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Schneider S, Hammann S, Hayen H. Determination of Polar Lipids in Wheat and Oat by a Complementary Approach of Hydrophilic Interaction Liquid Chromatography and Reversed-Phase High-Performance Liquid Chromatography Hyphenated with High-Resolution Mass Spectrometry. J Agric Food Chem 2023. [PMID: 37433133 DOI: 10.1021/acs.jafc.3c02073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
Cereals contain lipids that fulfill important physiological roles and are associated with stress in the plant. However, many of the specific biological roles of lipids are yet unknown. Comprehensive analysis of these polar lipid categories in whole grain wheat and oat, cereals highly relevant also in nutrition, was performed. Hydrophilic interaction liquid chromatography (HILIC) and reversed-phase high-performance liquid chromatography (RP-HPLC) coupled with high-resolution mass spectrometry using electrospray ionization in both positive and negative ionization mode was used. Exploiting the different separation mechanisms, HILIC was used as a screening method for straightforward lipid class assignment and enabled differentiation of isomeric lipid classes, like phosphatidylethanolamine and lyso-N-acylphosphatidylethanolamine, while RP-HPLC facilitated separation of constitutional isomers. In combination with data-dependent MS/MS experiments, 67 lipid species belonging to nine polar lipid classes could be identified. Furthermore, with both ionization modes, fatty acyl chains directly connected to the lipid headgroups could be assigned. This work focused on the four lipid classes N-acylphosphatidylethanolamines, acyl-monogalactosyldiacylglycerols, digalactosyldiacylglycerols, and monogalactosyldiacylglycerols as they were less studied in detail in the past. Applying the complementary approach, the relative lipid species compositions in these lipid classes was investigated in detail.
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Affiliation(s)
- Svenja Schneider
- Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstraße 48, 48149 Münster, Germany
| | - Simon Hammann
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Heiko Hayen
- Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstraße 48, 48149 Münster, Germany
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2
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Pan P, Svirskis D, Waterhouse GIN, Wu Z. A simple and reliable isocratic high performance chromatographic assay for the simultaneous determination of hydrophilic benzophenone-4 and lipophilic octocrylene in sunscreens. Int J Cosmet Sci 2023. [PMID: 37038989 DOI: 10.1111/ics.12860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 03/27/2023] [Accepted: 03/27/2023] [Indexed: 04/12/2023]
Abstract
OBJECTIVE This work aimed to develop a simple HPLC method for the simultaneous quantitative determination of the ultraviolet (UV) filters, hydrophilic benzophenone-4 and lipophilic octocrylene, in the presence of three other commonly used UV filters, avobenzone, octisalate, and homosalate. METHODS Reverse-phased HPLC was performed on a C18 column. A scouting gradient was initially used to determine the approximate mobile phase composition required for efficient analyte elution and separation before further optimization. The assay was validated with regards to specificity, linearity, intra- and inter-day accuracy and precision, limits of detection and limits of quantification. An ultrasound dispersion extraction method for the UV filters from a commercial sunscreen, was developed and the extraction efficiencies from spiked samples were calculated. RESULTS An acetonitrile-methanol-water mixture (20:67:13, v/v/v), where the water component contained 0.2% trifluoroacetic acid (v/v) was found to be the optimal mobile phase at a flow rate of 1.0 mL/min. The assay was linear between 1.0 - 100 μg/mL for both benzophenone-4 and octocrylene (both correlation coefficients were above 0.999). There was no interference from the excipients of the sunscreen nor from the three other UV filters. The intra- and inter-day accuracy was between 90.0 - 104.6% for both analytes. Extraction recoveries from a spiked commercial sunscreen was between 95.4 ± 2.1% to 98.5 ± 2.1% for benzophenone-4, and between 87.3 ± 2.3% and 98.9 ± 3.1% for octocrylene. All validation parameters were within the acceptance criteria set out in the International Council for Harmonization (ICH) guidelines. The HPLC assay showed the extracted quantities of benzophenone-4 and octocrylene from the commercial sunscreen closely matched claimed quantities. CONCLUSION The developed isocratic HPLC method was suitable for simultaneously determining the hydrophilic benzophenone-4 and lipophilic octocrylene in the presence of other commonly used UV filters. Additionally, the extraction method was simple and effective for accurately quantifying the UV filters in a commercial sunscreen.
