Don't expose them to oxygen. keep the skin on them. if you happen to bite into one or cut one up but want to save the rest for later. use a air tight container and refridgerate them. apples tend to decay once exposed to oxygen. the inside of them that is. <P>If you mean when you take a slice and the rest get dark (inside of the apple). A way to prevent this from happening is to put the apple in a container like a bowl with water and salt.<STRONG> You don't have to use to much salt at all.</STRONG> But this will keep the apple with good flavor and natural appearance inside. READY TO GET EATEN!!!!</P>
A small amount of lemon juice dashed over cut apples will keep them from browning.
Browning is polyphenol oxidase (PPO) react with oxygen which form "Rust" Coating freshly cut apples in sugar can reduce oxygen diffusion and thus slow the browning reaction.
Salt water slows the dehydration (browning of apples) because it is an acid.
If they are sitting out, not in a fridge, I would say about 30 minutes. If they are in the fridge, they have about double that time. To keep your apples from browning you can put lemon juice on them and this will delay the browning process.
Water can slow down the browning of apples by creating a barrier that limits the exposure of the fruit to oxygen, which is necessary for the enzymatic reaction that leads to browning. However, if apples are not kept submerged, they will still be exposed to air, allowing oxidation to occur. Additionally, moisture on the surface may help reduce browning temporarily, but without complete submersion, the apples will eventually brown due to oxygen contact. To minimize browning effectively, it's best to combine water immersion with other methods, such as adding lemon juice or using airtight containers.
Browning of apples is due to the creation of brown pigments through enzymatic polymerization of polyphenolic (normally colorless) apple compounds.
No because no
Salt prevents apples from browning because it inhibits the enzyme responsible for the oxidation process that causes the browning reaction. This enzyme, called polyphenol oxidase, requires oxygen to function, and salt helps block this reaction by reducing the oxygen available.
Certain varieties of apples have more of a tendency than others to turn brown when cut. Some agriculturists have worked on select breeding for a less-browning characteristic. Also, storage apples will brown quicker than fresh apples. Right now, you should be getting fresh apples in the stores.If you are referring to purchased cut apples, there are preparations - like lemon juice and sulfites - that will reduce browning.
Browning of the apples is caused by the oxidation of the enzyme phenol oxidase:phenol oxidase + oxygen---------------melanins
Coating freshly cut apples in sugar or syrup can reduce oxygen diffusion and thus slow the browning reaction. Lemon or pineapple juices, both of which naturally contain antioxidants, can be used to coat apple slices and slow enzymatic browning
Lemon juice is acidic and helps prevent your apples from browning. You can achieve the same thing using lime juice as well as it's not so much about adding flavour as it is about maintaining a nice colour