Commercial Services - Analyses
Sugar analysis and hydrometry
| Prices per analysis | |
| Analysis | Per Sample (excluding GST) |
| Glucose + Fructose by Winescan | $10 |
| Specific Gravity by Winescan | $10 |
| Volume required - 50 mL | |
| Target response time - 24 hrs | |
| Brix / Baumé | $10 |
| Volume required - 10 mL or 200 berries | |
| The target response - 24 hrs | |
| Sucrose by Rebelein | $35 |
| Reducing Sugar by Rebelein | $25 |
| Volume required - 25 mL | |
| The target response - 24 hrs | |
| Glucose + Fructose by Daytona | $30 |
| Volume required - 10 mL | |
| The target response - 24 hrs | |
| Specific gravity by density meter | $20 |
| Volume required - 25 mL | |
| The target response - 24 hrs | |
Glucose + Fructose
Glucose + Fructose are measured using the FOSS FTIR Winescan or the Randox Daytona enzymatic analyser. This may also be measured in combination with organic acids by HPLC.
Sucrose
The Rebelein method provides a method of determining the reducing sugars present in wine and grape juice samples. This method involves reacting the reducing sugars present in these sample with excess alkaline cupric (Cu++) tartrate, from which the concentration of reducing sugars is determined from the amount of Cu++ remaining after reaction. The Cu++ remaining can be determined by reducing the Cu++ with iodine (2Cu++ + 2I- → 2Cu+ + I2) and estimating the remaining iodine with standard thiosulphate solution (I2 + 2S2O32- → 2I- + S4O62-).
Brix/Baumé
Brix is measured using a digital refractometer and can easily be converted to baumé by dividing the brix result by 1.8.
Specific gravity
A FOSS FTIR Winescan density meter may be used to measure specific gravity. Specific gravity is a requirement of some export certificates.