Sustained release of cytokinins from natural polymers

Shmuel Bittner, Israel Perry, Yehuda Knobler

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The cytokinins 6-benzylaminopurine, 6-furfurylaminopurine and 6-(3-methyl-2-butenylamino) purine, were attached to starch and to cellulose by means of a carbamatic bond. The modified polysaccharides contained about one cytokinin molecule per 50 glucose units. The rate of release of the cytokinins was followed spectrophotometrically in aqueous solutions at different pHs. A good agreement with a first order model was found and the kinetic constants for the various systems were determined. The clear dependence on the pH of the medium supports a mechanism in which hydrolysis of the carbamatic bond is the rate determining step. The hormonal activity of the modified polymers was determined in the soybean callus bioassay and compared with the activities of non-bonded cytokinins. While high concentrations of free hormones cause inhibition of growth, such concentrations of bound hormone did not show inhibition.

Original languageEnglish
Pages (from-to)305-307
Number of pages3
Issue number3
StatePublished - 1 Jan 1977


  • 6-(4-methyl-3-pentyl-aminopurine)
  • 6-benzyl-amino purine
  • 6-furfurylaminopurine
  • Controlled release
  • cellulose
  • cytokinins
  • kinetic of release.
  • plant hormones
  • polysaccharides
  • starch
  • synthesis

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Plant Science
  • Horticulture


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