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Shen Y, Luo X, Guan Q, Cheng L. LC–MS/MS method for determination of urinary fractionated metanephrines and 3-methoxytyramine and its application in diagnosis of pheochromocytoma. Chromatographia 2023. [DOI: 10.1007/s10337-023-04239-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Li L, Sun R, Zenga J, Himburg H, Wang L, Duan S, Liu J, Bui D, Xie Z, Du T, Xie L, Yin T, Wong S, Gao S, Hu M. Comparison of Absolute Expression and Turnover Number of COX-1 and COX-2 in Human and Rodent Cells and Tissues. J Inflamm Res 2022; 15:4435-4447. [PMID: 35958187 PMCID: PMC9359786 DOI: 10.2147/jir.s365842] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 06/23/2022] [Indexed: 11/30/2022] Open
Abstract
Objective We aim to quantify the absolute protein expression of cyclooxygenase-1 (COX-1) and cyclooxygenase-2 (COX-2) in various cells and tissues to determine the relative contribution of COX-1 and COX-2 to PGE2 production. Methods An LC-MS method was developed and validated, then used for quantifying the absolute amounts of COX-1 and COX-2 in recombinant human COX-1 and COX-2, lysates from different cells, tissue microsomes of rodents and humans, Pirc rat colonic polyps, and biopsy specimens from squamous cell carcinoma (SCC) patients. The COX-1 and COX-2 turnover numbers were subsequently calculated based on apparent formation rates of PGE2. Results A robust LC-MS method for quantification of COX-1 and COX-2 was developed and validated and then used to calculate their apparent turnover numbers. The results showed that COX-1 expression levels were much higher than that of COX-2 in all the tested tissues including the colonic epithelium of F344 (28-fold) and Pirc rats (20-fold), colonic polyps of Pirc rats (8-fold), and biopsy specimens of SCC patients (11–17-fold). In addition, both COX-1 and COX-2 were higher in polyps when compared to adjacent mucosa of Pirc rats. The turnover number of recombinant human COX-2 was 14-fold higher than that of recombinant human COX-1. LPS stimulation increased COX-2 protein expression in three cell lines (Raw 264.7, SCC9 and EOMA) as expected but unexpectedly increased COX-1 protein expression (13.8-fold) in EOMA cells. Conclusion In human oral cancer tissues and cells as well as Pirc rat colon, COX-1 plays an unexpectedly but more important role than COX-2 in abnormal PGE2 production since COX-1 expression is much higher than COX-2. In addition, COX-1 expression levels are inducible in cells, and higher in polyps than surrounding mucosa in Pirc rat colon. These results indicate that targeted suppression of local COX-1 should be considered to reduce colon-specific PGE2-mediated inflammation.
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Affiliation(s)
- Li Li
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
| | - Rongjin Sun
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
| | - Joseph Zenga
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Heather Himburg
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Lu Wang
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
| | - Shengnan Duan
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
| | - Jingwen Liu
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
| | - Dinh Bui
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
| | - Zuoxu Xie
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
| | - Ting Du
- Department of Pharmaceutical Science, College of Pharmacy and Health Sciences, Texas Southern University, Houston, TX, USA
| | - Lijun Xie
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
| | - Taijun Yin
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
| | - Stu Wong
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Song Gao
- Department of Pharmaceutical Science, College of Pharmacy and Health Sciences, Texas Southern University, Houston, TX, USA
