Tea chemistry Tea chemistry

Barbora KlanicováBarbora Klanicová Tomáš FójcikTomáš Fójcik

Some facts about teaSome facts about tea

The plant is called The plant is called

Camellia sinensisCamellia sinensis Is grown in 30 countries Is grown in 30 countries

and consumed and consumed worldwideworldwide

3 basic forms : green tea3 basic forms : green tea

black teablack tea oolong oolong

Cultivation of teaCultivation of tea

Normal height about 1 metreNormal height about 1 metre Tea requires Tea requires ▪▪ abundant rainfall and sunshine abundant rainfall and sunshine ▪▪ acid soilacid soil ▪ ▪ high altitude from sea level to about high altitude from sea level to about

2000 m 2000 m

Tea manufactureTea manufacture

Processing - Processing - cut, tear cut, tear and curland curl

Fermentation - Fermentation - process process of oxidationof oxidation

Drying - Drying - to arrest to arrest fermentationfermentation

Sorting - Sorting - cleaning and cleaning and grading over grading over electrostatic electrostatic fibre fibre extractorsextractors

Packing -Packing - into paper into paper sacks sacks for exportfor export

Tea chemistryTea chemistry

CaffeinCaffein Chlorophyll Chlorophyll

Tea contains Mn, Zn, K, Mg and no carbohydrates or fatsTea contains Mn, Zn, K, Mg and no carbohydrates or fats Is rich in fluoride (green tea twice more than black tea)Is rich in fluoride (green tea twice more than black tea) Caffein Caffein ▪ soluble in boiling water▪ soluble in boiling water

▪ one cup 40 mg ( less than half in a cup of coffee) ▪ one cup 40 mg ( less than half in a cup of coffee) Chlorophyll ▪ undergoes biological decompositionChlorophyll ▪ undergoes biological decomposition

▪ ▪ same sort of parent structure as hemoglobin same sort of parent structure as hemoglobin (Fe x Mg)(Fe x Mg)

Tea chemistryTea chemistry

Polyphenols Polyphenols ▪ carbon, oxygen, hydrogen▪ carbon, oxygen, hydrogen ▪ dull weather-lower concentration ▪ dull weather-lower concentration

When tea leaves are ruptured during rolling, the When tea leaves are ruptured during rolling, the polyphenols and oxidase mix and oxidation starts polyphenols and oxidase mix and oxidation starts if oxygen is present. if oxygen is present.

Tea and healthTea and healthScientific Research on Black Tea has revealed thatScientific Research on Black Tea has revealed that • • It enhances muscle performanceIt enhances muscle performance

• It reduces gastric ulcer • It reduces gastric ulcer • It reduces the blood sugar level in diabetes• It reduces the blood sugar level in diabetes• It modulates blood cholesterol• It modulates blood cholesterol• Prevention of dental caries by tea or tea polyphenols• Prevention of dental caries by tea or tea polyphenols• Tea plant root extract has anti-tumor activity• Tea plant root extract has anti-tumor activity• Antioxidant potential of tea • Antioxidant potential of tea • Tea polyphenols decrease the mutagenicity of carcinogens • Tea polyphenols decrease the mutagenicity of carcinogens

VocabularyVocabulary

abundant rainfall – vydatný déšťabundant rainfall – vydatný déšť

high altitude – nadmořská výškahigh altitude – nadmořská výška

grading – tříděnígrading – třídění

soluble in boiling water – rozpustnýsoluble in boiling water – rozpustný

enhance – zvyšovatenhance – zvyšovat

gastric ulcer – žaludeční vředgastric ulcer – žaludeční vřed

dental caries – zubní kazdental caries – zubní kaz

Thnx 4 your attentionThnx 4 your attention