stationary phases for tlc

... DEVELOPMENT OF NOVEL CHIRAL STATIONARY PHASES FOR HPLC BASED ON COVALENTLY BONDED POLYSACCHARIDE DERIVATIVES ZHANG SHENG (B.Sc., Peking University) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF ... early 1960s, the racemic form of thalidomide was mainly prescribed for morning sickness of pregnant women Unfortunately, approximately 10,000 children were born with malformations because of the ... important for drugs, but also for agrochemicals,14-16 environment,17-19 and food.20-23 For agrochemicals, a switch from racemic mixture to single enantiomeric agrochemicals has been suggested for environmental,...

Ngày tải lên: 14/09/2015, 08:40

... NOVEL CHIRAL STATIONARY PHASES (CSP) FOR ENANTIOSEPARATION PROCESSES CHEN LEI (MSc) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHYLOSORPHY DEPARTMENT ... background 1.2 Methods available for chiral discrimination 1.3 Chromatographic methods for chiral discrimination 1.3.1 Chiral stationary phases (CSPs) I II III IV V VI Type ... Electrophoresis CH3 CN Acetonitrile CSP Chiral stationary phase DMF Dimethyl formamide FT-IR Fourier Transform Infrared Spectroscopy GC Gas Chromatography HPLC High performance liquid chromatography IPA...

Ngày tải lên: 17/09/2015, 17:18

... complex formation cannot take place due to steric hindrance For example, toluene can form host-guest complex with α-CD and β-CD but is too small for γ-CD, whereas naphthalin is too big for α-CD ... phase and stationary phase Different transports through stationary phases from diffusion, convection, turbulence, etc., lead to the dispersion of solute zones around an average value Therefore, each ... details for different direct methods for enantioseparation in chromatography are shown in Table 1.3 14 Table 1.3 Direct methods for enantioseparation in chromatography Technique Selector Type GC Stationary...

Ngày tải lên: 09/09/2015, 08:12

... Electrophoresis CH3CN/ACN Acetonitrile CSP Chiral Stationary Phase DMF Dimethyl Formamide FTIR Fourier Transform Infrared Spectroscopy GC Gas Chromatography HPLC High Performance Liquid Chromatography HMDS ... thalidomide was found to be a dangerous drug for pregnant women, where the d-form is a safe sedative but the l-form causes severe birth defects and deformities (Figure 1.6) Arising from the increasing ... inconvenient for preparative applications because the chiral additive must be removed from the enantiomeric solutes 1.5.2.b Chiral Stationary Phases At present, there are over a hundred of CSPs for HPLC...

Ngày tải lên: 16/09/2015, 17:13

... were conditioned with mobile phase before use 152 Chapter Conclusions and Suggestions for Future Work 8.1 Conclusion Six novel β-CD bonded chiral stationary phases have been developed The CSPs ... were afforded by the 6-carbon spacer CSP ETHE-6PC for selected flavanones in Table 5.3 It appears that CSP ETHE-6PC displays greater enantioseparation abilities than the other two CSPs for most ... enantioselectivity for almost all the test racemic compounds under normal phase Therefore, it is within reason to say the 6-carbon chain spacer appears to be the optimal spacer length for a phenylcarbamate...

Ngày tải lên: 16/09/2015, 17:14

... Bonded Chiral Stationary Phases for Liquid Chromatography 1.3.1 Types of Chiral Stationary Phases for Liquid Chromatography 1.3.2 Preparation of β-Cyclodextrin Type of Chiral Stationary Phases 10 ... Chiral Stationary Phases for Liquid Chromatography There are a number of different materials prepared and employed as chiral stationary phases for liquid chromatography Basically, these chiral stationary ... CHIRAL STATIONARY PHASES FOR CAPILLARY ECLECTROCHROMATOGRAPHY 104 5.1 Introduction 104 5.2 Experimental 107 5.2.1 Reagents and Materials 107 5.2.2 Apparatus 107 5.2.3 Preparation of Bonded Stationary...

Ngày tải lên: 17/09/2015, 17:19

... extent of the acidic region responsible for cytochrome c docking While no direct structural information is at hand for the docked complex, the interaction domain for cytochrome c on the cytochrome ... of Km for mutants H119I/Q120I, D146N, E140Q and P196G measured at 56 mM Comparing these values with those measured at 36 mM, again we found increased Km values for these mutants and also for E142Q ... in Table Comparing Km and kcat each at optimum ionic strength for both forms, it is evident that kcat is lower by a factor of three for the twosubunit enzyme, while its Km is diminished twofold...

Ngày tải lên: 22/02/2014, 07:20

... Praise for TLC at Work TLC at Work brings the MBTI® tool to life Understanding how behavior patterns shape performance can help you, as a manager or a performer, begin to move ... Self-Responsibility TLC for All Types: Self-Responsibility 107 ix TLC at Work x Chaper 4: Communication Listens Carefully Shares Information Effectively Quick Tips for Developing Communication ... 164 TLC for All Types: Communication Chapter 5: Mindfulness Knows How to Learn Knows How to Apply Thinking 199 200 Quick Tips for Developing Mindfulness TLC for All Types:...