- Song Gao, Department of Pharmaceutical Science, College of Pharmacy and Health Sciences, Texas Southern University, Houston, TX, USA, Email
| | - Ming Hu
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
- Correspondence: Ming Hu, Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA, Email
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Harris KJ, Subbiah S, Tabatabai M, Archibong AE, Singh KP, Anderson TA, Adunyah SE, Ramesh A. Pressurized liquid extraction followed by liquid chromatography coupled to a fluorescence detector and atmospheric pressure chemical ionization mass spectrometry for the determination of benzo(a)pyrene metabolites in liver tissue of an animal model of colon cancer. J Chromatogr A 2020; 1622:461126. [PMID: 32376019 DOI: 10.1016/j.chroma.2020.461126] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 04/07/2020] [Accepted: 04/08/2020] [Indexed: 02/07/2023]
Abstract
Since metabolism is implicated in the carcinogenesis of toxicants, an efficient extraction method together with an analytical method is warranted to quantify tissue burdens of a carcinogen and/or its metabolites. Therefore, the aim of this study was to validate a pressurized liquid extraction (PLE) method for measuring metabolites of benzo(a)pyrene [B(a)P; a food-borne carcinogen] from tissue samples. The sample extraction was performed separately by PLE and liquid-liquid extraction (LLE). PLE followed by high-performance liquid chromatography coupled to online fluorescence detector (HPLC-FLD) was used to quantify separated analytes; and by ultra-high-performance liquid chromatography (UHPLC) coupled to atmospheric pressure chemical ionization tandem mass spectrometry (UHPLC-APCI-MS/MS) were used for confirmation purposes. The UHPLC-MS/MS was set-up in the atmospheric pressure chemical ionization (APCI) positive interface with selective reaction monitoring (SRM). The analytical performance characteristics of the PLE technique was assessed at different temperatures, pressure, number of cycles and solvent types. A methanol + chloroform + water mixture (30:15:10, v/v/v) yielded greater recoveries at an extraction temperature range of 60-80°C, pressure of 10 MPa and an extraction time of 10 min. The PLE method was validated by the analysis of spiked tissue samples and measuring recoveries and limits of quantitation for the analytes of interest using HPLC-FLD equipment. The optimized PLE-HPLC-FLD method was used to quantify the concentrations of B(a)P metabolites in liver samples obtained from a colon cancer animal model. Overall, PLE performed better in terms of extraction efficiency, recovery of B(a)P metabolites and shortened sample preparation time when compared with the classic LLE method.
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Affiliation(s)
- Kenneth J Harris
- Department of Biochemistry, Cancer Biology, Neuroscience & Pharmacology, Meharry Medical College, 1005 Dr. D.B. Todd Blvd., Nashville, TN 37208, USA
| | - Seenivasan Subbiah
- Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Lubbock, TX 79409, USA
| | - Mohammad Tabatabai
- School of Graduate Studies & Research, Meharry Medical College, Nashville, TN 37208, USA
| | - Anthony E Archibong
- Department of Microbiology, Immunology and Physiology, Meharry Medical College, Nashville, TN 37208, USA
| | - Kamaleshwar P Singh
- Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Lubbock, TX 79409, USA
| | - Todd A Anderson
- Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Lubbock, TX 79409, USA
| | - Samuel E Adunyah
- Department of Biochemistry, Cancer Biology, Neuroscience & Pharmacology, Meharry Medical College, 1005 Dr. D.B. Todd Blvd., Nashville, TN 37208, USA
| | - Aramandla Ramesh
- Department of Biochemistry, Cancer Biology, Neuroscience & Pharmacology, Meharry Medical College, 1005 Dr. D.B. Todd Blvd., Nashville, TN 37208, USA.
