| dc.creator | Fujiwara S.T. | |
| dc.creator | Pessoa C.A. | |
| dc.creator | Gushikem Y. | |
| dc.date | 2002 | |
| dc.date | 2015-06-30T16:38:40Z | |
| dc.date | 2015-11-26T15:30:23Z | |
| dc.date | 2015-06-30T16:38:40Z | |
| dc.date | 2015-11-26T15:30:23Z | |
| dc.date.accessioned | 2018-03-28T22:38:52Z | |
| dc.date.available | 2018-03-28T22:38:52Z | |
| dc.identifier | | |
| dc.identifier | Analytical Letters. , v. 35, n. 7, p. 1117 - 1134, 2002. | |
| dc.identifier | 32719 | |
| dc.identifier | 10.1081/AL-120005962 | |
| dc.identifier | http://www.scopus.com/inward/record.url?eid=2-s2.0-0036074605&partnerID=40&md5=c5f920320f5c9771ebe4a0eff580a182 | |
| dc.identifier | http://www.repositorio.unicamp.br/handle/REPOSIP/101329 | |
| dc.identifier | http://repositorio.unicamp.br/jspui/handle/REPOSIP/101329 | |
| dc.identifier | 2-s2.0-0036074605 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1261978 | |
| dc.description | Copper (II) tetrasulphophthalocyanine, CuPc4-, was encapsulated in a n-propylpyridinium silsesquioxane polymer, SiPy+Cl-, immobilized on the SiO2/Al2O3 surface. The material obtained incorporated in a carbon paste electrode, presented the property of electrocatalysing the oxidation of ascorbic acid at 0.18 vs SCE. It was observed that the anodic peak potential at different solution pH remained practically constant between pH 5 and 8 and shifted to more positive potentials below pH 5. The electrode showed a very reproducible response and was chemically stable under various oxidation-reduction cycles. By amperometric measurements, a linear response was obtained in the range of 1 × 10-4-1.4 × 10-3 mol1-1 of ascorbic acid. The modified electrode was used to determine ascorbic acid (vitamin C) in tablets. The results were validated by comparison with the results obtained by using the standard 2,6-dichlorophenolindophenol titration method. | |
| dc.description | 35 | |
| dc.description | 7 | |
| dc.description | 1117 | |
| dc.description | 1134 | |
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| dc.description | Ribeiro, E.S., Gushikem, Y., (1999) Cobalt(II) Tetrasulfophthalocyanine Complex Adsorbed on a Silica Gel Surface Chemically Modified with 3-n-propylpyridinium Chloride: Oxalic Acid Oxidation Study Electroanalysis, 11 (17), pp. 1280-1284 | |
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| dc.description | Guerra, S.V., Kubota, L.T., Xavier, C.R., Nakagaki, S., Experimental optimization of seletive hydrazine detection in flow injection analysis using a carbon paste electrode modified with copper porphyrin occlued into zeolite cavity (1999) Anal. Sci., 15 (12), pp. 1231-1234 | |
| dc.description | Alfaya, R.V.S., Gushikem, Y., Aluminum oxide coated cellulose fibers modified with n-propylpyridinium chloride silsesquioxane polymer: Preparation, characterization, and adsorption of some metal halides from ethanol solution (1999) J. Colloid Interface Sci., 213 (2), pp. 438-444 | |
| dc.description | Alfaya, R.V.S., Gushikem, Y., Alfaya, A.A.S., n-propylpyridinium chloride silsesquioxane polymer film on graphite: Electrochemical study of a hexacyanoferrate(II) ion immobilized electrode for oxidation of ascorbic acid (2000) J. Braz. Chem. Soc., 11 (3), pp. 281-285 | |
| dc.description | Fujiwara, S.T., Gushikem, Y., Alfaya, R.V.S., Adsorption of FeCl3, CuCl2 and ZnCl2 on silsesquioxane 3-n-propylpyridiniumchloride polymer film adsorbed on Al2O3 coated silica gel (2001) Colloids Surf. A, 178 (1-3), pp. 135-141 | |
| dc.description | Alfaya, R.V.S., Alfaya, A.A.S., Gushikem, Y., Rath, S., Reyes, F.G.R., Ion selective electrode for potentiometric determination of saccharin using a thin film of silsesquioxane 3-n-propylpyridinium chloride polymer coated-graphite rod (2000) Anal. Lett., 33 (14), pp. 2859-2871 | |
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| dc.description | Pessoa, C.A., Gushikem, Y., Kubota, L.T., Electrochemical study of methylene blue immobilized in zirconium phosphate (1997) Electroanalysis, 9 (10), pp. 800-803 | |
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| dc.description | Pessoa, C.A., Gushikem, Y., Cobalt(II) metallated hematoporphyrin IX and protoporphyrin IX immobilized on niobium(V) oxide grafted on a silica gel surface: Electrochemical studies (1999) J. Electroanal. Chem., 477 (2), pp. 158-163 | |
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| dc.language | en | |
| dc.publisher | | |
| dc.relation | Analytical Letters | |
| dc.rights | fechado | |
| dc.source | Scopus | |
| dc.title | Copper (ii) Tetrasulpho-phthalocyanine Entrapped In A Propylpyridiniumsilsesquioxane Polymer Immobilized On A Sio2/al2o3 Surface: Use For Electrochemical Oxidation Of Ascorbic Acid | |
| dc.type | Artículos de revistas | |
