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Classification of Venezuelan spirituous beverages by means of discriminant analysis and artificial neural networks based on their Zn, Cu and Fe concentrations.
Hernández-Caraballo, Edwin A; Avila-Gómez, Rita M; Capote, Tarcisio; Rivas, Francklin; Pérez, Anna G.
Afiliação
  • Hernández-Caraballo EA; Laboratorio de Espectroscopia Molecular, Facultad de Ciencias, Instituto Venezolano-Andino para la Investigación Quimica, Universidad de los Andes, Mérida, Venezuela. ea_hernandezc@yahoo.com
Talanta ; 60(6): 1259-67, 2003 Aug 29.
Article em En | MEDLINE | ID: mdl-18969153
Copper, zinc and iron concentrations were determined in "aguardiente de Cocuy de Penca" (Cocuy de Penca firewater), a spirituous beverage very popular in the North-Western region of Venezuela, by flame atomic absorption spectrometry (FAAS). These elements were selected for their presence can be traced to the (illegal) manufacturing process of the aforementioned beverages. Linear and quadratic discriminant analysis (QDA), and artificial neural networks (ANNs) trained with the backpropagation algorithm were employed for estimating if such beverages can be distinguished based on the concentrations of these elements in the final product, and whether it is possible to assess the geographic location of the manufacturers (Lara or Falcón states) and the presence or absence of sugar in the end product. A linear discriminant analysis (LDA) performed poorly, overall estimation and prediction rates being 51.7% and 50.0%, respectively. A QDA showed a slightly better overall performance, yet unsatisfactory (estimation: 79.2%, prediction: 72.5%). Various ANNs, comprising a linear function (L) in the input layer, a sigmoid function (S) in the hidden layer(s) and a hyperbolic tangent function (T) in the output layer, were evaluated. Of the networks studied, the (3L:5S:7S:4T) gave the highest estimation (overall: 96.5%) and prediction rates (overall: 97.0%), demonstrating the superb performance of ANNs for classification purposes.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies País/Região como assunto: America do sul / Venezuela Idioma: En Revista: Talanta Ano de publicação: 2003 Tipo de documento: Article País de afiliação: Venezuela País de publicação: Holanda

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies País/Região como assunto: America do sul / Venezuela Idioma: En Revista: Talanta Ano de publicação: 2003 Tipo de documento: Article País de afiliação: Venezuela País de publicação: Holanda