title: Inhibitory effects of soluble algae products (SAP) released by Scenedesmus sp. LX1 on its growth and lipid production.
abstract: Soluble algal products (SAP) accumulated in culture medium via water reuse may affect the growth of microalga during the cultivation. Scenedesmus sp. LX1, a freshwater microalga, was used in this study to investigate the effect of SAP on growth and lipid production of microalga. Under the SAP concentrations of 6.4-25.8 mg L(-1), maximum algal density (K) and maximum growth rate (Rmax) of Scenedesmus sp. LX1 were decreased by 50-80% and 35-70% compared with the control group, respectively. The effect of SAP on lipid accumulation of Scenedesmus sp. LX1 was non-significant. According to hydrophilic-hydrophobic and acid-base properties, SAP was fractionized into six fractions. All of the fractions could inhibit the growth of Scenedesmus sp. LX1. Organic bases (HIB, HOB) and hydrophilic acids (HIA) showed the strongest inhibition. HIA could also decrease the lipid content of Scenedesmus sp. LX1 by 59.2%. As the inhibitory effect, SAP should be seriously treated before water reuse.
authors: Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors: Tian-Yuan
authors: TY
authors: Zhang
authors: State Key Laboratory of Environmental Criteria and Risk Assessment, Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China.
authors: Yin
authors: Y
authors: Yu
authors: Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors: Yin-Hu
authors: YH
authors: Wu
authors: Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, PR China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (MARC), Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, PR China. Electronic address: hyhu@tsinghua.edu.cn.
authors: Hong-Ying
authors: HY
authors: Hu
mesh_terms: D056804:Biofuels; D018533:Biomass; D003470:Culture Media / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D007700:Kinetics; D008055:Lipids / Q000737:chemistry*; D058086:Microalgae / Q000737:chemistry; D012044:Regression Analysis; D044444:Scenedesmus / Q000378:metabolism*; D013050:Spectrometry, Fluorescence; D013997:Time Factors; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods
chemical_list: D056804:Biofuels; D003470:Culture Media; D008055:Lipids; D014874:Water Pollutants, Chemical; D014867:Water
keywords: Lipid production; Microalgal biodiesel; Organic fractions; Scenedesmus sp.; Soluble algal products (SAP)