How to test for the sweetness of substance?

1. Dec 28, 2005

real

any testing solution or other method that can test for the sweetness of some substance. I mean except using the mouth.

2. Dec 30, 2005

real

any people can help on this problem?

3. Dec 31, 2005

GCT

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.

4. Dec 31, 2005

Ouabache

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. :tongue2:

Last edited: Jan 1, 2006
5. Jan 1, 2006

real

how about measure the sweetness of the sweetener?
i doesn't contain any sugar.

6. Jan 2, 2006

Ouabache

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). :tongue2:

7. Jan 2, 2006

real

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?

8. Jan 2, 2006

Ouabache

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).