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Related Experiment Videos

Anesthesia cutoff phenomenon: interfacial hydrogen bonding.

J S Chiou1, S M Ma, H Kamaya

  • 1Department of Anesthesia, University of Utah School of Medicine, Salt Lake City.

Science (New York, N.Y.)
|May 4, 1990
PubMed
Summary
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Anesthesia cutoff occurs when larger alkanols lose potency. This study shows their hydrogen bonding to DPPC decreases significantly above 10 carbons, explaining the anesthetic cutoff phenomenon observed in brine shrimp.

Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Pharmacology

Background:

  • The anesthetic cutoff phenomenon describes the loss of anesthetic potency in homologous series of compounds as molecular size increases.
  • Understanding the molecular mechanisms underlying this cutoff is crucial for developing safer anesthetics.

Purpose of the Study:

  • To investigate the hydrogen bonding interactions between 1-alkanol series and dipalmitoyl-L-alpha-phosphatidylcholine (DPPC).
  • To correlate these interactions with the anesthetic potencies of the alkanols and explain the observed anesthetic cutoff.

Main Methods:

  • Fourier transform infrared (FTIR) spectroscopy was used to study hydrogen bonding in DPPC-D2O-in-CCl4 reversed micelles.
  • Anesthetic potencies were estimated using brine shrimp (Artemia salina) lethality assays.

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Main Results:

  • 1-Alkanols formed hydrogen bonds with the DPPC phosphate moiety, releasing bound deuterated water.
  • Hydrogen bonding and water release increased with alkanol chain length up to 1-decanol (C10).
  • These effects abruptly diminished at 1-tetradecanol (C14), coinciding with the anesthetic cutoff.

Conclusions:

  • The study demonstrates that reduced hydrogen bonding of longer-chain alkanols to DPPC is responsible for the anesthetic cutoff phenomenon.
  • FTIR data and brine shrimp assays provide consistent evidence for the molecular basis of anesthetic cutoff at C10-C14.