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Affiliation(s)
- Patrick Pan
- School of Pharmacy, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Darren Svirskis
- School of Pharmacy, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - Geoffrey I N Waterhouse
- School of Chemical Sciences, Faculty of Science, The University of Auckland, Auckland, New Zealand
| | - Zimei Wu
- School of Pharmacy, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
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3
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Vijaykumar C, Kumar YR, Aparna P, Rao PSP. Development and validation of a stability-indicating, single HPLC method for sacubitril-valsartan and their stereoisomers and identification of forced degradation products using LC-MS/MS. Biomed Chromatogr 2023; 37:e5550. [PMID: 36410774 DOI: 10.1002/bmc.5550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 11/01/2022] [Accepted: 11/18/2022] [Indexed: 11/23/2022]
Abstract
The aim of this research work was to develop and validate a stability-indicating, single reversed-phase HPLC method for the separation of five impurities, including enantiomers, diastereomers, and degradation products in sacubitril-valsartan tablets. The method was developed using a Chiralcel OJ-RH column (150 × 4.6 mm, 5 μm) at 45°C with a gradient program of (T/%B) 0.01/25, 10.0/25, 25/38, 37.0/45, 39.0/25, and 45.0/25 at a flow rate of 0.8 ml/min. Mobile phase A consisted of 1 ml of trifluoroacetic acid in 1000 ml of Milli-Q water. Mobile phase B consisted of 1 ml of trifluoroacetic acid in a mixture of acetonitrile and methanol in the ratio of 950:50 (v/v). Sacubitril, valsartan, and their five impurities were monitored at 254 nm. Degradation was not observed when sacubitril-valsartan was subjected to heat, light, hydrolytic, and oxidation conditions. In acid degradation study (1 N HCl/60°C/2 h) impurity 1 (m/z 383.44) was formed, and in base degradation study (0.1 N NaOH/40°C/1 h) impurities 1 and 5 (m/z 265.35) were formed; both impurities were confirmed using LC-MS. The degradation products, enantiomers, and diastereomers were well separated from sacubitril and valsartan, proving the stability-indicating power of the method. The developed method was validated per the International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use guidelines. The inter- and intra-day percentage relative standard deviation for sacubitril, valsartan, and their five impurities was less than 5.2%, recovery of the five impurities was between 93 and 105%, and linearity was ≥0.999. The limit of detection was 0.030-0.048 μg/ml, and the limit of quantification was 0.100-0.160 μg/ml.
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Affiliation(s)
- Cholleti Vijaykumar
- Dr. Reddy's Laboratories Ltd, Active Pharmaceutical Ingredients, IPDO, Hyderabad, India.,Department of Chemistry, J.N.T. University, Hyderabad, India
| | | | - Pasula Aparna
- Department of Chemistry, J.N.T. University, Hyderabad, India
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Rak AY, Protasov EA, Trofimov AV, Pigareva NV, Ischenko AM. A novel method for purification of biologically active C-terminal fragment of human recombinant anti-mullerian hormone. Biomed Chromatogr 2021; 36:e5259. [PMID: 34622972 DOI: 10.1002/bmc.5259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 07/19/2021] [Accepted: 09/30/2021] [Indexed: 11/10/2022]
Abstract
Anti-mullerian hormone (AMH) is one of the least studied members of transforming growth factor beta superfamily showing pro-apoptotic activity against cells positive for hormone type II receptor overexpressed by malignant cells in many cancer cases. Here, we propose an improved method for isolation of recombinant C-terminal AMH fragment (C-rAMH) to obtain homogeneous preparations of this protein with high biological activity. In contrast to our previously developed C-rAMH purification technology based on reversed-phase HPLC, the key stage of the new approach is hydrophobic interaction chromatography using Toyopearl Butyl-650S resin performed under more benign conditions. This modification of the previously developed method allowed highly purified C-rAMH to be obtained that is characterized by twice the specificity estimated as the ability to bind to the recombinant analog of AMH type II receptor and by significantly higher biological activity, that is, the ability to induce the death of target cells. Thus, we made the purification technology even more cost-effective and suitable for the production of drug forms based on C-rAMH.
