ADIOGLU A. & YAVRU I. 1998. Changes in the chemical content and polyphenol
oxidase activity during development and ripening of cherry laurel. - Phyton (Horn,
Austria) 37 (2): 241-251, with 6 figures. - English with German summary.
Changes in the activity of polyphenol oxidase (PPO) and in the levels of soluble
sugars, soluble protein, total phenolic substances and ascorbic acid during the development
and ripening of cherry laurel fruits were investigated. PPO activity and
the other chemical constituents in the fruits harvested every week from the beginning
of June to the mid July were spectrophotometrically analysed. PPO activity and
phenolic content gradually increased during the development of the fruits, but decreased
in the stage of ripening. Soluble sugar and soluble protein levels gradually
increased, while the level of ascorbic acid decreased during fruit development and
ripening. Polyacrylamide gel electrophoresis revealed quantitative changes in two
PPO bands in the fruits