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| 5. |  | BOZZATO, J. V.; SILVA, P. A. D. DA; PAGANI JUNIOR, A.; ESPÍRITO SANTO, L. E. DO; COSTA, F. A. da; WINCKLER, L. T.; TAVARES, V. E. Q. Caracterização morfométrica da bacia do Epaminondas com uso de Srtm no Swat+ e Grass gis. In: SIMPÓSIO BRASILEIRO DE RECURSOS HIDRÍCOS, 25., 2023, Aracaju. Anais... Aracaju: ABRHidro, 2023. XXV SBRH.| Biblioteca(s): Embrapa Clima Temperado. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Rondônia. Para informações adicionais entre em contato com cpafro.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
06/02/2018 |
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Data da última atualização: |
06/02/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
LUNA, A. S.; SILVA, A. P. da; ALVES, E. A.; ROCHA, R. B.; LIMA, I. C. A.; GOIS, J. S. de. |
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Afiliação: |
Aderval S. Luna, UFRJ; Arnaldo P. da Silva, UFRJ; ENRIQUE ANASTACIO ALVES, CPAF-Rondonia; RODRIGO BARROS ROCHA, CPAF-Rondonia; Igor C. A. Lima, UFRJ; Jefferson S. de Gois, UFRJ. |
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Título: |
Evaluation of chemometric methodologies for the classification of Coffea canephora cultivars via FT-NIR spectroscopy and direct sample analysis. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Analytical Methods, v. 9, p. 4255-4260, 2017. |
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Idioma: |
Inglês |
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Conteúdo: |
his work presents a study of chemometric tools for the classification of Coffea canephora (whole beans) cultivars via in situ direct sample analysis using near-infrared spectroscopy (NIR). The sample pretreatment was carried out by washing and sun-drying the coffee beans and then selecting only non-defective coffee beans. A near-infrared reflectance accessory was used for direct sample analysis. The NIR spectra were baseline-aligned, mean centered, and smoothed using Savitzky?Golay polynomial order zero with 15 points window mean centered data, and the first derivative was calculated. The principal component analysis results demonstrated the formation of different clusters that were further related to the presence of lipids, water, caffeine, chlorogenic acids, sugars, proteins, and carbohydrates (based on the plot of loadings versus wavenumber). Partial least squares discriminant analysis (PLS-DA), soft independent modeling of class analogy (SIMCA), self-organizing map (SOM), and support vector machine (SVM) were applied for the classification of different cultivars of coffee. The best results were achieved using SOM that provided 100.0% correct identification of the validation samples, whereas PLS-DA, SIMCA, SVM (3 PCs), and SVM (4 PCs) provided 82.9, 99.6, 82.9, and 99.6%, respectively. The performance of the methodologies was evaluated using the Matthews correlation coefficient, which confirmed that SOM presented the best results for all the classes. |
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Palavras-Chave: |
Café conilon; NIR. |
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Thesaurus NAL: |
near-infrared spectroscopy. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02156naa a2200217 a 4500
001 2087188
005 2018-02-06
008 2017 bl uuuu u00u1 u #d
100 1 $aLUNA, A. S.
245 $aEvaluation of chemometric methodologies for the classification of Coffea canephora cultivars via FT-NIR spectroscopy and direct sample analysis.$h[electronic resource]
260 $c2017
520 $ahis work presents a study of chemometric tools for the classification of Coffea canephora (whole beans) cultivars via in situ direct sample analysis using near-infrared spectroscopy (NIR). The sample pretreatment was carried out by washing and sun-drying the coffee beans and then selecting only non-defective coffee beans. A near-infrared reflectance accessory was used for direct sample analysis. The NIR spectra were baseline-aligned, mean centered, and smoothed using Savitzky?Golay polynomial order zero with 15 points window mean centered data, and the first derivative was calculated. The principal component analysis results demonstrated the formation of different clusters that were further related to the presence of lipids, water, caffeine, chlorogenic acids, sugars, proteins, and carbohydrates (based on the plot of loadings versus wavenumber). Partial least squares discriminant analysis (PLS-DA), soft independent modeling of class analogy (SIMCA), self-organizing map (SOM), and support vector machine (SVM) were applied for the classification of different cultivars of coffee. The best results were achieved using SOM that provided 100.0% correct identification of the validation samples, whereas PLS-DA, SIMCA, SVM (3 PCs), and SVM (4 PCs) provided 82.9, 99.6, 82.9, and 99.6%, respectively. The performance of the methodologies was evaluated using the Matthews correlation coefficient, which confirmed that SOM presented the best results for all the classes.
650 $anear-infrared spectroscopy
653 $aCafé conilon
653 $aNIR
700 1 $aSILVA, A. P. da
700 1 $aALVES, E. A.
700 1 $aROCHA, R. B.
700 1 $aLIMA, I. C. A.
700 1 $aGOIS, J. S. de
773 $tAnalytical Methods$gv. 9, p. 4255-4260, 2017.
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