Dynamic enzymatic synthesis of γ-cyclodextrin using a photoremovable hydrazone template

Sirun Yang, Dennis Larsen, Maria Pellegrini, Sebastian Meier, Dale F. Mierke, Sophie R. Beeren*, Ivan Aprahamian

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


The high water solubility of γ-cyclodextrin (γ-CD) lowers its synthetic yield and complicates its post-synthetic recovery, thus increasing production costs. Here, we report the use of a photoremovable hydrazone template as a proof-of-concept strategy for increasing the efficiency of the enzymatic synthesis of γ-CD and lowering the associated production costs. Our results show that while both the Z and E isomers of the hydrazone switch form low affinity (K = 250–725 M−1) complexes with β-CD (1:1), only the Z isomer of the switch can be included in γ-CD (2:1; K2 = 8,970 M−1). We used this property to preferably synthesize γ-CD and increase its yield by 6-fold and then took advantage of the photoremovable nature of the template to isolate the product. Considering the very limited number of photoswitches that can bind to γ-CDs, we anticipate that this newly discovered host-guest couple will open the way for designing γ-CD-based adaptive materials.
Original languageEnglish
Issue number8
Pages (from-to)2190-2200
Number of pages11
Publication statusPublished - 2021


  • Cyclodextrin
  • Hydrazone
  • Templation
  • Photoswitch
  • Enzymatic synthesis
  • Photoremovable template


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