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Affiliation(s)
- Alexandra Ya Rak
- State Research Institute of Highly Pure Biopreparations, St Petersburg, Russian Federation
| | - Evgeny A Protasov
- State Research Institute of Highly Pure Biopreparations, St Petersburg, Russian Federation
| | - Alexander V Trofimov
- State Research Institute of Highly Pure Biopreparations, St Petersburg, Russian Federation
| | - Natalia V Pigareva
- State Research Institute of Highly Pure Biopreparations, St Petersburg, Russian Federation
| | - Alexander M Ischenko
- State Research Institute of Highly Pure Biopreparations, St Petersburg, Russian Federation
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Castelvetro V, Corti A, La Nasa J, Modugno F, Ceccarini A, Giannarelli S, Vinciguerra V, Bertoldo M. Polymer Identification and Specific Analysis (PISA) of Microplastic Total Mass in Sediments of the Protected Marine Area of the Meloria Shoals. Polymers (Basel) 2021; 13:796. [PMID: 33807658 PMCID: PMC7961433 DOI: 10.3390/polym13050796] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 03/01/2021] [Accepted: 03/02/2021] [Indexed: 02/01/2023] Open
Abstract
Microplastics (MPs) quantification in benthic marine sediments is typically performed by time-consuming and moderately accurate mechanical separation and microscopy detection. In this paper, we describe the results of our innovative Polymer Identification and Specific Analysis (PISA) of microplastic total mass, previously tested on either less complex sandy beach sediment or less demanding (because of the high MPs content) wastewater treatment plant sludges, applied to the analysis of benthic sediments from a sublittoral area north-west of Leghorn (Tuscany, Italy). Samples were collected from two shallow sites characterized by coarse debris in a mixed seabed of Posidonia oceanica, and by a very fine silty-organogenic sediment, respectively. After sieving at <2 mm the sediment was sequentially extracted with selective organic solvents and the two polymer classes polystyrene (PS) and polyolefins (PE and PP) were quantified by pyrolysis-gas chromatography-mass spectrometry (Pyr-GC/MS). A contamination in the 8-65 ppm range by PS could be accurately detected. Acid hydrolysis on the extracted residue to achieve total depolymerization of all natural and synthetic polyamides, tagging of all aminated species in the hydrolysate with a fluorophore, and reversed-phase high performance liquid chromatography (HPLC) (RP-HPLC) analysis, allowed the quantification within the 137-1523 ppm range of the individual mass of contaminating nylon 6 and nylon 6,6, based on the detected amounts of the respective monomeric amines 6-aminohexanoic acid (AHA) and hexamethylenediamine (HMDA). Finally, alkaline hydrolysis of the residue from acid hydrolysis followed by RP-HPLC analysis of the purified hydrolysate showed contamination by polyethylene terephthalate (PET) in the 12.1-2.7 ppm range, based on the content of its comonomer, terephthalic acid.
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Affiliation(s)
- Valter Castelvetro
- Department of Chemistry and Industrial Chemistry, University of Pisa, 56124 Pisa, Italy; (A.C.); (J.L.N.); (F.M.); (A.C.); (S.G.); (V.V.)
- CISUP—Center for the Integration of Scientific Instruments of the University of Pisa, University of Pisa, 56124 Pisa, Italy
| | - Andrea Corti
- Department of Chemistry and Industrial Chemistry, University of Pisa, 56124 Pisa, Italy; (A.C.); (J.L.N.); (F.M.); (A.C.); (S.G.); (V.V.)
- CISUP—Center for the Integration of Scientific Instruments of the University of Pisa, University of Pisa, 56124 Pisa, Italy
| | - Jacopo La Nasa
- Department of Chemistry and Industrial Chemistry, University of Pisa, 56124 Pisa, Italy; (A.C.); (J.L.N.); (F.M.); (A.C.); (S.G.); (V.V.)
| | - Francesca Modugno
- Department of Chemistry and Industrial Chemistry, University of Pisa, 56124 Pisa, Italy; (A.C.); (J.L.N.); (F.M.); (A.C.); (S.G.); (V.V.)
- CISUP—Center for the Integration of Scientific Instruments of the University of Pisa, University of Pisa, 56124 Pisa, Italy
| | - Alessio Ceccarini
- Department of Chemistry and Industrial Chemistry, University of Pisa, 56124 Pisa, Italy; (A.C.); (J.L.N.); (F.M.); (A.C.); (S.G.); (V.V.)
| | - Stefania Giannarelli
- Department of Chemistry and Industrial Chemistry, University of Pisa, 56124 Pisa, Italy; (A.C.); (J.L.N.); (F.M.); (A.C.); (S.G.); (V.V.)
| | - Virginia Vinciguerra
- Department of Chemistry and Industrial Chemistry, University of Pisa, 56124 Pisa, Italy; (A.C.); (J.L.N.); (F.M.); (A.C.); (S.G.); (V.V.)
