Glucose + Fructose
This method is available in a kit only for the rAPID-T system. The range of the method is 0.1 to 6.0 g/L as glucose. Dilute samples above this range.
Wine samples are mixed with buffer at pH 7.8 containing NADP+ and ATP. Subsequent addition of the enzymes phosphoglucose isomerase (PGI), glucose-6-phosphate dehydrogenase (G6PD) and hexokinase (HK) convert glucose and fructose to glucose-6-phosphate (G-6-P). G-6-P is oxidized to gluconate-6-phosphate resulting in the formation of NADPH. The absorbance of NADPH at 340 nm is directly proportional to the glucose + fructose in the sample.
|Astoria 300||see Residual Sugar|
|Astoria 2||see Residual Sugar|
|rAPID-T||70-9400-13K||0.1 - 6.0 g/l|