VIEW ARTICLE    DOI: 10.1094/ASBCJ-38-0146

Residual Sulfur Dioxide in Finished Malt: Colorimetric Determination and Relation to N-Nitrosodimethylamine. B. Lukes and T. J. O'Brien, Great Western Malting Co., Vancouver, W A 98668, and R. A. Scanlan, Department of Food Science, Oregon State University, Corvallis 97331. J. Am. Soc. Brew. Chem. 38:0146, 1980.

Residual SO₂ concentrations in production malts from direct-fire, fossil fuel kilns in which SO₂ was applied to control N-nitrosodimethylamine (NDMA) formation were determined by a modified colorimetric procedure and correlated to malt NDMA content from analysis by gas chromatography-thermal energy analysis. Malt samples containing residual SO₂ greater than 30 mg/kg had less than 10 µg/kg of NDMA. Samples with SO₂ residual less than 30 mg/kg were correlated to NDMA levels. Determination of residual SO₂ values can therefore be used as a rapid screening procedure to detect production malts that may contain NDMA in excess of 10 µg/kg.

Keywords: Analysis, Correlation, Malt, Nitrosamine, Sulfur dioxide