An automatic shaking device was made for improving color development in glycoalkaloid determination. The device comprises two basic parts. The stationary part includes two kinds of special constant volume burettes which were calibrated to deliver 5 ml of concentrated sulfuric acid in exactly 3 min and 2.5 ml of, 1% formaldehyde in exactly 2 min. The moving part consists of 12 reaction tubes mounted on a rocker plate which was coupled to a shaker with a connecting rod. Optimum speed of shaking was 4/set. The device worked six times faster than that by conventional manual operation.
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Wu et al. (1976) studied this question.
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