Ngày tải lên: 24/03/2014, 00:21

... not limited for FSBM, but valid for all kinds of FBMAs The proposed approach is a companion for all kinds of FBMAs in H.264/AVC Articles in [33–38] present the subsample approaches for motion ... the algorithm for H.264/AVC applications, the proposed algorithm can produce stationary quality at the PSNR of 0.36 dB for a given bitrate while saving about 69.6% power consumption for FSBM, and ... can be applied for all kinds of FBMAs and provide high degree of flexibility for adaptively adjusting the computational load Secondly, the subsample approach is feasible and scalable for either hardware...

Ngày tải lên: 21/06/2014, 08:20

... symmetric operator in H t for each t ∈ 0, T Statement 1.5 A t has a regular point for each t ∈ 0, T in R A t is symmetric and R A t λI H t , for some λ ∈ R; therefore, for each t ∈ 0, T , A t ... R0 λ → ∞ and det R1 λ → as λ → ∞ Thus, for sufficiently large λ, R λ is invertible and det R λ → ∞ Therefore, the system 3.32 has a unique solution Thus, for sufficiently positive large λ, the problem ... inner products ·, · Xν , which i generate uniform equivalent norms, that is, −1 c2 v v i Xν t v, v i Xν i Xν t , ≤ v i Xν t ≤ c2 v t ∈ 0, T , ν i For each v ∈ Xν , the function t → v i Xν t i,...

Ngày tải lên: 21/06/2014, 11:20

... ‘‘technical’’ (forced) ventilation can be applied for the technical design of the battery room ventilation Aspects that must be considered are given in Tables 6.12 and 6.13 At present, for stationary ... without expertise The survey shown in Figure 6.8 gives information about the correct sequence for jump-starting Figure 6.8 Information for the use of jump leads Copyright © 2003 by Expert Verlag ... standards can form trade barriers, which must be harmonized This work is done by CENELEC (European Committee for Electrotechnical Standardisation) Actually the safety standards for stationary batteries...

Ngày tải lên: 05/07/2014, 06:20

... most important applications for stationary lead-acid and nickel/cadmium batteries Equipment for emergency power supply of technical facilities and processes Today stationary batteries are mostly ... developed in the past; their reliability must be proved in the future STATIONARY BATTERIES Stationary batteries have been applied for more than 100 years During this time they have reached a technical ... application requirements for stationary batteries are quite different to a traction battery: A traction battery in general will be charged by a charger and then discharged, e.g by a forklift Thus the...

Ngày tải lên: 05/07/2014, 06:20

... not have to be non -stationary to be www.intechopen.com Metrology for non -stationary dynamic measurements 227 used for analysis of non -stationary measurements On the contrary, stationary signals ... issue for stationary calibration methods where a limited set of universal numbers is sufficient to describe the result www.intechopen.com Metrology for non -stationary dynamic measurements 223 Stationary ... service for dynamic non -stationary measurements needs to be built Dynamic Metrology – a framework for non -stationary dynamic analysis In the context of calibration, the analysis of non-stationary...

Ngày tải lên: 27/07/2014, 23:32

... cytokine genes, for example IL-2 and interferon-γ [21], as well as the expression of G1-kinases, a prerequisite for cell cycling In addition, the induction of IL-2 leads to autocrine support for the ... CD4+ T cells [25], but enhanced surface staining for CTLA-4 performed on naive T cells did not detect CTLA-4 protein [11] The surface CTLA-4 is therefore expressed at very low concentrations (fewer ... engagement [49], PP2A might serve as the mediator for these downstream effects of CTLA-4 However, so far only the opposite role for PP2A as a negative regulator for CTLA-4 function has been described [50]...

Ngày tải lên: 09/08/2014, 01:23

... request in σo For Chapter Object Management in Stationary Computing Environments Table 3.2: Window mechanism of DWM algorithm For (Each time unit) { If (There is a request Req for an object o) ... rearrange the server set S(o) to S (o) for improving the system performance However, since future request patterns are unpredictable, there is no sufficient information for us to decide which processor ... analysis [61] to evaluate the performance of DWM algorithm and ADRW algorithm Additionally, for ADRW algorithm, we carry out rigorous experiments to study the performance under several influencing...

Ngày tải lên: 16/09/2015, 17:11

... and the corresponding Weyl formula is acceptable only for the lowest fifty levels For these levels the resulting P(s) are shown in Fig 10͑c͒ and ͑d͒ As expected, P(s) for the classically chaotic ... function for the first sixteen stationary states are provided in Fig B Circle billiard Next, we consider a full-circle billiard of unit radius centered about the origin Analytical solutions for this ... of energies such that for the resulting sequence the mean level spacing is uniform, and equal to one, everywhere in the studied interval of the energy spectrum This transformation is achieved...

Ngày tải lên: 18/04/2016, 23:44

... support highspeed data for multimedia services has been the driving forces for developments in third generation, or 3G, infrastructures Perhaps a more subtle reason for the need for 3G is the growing ... may be different for different users within the cell and between cells It is used for transmitting the forward access channel (FACH) for access grant and the paging channel (PCH) for paging, both ... diversity, the BER performance improved as the chip rate increased For a chip rate of 0.96 Mcps, the BER performance was close to the computer simulated BER performance with L=1 The performance with...

Ngày tải lên: 04/08/2012, 14:24

Ngày tải lên: 06/08/2012, 15:04