Is there more caffeine in tea or coffee? - Yahoo! UK & Ireland Answers

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ben ben

* Member since:
05 August 2006
* Total points:
486 (Level 2)

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** Is there more caffeine in tea or coffee? **

· 7 years ago
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Right so its, tea, per pound, but coffee, per cup. Cheers everyone!

7 years ago

low_on_ram by low_on_r...

* Member since:
14 September 2006
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Source: uk.answers.yahoo.com/question/index?qid=20060923065234AAfN3iq


is there caffeine in tea


Caffeine - Wikipedia, the free encyclopedia

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** Caffeine **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
This article is about the stimulant drug. For other uses, see Caffeine
(disambiguation).
Page semi-protected

Caffeine

Caffeine molecule
Systematic (IUPAC) name
1,3,7-Trimethyl-1/H/-purine-2,6(3/H/,7/H/)-dione
3,7-Dihydro-1,3,7-trimethyl-1/H/-purine-2,6-dione
Clinical data
AHFS/Drugs.com monograph
Pregnancy cat. C(US)
Legal status Unscheduled (AU) GSL (UK) OTC (US)
Dependence liability Moderate
Routes Oral, insufflation, enema
Pharmacokinetic data
Bioavailability 99%
Protein binding 17% to 36%
Metabolism demethylation by CYP1A2
Half-life 5 hours
Excretion urine (100%)
Identifiers
CAS number 58-08-2
ATC code N06BC01
PubChem CID 2519
DrugBank DB00201
ChemSpider 2424^ YesY
UNII 3G6A5W338E^ YesY
KEGG D00528^ YesY
ChEBI CHEBI:27732^ YesY
ChEMBL CHEMBL113^ YesY
Chemical data
Formula C[8]H[10]N[4]O[2]^ 
Mol. mass 194.19 g/mol
SMILES eMolecules & PubChem
InChI

· InChI=1S/C8H10N4O2/c1-10-4-9-6-5(10)7(13)12(3)8(14)11(6)2/h4H,1-3H3
Key:RYYVLZVUVIJVGH-UHFFFAOYSA-N^ YesY

Properties:

Molecular formula C[8]H[10]N[4]O[2]
Molar mass 194.19 g mol^−1
Exact mass 194.080376 u
Appearance Odorless, white needles or powder
Density 1.23 g/cm^3, solid^[1]
Melting point 235–238 °C, 500–501 K (anhydrous)
234–235 °C, 507–508 K (monohydrate)

Boiling point 178 Â°C, 451 K, 352 Â°F (subl.)

Solubility in water 2.17 g/100 mL (25 °C)
18.0 g/100 mL (80 °C)
67.0 g/100 mL (100 °C)
Solubility ethanol 15 g/L^[2]
Acidity (p/K/[a]) -0.13–1.22 protonated caffeine^[3]
Dipole moment 3.64 D (calculated)

Hazards:

MSDS ICSC 0405
EU Index 613-086-00-5
EU classification Harmful (*Xn*)
R-phrases R22
S-phrases (S2)
NFPA 704 NFPA 704.svg2
LD[50] 192 mg/kg (rat, oral)^[4]

*Caffeine* is a bitter, white crystalline xanthine alkaloid and a stimulant
drug. Caffeine is found in varying quantities in the seeds, leaves, and
fruit of some plants, where it acts as a natural pesticide that paralyzes
and kills certain insects feeding on the plants, as well as enhancing the
reward memory of pollinators. It is most commonly consumed by humans


Source: en.wikipedia.org/wiki/Caffeine

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