Abstract Preview

The method consists in extraction by shaking with dimethylformamide, then after centrifuging, addition of ferric ammonium citrate and ammonia to an aliqiot part of the supernatant liquid and spectrometric determination, at 525 nm, of the absorbance of the solution thus obtained, and determing of the tannic content using a calibration curve prepared using tannic acid.


General information

  • Status :  Published
    Publication date : 1988-12
  • Edition : 1
    Number of pages : 3
  • :
    ISO/TC 34/SC 4
    Cereals and pulses
  • 67.060
    Cereals, pulses and derived products

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Life cycle

A standard is reviewed every 5 years



Revisions / Corrigenda

  • Now under review
    ISO 9648:1988
  • Will be replaced by
    ISO/CD 9648

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