Foreword by Prof. Dr. Roger Sheldon .......................... xiii
Preface ........................................................ xv
Contributors ................................................. xvii
PART I FUNDAMENTALS ............................................ 1
1 IONIC LIQUIDS: DEFINITION, APPLICATIONS, AND CONTEXT FOR
BIOTRANSFORMATIONS AND ORGANOCATALYSIS ....................... 3
Pablo Domínguez de María
1.1 Ionic Liquids: Definition, Development, and Overview of
Current Main Applications ............................... 3
1.2 On the Greenness of ILs: Toward the Third Generation
of ILs and DES .......................................... 6
1.3 Context of ILs in Biotransformations and
Organocatalysis ........................................ 12
References .................................................. 13
2 IONIC LIQUIDS AND PROTEINS: ACADEMIC AND SOME PRACTICAL
INTERACTIONS ................................................ 15
Zhen Yang
Abbreviations for Ionic Liquid Cations ...................... 15
Abbreviations for Ionic Liquid Anions ....................... 16
Abbreviations for Ammonium Ionic Liquids .................... 16
Other Abbreviations ......................................... 17
2.1 Introduction ........................................... 17
2.2 Ionic Liquids, Water, and Proteins ..................... 18
2.2.1 Ionic Nature of Ionic Liquids ................... 18
2.2.2 Protic and Aprotic Ionic Liquids ................ 19
2.2.3 Water Present in the Ionic Liquids .............. 21
2.2.4 Interactions of Water and Ionic Liquids with
Proteins ........................................ 21
2.2.4.1 Effect of Water and Water Activity ..... 22
2.2.4.2 Effect of Ionic Liquids ................ 26
2.3 Hofmeister Effects on Biocatalysis ..................... 26
2.3.1 Hofmeister Effects of Inorganic Salts ........... 27
2.3.1.1 Quantification of Hofmeister Series .... 28
2.3.1.2 Effect of Ions on Protein Stability .... 29
2.3.1.3 Effect of Ions on Enzyme Activity ...... 30
2.3.2 Hofmeister Effects of Ionic Liquids ............. 34
2.3.2.1 Effect of Ionic Liquid Ions on Enzyme
Performance in Aqueous Solution ........ 34
2.3.2.2 Kinetic Studies of Enzymes in Ionic
Liquid-Containing Aqueous Solution ..... 38
2.3.2.3 Enzyme Performance in Ionic Liquid-
Dominating Reaction Systems ............ 39
2.4 Impact of Ionic Liquids on Enzymes and Proteins ........ 41
2.4.1 Effect of Ionic Liquids on Enzyme Activity
and Stability ................................... 41
2.4.1.1 Hydrophobicity and Log P ............... 41
2.4.1.2 Nucleophilicity and H-bond Basicity .... 44
2.4.1.3 Viscosity .............................. 45
2.4.2 Effect of Ionic Liquids on Protein Structure
and Dynamics .................................... 46
2.4.3 Effect of Ionic Liquids on Protein Refolding
and Renaturation ................................ 50
2.4.4 Effect of Ionic Liquids on Protein
Crystallization and Fibrilization ............... 52
2.5 Protein Extraction by Means of Ionic Liquids ........... 52
2.5.1 Aqueous/Ionic Liquid-Liquid Extraction Systems .. 52
2.5.2 Ionic Liquid-Based Aqueous Biphasic Systems ..... 53
2.5.3 Water-in-Ionic Liquid Microemulsion Systems ..... 56
2.6 Proper Selection of Ionic Liquids for Biocatalysis ..... 57
2.6.1 Amino Acid Ionic Liquids ........................ 57
2.6.2 Ammonium and Phosphonium Ionic Liquids .......... 58
2.6.3 Design of Ionic Liquids for Biocatalysis ........ 59
2.6.4 Proposed Guidelines for Selecting/Designing
Biocompatible Ionic Liquids ..................... 64
2.7 Concluding Remarks ..................................... 65
References .................................................. 66
PART II IONIC LIQUIDS IN BIOTRANSFORMATIONS ................... 73
3 IONIC LIQUIDS IN BIOTRANSFORMATIONS: MOTIVATION AND
DEVELOPMENT ................................................. 75
Christina Kohlmann and Lasse Greiner
3.1 First Uses of Ionic Liquids in Biotransformations ...... 75
3.2 Motivation to Use IL in Biotransformations ............. 80
3.3 Challenges for the Use of IL in Biotransformations ..... 91
References .................................................. 98
4 IONIC LIQUIDS AND OTHER NONCONVENTIONAL SOLVENTS IN
BIOTRANSFORMATIONS: MEDIUM ENGINEERING AND PROCESS
DEVELOPMENT ................................................ 103
Pedro Lozano and Eduardo García-Verdugo
4.1 Introduction: Toward Greener Catalytic Processes ...... 103
4.2 The Importance of the Medium Engineering in
Biotransformations .................................... 106
4.2.1 Enzymes in Nonaqueous Environments ............. 106
4.3 Biocatalysis in Monophasic ILs Systems ................ 110
4.3.1 Medium Engineering in Monophasic ILs System .... 110
4.3.2 Isolation and Recyclability Issues in
Monophasic ILs System .......................... 115
4.4 (Bio)catalytic Processes in SCFs ...................... 118
4.4.1 Properties of SFCs ............................. 118
