CONTENTS 



PAQB 



PREFACE vii 



PART I. CHEMICAL STATICS IN PROTEIN SYSTEMS 



CHAPTER I. THE CHEMICAL CONSTITUTION OP THE PROTEINS 3 



1. The Chemical Homogeneity of the Protein Group 3 



2. The Products of the Decomposition of the Proteins 4 



3. The Connection between the Amino-acid Content and the Prop- 



erties of the Proteins 8 



4. The Synthesis of Proteins 9 



5. The Occurrence of Peptids among the Products of Protein Hy- 



drolysis 15 



6. The Analysis and Characterization of Proteins by the Determi- 



nation of the Chemical Groups Characteristic of the Different 



Amino-acids 16 



7. Types of Union in the Protein Molecule 17 



8. Some Consequences of the Polypeptid Structure of the Protein 



Molecule 20 



9. "Racemized" Proteins 30 



CHAPTER II. THE PREPARATION OF PURE PROTEINS 34 



1. The Proteins as Chemical Individuals 34 



2. Casein 37 



3. "Insoluble" Serum Globulin 40 



4. Fibrin 42 



5. Haemoglobin . 43 



6. Crystallizable Egg Albumin 44 



7. Ovovitellin 44 



8. The Vegetable Proteins 46 



9. The Alcohol Soluble Vegetable Proteins (Gliadin, Zein, etc.) 48 



10. Ovomucoid 49 



11. Gelatin and Deaminized Gelatin 51 



12. Globin 51 



13. The Protamins 53 



CHAPTER III. THE QUANTITATIVE ESTIMATION OF THE PROTEINS.. . 56 



1. The General Principles Underlying the Quantitative Estimation 



of Proteins 56 



2. The Nephelometric Method of Estimating Proteins 58 



3. The Refractometric Method of Estimating Proteins 60 



xi 



