by Siu-tai Tsim. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1993. / Includes bibliographical references (leaves 382-403). / Statement --- p.4 / Acknowledgements --- p.5 / Abstract --- p.6 / Abbreviation --- p.8 / Chapter Chapter 1. --- General introduction --- p.10 / Chapter PART I. --- Biodegradation of Indigo carmine / Chapter Chapter 2. --- Introduction to indigo/indigo carmine --- p.29 / Chapter Chapter 3. --- Purification and characterization of crude indigo carmine degrading enzyme --- p.59 / Chapter Chapter 4. --- Characterization of indigo carmine degradation products --- p.181 / Chapter Chapter 5. --- Toxicity of indigo carmine and its degradation products --- p.219 / Chapter Chapter 6. --- A new method to determine the concentration of indigo dye --- p.301 / Chapter PART II. --- Biosorption of Sulfur black dye / Chapter Chapter 7. --- "An efficient method for removal of sulfur black dye, a contaminant in sodium thiosulfate, a side product of sulfur black production" --- p.319 / References --- p.382