomer) was later discovered to be teratogenic (i.e. can cause malformations of an embryo or fetus). The two ...
124
Structure and mechanism of acetolactate decarboxylase
... (R) enantiomer, the observation of binding by (S,S)-7 and (S,R)-7 suggest that the R-substrate can bind as shown in Fig- ure 4B, with additional interactions preventing decarboxyla- tion but promoting carboxylate ...
11
Effect of additives on the preferential crystallization of L-asparagine monohydrate
... preferred enantiomer and 50% is the counter ...counter enantiomer has no beneficial effect but does increase the drug loading on the ...counter enantiomer is harmful; R-thalidomide was used as a ...
17