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| Citation: | Guo Feng, Li Chao, Bai Mindong, Lin Yanqiang, He Xiao, Zheng Qilin. Inactivation of Scrippsiella trochoidea cysts using hydroxyl radials[J]. Haiyang Xuebao, 2017, 39(4): 101-106. doi: 10.3969/j.issn.0253-4193.2017.04.010
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Resting cysts are largely formed during the red tide which may be the "seed bank" of next harmful algal bloom. And the resting cysts are resistant to normal physical and chemical treatments due to their thick cyst walls. In this paper, the resting cysts of Scrippsiella trochoidea were produced using N-limited medium. The resting cysts were inactivated using hydroxyl radicals based on a strong ionization discharge. The results showed that hydroxyl radicals could inactivate the resting cysts effectively when the CT value was 0.49 mg·min/L with a contact time of 10 s. Morphological changes were observed using scanning electron microscope which showed that hydroxyl radicals could destroy the thick cyst wall. After entering the cell, hydroxyl radicals may damage the chlorophyll and DNA. Also, the germination rate decreased to zero. In general, the ·OH treatment can be applied to inactivate the resting cysts of S.trochoidea and provide a new method to kill the harmful algal cysts in ballast water.
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