茶多酚双液相氧化制取茶色素参数研究

对茶多酚双液相酸性氧化制取茶色素的参数进行了研究,结果表明:除了搅拌速度和供氧外,茶多酚浓度、温度、氧化剂浓度、酯比例、反应时间和pH值均对茶色素中茶黄素(TFs)和茶红素(TRs)的形成有较大影响。相对低的茶多酚浓度、低的温度、低的氧化剂浓度、低的酯比例、短的反应时间和低的pH值有利于TFs的形成。在茶多酚浓度、温度、氧化剂浓度、酯比例、反应时间高值和pH低值时可取得较高的茶色素得率。

Study on preparing parameters of tea pigments from tea polyphenols oxidized in two-liquid-phase system

Preparing parameters of tea pigments from tea polyphenols oxidized in two-liquid-phase system were studied. The result showed that there was the more effects of concentration of tea polyphenols, temperature, concentration of oxidant, ester proportion, pH value and reaction time on forming theaflavins(TFs) and thearubigins(TRs) in tea pigments, except for stirring speed and supply oxygen. Lower concentration of tea polyphenols and concentration of oxidant, lower temperature, lower proportion of ester, shorter reaction time and lower pH value was of great advantage to formation of TFs was opposite. Under condition of higher concentration of tea polyphenols, and concentration of oxidant, higher temperature and ester proportion and lower pH value, there could be the higher yield of tea pigments.