Table 1 Physical and chemical index project indicators Excellent grade one total sugar content (sucrose + reducing sugar)/(g/100g) ≥ 90.0 85.0 Weight loss on drying/(g/100g) ≤ 4.0 4.5 Water-insoluble impurities/(mg/kg) ≤ 100 150 Calcium/(mg/kg) ≥ 300 Iron/(mg/kg) ≥ 3.0 Zinc/(mg/kg) ≥ 0.5 Total amino acids/(g/100g) ≥ 0.5 Total flavonoids/(mg/kg) ≥ 10 Total phenolic a/(mg/kg) ≥ 50 a is the limit index, and premium brown sugar should have one (or more than one) index that meets the requirements.