FOOD SCIENCE ›› 2010, Vol. 31 ›› Issue (14): 225-228.doi: 10.7506/spkx1002-6630-201014051

• Analysis & Detection • Previous Articles     Next Articles

Determination of Sulfur Dioxide in Preserved Fruits Using Auto-Kjeldahl s Apparatus Combined with Automatic Potentiometric Titrator

XIE Yan-yun，ZHANG Ming-ming，DENG Ying-yan，SUN Yuan-ming，LIU Chun-hong*   

  1. Key Laboratory of Food Safety of Guangdong Province, College of Food Science, South China Agricultural University,
    Guangzhou 510642, China
  • Received:2009-12-03 Revised:2010-04-13 Online:2010-07-15 Published:2010-12-29
  • Contact: LIU Chun-hong* E-mail:liuch@scau.edu.cn

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Abstract:

A method using FOSS 2200 auto-Kjeldahl s apparatus coupled with Metrohm 809 automatic potentiometric titrator was developed to determine sulfur dioxide in preserved fruits. This method is simple, rapid and accurate and the whole process only needs 6 minutes. No significant difference (P ＞ 0.05) between determination results obtained using Kjeldahl s apparatus and glass distiller for distillation was observed. The relative error of this method was lower than 0.94%. Average spike recovery rates for sulfur dioxide in 5 preserved fruits were between 90.39% and 103.40%, and the detection limit was 2.6 mg/kg. Therefore, this method is most suitable for determining sulfur dioxide in solid and liquid food samples.

Key words: sulfur dioxide, auto-Kjeldahl s apparatus, automatic potentiometric titrator, glass distiller

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