1
|
Xu H, Li X, Xin X, Mo L, Zou Y, Zhao G. Efficient Enzymatic Synthesis of Lipophilic Phenolic Glycoside Azelaic Acid Esters and Their Depigmenting Activity. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:13102-13112. [PMID: 34705451 DOI: 10.1021/acs.jafc.1c03092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this paper, an enzymatic route for synthesizing phenolic glycoside azelaic acid esters was successfully set up via lipase-catalyzed esterification and transesterification. Among the lipases tested, Candida antarctica lipase B (Novozyme 435) showed the highest activity in catalyzing esterification and Thermomyces lanuginosus (Lipozyme TLIM) gave the highest substrate conversion in catalyzing transesterification for the synthesis of ester. The addition of 4A molecular sieves into the reaction system is found to be an effective method for in situ absorption of the byproduct water and methanol, with which the substrate conversions of the enzymatic esterification and transesterification were 98.7 and 95.1%, respectively. Also, the main product ratios in transesterification were above 99.0% with lipozyme TLIM as a catalyst because the hydrolysis reaction was hindered. The results of the physical and biological properties indicate that all esters had higher Clog p values than their parent compounds. Also, the esters showed higher intracellular tyrosinase inhibitory and depigmentating activities than phenolic glycosides, azelaic acid (AA), and their physical mixtures due to their higher membrane penetration and tyrosinase inhibitory effects. In particular, piceid 6″-O-azelaic acid ester (PIA) showed the strongest inhibitory effect against melanin production. Its inhibitory rate was 77.4% at a concentration of 0.25 mM, about 4.2 times higher than that of arbutin (18.5%).
Collapse
Affiliation(s)
- Haixia Xu
- School of Food Science and Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510640, China
| | - Xiaofeng Li
- School of Food Science and Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510640, China
| | - Xuan Xin
- School of Food Science and Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510640, China
| | - Lan Mo
- School of Food Science and Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510640, China
| | - Yucong Zou
- School of Food Science and Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510640, China
| | - Guanglei Zhao
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510641, China
| |
Collapse
|
2
|
Olesti E, Boccard J, Visconti G, González-Ruiz V, Rudaz S. From a single steroid to the steroidome: Trends and analytical challenges. J Steroid Biochem Mol Biol 2021; 206:105797. [PMID: 33259940 DOI: 10.1016/j.jsbmb.2020.105797] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 11/02/2020] [Accepted: 11/24/2020] [Indexed: 12/23/2022]
Abstract
For several decades now, the analysis of steroids has been a key tool in the diagnosis and monitoring of numerous endocrine pathologies. Thus, the available methods used to analyze steroids in biological samples have dramatically evolved over time following the rapid pace of technology and scientific knowledge. This review aims to synthetize the advances in steroids' analysis, from classical approaches considering only a few steroids or a limited number of steroid ratios, up to the new steroid profiling strategies (steroidomics) monitoring large sets of steroids in biological matrices. In this context, the use of liquid chromatography coupled to mass spectrometry has emerged as the technique of choice for the simultaneous determination of a high number of steroids, including phase II metabolites, due to its sensitivity and robustness. However, the large dynamic range to be covered, the low natural abundance of some key steroids, the selectivity of the analytical methods, the extraction protocols, and the steroid ionization remain some of the current challenges in steroid analysis. This review provides an overview of the different analytical workflows available depending on the number of steroids under study. Special emphasis is given to sample treatment, acquisition strategy, data processing, steroid identification and quantification using LC-MS approaches. This work also outlines how the availability of steroid standards, the need for complementary analytical strategies and the improvement of calibration approaches are crucial for achieving complete steroidome quantification.
