Potato Research

, Volume 42, Issue 1, pp 89–93 | Cite as

Residues of free and bound maleic hydrazide in potato tubers

  • A. I. Dias
  • H. J. Duncan
Full Papers


The method of Vadukul (1991) for determining maleic hydrazide (MH) was modified and gave recoveries of free MH of 89%±4%. The values recorded on individual tubers ranged from 2–14 mg kg−1. Maleic hydrazide was evenly distributed throughout the tuber (peel, outer and inner flesh) but concentration increased slightly as tuber size increased. The concentration of free MH decreased from 7 to 3 mg kg−1 over the storage period of 5 1/2 months. Acid hydrolysis released substantial amounts of MH particularly from older potatoes (13 mg kg−1) compared with 6 mg kg−1 from new potatoes, implying that free MH is gradually converted to a bound form with time after treatment. No evidence was found for the presence of a β-glucoside of MH.

Additional keywords

analysis HPLC β-glucoside 1,2-dihydro-3,6-pyridazinedione Solanum tuberosum L. 


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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • A. I. Dias
    • 1
  • H. J. Duncan
    • 2
  1. 1.Horticulture Research and Development InstitutePeradeniyaSri Lanka
  2. 2.Agricultural, Food and Environmental Chemistry, Department of ChemistryUniversity of GlasgowGlasgowUK

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