Editing Melanin (section)

=== Plants ===
[[File:Indol-5,6-chinon.svg|thumb|Chemical structure of indole-5,6-quinone]]
Melanin produced by plants are sometimes referred to as 'catechol melanins' as they can yield [[catechol]] on alkali fusion. It is commonly seen in the [[enzymatic browning]] of fruits such as bananas. Chestnut shell melanin can be used as an antioxidant and coloring agent.<ref>{{Cite journal |last1=Yao |first1=Zeng-Yu |last2=Qi |first2=Jian-Hua |date=22 April 2016 |title=Comparison of Antioxidant Activities of Melanin Fractions from Chestnut Shell |journal=Molecules |volume=21 |issue=4 |pages=487 |doi=10.3390/molecules21040487 |pmc=6273334 |pmid=27110763 |doi-access=free}}</ref> Biosynthesis involves the oxidation of [[indole-5,6-quinone]] by the tyrosinase type [[polyphenol oxidase]] from [[tyrosine]] and [[catecholamines]] leading to the formation of catechol melanin. Despite this many plants contain compounds which inhibit the production of melanins.<ref>{{Cite journal |last1=Kim |first1=Y.-J. |last2=Uyama |first2=H. |date=15 May 2005 |title=Tyrosinase inhibitors from natural and synthetic sources: structure, inhibition mechanism and perspective for the future |journal=Cellular and Molecular Life Sciences |volume=62 |issue=15 |pages=1707–1723 |doi=10.1007/s00018-005-5054-y |pmc=11139184 |pmid=15968468 |s2cid=8280251}}</ref>