Tea

[yugin]

drink only black tea, maybe once a day cup of instant coffee. And yeah, not forgetting nice cookies or cake more about caffeine content
Can't post links yet, so here it is caffeine content
Coffee
drip, regular 106-164 mg/5 oz
instant 93-134 mg
loose leaf tea
black 25-110 mg
green 8-36 mg
tea (black)
brewed 20-80 mg
1 min brew 21-33 mg/5 oz
5 min. brew 39-50 mg
iced tea 67-76 mg/12 oz.

 

[ZiSunka]

Are you sure? I have three different brands of tea at home and they all have a caffine count on the side of the box. Could you explain a little more? I know herbal tea (most of them) don't have caffine, but regular tea has Earl Grey has 40mg of caffine in each cup...green tea has about 30mg.

lambslove, can you give me a lesson in what theine is?

Okay, here is the chemistry lesson in which we learned about theine in college (I was a chemistry minor). You have two hands, a left and a right. You have two gloves for your hands, also a left and a right. But suppose you only had two right hand gloves. That would work fine for your right hand, but your left hand would be cold, because you couldn't put to into the glove.

Caffeine and theine are like the hands and your body is like the gloves. Caffeine is right-handed and theine is left-handed, they are the same chemical, just mirror opposites in structure, just like your hands. Caffeine "fits" into the cells of you body because all your body's cells are like right-handed gloves, only right-handed chemicals fit into them. So there's theine, floating around your body with nowhere to go, because they don't fit any of the cells.

So, because they are the same chemical, they both show up the same in chemical testing, because the tests aren't handed and don't separate out the right-handed chemicals from the left-handed chemicals, they just see all the chemicals the same. So your Earl Grey tea shows as having 40 mg of caffeine, but it's mostly all theine, so even though it's there, it doesn't have any effect on your body.

Questions?

 

[Gold Dragon]

Okay, here is the chemistry lesson in which we learned about theine in college (I was a chemistry minor). You have two hands, a left and a right. You have two gloves for your hands, also a left and a right. But suppose you only had two right hand gloves. That would work fine for your right hand, but your left hand would be cold, because you couldn't put to into the glove.

Caffeine and theine are like the hands and your body is like the gloves. Caffeine is right-handed and theine is left-handed, they are the same chemical, just mirror opposites in structure, just like your hands. Caffeine "fits" into the cells of you body because all your body's cells are like right-handed gloves, only right-handed chemicals fit into them. So there's theine, floating around your body with nowhere to go, because they don't fit any of the cells.

So, because they are the same chemical, they both show up the same in chemical testing, because the tests aren't handed and don't separate out the right-handed chemicals from the left-handed chemicals, they just see all the chemicals the same. So your Earl Grey tea shows as having 40 mg of caffeine, but it's mostly all theine, so even though it's there, it doesn't have any effect on your body.

Questions?

Sorry, but this is not true.

The left-hand, right-hand chemical phenomen you are referring to are chemicals called enantiomers, a subclass of stereoisomers.

However, caffeine and theine are not enantiomers but in fact are the same molecule both in atomic makeup and stereochemistry (3 dimensional structure). In fact it is impossible to have a stereoisomer of caffeine because its molecular structure is missing something known as a stereocenter to reflect a mirror image from. Another chemical erroneously called a stereoisomer of caffeine is mateine from Yerba Mate tea.

Article

One of the errors in the literature upon which the "mateine" claims are based is the claim that it is a stereoisomer of caffeine. This stands out because, as any organic chemist can easily tell you, there is no stereoisomer of caffeine. The caffeine molecule lacks a stereocenter and thus there are no rotational isomers at all. This error, repeated widely, shows the people writing the texts know little about chemistry and the rest of their information about this theoretical chemical must be considered suspect.

 

[Gold Dragon]

I think your college instructor may have been confused between theine (which is caffeine in tea) with something known as theanine.

Theanine is an amino acid very common in tea that does have both left and right stereoisomers. Theanine is a relative of glutamic acids (MSG is one glutamic acid) which usually stimulates the brain. However, Theanine has the opposite effect of of glutamic acids and actually relaxes.

