The 4-hydroxybenzoylhydrazide method for the determination of carbohydrates should only be carried out in Pyrex or polypropylene tubes. Soda glass gives inconsistent results. Care should also be taken that the pHs of solutions are of similar value.
I. M. Morrison and E. H. Smith, Analyst, 1988, 113, 841 DOI: 10.1039/AN9881300841
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