Syringic Acid Extracted from Herba dendrobii Prevents Diabetic Cataract Pathogenesis by Inhibiting Aldose Reductase Activity

Table 6

pH value effects on syringic acid and AR binding.

pH value	Mr of syringic acid-Ar compound
6.0	36197.38
6.7	36202.75
8.0	36204.77
9.0	36206.79

The maximum molecular weight of 36206.79 was detected at pH 9, suggesting that changing pH values affects syringic acid and AR binding.