Field experiments on mitigation of harmful algal blooms using a Sophorolipid—Yellow clay mixture and effects on marine plankton

Lee, Youngju; Choi, Joong-Ki; Kim, Eun-Ki; Youn, Seok-Hyun; Yang, Eun Jin

doi:10.1016/j.hal.2007.06.004

Cited by 90 publications

(50 citation statements)

References 15 publications

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“…Microcystis colonies floated up if only PFS was added without sediment clay, so in this case sediment clay worked as "ballast", causing the flocculation complex to deposit down on the lake bottom (Sun et al, 2004;Lee et al, 2008). Nutrient concentration, especially various phosphorus types of TP, IP, OP, FeeP, CaeP and SRP, are relatively low (shown in supplementary files) in sediment clay used in this experiment.…”

Section: Discussionmentioning

confidence: 94%

An integrated method for removal of harmful cyanobacterial blooms in eutrophic lakes

Wang

Qin

et al. 2012

Environmental Pollution

103

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Section: Discussionmentioning

confidence: 94%

An integrated method for removal of harmful cyanobacterial blooms in eutrophic lakes

Wang

Qin

et al. 2012

Environmental Pollution

103

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“…Among the technologies of mechanical, biological, chemical, genetic and environmental control (Anderson, 2009), significant attention has been focused on the use of clay to flocculate and settle the cyanobacteria cells in natural waters (Anderson, 1997;Sengco et al, 2001;Yu et al, 1994). However, the efficiency of clay alone was low and high loads of clay (0.25-2.5 g/L) Sengco et al, 2001;Sun et al, 2004) often lead to various ecological concerns (Lee et al, 2008). Pan et al (2006) found that local soil/sand collected from lake shore after modified by chitosan could be turned into effective flocculants to remove cyanobacteria blooms and improve water quality, which greatly reduced the dosage to 11 mg/L and hence minimized the costs and the use of exogenous materials to the aquatic environments.…”

Section: Introductionmentioning

confidence: 99%

Influence of zeta potential on the flocculation of cyanobacteria cells using chitosan modified soil

Zhang

Pan

2015

Journal of Environmental Sciences

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Using chitosan modified soil to flocculate and sediment algal cells has been considered as a promising strategy to combat cyanobacteria blooms in natural waters. However, the flocculation efficiency often varies with algal cells with different zeta potential (ZP) attributed to different growth phases or water conditions. This article investigated the relationship between ZP of Microcystis aeruginosa and its influence to the flocculation efficiency using chitosan modified soil. Results suggested that the optimal removal efficiency was obtained when the ZP was between − 20.7 and − 6.7 mV with a removal efficiency of more than 80% in 30 min and large floc size of > 350 μm. When the algal cells were more negatively charged than − 20.7 mV, the effect of chitosan modified soil was depressed (< 60%) due to the insufficient charge density of chitosan to neutralize and destabilize the algal suspension. When the algal cells were less negative than − 6.7 mV or even positively charged, a small floc size (< 120 μm) was formed, which may be difficult to sink under natural water conditions. Therefore, manipulation of ZP provided a viable tool to improve the flocculation efficiency of chitosan modified soil and an important guidance for practical engineering of cyanobacteria bloom control.

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“…In recent years, SLs have attracted much attention for their applications due to their good surface activity, biodegradability, biocompatibility, low toxicity, production process under mild conditions, and production from renewable materials (Lee et al, 2008). Also, SLs have attracted more attention since they were found to have good anti-microbial, antiinflammatory, and even anti-HIV activities, which will broaden their applications in the pharmaceutical sector (Shah et al, 2005;Yoo et al, 2005;Napolitano 2006).…”

Section: Introductionmentioning

confidence: 99%

Production, characterization and anticancer activity of <em>Candida bombicola</em> sophorolipids by means of solid state fermentation of sunflower oil cake and soybean oil

Rashad¹,

Nooman²,

Ali³

et al. 2014

Grasas y Aceites

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SUMMARY:The production of sophorolipids by Candida bombicola NRRL Y-17069 grown in a mixture of sunflower oil cake and crude soybean oil as economic substrates with different fermentation techniques was studied. The highest yield (49.5 g·100 g −1 substrates) was obtained from solid state fermentation after employing a new concept for extraction by methanol (E I) followed by ethyl acetate (E II), then partially purified with hexane (E III). The course of time of fermentation was also studied, and E I extracted of the 12 th day showed the minimum surface tension (45 mN·m −1 ) at a critical micelle dilution (CMD) of 10% concentration. The produced sophorolipids were characterized and confirmed by FTIR and 1 H NMR spectroscopy. The anticancer activity of the produced compounds was assessed against MCF-7, HepG2, A549, HCT116 cancer cell lines and the results revealed that E III and E IV (a mixture of E I & E III) act as promising anticancer agents in HepG2 and A549 by inhibiting urokinase and histone deacetylase activities. KEYWORDS: Anticancer activity; Candida bombicola; Solid state fermentation; Sophorolipids; Soybean oil; Sunflower oilcakeRESUMEN: Producción, caracterización y actividad anticancerígena de soforolípidos producidos mediante fermentación en estado sólido con Candida bombicola de tortas de girasol y aceite de soja. Se estudió la producción de soforolípidos por Candida bombicola NRRL Y-17069 cultiva con diferentes técnicas de fermentación en una mezcla de torta de girasol y aceite de soja crudo, como sustratos económicos. El rendimiento más alto (49,5 g·100 g −1 de sustrato) se obtuvo por fermentación en estado sólido después de extraer con metanol (IE) seguido de acetato de etilo (EII), y de purificación parcial con hexano (EIII). También se estudió el tiempo de fermentación, considerando que el extracto IE de 12 días mostró una tensión superficial mínima (45 mN·m −1 ) a una dilución micelar crítica (CMD) de concentración 10 %. Los soforolípidos producidos se caracterizaron y se confirmaron mediante espectroscopia FTIR y RMN de 1 H. La actividad anticancerígena de los compuestos producidos se evaluó en células MCF-7, HepG2, A549, líneas celulares de cáncer de HCT116 y los resultados revelaron que EIII y EIV (una mezcla de EI y EIII) actúan como prometedores agentes anticancerígenos en HepG2 y A549 inhibiendo las actividades de uroquinasa e histona desacetilasa.

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Field experiments on mitigation of harmful algal blooms using a Sophorolipid—Yellow clay mixture and effects on marine plankton

Cited by 90 publications

References 15 publications

An integrated method for removal of harmful cyanobacterial blooms in eutrophic lakes

An integrated method for removal of harmful cyanobacterial blooms in eutrophic lakes

Influence of zeta potential on the flocculation of cyanobacteria cells using chitosan modified soil

Production, characterization and anticancer activity of <em>Candida bombicola</em> sophorolipids by means of solid state fermentation of sunflower oil cake and soybean oil

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