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Chemopreventive Agent 3,3'-Diindolylmethane Inhibits MDM2 in Colorectal Cancer Cells. Int J Mol Sci 2020; 21:ijms21134642. [PMID: 32629830 PMCID: PMC7370074 DOI: 10.3390/ijms21134642] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 06/28/2020] [Indexed: 11/24/2022] Open
Abstract
3,3′-Diindolylmethane (DIM) is a naturally derived chemopreventive compound. It comes from glucobrassicin, an indole glucosinolate enriched in cruciferous vegetables, and is formed in the acidic environment of the stomach after ingestion. Mouse double minute 2 homolog (MDM2) is an important, multi-functional oncogenic protein and it has been well recognized for its negative regulation of the tumor suppressor protein p53. We discovered a novel mechanism of action of DIM, that it directly inhibits MDM2 in multiple colorectal cancer (CRC) cell lines. Treatment with DIM decreased MDM2 at messenger RNA (mRNA) and protein levels, inhibited cancer cell proliferation, and induced cell cycle arrest and apoptosis. DIM-induced decrease of MDM2 is p53-independent and is partly mediated by proteasome degradation of MDM2, as blocking of the proteasome activity reversed MDM2 protein inhibition. Overexpression of MDM2 blocked DIM’s effects in growth suppression and apoptosis induction. When combined with imidazoline MDM2 inhibitors (Nutlin-3a and Idasanutlin/RG-7388), synergism was observed in cancer cell growth inhibition. In summary, our data support a new mechanism of action for DIM in direct inhibition of MDM2. The identification of MDM2 as a novel DIM target may help develop a new strategy in CRC prevention.
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Fu H, Zhang QL, Huang XW, Ma ZH, Zheng XL, Li SL, Duan HN, Sun XC, Lin FF, Zhao LJ, Teng GS, Liu J. A rapid and convenient derivatization method for quantitation of short-chain fatty acids in human feces by ultra-performance liquid chromatography/tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8730. [PMID: 31952097 DOI: 10.1002/rcm.8730] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 01/16/2020] [Accepted: 01/16/2020] [Indexed: 06/10/2023]
Abstract
RATIONALE Short-chain fatty acids (SCFAs) are associated with intestinal microbiota and diseases in humans. SCFAs have a low response in mass spectrometry, and in order to increase sensitivity, reduce sample consumption, shorten analysis time, and simplify sample preparation steps, a derivatization method was developed. METHODS We converted seven SCFAs into amide derivatives with 4-aminomethylquinoline. The reaction occurred for 20 min at room temperature. The analytes were separated on a reversed-phase C18 column and quantitated in the positive ion electrospray ionization mode using multiple reaction monitoring. Acetic acid-d4 was used as the stable-isotope-labeled surrogate analyte for acetic acid in the working solutions, while the other stable-isotope-labeled standards were used as internal standards (ISs). RESULTS Method validation showed that the intra-day and inter-day precision of quantitation for the seven SCFAs over the whole concentration range was ≤3.8% (n = 6). The quantitation accuracy ranged from 85.5% to 104.3% (n = 6). Most important, the collected feces were vortexed immediately with ethanol. CONCLUSIONS This study provides a new derivatization method for a precise, accurate, and rapid quantitation of SCFAs in human feces using ultra-performance liquid chromatography/tandem mass spectrometry. This method successfully determined the concentration of SCFAs in human feces and could assist in the exploration of intestinal microbiota and diseases.
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Affiliation(s)
- Huan Fu
- School of Chemistry and Life Sciences, Changchun University of Technology, Changchun, China
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Qing-Li Zhang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | | | - Zheng-Hua Ma
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Xiao-Li Zheng
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Shi-Lin Li
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Hao-Nan Duan
