Division 6.2 Measurement by saccharimeter

United Kingdom

Starch content (%) = \frac{2 000}{{[α]}_{20°}^{D}} \times \frac{(2 N \times 0,665) \times (S - S')}{100} - \frac{26,6 N \times (S - S')}{{[α]}_{20°}^{D}}

Total optical rotation in saccharimeter degrees

Optical rotation in saccharimeter degrees of the substances soluble in 40 % (v/v) ethanol

weight (g) of saccharose in 100 ml of water yielding an optical rotation of 100 saccharimeter degrees when measured using a 200 mm tube

16,29 g for the French saccharimeters

26,0 g for the German saccharimeters

20,0 g for mixed saccharimeters.

{[α]}_{20°}^{D}

Specific optical rotation of pure starch (see 6.1)