Periodic and Fractal Precipitation in ATP-Co2+-Decoxycholate Gel System
YIN Wen-xuan1,2, LIU Yu-feng2, ZHAO Ying3, BAI Song-yan1, ZHU Wei-wei1, WENG Shi-fu2, GAO Qing-yu1,WU Jin-guang2*
1. College of Chemical Engineering, China University of Mining Technology and Engineering, Xuzhou 221008, China 2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China 3. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080,China
Abstract:In the simulation experiments in vitro of the formation of gallstone, adenosine-triphosphate(ATP)-Co2+-deoxycholic acid(DC) gel system was chosen to study the periodic precipitation progress. The effect of ATP on the Co2+-DC gel system was also determined, and the structure of the periodic precipitation formed was characterized by FTIR. The results show that the patterns formed in the systems with ATP are different, ATP affected the rate and structure of precipitation through its variable participation in the metal coordination complexes as judged by the phosphate PO bands and the deoxycholate COO- symmetric and asymmetric vibration bands as measured by FTIR. Theses spectroscopic differences were correlated with color and pattern differences in the precipitates. ATP has a more remarkable function than AMP to the modes of patterns, meanwhile the system patterns transform from fractal to periodic precipitation. There is a complex interaction among ATP, sodium deoxycholic and Co2+ with a transparent crystal produced. The crystal is deoxycholic acid and the periodic precipitation is composed of ATP and DC covalent to Co2+. These results indicate that stone formation and remodeling is a dynamic, nonlinear progress. Much of the precipitate, as judged by local differences in composition, is not in equilibrium with the general gel environment. The authors conclude that the formation of gallstone features complex and nonlinear chemical character, in which nucleotides as living material play a very important role.
[1] HUANG Zhi-qiang(黄志强). Gall-Stone(胆结石). Beijing: Tsinghua University Press(北京:清华大学出版社),2002. [2] OUYANG Jian-ming(欧阳键明). Groundmass regulation and Control of Biomineralization and Bionic Application(生物矿化的基质调控及其仿生应用 ). Beijing: Chemical Industry Press(北京:化学工业出版社),2006. 3. [3] Wu J G, Xu D F, Liu F, et al. American Gastroenterological Association Conference,1990, 98(5): A256. [4] LI Xiao-feng, Soloway R D, WU Jin-guang(李晓峰,Soloway R D, 吴瑾光). Science in China(B)(中国科学,B辑),1996, 26(1): 52. [5] Li X F,Soloway R D,Wu J G,et al. Clin. Res.,1997, 41(2): A158. [6] XIE Da-tao, XU Yi-zhuang, WU Jin-guang,et al(谢大弢,徐怡庄,吴瑾光,等). Acta Scient iarum Naturalium Universitat is Pekinensis(北京大学学报·自然科学版), 1997,33(2):137. [7] HUI Jian-bin, LIU Hui-zhou, WU Jin-guang(惠建斌,刘会洲,吴瑾光). Acta Biophysica Sinica(生物物理学报),1997,13(4):647. [8] LIU Zhen-hua, LU Jian-keng, WU Jin-guang, et al(刘振华,陆俭铿,吴瑾光,等). Acta Scientiarum Naturalium Universitat is Pekinensis(北京大学学报·自然科学版), 1998,34(4):415. [9] SUN Ying, YANG Zhan-lan, WU Jin-guang,et al(孙 颖, 杨展澜, 吴瑾光,等). Science in China (B)(中国科学,B辑),2001, 31(5): 385. [10] XIE Da-tao, YANG Li-min, WU Jin-guang,et al(谢大弢, 杨丽敏, 吴瑾光,等). Acta Physico-Chimica Sinica(物理化学学报), 2005, 21(2): 205. [11] Yin Wen-xuan,Soloway R D,Wu J G,et al. Gastroenterology,2005,128(4): A262. [12] WU Jin-guang(吴瑾光). Modern Fourier Transform Infrared Spectroscopy, Technology and Applications(近代傅里叶变换红外光谱技术及应用). Beijing: Scientific and Technical References Press of China(北京: 科学技术文献出版社), 1994. [13] WENG Shi-fu(翁诗甫). FTIR Spectrograph(傅里叶变换红外光谱仪). Beijing: Chemical Industry Press(北京:化学工业出版社),2005. 3.