Abstract
Chlorogenic acid (CQA) is one of the major polyphenols in apple and a good substrate for the polyphenol oxidase (PPO) in apple. Apple contains catechins as well as CQA, and the role of CQA quinone and its interaction with catechins in the enzymatic browning of apple were examined. Browning was repressed and 2-cysteinyl-CQA was formed when cysteine was added to apple juice. CQA quinone was essential for browning to occur. Although catechins and CQA were oxidized by PPO, some catechins seemed to be non-enzymatically oxidized by CQA quinone.
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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Cysteine addition repressed browning in apple juice.
- Taxon
- apple
Malus domesticae0 - Treatment
- cysteinee0
- Outcome
- Browninge0
- Direction
- repressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Browning was repressed and 2-cysteinyl-CQA was formed when cysteine was added to apple juice”
Claim · model-written summary
Cysteine addition formed 2-cysteinyl-CQA in apple juice.
- Taxon
- appleMalus domesticae0
- Treatment
- cysteinee0
- Outcome
- 2-cysteinyl-CQA was formede0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Browning was repressed and 2-cysteinyl-CQA was formed when cysteine was added to apple juice”
Claim · model-written summary
CQA quinone was essential for apple browning.
- Taxon
- AppleMalus domesticat0
- Compound
- CQA quinonee0
- Outcome
- browninge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CQA quinone was essential for browning to occur”
t0“Apple”
Claim · model-written summary
Catechins and CQA were oxidized by apple PPO.
- Taxon
- AppleMalus domesticat0
- Gene
- PPOe0
- Outcome
- catechins and CQA were oxidized by PPOe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“catechins and CQA were oxidized by PPO”
t0“Apple”
Claim · model-written summary
Some apple catechins appeared to be oxidized nonenzymatically by CQA quinone.
- Taxon
- AppleMalus domesticat0
- Compound
- CQA quinonee0
- Outcome
- some catechins seemed to be non-enzymatically oxidizede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some catechins seemed to be non-enzymatically oxidized by CQA quinone”
t0“Apple”
The same questions in other papers
cysteine · disease · Malus domestica (apple)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.