- CISUP—Center for the Integration of Scientific Instruments of the University of Pisa, University of Pisa, 56124 Pisa, Italy
| | - Monica Bertoldo
- Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, via L. Borsari, 45121 Ferrara, Italy;
- Institute of Organic Synthesis and Photoreactivity, National Research Council of Italy (ISOF-CNR), via P. Gobetti 101, 40129 Bologna, Italy
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Nichols PJ, Falconer I, Griffin A, Mant C, Hodges R, McKnight CJ, Vögeli B, Vugmeyster L. Deuteration of nonexchangeable protons on proteins affects their thermal stability, side-chain dynamics, and hydrophobicity. Protein Sci 2020; 29:1641-1654. [PMID: 32356390 DOI: 10.1002/pro.3878] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 03/10/2020] [Accepted: 04/26/2020] [Indexed: 11/06/2022]
Abstract
We have investigated the effect of deuteration of non-exchangeable protons on protein global thermal stability, hydrophobicity, and local flexibility using well-known thermostable model systems such as the villin headpiece subdomain (HP36) and the third immunoglobulin G-binding domain of protein G (GB3). Reversed-phase high-performance liquid chromatography (RP-HPLC) measurements as a function of temperature probe global thermal stability in the presence of acetonitrile, while differential scanning calorimetry determines thermal stability in solution. Both indicate small but measurable changes in the order of several degrees. RP-HPLC also permitted quantification of the effect of deuteration of just three core phenylalanine side chains of HP36. NMR dynamics investigation has focused on methyl axes motions using cross-correlated relaxation measurements. The analysis of order parameters provided a complex picture indicating that deuteration generally increases motional amplitudes of sub-nanosecond motion in GB3 but decreases those in HP36. Combined with earlier dynamics measurements at Cα -Cβ sites and backbone sites of GB3, which probed slower time scales, the results point to the need to probe multiple atoms in the protein and variety of time scales to the discern the full complexity of the effects of deuteration on dynamics.
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Affiliation(s)
- Parker J Nichols
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado, Aurora, Colorado, USA
| | - Isaac Falconer
- Department of Chemistry, University of Colorado at Denver, Denver, Colorado, USA.,Department of Physiology and Biophysics, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Aaron Griffin
- Department of Chemistry, University of Colorado at Denver, Denver, Colorado, USA
| | - Colin Mant
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado, Aurora, Colorado, USA
| | - Robert Hodges
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado, Aurora, Colorado, USA
| | - Christopher J McKnight
- Department of Physiology and Biophysics, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Beat Vögeli
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado, Aurora, Colorado, USA
| | - Liliya Vugmeyster
- Department of Chemistry, University of Colorado at Denver, Denver, Colorado, USA
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Rho T, Choi SJ, Kil HW, Ko J, Yoon KD. Separation of nine novel triterpene saponins from Camellia japonica seeds using high-performance countercurrent chromatography and reversed-phase high-performance liquid chromatography. Phytochem Anal 2019; 30:226-236. [PMID: 30479045 DOI: 10.1002/pca.2808] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/15/2018] [Accepted: 10/30/2018] [Indexed: 06/09/2023]
Abstract
INTRODUCTION Camellia japonica L. (Theaceae) is an evergreen shrub, which is cultivated as a popular ornamental tree in Korea, China, and Japan and its seeds have been used as a source of cooking oil, in cosmetics and as a traditional medicine. Intensive phytochemical works have revealed that oleanane-type saponins are the characteristic compounds of the seeds of C. japonica. OBJECTIVE The purpose of the present study is to isolate and determine oleanane-type saponins from C. japonica using high-performance countercurrent chromatography (HPCCC) coupled with reversed-phase high-performance liquid chromatography (RP-HPLC) and spectroscopic evidences, respectively. METHODOLOGY HPLC electrospray ionisation quadrupole time-of-flight mass spectrometry (ESI-Q-TOF-MS) was applied to profile the saponin composition of an enriched saponin extract of C. japonica seeds. The enriched saponin extract was separated by HPCCC using a dichloromethane/methanol/isopropanol/water (9:6:1:4, v/v/v/v) system and RP-HPLC. The structures of the isolates were determined utilising ESI-Q-TOF-MS, one-dimensional and two-dimensional NMR and optical rotation. RESULTS HPCCC on enriched saponin extract of C. japonica yielded four saponin fractions in the order of the number of sugars attached to the triterpene aglycone, and preparative RP-HPLC on each saponin fraction led to the isolation of nine novel saponins, namely camoreoside A-I, along with six known ones. CONCLUSIONS This study indicates that combination of HPLC-ESI-Q-TOF-MS analysis and HPCCC coupled with RP-HPLC are excellent tools for discovering saponins from natural sources.