Collapse
Affiliation(s)
- Eulalia Olesti
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Switzerland; School of Pharmaceutical Sciences, University of Geneva, Switzerland; Swiss Centre for Applied Human Toxicology (SCAHT), Switzerland
| | - Julien Boccard
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Switzerland; School of Pharmaceutical Sciences, University of Geneva, Switzerland; Swiss Centre for Applied Human Toxicology (SCAHT), Switzerland
| | - Gioele Visconti
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Switzerland; School of Pharmaceutical Sciences, University of Geneva, Switzerland
| | - Víctor González-Ruiz
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Switzerland; School of Pharmaceutical Sciences, University of Geneva, Switzerland; Swiss Centre for Applied Human Toxicology (SCAHT), Switzerland
| | - Serge Rudaz
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Switzerland.
| |
Collapse
|
3
|
Mohamed LA, Kamal N, Elfakhri KH, Ibrahim S, Ashraf M, Zidan AS. Application of synthetic membranes in establishing bio-predictive IVPT for testosterone transdermal gel. Int J Pharm 2020; 586:119572. [PMID: 32599131 DOI: 10.1016/j.ijpharm.2020.119572] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 06/17/2020] [Accepted: 06/20/2020] [Indexed: 12/28/2022]
Abstract
The current study investigated the use of synthetic membranes in developing a bio-predictive in vitro permeation testing (IVPT) method for 1.62% testosterone gel. The IVPT studies were carried out using both Franz (FC), and Flow-through (FTC) diffusion cells. The experimental variables included the type of synthetic membranes (hydrophilic polyamide nylon, polysulfone tuffryn and STRAT-M (SM) membrane) and the type of receiver media (phosphate buffer containing various concentrations of sodium lauryl sulfate). In vivo drug release rates were obtained from published reports for 1.62% testosterone gel applied to either abdominal area (treatment group A), upper arms/shoulders (treatment group B), or alternating between abdomen and arms/shoulders (treatment group C). The in vitro-in vivo correlations were established using GastroPlus software. The best IVPT method was selected based on establishing point-to-point correlation with the in vivo data of treatment group A with minimal prediction errors (%PE) of AUC0-24 and Cmax. The results showed that the IVPT method which employed the FTC diffusion system, SM membrane and phosphate buffer without surfactant established the best IVIVR model with a correlation coefficient (R2) of 0.9966 and an exponential function of Y = (1.35)5 × X3.6. The in vivo data obtained from treatment group A and B was used for internal validation of the prediction model. The validation data was acceptable, with %PE of less than 10% for both AUC0-24 and Cmax. In conclusion, these results suggest that bio-predictive IVPT methods for testosterone gels may be developed using synthetic membranes and diffusion apparatus by varying the composition of the receiver medium.
Collapse
Affiliation(s)
- Loqman A Mohamed
- Division of Pharmaceutical Manufacturing II, Office of Pharmaceutical Manufacturing Assessment, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD 20993, USA
| | - Nahid Kamal
- Division of Product Quality Research, Office of Testing and Research, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD 20993, USA
| | - Khaled H Elfakhri
- Division of Product Quality Research, Office of Testing and Research, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD 20993, USA
| | - Sarah Ibrahim
- Division of Bioequivalence, Office of New Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD 20993, USA
| | - Muhammad Ashraf
- Division of Product Quality Research, Office of Testing and Research, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD 20993, USA
| | - Ahmed S Zidan
- Division of Product Quality Research, Office of Testing and Research, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD 20993, USA.
| |
Collapse
|
4
|
Dogra A, Kotwal P, Gour A, Bhatt S, Singh G, Mukherjee D, Nandi U. Description of Druglike Properties of Safranal and Its Chemistry behind Low Oral Exposure. ACS OMEGA 2020; 5:9885-9891. [PMID: 32391475 PMCID: PMC7203973 DOI: 10.1021/acsomega.0c00160] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 04/01/2020] [Indexed: 05/11/2023]
Abstract
Safranal, a plant secondary metabolite isolated from saffron, has been reported for several promising pharmacological properties toward the management of Alzheimer's disease. In the present study, we observe and report for the first time about several druglike attributes of safranal, such as adherence to Lipinski's rule of five; optimum lipophilicity; high permeability; low blood-to-plasma ratio; less to moderate propensity to interact with P-glycoprotein (P-gp) or breast cancer-resistant protein (BCRP) transporters; and high plasma protein binding as common to most of the marketed drugs using in vitro and ex vivo models. In spite of the above attributes, in vivo oral absorption was found to be very poor, which is linked to the structural integrity of safranal in simulated gastric fluid, simulated intestinal fluid, plasma, and liver microsomes. Moreover, the presence of unsaturated aldehyde moiety in safranal remains in equilibrium with its hydroxylated acetal form. Further research work is required to find out the stable oral absorbable form of safranal by derivatization of its aldehyde group without losing its potency.
