Uma nova abordagem analítica sobre teores de 'Zn' por HR-CSAAS em plantas medicinais voltadas ao emagrecimento

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dc.contributor.advisorGomes Neto, José Anchieta [UNESP]
dc.contributor.advisorMoraes, Mercedes de [UNESP]
dc.contributor.authorIshikawa, Fabio Genhiro [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2016-01-13T13:26:23Z
dc.date.available2016-01-13T13:26:23Z
dc.date.issued2011
dc.description.abstractThe following research project deals with the development of new analytical procedures aimed at the identification and quantification of the element zinc in different fractions of vegetable drugs used for weight loss, using the high-resolution continuum source atomic absorption spectrometry in flame. The determination of the levels of zinc was made in an AnalytikJena ContrAA 300 spectrometer in the principal line of Zn at 213.857 nm and wavelength integrated absorbance equal to 3 pixels. Calibration curves were obtained with linear dynamic range from 0.10 to 1.00 mg L-1, correlation coefficient equal to 0.9991 and limit of detection equal to 0.020 mg L-1. The total Zn content in the samples obtained after microwave-assisted acid digestion system were: 28.06 mg kg-1 (Artichoke), 31.49 mg kg-1 (Chamomile), 77.16 mg kg-1 (Gorse), 105.38 mg kg-1 (Horsetail), 32.37 mg kg-1 (Fennel) and 5.00 mg kg-1 (Senna). The extraction in aqueous environment assisted by microwave radiation produced extracts containing: 5.40 mg kg-1 (Artichoke), 10.65 mg kg-1 (Chamomile), 14.83 mg kg-1 (Gorse), 18.90 mg kg-1 (Horsetail), 7.80 mg kg-1 (Fennel), 3.24 mg kg-1 (Senna), corresponding to 19%, 34%, 19%, 18%, 24% and 64% of their total content of Zn, respectively. The amounts of Zn in the extracted samples from some plants indicate that this metal was strongly bounded to the plant's matrix. The sequential extraction using solvents and mixtures with different polarities (n-hexane, ethyl acetate, propanol, methanol, ethanol-water 1:1 (v/v), water) aimed the separation of different Zn containing species and water was considered the most efficient extractor. The Zn contents extracted were: 14.82 mg kg-1 (Artichoke), 16.82 mg kg-1 (Chamomile), 34.09 mg kg-1 (Gorse), 4.75 mg kg-1 (Senna), corresponding to 53% in the first two samples, 44% and 95% for the last two, respectively. It was observed that Zn is found complexed underen
dc.format.extent44 f.
dc.identifier.aleph000679525
dc.identifier.citationISHIKAWA, Fabio Genhiro. Uma nova abordagem analítica sobre teores de 'Zn' por HR-CSAAS em plantas medicinais voltadas ao emagrecimento. 2011. 44 f. Trabalho de conclusão de curso (bacharelado - Química) - Universidade Estadual Paulista, Instituto de Química de Araraquara, 2011.
dc.identifier.filehttp://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2015-12-22/000679525.pdf
dc.identifier.lattes8708735699846578
dc.identifier.urihttp://hdl.handle.net/11449/132482
dc.language.isopor
dc.publisherUniversidade Estadual Paulista (Unesp)
dc.rights.accessRightsAcesso aberto
dc.sourceAleph
dc.subjectMedicinal plantsen
dc.subjectSequential extractionen
dc.subjectPlantas medicinaispt
dc.subjectEspectrometria de absorção atômicapt
dc.subjectExtração sequencialpt
dc.subjectZincopt
dc.titleUma nova abordagem analítica sobre teores de 'Zn' por HR-CSAAS em plantas medicinais voltadas ao emagrecimentopt
dc.typeTrabalho de conclusão de curso
unesp.author.lattes8708735699846578
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt
unesp.undergraduateQuímica - IQpt

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