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Authenticity of freeze-dried açai pulp by near-infrared spectroscopy

Lobato, Kleidson Brito de Sousa ; Alamar, Priscila Domingues ; Caramês, Elem Tamirys dos Santos ; Pallone, Juliana Azevedo Lima

Journal of food engineering, 2018-05, Vol.224, p.105-111 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Authenticity of freeze-dried açai pulp by near-infrared spectroscopy
  • Autor: Lobato, Kleidson Brito de Sousa ; Alamar, Priscila Domingues ; Caramês, Elem Tamirys dos Santos ; Pallone, Juliana Azevedo Lima
  • Assuntos: Açai ; Chemometrics ; Classification methods ; Fraud ; NIR spectroscopy
  • É parte de: Journal of food engineering, 2018-05, Vol.224, p.105-111
  • Descrição: Açai pulp suffers adulteration by the addition of less expensive materials with the objective to increase yield and consequently the profit margin. Near-infrared spectroscopy has been used in the present work to detect adulteration of freeze-dried açai pulp samples. Adulterants used included cornstarch, beet pulp, grape juice, cassava starch, and maltodextrin. Adulteration was carried out on individual pulp samples at levels of 1, 5, 10, 25 and 50% w/w (wet basis). Spectral data were compressed by principal component analysis and analyzed using K-nearest neighbor (K-NN), Soft independent method of class analogy (SIMCA) and Partial least squares discriminant analysis (PLS-DA). The PCA chart control of Qresidual and the K-NN models confirmed that it is possible to distinguish authentic from adulterated samples and to predict the type of adulterant present in a sample with 100% of correct classification. This study demonstrates that near-infrared spectroscopy is a rapid screening technique for detection of adulterants in freeze-dried açai pulp. [Display omitted] •NIR as a tool to assess the authenticity of freeze-dried açai pulp.•NIR spectra of authentic and adulterated samples were collected.•Multivariate control chart and classification models were developed.•It is possible to distinguish samples with small levels of adulterants (1%).•The authenticity of freeze-dried açai pulp can be assessed by NIR.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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