Ph com - control sdn ingibt enz. oxid

4 important questions on Ph com - control sdn ingibt enz. oxid

How inhibit brown

- elmination of o2
- reduction of pH
- heat denaturaiton of enzyme (PPO)
- quite heat stable
stability deppens on the plant material

Chelating agents and ascorbic acid

chelating agenst
Bind metal ions
so can bind CU2+ of PPO  and extract
citric acid 

ascorbic acid
reducton of quinon to phenolic compound

Enzymatc vs non-enzymatic Maillard? Browning

- O2 consumption - enzym uses
- dimish effect of PPO ad ascorbi acid and/or sulphite - inhib enzyme
- addition of chelating agent - inactive enzyme
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Inac enzyme with sulphur

Importance of histidine and Cu2+
addi oxid

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