posted on 2021-05-25, 20:05authored byGui-Guang Cheng, Ya-Ping Liu, Ji Gu, Sheng-Yan Qian, Hong-Jun Yang, Zhong-Yuan Na, Xiao-Dong Luo
Induced water hyacinth with purple
roots (PRWH) exerts a significant
inhibitory effect on the growth of blue-green algae. Interestingly,
its chemical constituents differ from those of wild-type water hyacinth
and have not yet been reported. This study aimed to explore the chemical
constituents of PRWH and its bioactive components serving as allelopathic
agents against blue-green algae. Phytochemical investigation of the
bioactive ethyl acetate fraction of a crude methanol extract from
PRWH led to the isolation of 56 compounds, including 11 new phenylphenalene
derivatives. The structures of these compounds were elucidated by
comprehensive analyses through NMR, HRMS, and X-ray techniques. Bioactivity
evaluation against Microcystis aeruginosa indicated
that compounds 7, 12, 15, 37, 39, 45, and 47 potently
inhibited blue-green algae growth.