標準號：ISO 9648-1988
中文標準名稱：高粱 單寧含量的測定
英文標準名稱：Sorghum; determination of tannin content
標準類型：B20
發布日期：1999/12/31 12:00:00
實施日期：1988/12/15 12:00:00
中國標準分類號：B20
國際標準分類號：67.060
適用范圍：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.