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Affiliation(s)
- Taewoong Rho
- College of Pharmacy and Integrated Research Institute of Pharmaceutical Science, The Catholic University of Korea, Bucheon, Gyeonggi Province, Republic of Korea
| | - Soo-Jung Choi
- College of Pharmacy and Integrated Research Institute of Pharmaceutical Science, The Catholic University of Korea, Bucheon, Gyeonggi Province, Republic of Korea
| | - Hyun Woo Kil
- College of Pharmacy and Integrated Research Institute of Pharmaceutical Science, The Catholic University of Korea, Bucheon, Gyeonggi Province, Republic of Korea
| | - Jaeyoung Ko
- Amorepacific R&D Unit, Yongin, Gyeonggi Province, Republic of Korea
| | - Kee Dong Yoon
- College of Pharmacy and Integrated Research Institute of Pharmaceutical Science, The Catholic University of Korea, Bucheon, Gyeonggi Province, Republic of Korea
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Sun J, Shi J, Wang Y, Chen Y, Li Y, Kong D, Chang L, Liu F, Lv Z, Zhou Y, He F, Zhang Y, Xu P. Multiproteases Combined with High-pH Reverse-Phase Separation Strategy Verified Fourteen Missing Proteins in Human Testis Tissue. J Proteome Res 2018; 17:4171-4177. [PMID: 30280576 DOI: 10.1021/acs.jproteome.8b00397] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Subsequent to conducting the Chromosome-Centric Human Proteome Project, we have focused on human testis-enriched missing proteins (MPs) since 2015. For protein coverage to be enhanced, a multiprotease strategy was used for separation of samples by 10% SDS-PAGE. For the separating efficiency to be improved, a high-pH reverse phase (RP) separation strategy was applied to fractionate complex samples in this study. A total of 11,558 proteins was identified, which is the largest proteome data set for single human tissue sample so far. On the basis of this large-scale data set, we verified 14 MPs (PE2) in neXtProt (2018-01) after spectrum quality analysis, isobaric post-translational modification, and single amino acid variant filtering, and synthesized peptide matching. Tissue expression analysis showed that 3 of 14 MPs were testis-specific proteins. Functional analysis showed that 10 of 14 MPs were closely related to liver tumor, liver carcinoma, and hepatocellular carcinoma. Another 100 MPs were listed as candidates but required additional verification information. All MS data sets have been deposited into the ProteomeXchange with the identifier PXD009737.
