The Chemistry of Green Tea

What is Green Tea?

Green tea is a tea made from the plant Camellia sinensis, the plant is dried right after being harvested as to create minimal oxidation.

What is it made of? Does it have a food label?

The Tea is made of Camellia Sinensis, usually if any label is used it will just say green tea.

What chemicals are in it?

A variety of Catechins, EGCG, Theogallin, chlorogenic acid, Coumaroylquinic Acid, Caffeine, vitamins B and C.

Chemical reactions?

antioxidant reactions occur when steeped.

The composition of  green tea

According to, “To evaluate the potential benefits and risks associated with tea consumption it is important to identify the constituents of this beverage. Levels of some minerals, caffeine and catechins in green tea samples commercialized in Portugal were evaluated. Potassium is the metal present in larger amount (92-151 mg/l). The content of sodium, calcium, fluoride, aluminium, manganese and iron were 35-69, 1.9-3.5, 0.80-2.0, 1.0-2.2, 0.52-1.9, 0.020-0.128 mg/l, respectively. Chromium and selenium were not detected. The resulting data showed considerable variability in catechins content. The levels of epigallocatechin gallate (EGCG) ranged from 117 to 442 mg/l, epicatechin 3-gallate (EGC) from 203 to 471 mg/l, epigallocatechin (ECG) from 16.9 to 150 mg/l, epicatechin (EC) from 25 to 81 mg/l and catechin (C) from 9.03 to 115 mg/l. Caffeine contents in the green tea infusions studied were between 141-338 mg/l. Green tea infusions provide significant amounts of catechins and could be an important source of some minerals.”

Main Chemical Component

Catechin, C15H14O6

Epigallocatechin gallate, C22H18O11

Main components

What are Catechins: Catechins are made up of Carbon, Hydrogen and oxygen they are also called antioxidants.

What is Epigallocatechin gallate: It is another antioxidant that is used for it’s effect in human health and disease.

How is Catechins useful : Catechins are able to help your body reduce the amount of malondialdehyde and thiobarbituric acid-reactive substances in the blood. The acids in the blood help with the storage of fat through the body. The use of Catechins is to lower the amounts of the acid and make it so that your body doesn’t gain weight more so.

How is Epigallocatechin gallate useful: It improves the cognitive function of your brain, by circulating the blood to the brain at a faster rate. The amount of dosage majorly affects the outcome with this chemical as if you have a lot in comparison to a mouse you may become extremely energetic as the chemical just passes through the blood wall.

Why does Catechins help with weight: It is able to help with weight by working in coalition with caffeine which acts to speed the metabolic rate of your body.

Why does Epigallocatechin gallate help you think: The increased blood flow to the brain brings with it stimuli to the brain and its receptors causing the brain to take in what is happening with full cognitive sense.

Resources and Research



Alban, Dean. “ EGCG and Green Tea: Boost Your Brain Health and Function.”Be Brain Fit. Web. 20 April 2016.

T, Nagao. Y, Komin. S, Sog. S, Meguro. T, Hase. Y, Tanaka. I, Tokimitsu. “Ingestion of a tea rich in catechins leads to a reduction in body fat and malondialdehyde-modified LDL in men.” ncbi. Web. April 2016.

M, Reto. ME, Fugeria. HM, Filipe. CM, Almedia. “Chemical composition of green tea ( Camellia sinensis) infusions commercialized in Portugal.” ncbi. Web. 20 April 2016.

HN, Graham. “Green tea composition, consumption, and polyphenol chemistry.” ncbi. 21 May, 1992. Web. 19 April 2016.

Forester, Sarah. Lambert, Joshua. “Antioxidants effects of green tea.” ncbi.12 Jun, 2013. Web. 19 April, 2016.

“Tea and Cancer Prevention.” National Cancer Institute. 17 November, 2010. Web. 19 April, 2016.

“The Chemistry Of Tea.” 1 Feb. 2014. Web. 19 April, 2016.

“Green Tea Ingredients and Chemistry Explained.” Web. 19 April, 2016.

S, Valcic. JA, Burr. BN, Timmerman. DC, Liebler. “ Antioxidant chemistry of green tea catechins. New Oxidation products of (-)-epigallocatechin gallate and (-)-epigallocatechin from their reactions with peroxyl radicals.” ncbi. 13 Sep, 2000. Web. 19 April, 2016.

Rosen, Diana.“The Chemistry of Tea.”Teamuse.  Web. 19 April, 2016.

Joshua HidalgoJos
hua Hidalgo is a hardworking student and a junior who believes that you should put your all into everything you do. He is an avid tea drinker, he is involved with choir in many ways. Some way he is involved in choir are, he is in vocal jazz, madrigal and was apart of all state. Joshua Hidalgo has also won an award from USD on his solo that he had in the amazing song Radioactive by Imagine Dragons. Joshua Hidalgo is also extremely interested in the chemistry of how the human body reacts with different substances such as tea.