Application Possibility of Naphthoquinone Derivative Nq 4-6 for Mitigation of Winter Diatom Bloom

Abstract

We conducted the algicidal activity screening tests using 10 L microcosm to investigate the possibility of the field application of naphthoquinone derivative Nq 4-6 compound as an algicide. We determined its application range to assess its algicidal effects on the phytoplankton and to evaluate the response of the planktonic community and the water environment to this chemical. From results of the microcosm experiments, Nq 4-6 compound showed high algicidal activity on the centric diatoms such as Stephanodiscus hantzschii and Cyclotella meneghiniana, but it had no effect on other phytoplankton. The abundance of S. hantzschii continuously increased in the control, but its cell density decreased 1 day after the Nq 4-6 treatment. In particular, Nq 4-6 showed algicidal activity of 94.4% against S. hantzschii 7 days after the treatment. The dominance index of phytoplankton community was lower in the treatment than in the control. The diversity index, richness index and evenness index of phytoplankton community was higher in the treatment. Environmental factors and biological factors did not show specific changes after the Nq 4-6 compound treatment. Therefore, the results of this study demonstrates that Nq 4-6 is an effective agent for the control of S. hantzschii blooms, and that the microcosm tests play a crucial role when assessing field application.

Novel Algicidal Substance (Naphthoquinone Group) from Bio-derived Synthetic Materials against Harmful Cyanobacteria, Microcystis and Dolichospermum

“…따라서, 본 연구진은 NQ를 기반으로 하 여 다양한 치환기 (Rn)를 변화시켜 합성한 살조물질 의 효과 및 생태계 미치는 영향에 대하여 평가하였 다. 하지만, 기존 연구는 겨울철 녹조 현상의 원인 종 인 Stephanodiscus hantzschii을 대상으로 한 연구로 써 (Byun et al 2015 -2, 3-2, 4-6, 5-6, 5-2, 6-2, 7-6, 9-6, 10-6H, 15-6, 18-6, 21-2, 21-6, 22-6, 27, 38-p, 40, 42, 45, 48, 49, 54) 13-2, 15-6, 15-2, 19-6, 21-2, 21-6, 22-6, 26, 27, 40, 44, 45, 46, 48, 49, 53) 1 µM 농도에서 80% 이상의 살조효과를 나타내었다 (Fig. 2 The different letters (a, b and c) represent significant differences by one-way ANOVA test (n=10, P < 0.05).…”