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Affiliation(s)
- Jinshuai Sun
- Hebei Province Key Lab of Research and Application on Microbial Diversity, College of Life Sciences , Hebei University , Baoding , Hebei 071002 , China.,State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing) , Beijing Institute of Lifeomics , Beijing 102206 , China
| | - Jiahui Shi
- Hebei Province Key Lab of Research and Application on Microbial Diversity, College of Life Sciences , Hebei University , Baoding , Hebei 071002 , China.,State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing) , Beijing Institute of Lifeomics , Beijing 102206 , China
| | - Yihao Wang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing) , Beijing Institute of Lifeomics , Beijing 102206 , China
| | - Yang Chen
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing) , Beijing Institute of Lifeomics , Beijing 102206 , China
| | - Yanchang Li
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing) , Beijing Institute of Lifeomics , Beijing 102206 , China
| | - Degang Kong
- Department of Hepatopancreatobiliary Surgery , The Second Affiliated Hospital of Tianjin Medical University , Tianjin 300211 , China
| | - Lei Chang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing) , Beijing Institute of Lifeomics , Beijing 102206 , China
| | - Fengsong Liu
- Hebei Province Key Lab of Research and Application on Microbial Diversity, College of Life Sciences , Hebei University , Baoding , Hebei 071002 , China
| | - Zhitang Lv
- Hebei Province Key Lab of Research and Application on Microbial Diversity, College of Life Sciences , Hebei University , Baoding , Hebei 071002 , China
| | - Yue Zhou
- Demo Laboratory of Thermofisher Scientific China , Shanghai 200120 , China
| | - Fuchu He
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing) , Beijing Institute of Lifeomics , Beijing 102206 , China
| | - Yao Zhang
- State Key Laboratory of Biocontrol, Guangdong Key Laboratory of Plant Resources, School of Life Sciences , Sun Yat-Sen University , Guangzhou 510275 , China
| | - Ping Xu
- Hebei Province Key Lab of Research and Application on Microbial Diversity, College of Life Sciences , Hebei University , Baoding , Hebei 071002 , China.,State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing) , Beijing Institute of Lifeomics , Beijing 102206 , China.,Key Laboratory of Combinational Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, School of Pharmaceutical Science , Wuhan University , Wuhan 430072 , China
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Alhazmi HA, Alnami AM, Arishi MAA, Alameer RK, Al Bratty M, Rehman ZU, Javed SA, Arbab IA. A Fast and Validated Reversed-Phase HPLC Method for Simultaneous Determination of Simvastatin, Atorvastatin, Telmisartan and Irbesartan in Bulk Drugs and Tablet Formulations. Sci Pharm 2017; 86:E1. [PMID: 29257120 DOI: 10.3390/scipharm86010001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 12/08/2017] [Accepted: 12/08/2017] [Indexed: 12/16/2022] Open
Abstract
The aim of this study was to develop and validate a fast and simple reversed-phase HPLC method for simultaneous determination of four cardiovascular agents-atorvastatin, simvastatin, telmisartan and irbesartan in bulk drugs and tablet oral dosage forms. The chromatographic separation was accomplished by using Symmetry C18 column (75 mm × 4.6 mm; 3.5 μ) with a mobile phase consisting of ammonium acetate buffer (10 mM; pH 4.0) and acetonitrile in a ratio 40:60 v/v. Flow rate was maintained at 1 mL/min up to 3.5 min, and then suddenly changed to 2 mL/min till the end of the run (7.5 min). The data was acquired using ultraviolet detector monitored at 220 nm. The method was validated for linearity, precision, accuracy and specificity. The developed method has shown excellent linearity (R² > 0.999) over the concentration range of 1-16 µg/mL. The limits of detection (LODs) and limits of quantification (LOQs) were in the range of 0.189-0.190 and 0.603-0.630 µg/mL, respectively. Inter-day and intra-day accuracy and precision data were recorded in the acceptable limits. The new method has successfully been applied for quantification of all four drugs in their tablet dosage forms with percent recovery within 100 ± 2%.
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Wu Q, Shah NP. Gas release-based prescreening combined with reversed-phase HPLC quantitation for efficient selection of high-γ-aminobutyric acid (GABA)-producing lactic acid bacteria. J Dairy Sci 2014; 98:790-7. [PMID: 25497828 DOI: 10.3168/jds.2014-8808] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 11/08/2014] [Indexed: 12/26/2022]
Abstract
High γ-aminobutyric acid (GABA)-producing lactobacilli are promising for the manufacture of GABA-rich foods and to synthesize GRAS (generally recognized as safe)-grade GABA. However, common chromatography-based screening is time-consuming and inefficient. In the present study, Korean kimchi was used as a model of lactic acid-based fermented foods, and a gas release-based prescreening of potential GABA producers was developed. The ability to produce GABA by potential GABA producers in de Man, Rogosa, and Sharpe medium supplemented with or without monosodium glutamate was further determined by HPLC. Based on the results, 9 isolates were regarded as high GABA producers, and were further genetically identified as Lactobacillus brevis based on the sequences of 16S rRNA gene. Gas release-based prescreening combined with reversed-phase HPLC confirmation was an efficient and cost-effective method to identify high-GABA-producing LAB, which could be good candidates for probiotics. The GABA that is naturally produced by these high-GABA-producing LAB could be used as a food additive.
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Affiliation(s)
- Qinglong Wu
- Food and Nutritional Science, School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Nagendra P Shah
- Food and Nutritional Science, School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong.