Collapse
Affiliation(s)
- Ashish Dogra
- PK-PD,
Toxicology and Formulation Division, CSIR-Indian
Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
| | - Pankul Kotwal
- PK-PD,
Toxicology and Formulation Division, CSIR-Indian
Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
| | - Abhishek Gour
- PK-PD,
Toxicology and Formulation Division, CSIR-Indian
Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
| | - Shipra Bhatt
- PK-PD,
Toxicology and Formulation Division, CSIR-Indian
Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
| | - Gurdarshan Singh
- PK-PD,
Toxicology and Formulation Division, CSIR-Indian
Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
| | - Debaraj Mukherjee
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
- Natural
Product Chemistry Division, CSIR-Indian
Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
| | - Utpal Nandi
- PK-PD,
Toxicology and Formulation Division, CSIR-Indian
Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu, Jammu and Kashmir 180001, India
- ,
| |
Collapse
|
5
|
Kershaw JL, Hall AJ. Seasonal variation in harbour seal (Phoca vitulina) blubber cortisol - A novel indicator of physiological state? Sci Rep 2016; 6:21889. [PMID: 26906193 PMCID: PMC4764809 DOI: 10.1038/srep21889] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 02/03/2016] [Indexed: 01/07/2023] Open
Abstract
Cortisol is one of the main glucocorticoid hormones involved in both the mammalian stress response, and in fat metabolism and energy regulation, making it of increasing interest as a biomarker for stress, health and overall physiological state. However, transient stress responses to animal handling and sampling may be important sources of measurement artefact when investigating circulating concentrations of this hormone in wildlife. Here, cortisol concentrations were measured in the plasma and, for the first time, in the blubber of live captured adult harbour seals (Phoca vitulina). Plasma cortisol concentrations were positively correlated with capture time, suggesting that they were largely driven by a stress response to the capture event. In contrast, blubber cortisol concentrations were shown not to be significantly affected by capture time and varied significantly by sex and by season, with higher concentrations during natural fasting periods of their life cycle, particularly during the moult. These results suggest that cortisol may play a key role in increased fat metabolism during highly energetically demanding periods, and that blubber concentrations have the potential to be used as physiological state indicators in phocid seals.
Collapse
Affiliation(s)
- Joanna L Kershaw
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife. KY16 8LB, UK
| | - Ailsa J Hall
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife. KY16 8LB, UK
| |
Collapse
|
6
|
Pradhan DS, Solomon-Lane TK, Grober MS. Contextual modulation of social and endocrine correlates of fitness: insights from the life history of a sex changing fish. Front Neurosci 2015; 9:8. [PMID: 25691855 PMCID: PMC4315020 DOI: 10.3389/fnins.2015.00008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 01/09/2015] [Indexed: 12/18/2022] Open
Abstract
Steroid hormones are critical regulators of reproductive life history, and the steroid sensitive traits (morphology, behavior, physiology) associated with particular life history stages can have substantial fitness consequences for an organism. Hormones, behavior and fitness are reciprocally associated and can be used in an integrative fashion to understand how the environment impacts organismal function. To address the fitness component, we highlight the importance of using reliable proxies of reproductive success when studying proximate regulation of reproductive phenotypes. To understand the mechanisms by which the endocrine system regulates phenotype, we discuss the use of particular endocrine proxies and the need for appropriate functional interpretation of each. Lastly, in any experimental paradigm, the responses of animals vary based on the subtle differences in environmental and social context and this must also be considered. We explore these different levels of analyses by focusing on the fascinating life history transitions exhibited by the bi-directionally hermaphroditic fish, Lythrypnus dalli. Sex changing fish are excellent models for providing a deeper understanding of the fitness consequences associated with behavioral and endocrine variation. We close by proposing that local regulation of steroids is one potential mechanism that allows for the expression of novel phenotypes that can be characteristic of specific life history stages. A comparative species approach will facilitate progress in understanding the diversity of mechanisms underlying the contextual regulation of phenotypes and their associated fitness correlates.
