Acorn Barnacles Secrete Phase-Separating Fluid to Clear Surfaces Ahead of Cement Deposition.


Journal Article

Marine macrofoulers (e.g., barnacles, tubeworms, mussels) create underwater adhesives capable of attaching themselves to almost any material. The difficulty in removing these organisms frustrates maritime and oceanographic communities, and fascinates biomedical and industrial communities seeking synthetic adhesives that cure and hold steadfast in aqueous environments. Protein analysis can reveal the chemical composition of natural adhesives; however, developing synthetic analogs that mimic their performance remains a challenge due to an incomplete understanding of adhesion processes. Here, it is shown that acorn barnacles (Amphibalanus (=Balanus) amphitrite) secrete a phase-separating fluid ahead of growth and cement deposition. This mixture consists of a phenolic laden gelatinous phase that presents a phase rich in lipids and reactive oxygen species at the seawater interface. Nearby biofilms rapidly oxidize and lift off the surface as the secretion advances. While phenolic chemistries are ubiquitous to arthropod adhesives and cuticles, the findings demonstrate that A. amphitrite uses these chemistries in a complex surface-cleaning fluid, at a substantially higher relative abundance than in its adhesive. The discovery of this critical step in underwater adhesion represents a missing link between natural and synthetic adhesives, and provides new directions for the development of environmentally friendly biofouling solutions.

Full Text

Duke Authors

Cited Authors

  • Fears, KP; Orihuela, B; Rittschof, D; Wahl, KJ

Published Date

  • June 2018

Published In

Volume / Issue

  • 5 / 6

Start / End Page

  • 1700762 -

PubMed ID

  • 29938165

Pubmed Central ID

  • 29938165

Electronic International Standard Serial Number (EISSN)

  • 2198-3844

International Standard Serial Number (ISSN)

  • 2198-3844

Digital Object Identifier (DOI)

  • 10.1002/advs.201700762


  • eng