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Bras G, Bochenska O, Rapala-Kozik M, Guevara-Lora I, Faussner A, Kamysz W, Kozik A. Release of biologically active kinin peptides, Met-Lys-bradykinin and Leu-Met-Lys-bradykinin from human kininogens by two major secreted aspartic proteases of Candida parapsilosis. Peptides 2013; 48:114-23. [PMID: 23954712 DOI: 10.1016/j.peptides.2013.08.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2013] [Revised: 08/01/2013] [Accepted: 08/01/2013] [Indexed: 02/06/2023]
Abstract
In terms of infection incidence, the yeast Candida parapsilosis is the second after Candida albicans as causative agent of candidiases in humans. The major virulence factors of C. parapsilosis are secreted aspartic proteases (SAPPs) which help the pathogen to disseminate, acquire nutrients and dysregulate the mechanisms of innate immunity of the host. In the current work we characterized the action of two major extracellular proteases of C. parapsilosis, SAPP1 and SAPP2, on human kininogens, proteinaceous precursors of vasoactive and proinflammatory bradykinin-related peptides, collectively called the kinins. The kininogens, preferably the form with lower molecular mass, were effectively cleaved by SAPPs, with the release of two uncommon kinins, Met-Lys-bradykinin and Leu-Met-Lys-bradykinin. While optimal at acidic pH (4-5), the kinin release yield was only 2-3-fold lower at neutral pH. These peptides were able to interact with cellular kinin receptors of B2 subtype and to stimulate the human endothelial cells HMEC-1 to increased secretion of proinflammatory interleukins (ILs), IL-1β and IL-6. The analysis of the stability of SAPP-generated kinins in plasma suggested that they are biologically equivalent to bradykinin, the best agonist of B2 receptor subtype and can be quickly converted to des-Arg(9)-bradykinin, the agonist of inflammation-inducible B1 receptors.
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Affiliation(s)
- Grazyna Bras
- Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Krakow, Poland
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Shabir GA. Development and Validation of a Reversed-phase HPLC Method for the Determination of Hydroxybenzene in a Cream Formulation. Indian J Pharm Sci 2010; 72:307-11. [PMID: 21188038 PMCID: PMC3003162 DOI: 10.4103/0250-474x.70475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2009] [Revised: 01/10/2010] [Accepted: 04/15/2010] [Indexed: 11/04/2022] Open
Abstract
A rapid, sensitive and specific reversed-phase high performance liquid chromatographic method with diode-array detection has been developed and validated for the determination of hydroxybenzene (0.494%, w/w) in a commercially available cream pharmaceutical formulation. Isocratic chromatography was performed on a C18 column with methanol-water 60:40 (v/v) containing 0.1% phosphoric acid (v/v) as mobile phase at a flow rate of 1.0 ml/min. UV detection was at 254 nm. Linearity of the method was excellent (r(2) = 0.9999). The relative standard deviation values for intra- and inter-day precision studies were < 1% and the recovery of hydroxybenzene was >99%. The limit of detection and quantitation for hydroxybenzene was found to be 13.5 η g/ml and 2 μg/ml, respectively. The method was also validated for specificity and robustness. The method was found to be robust and can be reliably used to determine the hydroxybenzene content of marketed formulations.
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Affiliation(s)
- G A Shabir
- Oxford Brookes University, School of Life Sciences, Headington Campus, Oxford, OX3 0BP, United Kingdom
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Ohrui H. Development of highly potent chiral discrimination methods that solve the problems of the diastereomer method. Proc Jpn Acad Ser B Phys Biol Sci 2007; 83:127-35. [PMID: 24019591 PMCID: PMC3756875 DOI: 10.2183/pjab.83.127] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2007] [Accepted: 05/01/2007] [Indexed: 06/02/2023]
Abstract
The development of highly potent chiral discrimination methods that solve the problems of the diastereomer method, in which it is impossible to discriminate the diastereomers having chiral centers separated by more than four bonds, is described. On the basis of the results obtained, a new hypothesis, Induced Chiral Fields that the achiral reversed phase can provide chiral fields depending on the structures of the eluents, is proposed to explain the significant results of separation of the diastereomers derived from newly developed chiral and fluorescent labeling reagents and optical isomers by reversed-phase HPLC, which was hitherto impossible.
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