4.4.2 Medium Engineering in Supercritical
Biocatalysis ................................... 119
4.4.3 Processes Design for SCF Biocatalysis .......... 122
4.5 Multiphase Biotransformations .......................... 124
4.5.1 Biocatalytic Processes in Biphasic Fluorous
Solvents ....................................... 125
4.5.2 Bioprocesses in Water/scCO2 Systems ............ 126
4.5.3 Bioprocesses in Biphasic ILs System ............ 128
4.5.3.1 Biphasic ILs/Water System ............. 128
4.5.3.2 Phase Behavior of IL/scCO2 Biphasic
Systems ............................... 132
4.5.3.3 Bioprocesses in IL/scCO2 Biphasic
Systems ............................... 134
4.6 Prospects 140 Acknowledgments ......................... 140
References
5 IONIC LIQUIDS AS (CO-)SOLVENTS FOR HYDROLYTIC ENZYMES ...... 151
Hua Zhao
Nomenclature of ILs ........................................ 151
Cations .................................................... 151
Anions ..................................................... 152
5.1 Introduction .......................................... 152
5.1.1 Type of Hydrolases ............................. 152
5.1.2 Properties and Applications of ILs ............. 154
5.2 State-of-the-art: Lipases, Esterases, Proteases in
ILs as (co-)Solvents .................................. 155
5.2.1 Effect of Physical Properties of ILs on
Hydrolase Activity and Stability ............... 156
5.2.1.1 IL Polarity ........................... 156
5.2.1.2 Hydrogen-bond (H-bond) Basicity and
Nucleophilicity of Anions ............. 157
5.2.1.3 IL Network ............................ 160
5.2.1.4 Ion Kosmotropicity .................... 161
5.2.1.5 Viscosity ............................. 165
5.2.1.6 Hydrophobicity ........................ 165
5.2.1.7 Enzyme Dissolution .................... 170
5.2.2 Other Factors Influencing Hydrolase Activity
and Stability .................................. 171
5.2.2.1 Halide Impurities in ILs .............. 171
5.2.2.2 Water Activity ........................ 172
5.2.3 Methods to Improve Hydrolase Activity and
Stability ...................................... 174
5.2.3.1 Enzyme Immobilization ................. 174
5.2.3.2 PEG-Modification ...................... 176
5.2.3.3 EPRP .................................. 177
5.2.3.4 Water-in-IL Microemulsions ............ 178
5.2.3.5 Coating Enzymes with ILs .............. 179
5.2.3.6 Designing Hydrolase-Compatible ILs .... 179
5.3 Use of ILs for (dynamic) Kinetic Resolutions
((D)KRs) .............................................. 183
5.3.1 Kinetic Resolutions via Hydrolysis in Aqueous
Solutions of ILs ............................... 183
5.3.1.1 Enantioselective Hydrolysis of Amino
Acid Esters ........................... 183
5.3.1.2 Enantioselective Hydrolysis of Other
Esters ................................ 184
5.3.2 Kinetic Resolution via Synthesis in
Nonaqueous Solutions of ILs .................... 187
5.3.2.1 Evaluating Hydrolase's
Enantioselectivity via the Kinetic
Resolution of 1-phenylethanol ......... 187
5.3.2.2 Kinetic Resolutions of Other
Alcohols .............................. 188
5.3.2.3 Kinetic Resolutions of Amines ......... 199
5.3.2.4 Kinetic Resolutions Integrated with
Supported IL Membranes (SILMs) or
Microfluidic Separation ............... 199
5.3.2.5 Kinetic Resolution Using IL/scCO2
Biphasic Systems ...................... 202
5.4 Hydrolase-Catalyzed Esterifications of Saccharides
and Cellulose Derivatives in ILs ...................... 205
5.5 ILs for Glycosidases .................................. 210
5.5.1 Glycosidase-Catalyzed Synthesis in ILs ......... 210
5.5.2 Cellulase-catalyzed Hydrolysis in ILs .......... 211
5.6 Prospects ............................................. 212
Acknowledgments ............................................ 213
References ................................................. 213
6 IONIC LIQUIDS AS (CO-)SOLVENTS FOR NONHYDROLYTIC ENZYMES ... 229
Daniela Gamenara, Patricia Saenz Méndez, Gustavo Seoane,
and Pablo Domínguez de María
Nomenclature of ILs ........................................ 229
6.1 Ionic Liquids and Nonhydrolytic Enzymes ............... 231
6.2 Use of ILs in Oxidoreductase-Catalyzed Enzymatic
Reactions ............................................. 232
6.2.1 Dehydrogenases ................................. 232
6.2.2 Laccases, Peroxidases, Oxidases, and
Oxygenases ..................................... 247
6.3 ILs in Lyase-Catalyzed Reactions ...................... 253
6.3.1 Aldolases ...................................... 253
6.3.2 Oxynitrilases .................................. 254
6.4 Prospects ............................................. 256
References ................................................. 256
7 IONIC LIQUIDS AND WHOLE-CELL-CATALYZED PROCESSES ........... 261
Danielle Dennewald and Dirk Weuster-Botz
Abbreviations .............................................. 261
Abbreviations of Ionic Liquid Cations ...................... 261
