title: Screening of surfactants for harmful algal blooms mitigation.
abstract: Screening experiments were conducted in order to find promising synthetic surfactants for harmful algal blooms (HABs) mitigation. The chemically synthesized surfactant cocamidopropyl betaine (CAPB) showed characteristics of relatively high inhibition efficiency, high biodegradability and low cost. The motility inhibition ratios of 10 mg/L CAPB on Cochlodinium polykrikoides and Alexandrium tamarense were about 60% after 5 min. The biodegradation test indicated that the half-life of CAPB in seawater was shorter than one day and 90% was biodegraded after five days under the initial concentration of 100 mg/L at 25 degrees C. Further cell lysis experiments revealed the selective lysis effect of CAPB on different HAB organisms. More than 90% of C. polykrikoides lysed at the concentration of 10 mg/L CAPB after 24 h and at 15 mg/L CAPB after 4 h, whereas the lysis effect of CAPB on A. tamarense was slight, no more than 10% after 2 h interaction with 50 mg/L CAPB. This research provided preliminary data for CAPB as a candidate in harmful algal blooms mitigation and pointed out unresolved problems for its practical application in the meantime.
authors.affiliation: Regional Research Center for Coastal Environments of Yellow Sea, Inha University, Namgu, Incheon 402-751, South Korea. xiaoxiasun@hotmail.com
authors.forename: Xiao-Xia
authors.initials: XX
authors.lastname: Sun
authors.forename: Kyung-Nam
authors.initials: KN
authors.lastname: Han
authors.forename: Joong-Ki
authors.initials: JK
authors.lastname: Choi
authors.forename: Eun-Ki
authors.initials: EK
authors.lastname: Kim
mesh_terms: D000818:Animals; D001622:Betaine / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology*; D001673:Biodegradation, Environmental; D004141:Dinoflagellida / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D005068:Eutrophication / Q000187:drug effects*; D006207:Half-Life; D012623:Seawater; D013501:Surface-Active Agents / Q000378:metabolism / Q000494:pharmacology*; D013997:Time Factors; D014871:Water Microbiology
chemical_list: D013501:Surface-Active Agents; D001622:Betaine; C077055:cocamidopropyl betaine