Biomass production and biochemical profiles of a freshwater microalga Chlorella kessleri in mixotrophic culture: Effects of light intensity and photoperiodicity. (February 2019)

• Record Type: Journal Article
• Authors: Deng, Xiangyuan; Chen, Biao; Xue, Chunye; Li, Da; Hu, Xiaoli; Gao, Kun
• Is Part Of: Bioresource technology. Volume 273(2019)
• Page Start: 358
• Page End: 367
• Publication Date: 2019-02
• Subjects: Chlorella kessleri -- Mixotrophic culture -- Light intensity -- Photoperiodicity -- Chemical compositions; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.11.032
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Light intensity affected the glucose utilization by a microalga Chlorella kessleri . Light could regulate the Chl a accumulation of algal cells in mixotrophic culture. Variations of the culture's pH was related to the algal growth mode. Chemical compositions in this alga changed with light conditions. The alga can be used as animal feeds and a good-quality biodiesel feedstock. Abstract: In this work, different light conditions (light intensity and photoperiodicity) were set up to investigate the impact of light on growth, chemical compositions and fatty acid profiles of Chlorella kessleri in mixotrophic cultures. Results indicated that C. kessleri could absorb and utilize glucose rapidly when light intensity was ≤ 90 µE m −2 s −1, and a maximum algal biomass of 1.17 g L −1 was obtained in the cultures with 2 g L −1 glucose at a light intensity and light/dark (L/D) cycle of 90 µE m −2 s −1 and 20L:4D, respectively. Additionally, this alga would accumulate a large amount of chlorophyll a (about 30 mg g −1 ) in the mixotrophic cultures under a low light intensity (≤90 µE m −2 s −1 ), and the algal chemical compositions changed with light intensity and photoperiodicity. Results of fatty acid profiles suggested that the algal biomass could be used as animal feeds or a good-quality biodiesel feedstock.