Photodecomposition Quantum Yield of Aqueous Solution of Cysteine and Tyrosine at 213 nm

• Main Author: 黃貫瑜
• Other Authors: 倪其焜
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/95114561667783770818

碩士 === 國立臺灣師範大學 === 化學系 === 99 === The homochirality of biomolecule plays an important role on the origin of life. We studied the asymmetric photolysis of cysteine and tyrosine in aqueous solution using UV laser and FTIR. We measured the photodecomposition quantum yield at 213nm using FTIR. The results show that the quantum yields are very different for these two molecules. The quantum yields are 20~40% and 1% for cysteine and tyrosine, respectively. Cysteine is decomposed on a repulsive state which results in larger quantum yield. On the other hand, the repulsive state for tyrosine is changed in solution and the corresponding dissociation channel is quenched. As a result, the decomposition quantum yield of tyrosine is small.