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Xiao-Chu Sun
- School of Chemistry and Life Sciences, Changchun University of Technology, Changchun, China
| | - Fei-Fei Lin
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Li-Juan Zhao
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Guo-Sheng Teng
- School of Chemistry and Life Sciences, Changchun University of Technology, Changchun, China
| | - Jia Liu
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
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Acute changes in colonic PGE 2 levels as a biomarker of efficacy after treatment of the Pirc (F344/NTac-Apc am1137) rat with celecoxib. Inflamm Res 2019; 69:131-137. [PMID: 31797003 DOI: 10.1007/s00011-019-01300-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 09/19/2019] [Accepted: 09/26/2019] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE This study sought to evaluate short-term treatment with COX-2 inhibitors and acute changes in colonic PGE2 levels as predictors of long-term efficacy in a genetic model of colorectal cancer. METHODS Celecoxib oral suspension (40 mg/kg BID) was dosed to Apc-mutant Pirc (F344/NTac-Apcam1137) rats for 4 days (short-term group), or the equivalent dose of 1500 ppm celecoxib was administered in the diet for 4 months (long-term group). Percent inhibition of colonic PGE2 was calculated, and the reduction in colonic PGE2 was assessed in relation to suppression of adenomatous colon polyps. RESULTS Colonic mucosa PGE2 was fourfold higher in Pirc than in F344 wild-type rats (21 vs. 5.6 pg/mg epithelial tissue), due at least in part to higher COX-2 expression, and this was confirmed by elevated PGE2-d11 levels in Pirc colonic S9 incubations. In the 4-day study, dose-dependent reductions in PGE2 were observed in colonic epithelium (-33% (P>0.05) and -57% (P=0.0012)), after low- and high-dose celecoxib treatments of 4 mg/kg and 40 mg/kg (bid), respectively. In the 4-month study, 1500 ppm celecoxib suppressed colonic epithelium PGE2 by 43.5%, and tumor multiplicity by 80% (P<0.0015). Suppression of plasma 6-keto PGF1α also was corroborated following long-term treatment with 1500 ppm celecoxib (P<0.05). CONCLUSIONS Acute changes in colonic mucosa PGE2 provided a rapid means of predicting long-term chemopreventive effects from celecoxib, and might be useful for screening of new COX-2 inhibitor compounds.
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Mei YB, Luo SB, Ye LY, Zhang Q, Guo J, Qiu XJ, Xie SL. Validated UPLC-MS/MS method for quantification of fruquintinib in rat plasma and its application to pharmacokinetic study. DRUG DESIGN DEVELOPMENT AND THERAPY 2019; 13:2865-2871. [PMID: 31616134 PMCID: PMC6699497 DOI: 10.2147/dddt.s199362] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Accepted: 07/25/2019] [Indexed: 11/23/2022]
Abstract
A new, simple, and sensitive ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method for quantification of fruquintinib was established to assess the pharmacokinetics of fruquintinib in the rat. The internal standard working solution was added to the plasma sample for extraction before analysis. The Acquity UPLC BEH C18 chromatography column (2.1 mm ×50 mm, 1.7 μm) was used to separated analytes under gradient elution using acetonitrile and 0.1% formic acid as the mobile phase. Positive multiple reaction monitoring modes were chosen to detect fruquintinib and diazepam (IS). The precursor-to-product ion transitions were 394.2 → 363.2 for fruquintinib and m/z 285 → 154 for IS. The current method was linear over the concentration range of 1.0-1000 ng/mL for fruquintinib with a correlation coefficient of 0.9992 or better. The matrix effect of fruquintinib and IS was acceptable under the current method. The intra- and interday precision (RSD%) and accuracy (RE%) were within 11.9% and ±13.7%, respectively. The recovery, stability, and sensitivity were validated according to the United States Food and Drug Administration (FDA) regulations for bioanalytical method validation. The analytical method had been validated and applied to a pharmacokinetic study of fruquintinib in rat.
