Table 1. Complex carbohydrate and sweetener concentrations used for determination of detection thresholds.
| Stimulus | Concentration (% w/v) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
| Maltodextrin | 0.04 | 0.06 | 0.1 | 0.2 | 0.3 | 0.6 | 1.1 | 1.9 | 3.6 | 6.3 | 11.2 | 20.0 |
| Amount of Glucose in Maltodextrin (10−3) | 0.3 | 0.5 | 0.9 | 1.6 | 2.8 | 5.8 | 9.0 | 15.9 | 28.4 | 50.5 | 90.0 | 160.0 |
| Amount of Total Sugars in Maltodextrin (10−3) | 1.1 | 1.6 | 3.0 | 5.6 | 9.8 | 17.6 | 31.4 | 55.7 | 99.4 | 176.7 | 314.7 | 560.0 |
| Oligofructose | 0.04 | 0.06 | 0.1 | 0.2 | 0.3 | 0.6 | 1.1 | 1.9 | 3.6 | 6.3 | 11.2 | 20.0 |
| Amount of Fructose in Oligofructose (10−3) | 0.5 | 0.8 | 1.5 | 2.8 | 4.9 | 8.8 | 15.6 | 27.8 | 49.7 | 88.3 | 157.3 | 280.0 |
| Amount of Total Sugars in Oligofructose (10−3) | 1.2 | 1.8 | 3.3 | 6.6 | 10.5 | 18.9 | 33.6 | 59.7 | 106.5 | 189.3 | 337.2 | 600.0 |
| Glucose | 0.02 | 0.03 | 0.05 | 0.09 | 0.1 | 0.2 | 0.4 | 0.6 | 1.1 | 1.8 | 2.9 | 4.8 |
| Fructose | 0.01 | 0.02 | 0.03 | 0.05 | 0.08 | 0.1 | 0.2 | 0.3 | 0.5 | 0.9 | 1.5 | 2.5 |
| Sucrose | 0.01 | 0.02 | 0.03 | 0.06 | 0.09 | 0.1 | 0.2 | 0.4 | 0.7 | 1.2 | 1.8 | 3.0 |
| Sucralose (10−3) | 0.02 | 0.04 | 0.06 | 0.09 | 0.1 | 0.2 | 0.4 | 0.7 | 1.1 | 1.9 | 3.1 | 5.1 |
| Rebaudioside A (10−3) | 0.03 | 0.05 | 0.09 | 0.1 | 0.2 | 0.3 | 0.6 | 1.0 | 1.7 | 2.8 | 4.6 | 7.7 |
| Erythritol | 0.02 | 0.03 | 0.05 | 0.08 | 0.1 | 0.2 | 0.3 | 0.6 | 0.9 | 1.6 | 2.6 | 4.4 |
The concentration series for sucrose was adapted from ISO3972 [17]. The concentration series for maltodextrin, oligofructose, glucose, fructose, sucralose, erythritol, and Rebaudioside A were prepared with successive 0.25 log dilution steps. Reference chemical details: maltodextrin (Star-Dri 5, Tate & Lyle Ingredients Americas, USA); oligofructose (Fibrulose F97, CoSucra-Groupe Warcoing, Belgium); glucose (The Melbourne Food Depot, Melbourne, Australia); fructose (The Melbourne Food Depot, Melbourne, Australia); sucrose (CSR, Yarraville, Australia); sucralose (The Melbourne Food Depot, Melbourne, Australia); Rebaudioside A (AuSweet, Melbourne, Australia); and erythritol (AuSweet, Melbourne, Australia). Calculation of the amount of common and total sugars in maltodextrin and oligofructose concentrations were according to the report of analysis by the Australian Government National Measurement Institute from samples used in this study, where there were a total of 2.8g/100g (2.8% w/w) of free sugars for the maltodextrin (Glucose: 0.8% w/w) and 3.0g/100g (3.0% w/w) of free sugars for the oligofructose (Fructose: 1.4% w/w).