An allelopathic fatty acid from the brown alga Cladosiphon okamuranus
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Bioactivities of algicidal C18 hydroxy unsaturated fatty acid isolated from the red alga Tricleocarpa jejuensis and its synthesized propargylic derivative
2020, Algal ResearchCitation Excerpt :In our previous study, linoleic acid and α-linolenic acid were isolated from green alga Ulva lactuca during the course of screening various macroalgae for the algicidal agents against Heterosigma akashiwo (Ochrophyta, Raphidophyceae) [34]. Comparative study on the cytotoxic effects of linoleic acid and α-linolenic acid on various red tide phytoplankton species (C. marina, H. akashiwo, Alexandrium tamarense, Alexandrium taylori, Gymnodinium impudicum, and H. circularisquama (Miozoa, Dinophyceae)) demonstrated that the LC50 values of α-linolenic acid were lower than those of linoleic acid, suggesting that number of unsaturated double bond of fatty acid is important structural element involved in the cytotoxic effect in agreement with other study [14]. The cytotoxic activities of these unsaturated fatty acids were highly species-specific.
Algicidal hydroxylated C18 unsaturated fatty acids from the red alga Tricleocarpa jejuensis: Identification, synthesis and biological activity
2020, FitoterapiaCitation Excerpt :Consequently, considerable studies on the isolation and identification of the allelochemicals of macroalgae have been conducted [4] with the goal of developing an environmentally benign, natural product-based, anti-red tide agent. The algicidal (antialgal) compounds isolated so far include polyunsaturated fatty acids (PUFAs) from Cladosiphon okamuranus [5], Botryococcus braunii [6], Ulva fasciata [7] Lithophyllum yessoense [8], and Sargassum thunbergii [9]; glycerolipids from Ishige sinicola [10] and Ulva prolifera [11,12]; terpenoids from Dictyota dichotoma [13], Gracilaria lemaneiformis [14,15], Dictyopteris undulata [16], and Ulva pertusa [17]; and phenolics [15,17]. Many of these compounds are reported to have potent algicidal activity at concentrations of low μg/mL range against some of the raphidophytes and dinoflagellates responsible for red tides.
Antialgal compounds with antialgal activity against the common red tide microalgae from a green algae Ulva pertusa
2018, Ecotoxicology and Environmental SafetyCitation Excerpt :Most of the recent studies on the control of harmful algal blooms (HAB) by marine macroalgae suggest that application of inhibitory compounds in the control of microalgae require identification of antialgal active substances from marine macroalgae. However, most investigations have focused on the use of fresh marine macroalgae thalli (Nan et al., 2004, 2008; Tang and Gobler, 2011), culture filtrate (Nan et al., 2004, 2008; Wang et al., 2006b), powder (Wang et al., 2006) or seaweed extracts (Friedlander et al., 1996; Suzuki et al., 1996; Jeong et al., 2000; Wang et al., 2007; Sun et al., 2015), while only few antialgal substances from marine macroalgae have been directly structurally elucidated (Kakisawa et al., 1988; Alamsjah et al., 2007; Chiang et al., 2014; Sun et al., 2016; Sun et al., 2017). In this paper, nine antialgal active compounds were isolated from Ulva pertusa for the first time (Table 1 and Fig. 1), and all compounds were isolated from marine macroalgae for the first time other than compound 4, which was detected in Ulva lactuca (Sun, 2006) and Sargassum thunbergii (Qin et al., 2007).
Chemical composition and in vitro anti-algal activity of Potamogeton crispus and Myriophyllum spicatum extracts
2016, Egyptian Journal of Aquatic ResearchCitation Excerpt :Many researchers found that unsaturated fatty acids have allelopathic effects on microalgae (Ikawa, 2004; Wu et al., 2006); this could be by producing free radicals which attach to algae as toxins, when oxidized in water systems (Murata et al., 1989). However, unsaturated fatty acids are very unstable compounds that are subject to auto-oxidation, which reduce algicidal activity (Kakisawa et al., 1988). Therefore, whether these compounds can be effectively applied in open waters is not yet clear.
A sustainable integrated in situ transesterification of microalgae for biodiesel production and associated co˗products ˗ A review
2016, Renewable and Sustainable Energy Reviews