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What is the chemical equation for apples turning brown from polyphenol oxidase?
Wiki User
∙ 10y ago
There is a chemical called polyphenol oxidase present in fruits, vegetables and most living things. It reacts with oxygen in the air to form dioxobenzene.
Polyphenol oxidase + oxygen → dioxobenzene + water
C6H4(OH)2 + O2 → C6H4O2 + H2O
The dioxobenzene is brown.
Both polyphenol oxidase and dioxobenzene are built on a ring of 6 carbons with alternating double bonds ( a benzene ring). The basic carbon ring does not change, but the OH- groups are changed out for O- groups.
Wiki User
∙ 6y ago
Wiki User
∙ 13y agoThe chemical equation for apples turning brown is that apples and other produce such as Pears, bananas, peaches and potatoes contain an enzyme called polyphenol oxidase or tyrosinase that reacts with oxygen and iron-containing phenols that are also found in an apple. The oxidation reaction basically forms a sort of rust on the surface of the fruit when the fruit is cut or bruised because these actions damage the cells in the fruit, allowing oxygen in the air to react with the enzyme and other chemicals.
I hope this helped you answer your question.
By Kayleigh Knight xxx
Wiki User
∙ 10y agoNOBODY KNOWS! they know the reaction but I have been trying to find for the past hour the equation!
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Is digesting a banana a chemical change?
I suppose so, it would be more correct to say it was due to a cellular change. Enzymes present in fruits, mainly polyphenol oxidase cause the browning in damaged fruit. Normally polyphenol oxidase works in plants as a defense against insects. When activated this enzyme turns phenols in the plant into quinones, these quinones then turn into melanins which have beneficial properties to the plant as an antibacterial, anti-fungal, and UV protection. Melanins are dark in color and so make the areas where they are present appear brown.In healthy plant tissue the phenolic compounds are stored in the vacuole of the cell, well separated from the polyphenol oxidase enzyme so no activity happens. However, when a banana is bruised by dropping onto a hard surface or simply overripening, the cells become damaged, the separating membranes are ruptured and polyphenol oxidase can access the phenolic compounds and start the process of turning them into quinones and then into melanins, making brown and black spots in the damaged areas.
What is the chemical equation for turning carbon dioxide into oxygen and carbon?
The equation is:2 CO2 ===========> 2 CO + O2
What is a balanced word equation for the reaction of cucumbers turning into pickles?
A chemical reaction for this process doesn't exist.
Is turning cloudy a chemical change?
A solution turning cloudy is evidence of a chemical change.
Is turning litmus paper red from blue a chemical change?
yes. it is a chemical reaction
Is digesting a banana a chemical change?
I suppose so, it would be more correct to say it was due to a cellular change. Enzymes present in fruits, mainly polyphenol oxidase cause the browning in damaged fruit. Normally polyphenol oxidase works in plants as a defense against insects. When activated this enzyme turns phenols in the plant into quinones, these quinones then turn into melanins which have beneficial properties to the plant as an antibacterial, anti-fungal, and UV protection. Melanins are dark in color and so make the areas where they are present appear brown.In healthy plant tissue the phenolic compounds are stored in the vacuole of the cell, well separated from the polyphenol oxidase enzyme so no activity happens. However, when a banana is bruised by dropping onto a hard surface or simply overripening, the cells become damaged, the separating membranes are ruptured and polyphenol oxidase can access the phenolic compounds and start the process of turning them into quinones and then into melanins, making brown and black spots in the damaged areas.
What is the chemical equation for turning carbon dioxide into oxygen and carbon?
The equation is:2 CO2 ===========> 2 CO + O2
What is a balanced word equation for the reaction of cucumbers turning into pickles?
A chemical reaction for this process doesn't exist.
How do you keep pears from turning brown?
because of polyphenol oxidase which reacts on pear for sometime.Polyphenol oxidase (PPO) enzymes, also known as polyphenoloxidases, are able to catalyze the transformation of an array of aromatic compounds that have two adjacent phenolic groups on them. This includes a number of polyphenols in plants that act as antioxidants. These copper-containing enzymes oxidize the phenolic groups to reactive oxygen molecules known as quinones, which continue reacting with each other and other cellular factors to form brown spots known as melanin. This browning causes the deterioration of fruits and vegetables, resulting in large economic losses. Examples include the pearEnzymatic browningis not unique to pear. PPO - a mixture of monophenol oxidase and catechol oxidase enzymes - is present in nearly all plant tissues, and can also be found in bacteria, animals, and fungi. In fact, browning by PPO is not always an undesirable reaction; the familiar brown color of tea, coffee and cocoa is developed by PPO enzymatic browning during product processing.Tentoxin has also been used in recent research to eliminate the polyphenol oxidase activity from seedlings of higher plants. Enzymatic browning is not unique to apples. PPO - a mixture of monophenol oxidase and catechol oxidase enzymes - is present in nearly all plant tissues, and can also be found in bacteria, animals, and fungi.
Is milk turning sour a physical or chemical change?
Milk turning sour is a chemical change.
Is turning cloudy a chemical change?
A solution turning cloudy is evidence of a chemical change.
What is an Airy equation?
An Airy equation is an equation in mathematics, the simplest second-order linear differential equation with a turning point.
What makes apples go brown?
Oxidation causes apples to turn brown. The browning you see is a result of the polyphenol oxidase (PPO) enzymes oxidizing.
Is bannan turning rotten a chemical or physical change?
This is a chemical change.
What is a flower petal turning brown a physical or chemical change?
Chemical
Is krypton gas turning into plasma a chemical change?
Yes, it is a chemical change.
Is a copper penny turning dark a chemical change or physical change?
Chemical.
