Effect of sonication frequency on the disruption of algae

Masaki Kurokawa, Patrick M. King, Xiaoge Wu, Eadaoin M. Joyce, Timothy J. Mason, Ken Yamamoto

    Research output: Contribution to journalArticle

    50 Citations (Scopus)
    39 Downloads (Pure)

    Abstract

    In this study, the efficiency of ultrasonic disruption of Chaetoceros gracilis, Chaetoceros calcitrans, and Nannochloropsis sp. was investigated by applying ultrasonic waves of 0.02, 0.4, 1.0, 2.2, 3.3, and 4.3 MHz to algal suspensions. The results showed that reduction in the number of algae was frequency dependent and that the highest efficiency was achieved at 2.2, 3.3, and 4.3 MHz for C. gracilis, C. calcitrans, and Nannochloropsis sp., respectively. A review of the literature suggested that cavitation, rather than direct effects of ultrasonication, are required for ultrasonic algae disruption, and that chemical effects are likely not the main mechanism for algal cell disruption. The mechanical resonance frequencies estimated by a shell model, taking into account elastic properties, demonstrated that suitable disruption frequencies for each alga were associated with the cell’s mechanical properties. Taken together, we consider here that physical effects of ultrasonication were responsible for algae disruption.
    Original languageEnglish
    Pages (from-to)157-162
    JournalUltrasonics Sonochemistry
    Volume31
    Early online date19 Dec 2015
    DOIs
    Publication statusPublished - Jul 2016

    Keywords

    • Algae
    • Disruption
    • Physical effects
    • High-frequency ultrasonic

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