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2. Manufacturing processes for the main types of tea
2.1 Different types of tea
The different types of tea obtained according to the manufacturing stages are shown in figure 3 :
white tea: this tea contains only the bud or first leaf, and undergoes the least post-harvest processing. The buds are often covered by down, which gives the tea its white color. The transformation process is very simple: the leaves are placed in the shade for the withering stage, then dried;
green tea: to prevent fermentation, the leaves are brought to a high temperature (either dry heat, i.e. stirred in a large wok over a fire, or moist heat, i.e. placed over steam baths, the...
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Manufacturing processes for the main types of tea
Biochemical transformations and nutrition
Bibliography
- (1) - GRIGG (D.) - The worlds of tea and coffee: patterns of consumption. - GeoJournal, 57(4), p. 283-294 (2002) https://doi.org/10.1023/B:GEJO.0000007249.91153.c3
- (2) -...
Websites
Special volume of the journal Food Research International on tea: Tea – from bushes to mugs: composition, stability and health aspects edited by Anderson de Souza Sant'Ana. Volume 53, Issue 2, Pages 557-950 (October 2013) https://www.sciencedirect.com/journal/food-research-international/vol/53/issue/2
...Standards and norms
Methods for controlling tea quality have been developed and many are standardized in ISO standards. Thirty standards have been published and grouped together in ISO/TC 34/SC 8, the most important of which are :
- Black tea – Definition and basic requirements - ISO 3720 - 2011
- Green tea – Definition and basic requirements - ISO 11287 - 2011
- White tea – Definition - ISO/TR 12591 - 2013 ...
Regulations
For toxicology, Regulation (EC) no. 396/2005 applies, concerning maximum residue levels of pesticides in or on food and feed of plant and animal origin. For mycotoxins, there is no regulation concerning plain tea, but for the categories of flavored tea and tea or flavored tea containing other food ingredients, regulation (EC) no. 1881/2006 setting maximum levels for certain contaminants in foodstuffs applies.
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