caffeine transport in single cup coffee packets
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Caffeine Transport in Single Cup Coffee Packets. Eric Anderson Alana Warner- Tuhy. Introduction. Reason for Study Experimental Parameters Results Conclusions References. Justification for Study. Warning on the back of coffee packet - PowerPoint PPT PresentationTRANSCRIPT
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Caffeine Transport in Single CupCoffee Packets
Eric AndersonAlana Warner-Tuhy
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Introduction
• Reason for Study• Experimental Parameters• Results• Conclusions• References
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Justification for Study
• Warning on the back of coffee packet• How much does brewing conditions affect the
final caffeine concentration?
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Experimental Parameters• Three different brewing methods– No interference– Dunk bag in water, as per directions– Continuously stir
• Other than convective conditions, all other parameters were constant
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Purification and Extraction
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Method 1 Results
0 1 2 3 4 5 6 7 8 9 100
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Color and Caffeine Comparison
Color Caffeine
Time (min)
Nom
alize
d Co
ncen
trati
on
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Color Comparison
0 10 20 30 40 50 600.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
Color Dependence on Time
Still Dunked for 15 sec at 1 min Well Mixed
Time (min)
Abso
rban
ce
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Caffeine Conc. Comparison
0 10 20 30 40 50 60 700
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Caffeine Concentration
StillDunkedStirred
Time (min)
Caffe
ine
Conc
entr
ation
(mg/
mL)
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Final Caffeine ComparisonMethod Time (min) Final Concentration (mg/ml)
1 5 0.12
2 5 0.14
3 5 0.13
1 10 0.22
2 10 0.14
3 10 0.52
1 60 0.39
2 60 0.15
3 60 0.92
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Results
5 Minutes– Any method will work
10 Minutes– Double the caffeine by leaving coffee undisturbed– 4 times the caffeine by continuously stirring coffee
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Conclusions
• The convective component greatly affects the final caffeine concentration
• Color is not an adequate indicator of caffeine concentration
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References
• Spiro, M., Lam, P., Food Chemistry, 1995 , vol. 54, p393-396.