Occurrence and distribution of lipoxygenase inCamellia sinensis (L) O Kuntze and their changes during CTC black tea manufacture under southern Indian conditions
✍ Scribed by Ravichandran, Ramaswamy; Parthiban, Ramaswamy
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 212 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
The optimal activity of tea lipoxygenase was found to be at pH 7É5 and 9É0, indicating the presence of two types of isoenzymes. Tea lipoxygenase was inhibited by cyanide and a small fraction appeared to be quite heat stable. Clonal and seasonal variations in lipoxygenase activity was signiÐcant. An increase in lipoxygenase activity was observed with leaf maturity. The lipoxygenase activity decreases with age from pruning and increases with an increase in plucking interval. The changes of lipoxygenase activity during CTC manufacture revealed that it increased with the degree of withering and upon rolling. However, a gradual decline was recorded during the fermentation and drying processes. The residual lipoxygenase activity in black tea is expected to a †ect its quality on storage.