二氢杨梅素的稳定性及其影响因素

Stability of Dihydromyricetin and Factors Affecting the Stability

二氢杨梅素是一种重要的黄酮类物质,具有较好的抗氧化活性.通过溶析称重法测定了溶解度的变化,采用紫外 可见光谱扫描法研究其化学结构的变化,结果表明:二氢杨梅素溶液易发生氧化,稳定性较差,在不超过100℃,加热时间不超过30min以及酸性和中性条件可保持其化学结构稳定,而过渡态金属离子Al3+,Fe3+,Cu2+等对二氢杨梅素的氧化则起到诱导催化作用.

Dihydromyricetin is an important kind of flavonol. It has some health protection functions and antioxidation activity to TBHQ. The solubility of dihydromyricetin with the way of dissolving - separating out- quantifying weight was studied and changes in chemical structure of dihydromyricetin was confirmed by ultraviolet/visible region scan. The result showed that dihydromyricetin was unstable in water, unless it existed in aqueous phase under 100 ℃ for less than 30 min. Under the acidic and neutral conditions, the chemical structure of dihydromyricetin was stable. In the processes of extracting and using dihydromyricetin, metal ion sould be wiped off, as transitional metal ions such as Al^(3+)?Fe^(3+)?Cu^(2+)could induce oxidation.