Automatic determination of fat in milk by use of a flow injection system with a piezoelectric detector

  1. Manganiello, Lisbeth . 2
  2. Ríos, A. 2
  3. Valcárcel, M. 2
  4. Ligero, A. 2
  5. Tena, T. 1
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

  2. 2 Universidad de Córdoba (Colombia)
    info

    Universidad de Córdoba (Colombia)

    Montería, Colombia

    ROR https://ror.org/04nmbd607

Revista:
Analytica Chimica Acta

ISSN: 0003-2670

Año de publicación: 2000

Volumen: 406

Número: 2

Páginas: 309-315

Tipo: Artículo

DOI: 10.1016/S0003-2670(99)00775-8 SCOPUS: 2-s2.0-0343550571 WoS: WOS:000085290600018 GOOGLE SCHOLAR

Otras publicaciones en: Analytica Chimica Acta

Repositorio institucional: lock_openAcceso abierto Editor

Resumen

A new method for the direct determination of total fat in milk by use of a quartz crystal microbalance was developed. The method is based on a (micro) extraction procedure that is carried out in a flow injection system. Samples are diluted with an ethanol-water mixture and injected into the flow system, where they are mixed with n-hexane in an extraction coil. The analyte is determined in the organic phase. The calibration thus achieved is linear in the range 0.20-0.45% w/v, and the relative standard deviation is ±3.2% (n=11; P=0.05). The throughput is 12 samples per hour. The proposed method was used to determine fat matter in milk samples; the results were found to be competitive with those of official methods for the same purpose. Copyright (C) 2000 Elsevier Science B.V.