Register to reply

How to test for the sweetness of substance?

by real
Tags: substance, sweetness, test
Share this thread:
real
#1
Dec28-05, 11:51 PM
P: 20
any testing solution or other method that can test for the sweetness of some substance. I mean except using the mouth.
Phys.Org News Partner Chemistry news on Phys.org
Moving single cells around?accurately and cheaply
Laser optical tweezers reveal how malaria parasites infect red blood cells (w/ Video)
The difficult question of Clostridium difficile
real
#2
Dec30-05, 09:54 PM
P: 20
any people can help on this problem?
GCT
#3
Dec31-05, 02:00 PM
Sci Advisor
HW Helper
GCT's Avatar
P: 1,769
it's kind of a weird suggestion, sweetness is subjective, in order to determine whether a substance is "sweet" you'll need to test it subjectively and statistically.

Ouabache
#4
Dec31-05, 10:41 PM
Sci Advisor
HW Helper
P: 1,326
How to test for the sweetness of substance?

If you're measuring a solution known to have sugar in it. You can measure the sweetness using Brix refractometry. It is commonly used to measure sweetness of fruit juice and wine.
real
#5
Jan1-06, 09:31 PM
P: 20
how about measure the sweetness of the sweetener?
i doesn't contain any sugar.
Ouabache
#6
Jan2-06, 12:52 AM
Sci Advisor
HW Helper
P: 1,326
Quote Quote by real
how about measure the sweetness of the sweetener?
i doesn't contain any sugar.
GCT summed that up very well, it is subjective and requires a statistical sampling by tasters (just like grading the quality of tea after a harvest).
real
#7
Jan2-06, 05:49 PM
P: 20
then why i can find the detail that some sweeteners are about 100times sweetness of sucrose, and some is about 1000 times. how can the scientist get this kind of value?
Ouabache
#8
Jan2-06, 10:11 PM
Sci Advisor
HW Helper
P: 1,326
Measuring sweetness
There are no laboratory instruments to perform the task, no absolute or even arbitrary units of sweetness. Instead we have to rely on the human tongue and the hope that if we average the findings of large numbers of tongues we can obtain useful data. The data scientists obtain will still not be in absolute units but will be expressed relative to some arbitrary standard, usually sucrose.
The above reverence agrees with my and GCT's assesment that further measurement is purely subjective (following the underlined hyperlink).

A typical way a panel assess sweetness is to make a dilution series of the solution. (10:1, 100:1, 1000:1 etc...) At some dilution, the entire panel will no longer taste any sweetness. A relative scale is constructed based on this taste test. (similarly Scoville Units were developed to measure heat (spicey) units).


Register to reply

Related Discussions
Ph of a substance Introductory Physics Homework 4
What is critical substance? Biology 6
Sugar with the fewest calories per sweetness Chemistry 2
Substance and knowledge General Discussion 4