Physical and chemical index project indicators Dry matter (solid matter)/% ≥ 60.0 Total sugar (sucrose + reducing sugar)/(g/100g) ≥ 50.0 pH value 4.5~7.0 Total flavonoids (calculated as anhydrous rutin)/(mg/ 100g)≥ 15.0 Total phenols/(mg/100g)≥ 100.0 Aminopeptide nitrogen/(mg/100g)≥ 80.0 Hydroxymethylfurfural/(mg/kg)≤ 20.0