Register to reply

Citric acid effect on body chemistry pH

by dansavage
Tags: acid, body, chemistry, citric, effect
Share this thread:
dansavage
#1
Dec12-11, 12:59 AM
P: 1
I see a lot of quacky sites about acid/alkaline body chemistry claiming that lemon juice and orange juice make the body alkaline. They both contain citric acid, orange juice also has lots of potassium... I cannot think of any mechanism whereby citric acid would somehow cause a persons body to become more alkaline. The theory is that every food when burned forms either an alkali or acidic ash, and this ash has an effect to alkalize or acidify the body, not just the blood. I can't find any evidence that citric acid alkalizes anything although sodium citrate is an antacid.
I can't find anything online except for these sites that claim it does alkalize the body...

Does citric acid really alkalize the body or blood? If so by what mechanism?

Thanks
Dan
Phys.Org News Partner Chemistry news on Phys.org
Team pioneers strategy for creating new materials
Plug n' Play protein crystals
Intracellular imaging gets interactive
Borek
#2
Dec12-11, 03:19 AM
Admin
Borek's Avatar
P: 23,588
Quackery squared.

I am not sure about biological details, there can be some additional things that I am not aware of. But in general pH of the body is maintained by very effective mechanisms that don't allow it to change by more than several hundreds of pH unit, no matter what we eat. That's what homeostasis is about. Blood pH is kept between 7.35 and 7.45.
chemisttree
#3
Dec12-11, 04:04 AM
Sci Advisor
HW Helper
PF Gold
chemisttree's Avatar
P: 3,724
Quote Quote by dansavage View Post
I see a lot of quacky sites about acid/alkaline body chemistry claiming that lemon juice and orange juice make the body alkaline.
Well you came to the wrong place if you want an explanation. We don't make it a habit to explain quackery.

Nobody understands the alkalizing diet including the frauds that support it.

Onsan
#4
Feb3-12, 07:26 AM
P: 4
Citric acid effect on body chemistry pH

My wife came to me with this and we had a long discussion about it (mostly me beating my head against a wall), imo, this is a classic case of quacks misinterpreting and misrepresenting basic chemistry.

Acid is acid, they acidify, bases are alkali, they alkalise.
When an acid is alkalised it can form products which are alkalising, but in the process it reduces alkalinity.
In the case of Citric Acid, when alkalised it can form citrates which do play a role in the body, primarily as an oxidant of fats/proteins/carbs. Fundamentally though, it was alkalised, so it reduced alkalinity, it acidified the solution, what is left over can still be alkaline (in pH), no problems there (so long as there was sufficient alkalinity), but citric acid is not alkalising in itself, it's an acid.
That's where I think they've gotten messed up, sure, it forms products that can alkalise...but they only did that by being alkalised (and therefore reducing alkalinity) in the first place.
adding acid can only acidify.
Borek
#5
Feb3-12, 08:29 AM
Admin
Borek's Avatar
P: 23,588
Quote Quote by Onsan View Post
(mostly me beating my head against a wall)
I can offer sympathy, not much more.

When an acid is alkalised it can form products which are alkalising, but in the process it reduces alkalinity.
You have lost me somewhere between "alkalised" and "alkalising". I guess by "alkalised" you meant "neutralized".
Onsan
#6
Feb3-12, 09:30 AM
P: 4
to make alkaline by forming a conjugate base.
Borek
#7
Feb3-12, 12:32 PM
Admin
Borek's Avatar
P: 23,588
Quote Quote by Onsan View Post
to make alkaline by forming a conjugate base.
What do you mean by "make alkaline" then?

Process in which acid reacts with OH- forming conjugate base is called neutralization.


Register to reply

Related Discussions
50% citric acid solution Chemistry 4
ATP in Fatty acid oxidation and citric acid cycle Biology, Chemistry & Other Homework 1
Citric acid Chemistry 4
PH Citric Acid Biology, Chemistry & Other Homework 9
Citric acid Chemistry 5