Collapse
Affiliation(s)
| | | | - Matthew S Grober
- Department of Biology, Georgia State University Atlanta, GA, USA ; Neuroscience Institute, Georgia State University Atlanta, GA, USA
| |
Collapse
|
7
|
Tosti T, Natić M, Smoliński A, Milić D, Milojković-Opsenica D, Tešić Ž. Study of retention of 31 polyoxygenated steroids by normal- and reversed-phase thin-layer chromatography. ACTA CHROMATOGR 2011. [DOI: 10.1556/achrom.23.2011.3.5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
8
|
A comparative study concerning chromatographic retention and computed partition coefficients of some precursors of peraza crown ethers. OPEN CHEM 2010. [DOI: 10.2478/s11532-010-0095-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractRetention indices for some precursors of peraza crown ethers were determined by reversed phase high-performance thin layer chromatography on RP-18 plates with methanol-water in different volume proportions as mobile phase. The Log P values for the same compounds were calculated using different computer programs: SciQSAR, SciLogP, Chem3D Ultra 8.0, XLOGP (based on atom contributions), Chemaxon and KOWWIN (based on atom/fragment contributions), cLogP (based on fragmental contributions), ALOGPS and IAlogP (based on atom-type electrotopological-state indices and neural network modeling). A comparative study concerning lipophilic parameters (RM0, b and ϕ0) and computed partition coefficients has been developed. Taking into account the correlation coefficients between determined and calculated Log P values, it seems that RM0 and b are less suitable than ϕ0 for estimating lipophilicity of the compounds investigated, and cLogP and ALOGPS provide the best correlations with experimental values.
Collapse
|
9
|
Onişor C, Poša M, Kevrešan S, Kuhajda K, Sârbu C. Estimation of chromatographic lipophilicity of bile acids and their derivatives by reversed-phase thin layer chromatography. J Sep Sci 2010; 33:3110-8. [DOI: 10.1002/jssc.200900879] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
10
|
Parys W, Pyka A. INFLUENCE OF pH WATER ON THE LIPOPHILICITY OF NICOTINIC ACID AND ITS DERIVATIVES INVESTIGATED BY RP-TLC. J LIQ CHROMATOGR R T 2010. [DOI: 10.1080/10826076.2010.489015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Wioletta Parys
- a Department of Analytical Chemistry, Faculty of Pharmacy , Medical University of Silesia , Sosnowiec, Poland
| | - Alina Pyka
- a Department of Analytical Chemistry, Faculty of Pharmacy , Medical University of Silesia , Sosnowiec, Poland
| |
Collapse
|
11
|
Onişor C, Palage M, Sârbu C. Modeling of Chromatographic Lipophilicity Indices of Quaternary Ammonium and Nitrone Derivatives and Their Thiazolic Salts Using Molecular Descriptors. ANAL LETT 2010. [DOI: 10.1080/00032710903518575] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
12
|
Achrem-Achremowicz J, Kepczyńska E, Zylewski M, Janeczko Z. Synthesis of betulin derivatives and the determination of their relative lipophilicities using reversed-phase thin-layer chromatography. Biomed Chromatogr 2010; 24:261-7. [PMID: 19591243 DOI: 10.1002/bmc.1282] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A series of superlipophilic or highly lipophilic semisynthetic betulin derivatives was prepared and their relative lipophilicity was measured by reversed-phase thin-layer chromatography (RP-TLC) at different pH values using 1,4-dioxane-acetate buffer mixtures as mobile phases. Cholesterol, 17beta-estradiol and pure betulin were used as the reference compounds. Linear relationships were found between R(M) values and 1,4-dioxane concentrations in the mobile phases. LogP values were also calculated with computer programs ACD/LogP (ChemSketch 11.0, Advanced Chemistry Development Inc.) and ClogP (Daylight Chemical Information Systems Inc.). The empirical and theoretical data were compared, and the R(M0) values correlated well with logP. Two of the synthesized betulin derivatives are reported for the first time.