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Affiliation(s)
- Yi-Bin Mei
- Department of Cardiology, The People's Hospital of Lishui, Lishui, Zhejiang 323000, People's Republic of China
| | - Shun-Bin Luo
- Department of Clinical Pharmacy, The People's Hospital of Lishui, Lishui, Zhejiang 323000, People's Republic of China
| | - Ling-Yan Ye
- Department of Cardiology, The People's Hospital of Lishui, Lishui, Zhejiang 323000, People's Republic of China
| | - Qiang Zhang
- Department of Clinical Laboratory, The People's Hospital of Lishui, Lishui, Zhejiang 323000, People's Republic of China
| | - Jing Guo
- Department of Regional Medical Union, The People's Hospital of Lishui, Lishui, Zhejiang 323000, People's Republic of China
| | - Xiang-Jun Qiu
- Department of pharmacology, Medical College of Henan University of Science and Technology, Luoyang 471003, People's Republic of China
| | - Sai-Li Xie
- Department of Ultrasonic imaging, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325035, People's Republic of China
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Canzi EF, Lopes BR, Robeldo T, Borra R, Da Silva MFGF, Oliveira RV, Maia BHNS, Cass QB. Prostaglandins E 2 and F 2α levels in human menstrual fluid by online Solid Phase Extraction coupled to Liquid Chromatography tandem Mass Spectrometry (SPE-LC-MS/MS). J Chromatogr B Analyt Technol Biomed Life Sci 2019; 1109:60-66. [PMID: 30731263 DOI: 10.1016/j.jchromb.2019.01.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 12/04/2018] [Accepted: 01/26/2019] [Indexed: 01/01/2023]
Abstract
This paper reports an online SPE-LC-MS/MS method for the simultaneous quantification of prostaglandins (PGE2 and PGF2α) in menstrual fluid samples. To meet this goal human peripheral serum was used as surrogate matrix. The analytes were trapped on an OASIS HLB cartridge for 3 min, for sample cleanup and enrichment, and then transferred during only 42 s to an HSS T3 C18 analytical column, for separation and analysis. Prostaglandins (PGs) were detected by selected reaction monitoring in negative ion mode, PGE2 (m/z 351 → 315) and PGF2α (m/z 353 → 193) using isotope-labeled internal standard (PGE2-d4, m/z 355 → 319). The concentration linear range was of 10.34-1.034 ng mL-1 and the lower limit of quantification (LLOQ) was 10.34 ng mL-1 for both PGs. Validation parameters were successfully assessed according to the European Medicines Agency guideline (EMA), also comprising the FDA normative. The method showed no matrix effect and process efficiency around 100%, in addition to only 15 min of analysis time with lower solvent consumption. The method application was carried out using two menstrual fluid sample groups: control (n = 15) and treatment group (n = 7; samples from women that used Tahiti lemon juice). The PGF2α levels were found to be higher in treated group than in control group (p ≤ 0.05), denoting an effect of the intake of Tahiti lemon juice on the menstrual inflammatory process. The on-line method herein reported could be useful for the analysis of PGs from large research studies.
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Affiliation(s)
- Edione F Canzi
- Departamento de Química, Universidade Federal do Paraná (UFPR), Centro Politécnico, Jardim das Américas, Curitiba, PR 81531-990, Brazil; Departamento de Química, Universidade Federal de São Carlos, Rodovia Washington Luís, km 235, SP-310, São Carlos, SP 13565-905, Brazil
| | - Bianca Rebelo Lopes
- Departamento de Química, Universidade Federal de São Carlos, Rodovia Washington Luís, km 235, SP-310, São Carlos, SP 13565-905, Brazil
| | - Thaiane Robeldo
- Departamento de Genética e Evolução, Universidade Federal de São Carlos, Rodovia Washington Luís, km 235, SP-310, São Carlos, SP 13565-905, Brazil
| | - Ricardo Borra
- Departamento de Genética e Evolução, Universidade Federal de São Carlos, Rodovia Washington Luís, km 235, SP-310, São Carlos, SP 13565-905, Brazil
| | - Maria Fatima G F Da Silva
- Departamento de Química, Universidade Federal de São Carlos, Rodovia Washington Luís, km 235, SP-310, São Carlos, SP 13565-905, Brazil
| | - Regina V Oliveira
- Departamento de Química, Universidade Federal de São Carlos, Rodovia Washington Luís, km 235, SP-310, São Carlos, SP 13565-905, Brazil
| | - Beatriz Helena N S Maia
- Departamento de Química, Universidade Federal do Paraná (UFPR), Centro Politécnico, Jardim das Américas, Curitiba, PR 81531-990, Brazil
| | - Quezia B Cass
- Departamento de Química, Universidade Federal de São Carlos, Rodovia Washington Luís, km 235, SP-310, São Carlos, SP 13565-905, Brazil.
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