CAJ | 학술논문

利用荧光光谱和紫外-可见吸收光谱研究了pH=12.0及不同温度下,水溶性硫化镉纳米晶与明胶结合反应的光谱行为,实验发现在明胶溶液中硫化镉的生成对明胶的内源荧光有较强的猝灭作用.用Lineweave Burk方程处理实验数据,发现硫化镉与明胶发生反应生成了配合物,结合红外和紫外-可见吸收光谱结果,属于静态荧光猝灭;计算了不同温度下反应的结合常数K(285 K:1.07×10~4 L/mol;292 K:9 69×10~3 L/mol:299 K:8.06×10~3 L/mol)及对应温度下结合反应的热力学参数(△H=-14.18 kJ/mol;△G=-21.98/-22.28/-22.36 kJ/mol: △S=27.36/27 74/27.36 J/(K·mol),证明二者主要靠静电作用力结合.根据F(o)rster的偶极偶极非辐射能量转移原理计算出结合位置距离色氨酸残基4 09 nm,发生分子内的非辐射能量转移,为探讨纳米颗粒与此类生物大分子之间相互作用的化学机制提供了重要的信息.
이용형광광보화자외-가견흡수광보연구료pH=12.0급불동온도하,수용성류화력납미정여명효결합반응적광보행위,실험발현재명효용액중류화력적생성대명효적내원형광유교강적졸멸작용.용Lineweave Burk방정처리실험수거,발현류화력여명효발생반응생성료배합물,결합홍외화자외-가견흡수광보결과,속우정태형광졸멸;계산료불동온도하반응적결합상수K(285 K:1.07×10~4 L/mol;292 K:9 69×10~3 L/mol:299 K:8.06×10~3 L/mol)급대응온도하결합반응적열역학삼수(△H=-14.18 kJ/mol;△G=-21.98/-22.28/-22.36 kJ/mol: △S=27.36/27 74/27.36 J/(K·mol),증명이자주요고정전작용력결합.근거F(o)rster적우겁우겁비복사능량전이원리계산출결합위치거리색안산잔기4 09 nm,발생분자내적비복사능량전이,위탐토납미과립여차류생물대분자지간상호작용적화학궤제제공료중요적신식.
The interaction between water-soluble CdS and gelatin 5n aqueous solution was explored using fluorescence,infrared (IR)and UV-Vis spectra at pH 12.0 and different temperatures.Results show that the formed complex had a strong ability to quench the fluorescence launched from gelatin.The fluorescence quenching data were analvzed according to Lineweave-Burk double-reciprocal equation and the gelatin had reacted with CdS to form a complex.This kind of static fluorescence quenching goes with non-radiation energy transfer happening within single molecule According to Lineweave-Burk equation,K(285 K:1.07×10~4 L/mol;292 K:9 69×10~3 L/mol;299 K:8.06×10~3 L/mol),the formation constants of the compound at different temperatures and the thermodynamic parameters(△H=-14.18 kJ/mol;△G=-21.98/-22.28/-22.36 kJ/mol;△S=27.36/27.74/27.36 J/K·mol) at certain temperatures were obtained,indicating that the binding force between them is mainly the static in nature.The binding locality was an area of 4.09 nm away from tryptophan residue in gelatin based on F(o)rster's non-radiation energy transfer mechanism.The results provide information for exploring the chemical mechanism of interaction between nanoparticle and this kind of biological macromolecule.