Polyphenol oxidase (PPO) is present in most higher plants, but also in animals and fungi.
PPO in plants had been summarized several years ago. However, recent advances in …

Enzymatic browning is a colour reaction occurring in plants, including cereals, fruit and
horticultural crops, due to oxidation during postharvest processing and storage. This has a …

Polyphenol Oxidases (PPOs) catalyze the conversion of phenolic substrates to quinones,
leading to the formation of dark-colored precipitates in fruits and vegetables. This process …

Plant polyphenol oxidases (PPOs) are ubiquitous copper metalloenzymes with a
biochemistry that has been known for more than a century. By the 1990s, biologists began to …

The flavonoid pathway is one of the best characterized specialized metabolite pathways of
plants. In angiosperms, the flavonoids have varied roles in assisting with tolerance to abiotic …

L-Tyrosine (Tyr) is an aromatic amino acid (AAA) required for protein synthesis in all
organisms, but synthesized de novo only in plants and microorganisms. In plants, Tyr also …

Summary The Persian walnut (Juglans regia L.), a diploid species native to the mountainous
regions of Central Asia, is the major walnut species cultivated for nut production and is one …

The enzyme polyphenol oxidase (PPO) catalyzes the oxidation of phenolic compounds into
highly reactive quinones. Polymerization of PPO-derived quinones causes the postharvest …

Tyrosinases are metalloenzymes belonging to the type‐3 copper protein family which
contain two copper ions in the active site. They are found in various prokaryotes as well as in …

Background Plants are hotbeds for parasites such as arthropod herbivores, which acquire
nutrients and energy from their hosts in order to grow and reproduce. Hence plants are …