UPLC法同时测定烤烟中6种多酚的研究

为快速、准确地测定烟草中绿原酸、芸香苷和莨菪亭等多酚类化合物的含量,建立一种同时测定烤烟中新绿原酸、绿原酸、隐绿原酸、莨菪亭、芸香苷和莰菲醇基-3-芸香糖苷的超高效液相色谱(UPLC)分析方法。采用HSS T_3高强度硅胶色谱柱(HSS,high strength silica),梯度洗脱。该试验方法的加标回收率在94.4%~106.8%,检出限为3.7~9.9μg/g,相对标准偏差0.9%~3.4%(n=5),标准溶液的相关系数均大于0.9995。采用该方法测定不同来源的18个烤烟样品,结果发现烤烟中6种多酚的含量从高到低依次为绿原酸、芸香苷、隐绿酸、新绿原酸、莰菲醇基-3-芸香糖苷、莨菪亭。与传统的高效液相色谱法(HPLC)相比,该试验方法简单,分析时间短,能够满足对烤烟中多酚含量的测定要求。

Spectrophotometric studies on the interaction between chlorogenic acid, neochlorogenic acid, cryptochlorogenic acid and lysozyme

The interactions of chlorogenic acid （CA）, neochlorogenic acid （NCA） and cryptochlorogenic acid （CCA） with lysozyme （LYSO） were investigated in physiological buffer by fluorescence spectroscopy. The mechanism study indicated that CA, NCA and CCA could strongly quench the intrinsic fluorescence of LYSO through static quenching procedures with one binding site. Thermodynamic data show that the major force in the binding processes of CA to LYSO was hydrophobic interactions; for NCA, it was the hydrogen bonds and van der Waals forces, as for the CCA system, the mainly force is electrostatic force.