Inhibitory effects of soluble algae products (SAP) released by Scenedesmus sp. LX1 on its growth and lipid production

Bioresour Technol. 2013 Oct:146:643-648. doi: 10.1016/j.biortech.2013.07.142. Epub 2013 Aug 6.

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.

Keywords: Lipid production; Microalgal biodiesel; Organic fractions; Scenedesmus sp.; Soluble algal products (SAP).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biofuels*
  • Biomass*
  • Culture Media / chemistry
  • Hydrophobic and Hydrophilic Interactions
  • Kinetics
  • Lipids / chemistry*
  • Microalgae / chemistry
  • Regression Analysis
  • Scenedesmus / metabolism*
  • Spectrometry, Fluorescence
  • Time Factors
  • Water / chemistry
  • Water Pollutants, Chemical / analysis
  • Water Purification / methods

Substances

  • Biofuels
  • Culture Media
  • Lipids
  • Water Pollutants, Chemical
  • Water