 

[bleechers]

Regarding the OP: More NT "laws" that God never gave.

When will we ever learn?

 

[@@Paul@@]

Regarding the OP: More NT "laws" that God never gave.

When will we ever learn?

When we know "as we are known"??

 

[bleechers]

When we know "as we are known"??

True. But I was hoping for a "when we start walking in the Spirit and stop trying to please God in the flesh."

Alas, there are just too many people who want to burden believers with shackles that neither they nor their fathers could bear...

 

[@@Paul@@]

Right, I was being realistic...



As the "waterboy's" mom said: "Caffein is of the DEVIL bobby!!

 

[Echoes Peak]

I love tea. I drink it all the time I recently started drinking unsweetened hot tea. I would like to say it was for some amazingly, cool trendy reasons, but yeah, me and my fellow roommates didn't feel like splurging on sugar. (Read-poor college students).

 

[JM]

Which brands do you drink?

 

[moeowo]

I only like Sweet Iced Tea..Tetley is my favorite!! You could never tell I'm from Texas by the way I drink my tea

 

[Carrye]

I like it black. Coffee, tea, chocolate. It needs to have that acidic taste (to combat all of my natural sweetness! ).

And nice Chem lesson, GoldDragon. I haven't been able to dork it up like that since I took chem.

 

[Gold Dragon]

And nice Chem lesson, GoldDragon. I haven't been able to dork it up like that since I took chem.

no prob.

:nerd:

 

[Echoes Peak]

And nice Chem lesson, GoldDragon. I haven't been able to dork it up like that since I took chem.

Yeah, I know right. I'm not gonna lie. I was lost. But then again I have liberal arts major tattooed all over me.

 

[Grace_of_God]

I love tea! I don't see anything wrong with it. It relaxes me and I really like it just before bed. I prefer just the plain Red Rose/orange pekoe stuff.

 

[Carrye]

:nerd:

I have to say that the chem major makes you more nerdy than me and my biology. Though adding some theology does help my cause ... but it still seems less than your nerdiness. Hey, at least you weren't a physics major, then there'd be no hope for you!

 

[ZiSunka]

Sorry, but this is not true.

The left-hand, right-hand chemical phenomen you are referring to are chemicals called enantiomers, a subclass of stereoisomers.

However, caffeine and theine are not enantiomers but in fact are the same molecule both in atomic makeup and stereochemistry (3 dimensional structure). In fact it is impossible to have a stereoisomer of caffeine because its molecular structure is missing something known as a stereocenter to reflect a mirror image from. Another chemical erroneously called a stereoisomer of caffeine is mateine from Yerba Mate tea.

Hmm, let's see, do I believe the professors I had in two years of organic chemisty and biochemistry, or believe something you found on the internet.... Don't have to think too hard about that one.

It is not necessary to have a stereocenter to have stereochemicals. In fact, any chemicals which are mirror opposites of each other have "handedness." Think about it. Your hands don't have a stereocenter, yet they have handedness. Caffience and theine are two of those non-symmetrical, handed chemicals. And strangely, studies show that almost exactly the same amount of theine is expelled in the urine as is consumed. Not so caffeine. If your above quote was true, that would not happen.

 

[Gold Dragon]

It is not necessary to have a stereocenter to have stereochemicals. In fact, any chemicals which are mirror opposites of each other have "handedness." Think about it. Your hands don't have a stereocenter, yet they have handedness.

You are right lambslove, enantiomers can exist without a chiral/stereocenter. Link

Caffience and theine are two of those non-symmetrical, handed chemicals. And strangely, studies show that almost exactly the same amount of theine is expelled in the urine as is consumed. Not so caffeine. If your above quote was true, that would not happen.

I'm still trying to find literature to suggest that theine and caffiene are infact enantiomers. Could you recommend some?

 

[lucypevensie]

MMmmm. I had to go set up my pot for some hot chai when I started reading this thread. Put some honey and milk in and it's practically like Starbucks! Lots cheaper though.

 

[@@Paul@@]

How can a little word such as tea be so confusing??

enantiomers, chiral and stereocenters; oh my!!