Collapse
Affiliation(s)
- Jacek Achrem-Achremowicz
- Department of Raw Materials and Fruit and Vegetable Processing, Agricultural University, Kraków, Poland.
| | | | | | | |
Collapse
|
13
|
Pyka A. Use of Selected Topological Indexes for Evaluation of Lipophilicity of Steroid Compounds Investigated by RP-HPTLC. J LIQ CHROMATOGR R T 2009. [DOI: 10.1080/10826070903320723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Alina Pyka
- a Department of Analytical Chemistry , Faculty of Pharmacy, Medical University of Silesia , Sosnowiec, Poland
| |
Collapse
|
14
|
Oros G, Cserháti T. Reversed Phase Thin Layer Chromatographic Behavior of Some Acylanilide Fungicides. J LIQ CHROMATOGR R T 2009. [DOI: 10.1080/10826070902854896] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Gy. Oros
- a Plant Protection Institute , Hungarian Academy of Sciences , Budapest, Hungary
| | - T. Cserháti
- b Research Institute of Materials and Environmental Chemistry , Chemical Research Center, Hungarian Academy of Sciences , Budapest, Hungary
| |
Collapse
|
15
|
Atrrog AAB, Natić M, Tosti T, Milojković-Opsenica D, Đorđević I, Tešević V, Jadranin M, Milosavljević S, Lazić M, Radulović S, Tešić Z. Lipophilicity of some guaianolides isolated from two endemic subspecies ofAmphoricarpos neumayeri(Asteraceae) from Montenegro. Biomed Chromatogr 2009; 23:250-6. [DOI: 10.1002/bmc.1091] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
16
|
Völgyi G, Deák K, Vámos J, Valkó K, Takács-Novák K. RPTLC determination of logPof structurally diverse neutral compounds. JPC-J PLANAR CHROMAT 2008. [DOI: 10.1556/jpc.21.2008.2.12] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
17
|
Djaković-Sekulić T, Perišić-Janjić N, Sârbu C, Lozanov-Crvenković Z. Partial least-squares study of the effects of organic modifier and physicochemical properties on the retention of some thiazoles. JPC-J PLANAR CHROMAT 2007. [DOI: 10.1556/jpc.2007.6001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
18
|
Pyka A, Babuska M, Dziadek A, Gurak D. Comparison of Spectrodensitograms of the Selected Drugs on Different Chromatographic Sorbents. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070701276713] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- A. Pyka
- a Department of Analytical Chemistry, Faculty of Pharmacy , Silesian Academy of Medicine , Sosnowiec, Poland
| | - M. Babuska
- a Department of Analytical Chemistry, Faculty of Pharmacy , Silesian Academy of Medicine , Sosnowiec, Poland
| | - A. Dziadek
- a Department of Analytical Chemistry, Faculty of Pharmacy , Silesian Academy of Medicine , Sosnowiec, Poland
| | - D. Gurak
- a Department of Analytical Chemistry, Faculty of Pharmacy , Silesian Academy of Medicine , Sosnowiec, Poland
| |
Collapse
|
19
|
Pyka A, Babuśka M, Śliwiok J. Use of liquid chromatography and theoretical computational methods to compare the lipophilicity of selected cortisone derivatives. JPC-J PLANAR CHROMAT 2006. [DOI: 10.1556/jpc.19.2006.6.5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|