Polyphenol Oxidase Enzyme and Inactivation Methods


  • Leman Yılmaz Ege Üniversitesi, Mühendislik Fakültesi, Gıda Mühendisliği Bölümü, 35100 Bornova/İzmir
  • Yeşim Elmacı Ege Üniversitesi, Mühendislik Fakültesi, Gıda Mühendisliği Bölümü, 35100 Bornova/İzmir




Enzymatic browning, Fruits, Vegetables, Chemical agents, Antibrowning applications


Polyphenol oxidase enzyme is found in vegetables and fruits, as well as in some animal organs and microorganisms. Polyphenol oxidase enzyme responsible for enzymatic browning is a group of copper proteins that catalyses the oxidation of phenolic compounds to quinones, which produce brown pigments, commonly found in fruits and vegetables. During the industrial preparation of fruits and vegetables, results of catalytic effect of polyphenol oxidase causes enzymatic browning. Enzymatic browning impairs the appearance of products containing phenolic compounds along with undesirable colour, odor and taste formation and significant loss of nutritional value of the products. This affects the acceptability of the products by the consumers and causes economic losses. In this review, some characteristics of polyphenol oxidase enzyme in different fruits and vegetables have been reviewed and information about chemical antibrowning agents, thermal applications, irradiation applications and alternative methods such as high pressure processing, pulse electric field, supercritical carbon dioxide and ultrasound applications to inactivate this enzyme has been presented.



How to Cite

Yılmaz, L., & Elmacı, Y. (2018). Polyphenol Oxidase Enzyme and Inactivation Methods. Turkish Journal of Agriculture - Food Science and Technology, 6(3), 333–345. https://doi.org/10.24925/turjaf.v6i3.333-345.1727



Food Technologies