Chemistry behind colour changes - Enzymatic browning
20 important questions on Chemistry behind colour changes - Enzymatic browning
How does enzymatic browning happen?
How does the process of making tea go?
2. Dry tea leaves at 25-30 C (40-50% moisture loss)
3. Rolling of leaves
4. ‘Fermentation’ at 25 C (not by bacteria but by enzyme so not real ferment.)
- Colour changes
- Flavour formation
6. Packaging
What is the difference between these tea's?
- Higher grades + faster learning
- Never study anything twice
- 100% sure, 100% understanding
For my 1st exam I got a C. Then, I started looking for ways to learn better and I came across Study Smart. Since then I have scored a A+, A, A- and another A. I highly recommend it to everyone who wants to hear it. I am so happy with it!!
I was struggling to finish all my first-year subjects for 3 years. Then I discovered Study Smart, which helped me to finish all of them within 3 months.
Because of StudySmart, things are going well in many ways. Before, I always had study stress and no time for anything. Now I feel calm and confident (because of the program). I used to score a B, now I usually score an A or A+.
Hey Chris, I really want to thank you very much for developing the platform, I usually got around C for my exams, now I scored an A+, an A and a A- !!
Since using Study Smart, my average has increased significantly. I even completed a statistics course with a A+ while I'm bad at statistics. I took on extra courses this year, because of Study Smart. Thanks so much!
Ever since I started studying with StudySmart I passed all my exams !!! No more re-sits!! At first, I was happy with a pass and now I only get good grades. Many thanks!
I aced all the courses I studied with Study Smart. For law, I first scored a D, and now an A! I’m 100% sure that I’ll pass all the courses I study with Study Smart.
I always thought I studied well. My grades were fine. I could never have imagined that applying these study skills would have such a huge and direct impact on my grades, my speed and the pleasure I have in learning.
For the first time, I finally feel totally confident about the way I learn. I have the perfect overview and make great progress in terms of speed and the grades I get. Thanks, Chris!
I immediately started to enjoy learning again, and my grades soared. All of a sudden, everything went better. I highly recommend Study Smart to all students..
Being able to create my materials online made the process of studying so much smoother and quicker. I no longer have to spend a huge amount of my time on creating my summaries.
At first, my notes were a mess. Now I use Study Smart to take my notes in a perfectly structured way. It helps me to save a lot of time and do other things I enjoy.
Students that study with Study Smart get better grades. The system applies all the learning methods in such a way that both well-performing students and students who struggle perform much better.
Hi Chris, I would like to thank you very much. Last year I scored C on a course, and this year I got an A+ thanks to your method! Thank you very much!
The largest effect is that my child is more enthusiastic about school! Every parent wants their children to be happy at school, Study Smart made it happen.
In high school, I failed several exams, and that has really changed now. I actually needed this tool very much back then. Since I started studying with StudySmart, I haven't had any D's. My average score is now an A and those are results I would have never had in the past
With my old method, I passed only 3 out of 8 courses. Since I started taking my notes digitally in Study Smart, I have passed all my courses on the first try. For me, StudySmart takes away the stress of wondering if I will pass or not.
Thanks to StudySmart, I passed all my exams, and with better grades than before! On top of that, I have mastered a very good study method now, which I am confident will help me earn my degree.
What are the 3 enzymes in the enzymatic reaction? Can you fill this sceam in?
The 3 enzymes use the same substrate.
2 use O2, 1 H2O2
2 produce free radicals, 1 not
What is the difference between the cresolase and catecholase enzyme (de 2 PPO)?
De catecholase doet allen osxidation
What is the main difference between Pholy Phenol oxidase met laccase en peroxidase?
What can you do with mass spectrometry?
Is mass spectrometry quantative?
How can mass spectrometry determine the kind of molecules in tea?
What is a van krevelen plot?
Does enzymatic browning only happen in fruites?
When you cook them en leave them they will become brown if the scrimp had before the cooking to long time to ripe.
What is the similarity and difference between scrimp and fruit browning?
Difference is the substrate that is used.
What kind of reactions play a rol in the brown colour formation in shrimps?
What is similar in all the browning reactiosn in enzymes?
What two ways are there to prevent browning in muchrooms?
target other enzymes that do the folow up reachton.
What forms the colour in whine?
After fermentation of the wine there are certain components (acetaldehyde, glyoxylic acid en pyruvic acid) always a acid. That can react with the an thocyanidins. They wil form more stable colour compounds. Most are red some yellow and they will determine the final colour of the wine.
What is the difference between athocyanins and anthocyanidins and what is the difference in properties?
The anthocyanins hebben een sugar unit aan hun molecul vast.
With anthocyanins the suger unit has more (OH) groeps which makes your molecule's more polar and therfore more water soluble.
What can you say about the colour formation and stability of this compound at different pH, found in potatoes and cabbage?
The red is more stable then the blue and the blue will react to the yellow compound.
What are the important factors in colour of anthocyaninds?
- Temprature
- pH
- acylation (improves stability, picture gives acyl groups in blue)
What is a stacking interachtion?
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