Abbreviations of Ionic Liquid Anions ....................... 262
Abbreviation of Ionic Liquid ............................... 262
List of Ahhrpifintin ....................................... 262
7.1 Ionic Liquids Compatible with Whole-Cell
Biocatalysis: Fundamentals and Design ................. 263
7.1.1 Biocompatibility ............................... 264
7.1.2 Availability and Purity ........................ 265
7.1.3 Stability ...................................... 265
7.1.4 Process Design Criteria ........................ 265
7.1.4.1 Viscosity, Density, and
Corrosiveness ......................... 266
7.1.4.2 Water Miscibility ..................... 266
7.1.5 Monophasic versus Biphasic Reaction Mode ....... 266
7.1.6 Hazard Potential ............................... 268
7.1.6.1 Ecotoxicity ........................... 268
7.1.6.2 Biodegradability ...................... 269
7.1.7 Recyclability .................................. 271
7.1.8 Availability of Information .................... 271
7.2 Biocompatibility, Tolerance, and Accumulation in the
Cell .................................................. 272
7.2.1 Methods ........................................ 272
7.2.2 Tolerance ...................................... 273
7.2.2.1 Composition of the Ionic Liquid and
Organism Type ......................... 273
7.2.2.2 Other Factors of Influence ............ 276
7.2.2.3 Comparison with Organic Solvents ...... 277
7.2.3 Interaction Mechanism .......................... 278
7.2.3.1 Effect on the Cell Membrane ........... 279
7.2.3.2 Accumulation inside the Cell .......... 280
7.3 State of the Art ...................................... 281
7.3.1 Asymmetric Reductions by Whole Cells in Ionic
Liquids ........................................ 282
7.3.2 Other Whole-Cell Biotransformations in Ionic
Liquids ........................................ 304
7.4 Prospects ............................................. 308
References ................................................. 310
8 NONSOLVENT APPLICATIONS OF IONIC LIQUIDS IN
BIOTRANSFORMATIONS ......................................... 315
Pablo Doménguez de Maria and Christina Kohlmann
8.1 Introduction .......................................... 315
8.2 Ionic Liquids as Additives in Biotransformations ...... 316
8.3 Ionic Liquids for Coating Enzymes: The ILCE Concept ... 318
8.4 Ionic Liquids Combined with Membranes and
Biotransformations .................................... 321
8.5 Ionic Liquids Anchoring Substrates .................... 321
8.6 Ionic Liquids and Bioelectrochemistry ................. 324
References ................................................. 329
PART III IONIC LIQUIDS IN ORGANOCATALYSIS ................... 331
9 IONIC LIQUIDS AS (CO-)SOLVENTS AND CO-CATALYSTS FOR
ORGANOCATALYTIC REACTIONS .................................. 333
Štefan Torna and Radovan Šebesta
9.1 Nontraditional Media in Organocatalysis ............... 333
9.2 Early Organocatalytic Reactions in Ionic Liquids ...... 334
9.3 Ionic Liquids as Solvents for Organocatalytic
Reactions ............................................. 335
9.3.1 Aldol Reactions ................................ 335
9.3.2 Mannich Reactions .............................. 341
9.3.3 α-Amination and Aminoxylation of Carbonyl
Compounds ...................................... 342
9.3.4 Michael Additions .............................. 343
9.3.5 Miscellaneous Reactions ........................ 351
9.4 Ionic Liquids as Co-catalysts for Organocatalytic
Reactions: Toward New Reactivities and Selectivities .. 353
9.5 Key Factors in Choosing Ionic Liquids for
Organocatalysis and Prospects ......................... 355
References ................................................. 356
10 "NONSOLVENT" APPLICATIONS OF IONIC LIQUIDS IN
ORGANOCATALYSIS ............................................ 361
Michelangelo Gruttadauria, Francesco Giacalone, Paola
Agrigento, and Renato Noto
10.1 Introduction .......................................... 361
10.2 Immobilizing Ionic Liquids and Organocatalysts ........ 363
10.2.1 Strategy 1a: Covalently Attached "Ionic
Liquid" Moieties as Supports ................... 363
10.2.2 Strategy 1b: Covalently Attached "Ionic
Liquid" Moieties as Linkers .................... 369
10.2.3 Strategy 1c: Covalently Attached "Ionic
Liquid" Moieties as Organocatalysts ............ 372
10.3 Anchoring of Organocatalyst to Ionic Liquids .......... 378
10.3.1 Aldol Reactions ................................ 379
10.3.2 Michael Reactions .............................. 393
10.3.3 Morita-Baylis-Hillman Reaction and Claisen-
Schmidt Reaction ............................... 405
10.4 Ionic Liquids as Organocatalysts ...................... 405
10.5 Conclusions ........................................... 414
References ................................................. 414
Index ......................................................... 419
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