Ingemar wrote:Believe it or not, I was just doing an experiment to extract caffeine three hours ago.
The first extraction step is familiar to all coffee and tea drinkers--you put the bag of tea in boiling water. Once that is done, the "tea" (there are some reagents that you add to cleave ester bonds, etc) is filtered via vacuum filtration and the filtrate is extracted via liquid-liquid extraction with a solvent in which caffeine will preferentially dissolved. I haven't done this step yet, but once the caffeine is extracted, the solvent is evaporated. What should be left is some dry gunk with caffeine inside. A sublimator will sublimate the caffeine out of the gunk and the gaseous caffeine will collect on the surface of a test tube with ice inside. (Sublimation btw is the direct transition from solid to gas).Mr. SmartyPants wrote:How does one do that?
Ingemar wrote:The first extraction step is familiar to all coffee and tea drinkers--you put the bag of tea in boiling water. Once that is done, the "tea" (there are some reagents that you add to cleave ester bonds, etc) is filtered via vacuum filtration and the filtrate is extracted via liquid-liquid extraction with a solvent in which caffeine will preferentially dissolved. I haven't done this step yet, but once the caffeine is extracted, the solvent is evaporated. What should be left is some dry gunk with caffeine inside. A sublimator will sublimate the caffeine out of the gunk and the gaseous caffeine will collect on the surface of a test tube with ice inside. (Sublimation btw is the direct transition from solid to gas).
KBMaster wrote:NOOOOOOO! HOW COULD YOU SAY THAT?!?! CAFFEINE IS THE BEST THING IN THE WORLD!!! I WOULD EAT MY LEFT FOOT JUST TO GET SOME!!!!
And what's wrong with playing video games for 7 hours on caffeine?! That sounds... wonderful....!
Doubleshadow wrote:Ugh. Caffeine. We just finished analyzing the amount of caffeine and acetylsalicylic (ASA) in some Anascin tablets in my instrumentation class. I just typed a two page write up and I'm sure I'll need to expand it. Caffeine gives me head aches, too. It is interesting to note that caffeine makes you hyper using the same chemical pathways that some diseases use to kill you.
shooraijin wrote:In all seriousness, I have overdosed on caffeine but in tablet form during long drives. This was accidental because I stacked doses too close and while I didn't get (fortunately) any of the life-threatening arrhythmias you can get from this, I did get unbelievably ill and vomited all night.
kaemmerite wrote:I did that too, actually, in Power School once. I came into class, took two No-Doz, and drank a can of Mountain Dew, and still fell asleep. During the next break, I took two more No Doz, drank another can of Mountain Dew, and fell asleep again. So finally I just decided to keep taking No Doz until I stayed awake. Eight more pills and three more cans of Mountain Dew later, I was awake...but I wished I wasn't, because I was so unbelievably sick.
shooraijin wrote:I'll have another Dr Pepper, please.
In all seriousness, I have overdosed on caffeine but in tablet form during long drives. This was accidental because I stacked doses too close and while I didn't get (fortunately) any of the life-threatening arrhythmias you can get from this, I did get unbelievably ill and vomited all night. After I finished emptying my digestive system and computed how much I probably had taken total, it came to something like 15 cans of Dr Pepper (45mg/12oz).
The long and short of it is, avoid No-Doz and Vivarin. Stick with a can of soda, it's safer.
Puritan wrote:No-Doze with a Mountain Dew chaser?! I've heard horror stories about Navy Power school, but didn't realize it was quite that bad. I guess the legacy of Adm. Rickover is alive and well, then.
You'd think you'd develop tolerance to the stuff after awhile, but I can still get good mileage out of a 32oz drink (will keep me plugging for a good several additional hours).
shooraijin wrote:Toxic dose is something over 250mg at a sitting]http://www.ameribev.org/health/caffeinecontent.asp[/url] ). Odds are you'd throw up from the fluid intake required rather than the caffeine to get toxic that way.
NoDoz, Vivarin, etc., are 200mg/tablet, btw. LD50 = lethal dose for 50%
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