Vinmetrica's Residual Reducing Sugar (RRS) Assay Kit allows you to accurately measure residual sugar (glucose + fructose) in your sample. The RRS kit is based on the Rebelein, or "Gold Coast" method in which "reducing" sugars are oxidized by alkaline copper sulfate; the amount of copper remaining is then determined by titration to get an accurate value for residual sugar. Provided reagents will allow you to perform ~30 Residual Reducing Sugar tests.
What is Residual Sugar?
Residual sugar (RS) refers to any significant concentration of sugar that is contained in wine, beer or cider at the end of fermentation. Winemakers and brewers are typically most interested in knowing the concentration of the fermentable hexoses glucose and fructose, the main reducing sugars. These determine the level of sweetness of the finished product. At residual sugar levels around 2 g/L (0.2%) or higher, an alcoholic beverage can spontaneously restart fermentation unless it has been properly stabilized.
NOTE: This kit does not detect sucrose directly. We provide a method for hydrolyzing any sucrose prior to analysis if you want to include sucrose in your results with the RRS kit.
- Clarifying Powder (PVPP) for decolorizing red wines
- Copper Sulfate Solution
- RRS Binding Solution (Rochelle Salt)
- RRS Titrant (0.20 M sodium thiosulfate)
- RRS Developer Solution (KI)
- RRS (1+5) Sulfuric Acid Solution
- A User Manual
- Reaction Bottles (2)
- 10.00 mL volumetric pipette
- pipetting safety bulb
- 3 transfer pipettes
- 10 mL sampling pipette
- 5 mL sampling pipette
- 15 mL conical tubes (5)
- Filtration Kit: 5 mL syringe (PN: SC-100-6), 25 mm filter holder (PN: RRS-13), 25 mm filters 15
- pieces, (PN: RRS-14)
- 10mL Burette, Clamp, and Stand
See It In Action
For shipping orders, this product is drop shipped directly from the manufacturer. Please allow 1-3 weeks for delivery. For pickup orders, we carry a supply of these in all our stores but will contact you if we are out at the time of your order.