Abstract
Abstract Further collaborative studies were made of the gradient elution and paper chromatographic methods for organic acids in vanilla extract, both adopted as official, first action in 1962. The gradient elution method was studied by six collaborators on three samples. All six detected the presence of added foreign acid. The paper chromatographic method was studied by 16 collaborators on four unknown samples and one reference standard vanilla. Results were very good. It is recommended that both methods be made official, final action.
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