CAJ | 학술논문

研究了绿茶和乌龙茶茶汤与金属离子Al3+，Fe3+，Pb2+，Cu2+，Cr6+的络合反应。在不同pH值、反应时间、反应温度、pH调节剂和金属离子初始浓度条件下，测定茶多酚的沉淀率，分析不同条件下,茶多酚沉淀率的变化。结果表明：当茶汤pH值为6~7，反应时间为30 min, pH调节剂为0.5~2.5 mg/L 的NaHCO3溶液时，茶汤与实验所测各种金属离子络合效果最好。反应温度对络合反应影响不大，反应温度升高，金属离子的沉淀率略有下降。另外，随着金属离子初始浓度的升高，金属离子的沉淀率也有所降低。从金属离子与各种茶汤进行络合反应的最佳体积比来看，绿茶汤的用量较少。
연구료록다화오룡다다탕여금속리자Al3+，Fe3+，Pb2+，Cu2+，Cr6+적락합반응。재불동pH치、반응시간、반응온도、pH조절제화금속리자초시농도조건하，측정다다분적침정솔，분석불동조건하,다다분침정솔적변화。결과표명：당다탕pH치위6~7，반응시간위30 min, pH조절제위0.5~2.5 mg/L 적NaHCO3용액시，다탕여실험소측각충금속리자락합효과최호。반응온도대락합반응영향불대，반응온도승고，금속리자적침정솔략유하강。령외，수착금속리자초시농도적승고，금속리자적침정솔야유소강저。종금속리자여각충다탕진행락합반응적최가체적비래간，록다탕적용량교소。
The research aimed to study the complexation reaction of green tea and oolong tea soup with metal ions, such as Al3+,Fe3+,Pb2+,Cu2+,Cr6+. The deposition rate of tea polyphenol were determined at varying pH, time, temperature, pH regulator and initial metal ions concentration, namely that the changes of deposition rate of tea polyphenol were analyzed under different conditions. Results showed that the most suitable condition for the complexation reaction of tea soup with metal ions was as follows:pH value at about 6~7, response time of 30 min and NaHCO3 solution as pH regulator at concentration of 0.5~2.5 mg/L. The temperature did not exert much effect on the complexation reaction, and the deposition rate slightly decreased as temperature increased. Besides, the rise of initial metal ions concentration would lead to the decline of deposition rate. In terms of the best volume ratio of tea soup to metal ion in the complexation reaction, the green tea was the least used.