Hydrostatic pressure effects on the fluorescence of tyrosine solution with different concentrations of copper ion

• Published in: Journal of luminescence 2012-09, Vol.132 (9), p.2228-2231
• Main Authors: chun-yue, Jiang, zhi-juan, Sun, hao-yu, Pan, run-qing, Xiang, peng-tao, Li, shu-ming, Ye, hang, Chen
• Format: Article
• Language: English
• Subjects: Aqueous solutions; Chemistry; Copper; Copper ion; Exact sciences and technology; Fluorescence; Fluorescent spectrum; General and physical chemistry; Hydrostatic pressure; Luminescence; Quenching; Quenching (cooling); Solution properties; Solutions; Tyrosine
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2012.04.003

The effects of hydrostatic pressure on the fluorescence of tyrosine (Tyr) solution with different concentrations of copper ion (Cu2+) were investigated. The fluorescent intensity of pure Tyr aqueous solution enhanced with the increase of hydrostatic pressure, the fluorescent intensity increased by 8.8% when the pressure was up to 60MPa. The fluorescence of Tyr aqueous solution was quenched obviously due to complex formation with Cu2+ and the quenching became stronger when the concentration of Cu2+ was higher. When the concentration ratio of Cu2+ and Tyr ([Cu2+]/[Tyr]) increased from 0 to 40, the fluorescent intensity decreased to 19.0% at 0.1MPa and 24.2% at 60MPa. It was also found that the effects of pressure on the fluorescent intensity of Tyr aqueous solution were different at various [Cu2+]/[Tyr]. The fluorescent intensity increased by 14.4% and 38.4% for 1 and 40 ratio respectively when the pressure was changed from 0.1MPa to 60MPa. ► Fluorescent intensity of Tyr solution enhanced with increased hydrostatic pressure. ► Fluorescent intensity decreased with increased concentration of copper ion. ► Fluorescent intensity of Tyr solution with Cu2+ was correspondingly enhanced by pressure.