Abstract
Acetaldehyde was shown to be the impurity in a sample of commercial acetic acid responsible for shifting λ max in the resorcinol test for fructose from 480 to 555 mμ. The effect of acetaldehyde, purified acetic acid, and purified ethanol on several resorcinol procedures was determined. It was shown that maximum absorbance at 555 mμ was obtained when equimolar amounts of fructose and acetaldehyde were present in the test mixture and that Beer's law held for the determination of fructose at 555 mμ as long as the acetaldehyde concentration was equal to or exceeded that of fructose. The effect of acetaldehyde on resorcinol procedures decreased while the effect of purified ethanol and purified acetic acid increased as the hydrochloric acid concentration in the test was lowered from 9 to 6 N. Acetic acid was always more effective than ethanol in increasing the sensitivity of the test.
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