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Marine Biotechnology

, Volume 20, Issue 5, pp 623–638 | Cite as

The Plant Alkaloid Camptothecin as a Novel Antifouling Compound for Marine Paints: Laboratory Bioassays and Field Trials

  • Dan Qing Feng
  • Jian He
  • Si Yu Chen
  • Pei Su
  • Cai Huan Ke
  • Wei Wang
Original Article
  • 337 Downloads

Abstract

The extensive use of copper and booster biocides in antifouling (AF) paints has raised environmental concerns and the need to develop new AF agents. In the present study, 18 alkaloids derived from terrestrial plants were initially evaluated for AF activity using laboratory bioassays with the bryozoan Bugula neritina and the barnacle Balanus albicostatus. The results showed that 4 of the 18 alkaloids were effective in inhibiting larval settlement of B. neritina, with an EC50 range of 6.18 to 43.11 μM, and 15 of the 18 alkaloids inhibited larval settlement of B. albicostatus, with EC50 values ranging from 1.18 to 67.58 μM. Field trials that incorporated five alkaloids respectively into paints with 20% w/w indicated an in situ AF efficiency of evodiamine, strychnine, camptothecin (CPT), and cepharanthine, with the most potent compound being CPT, which also exhibited stronger AF efficiency than the commercial antifoulants cuprous oxide and zinc pyrithione in the field over a period of 12 months. Further field trials with different CPT concentrations (0.1 to 20% w/w) in the paints suggested a concentration-dependent AF performance in the natural environment, and the effective concentrations to significantly inhibit settlement of biofoulers in the field were ≥ 0.5% w/w (the efficiency of 0.5% w/w lasted for 2 months). Moreover, CPT toxicity against the crustacean Artemia salina, the planktonic microalgae Phaeodactylum tricornutum and Isochrysis galbana, was examined. The results showed that 24 h LC50 of CPT against A. salina was 20.75 μM, and 96 h EC50 (growth inhibition) values of CPT to P. tricornutum and I. galbana were 55.81 and 6.29 μM, respectively, indicating that CPT was comparatively less toxic than several commercial antifoulants previously reported. Our results suggest the novel potential application of CPT as an antifoulant.

Keywords

Antifouling compound Camptothecin Alkaloid Biofouling Natural antifoulant 

Notes

Acknowledgments

The authors would like to thank Xiamen Sunrui Ship Coating Co., Ltd. for permission to use their floating raft.

Funding Information

This research was supported by the National Marine Economic Development Demonstration Project in Xiamen under Grant 16CZB023SF12; the Public Science and Technology Research Funds Projects of Ocean of China under Grant 201305016; and the Open Fund of Key Laboratory of Integrated Marine Monitoring and Applied Technologies for Harmful Algal Blooms, State Oceanic Administration under Grant MATHAB201808.

Compliance with Ethical Standards

Conflict of Interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Dan Qing Feng
    • 1
    • 2
  • Jian He
    • 1
    • 2
  • Si Yu Chen
    • 1
    • 2
  • Pei Su
    • 1
    • 2
  • Cai Huan Ke
    • 1
    • 2
  • Wei Wang
    • 2
  1. 1.State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology, College of Ocean and Earth SciencesXiamen UniversityXiamenPeople’s Republic of China
  2. 2.Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological ResourcesXiamen UniversityXiamenPeople’s Republic of China

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