What are the chemicals involved in enzymatic browning of apples, and especially apple juice?

I am doing my IB extended essay on enzymatic browning of apples. my research question is to investigate how pH affects the browning process.

Similar Asks:

  • How does Browning close his poem ‘The Pied Piper of Hamlin’? - I am currently doing an essay on ‘The Pied Piper of Hamlin’, by Browning and i am writing about the ways in which Browning ends the poem. However since its such an open question i don’t know where to start. Any help would be much appreciated. User tags:intext:??????? ?? ???????? intext:???????? ??????????? ????
  • Im currently writing an extended essay in ib in english a1 and need some help!? - i started writing my extended essay in english about the harry potter series. its due anytime next month but i really need tips on a good thesis and question to investigate…i have about 700 words till now but thats just introducing a the topic…i really neeed ur help guyz any help wil be really appreaciated. User
  • Research Question ideas for DNA/Genetics? - I have to right an extended essay (4,500 words) on a subject of my choice, and I want to do something on DNA/genetics. The research question needs to lead to an experiment, and I’ve been researching gel electrophoresis. All I need help with is a research question, that’s do-able for a slightly advanced high school
  • Extended Essay Chemistry HELP!? - I need help with my choice of topic for extended essay chemistry. I am interested in the topic of wine (organic chemistry/ acid-base) and more specifically in the ph of the different wines. However I am having a hard time coming up with a research question for this topic. It would be great help if
  • Question for extended essay (IB) on the subject psychology regarding memory repression? - I am doing an EE (extended essay) on the subject psychology. My topic is memory. My research I question is Can painful memories be repressed and later recalled? BUT this is too broad! Please if you done the EE before help me to change my question and make more precise? It needs to answer the
  • Dramatic monologue in John Donne and Robert Browning? - Can anyone help me with this question? I need to write a short essay (about a page) on discussing the use of dramatic monologue in John Donne and Robert Browning. is there a website that could help me with this? Can someone just simply explain it? Either would be very helpful. User tags:intext:???????
  • International Baccalaureate? - This might just be a panic attack but I can’t write my extended essay. I hadn’t even started writing it until tonight. But that’s not even the worst part. The worst pat is that I have no idea what to write. My research question is “How did Nazi propaganda in Germany versus abroad differ in

Both comments and pings are currently closed.

2 Responses to “What are the chemicals involved in enzymatic browning of apples, and especially apple juice?”

  1. lawine says:

    “The browning reaction results from the oxidation of phenolic compounds in the fruit under the action of an enzyme called polyphenol oxidase (PPO), which is common in plant tissues. Once you cut the fruit, you open up some of the cells. The enzyme then has access to oxygen in the air and it does its thing, turning the fruit brown. This is the same thing that causes brown spots in apples when you drop them.The easiest way to prevent browning is to put the sliced apples in water so that the enzyme does not have access to oxygen. You can also heat the apples to denature the enzyme.”

  2. upboulevard says:

    This is just my topic! :) The browning is between phenolic compounds and an enzyme callled polyphenoloxidase or PPO enzyme as it is known in the food industry. pH alone will not mitigate browning, you need to use a reducing agent like Ascorbic acid or Sulfur Dioxide.I worked with one of the world’s leading authorities on this 25 years ago at Oregon State University, in Corvallis, Oregon.His name is Dr. Morris Montgomery. You can get a lot of information his work, by calling the Department of Food Science and Technology, Oregon State University, Corvallis, Oregon. I would recommend speaking to Dr. Scanlan, as he is one of the old timers around who can give you info on Dr. Montgomery’s work.You might also want to call some apple processors, like TreeTop in Selah, Washington, tell them that you are working on a school paper and would their R’D department help you out? Hope this gives you some leads.PS – Check the Journey of Food Science and Technology, at the Institute of Food Technologists on line, [external link] , Oregon State University is on line, and the food science department has a good website :) Good luck