Increased lipid production of the marine oleaginous microalgae Isochrysis zhangjiangensis (Chrysophyta) by nitrogen supplement

Dina Feng, Zhaoan Chen, Song Xue, Wei Zhang

    Research output: Contribution to journalArticle

    146 Citations (Scopus)

    Abstract

    Effects of nitrate feeding on the cell growth and lipid accumulation of marine microalgae Isochrysis zhangjiangensis were investigated. When nitrate was supplied at interval of 24h, instead of 72h, a high lipid content of 40.9% and a biomass density of 3.1gL-1 were obtained. To confirm whether I. zhangjiangensis accumulates lipid during nitrogen-repletion, a two-stage cultivation method was applied. This algal strain had a high lipid content during sustained nitrate addition and showed a high carbohydrate content under nitrate-depletion conditions. These results revealed that this algal strain can accumulate lipids under nitrogen-repletion conditions and accumulate carbohydrate under nitrogen-depletion conditions. When cultured in an extremely high nitrate concentration, 9gL-1 at 24h intervals, the growth of algal cells was suppressed, but the highest lipid content of 53% was attained. This special characteristic of lipid accumulation makes I. zhangjiangensis an ideal candidate for producing biodiesel using N-rich wastewater.

    Original languageEnglish
    Pages (from-to)6710-6716
    Number of pages7
    JournalBioresource Technology
    Volume102
    Issue number12
    DOIs
    Publication statusPublished - 2011

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