Characterization of Picochlorum sp use of wastewater generated from hydrothermal liquefaction as a nitrogen source

TitleCharacterization of Picochlorum sp use of wastewater generated from hydrothermal liquefaction as a nitrogen source
Publication TypeJournal Article
Year of Publication2016
AuthorsWang S.Y, Shi X.G, Palenik B
JournalAlgal Research-Biomass Biofuels and Bioproducts
Date Published2016/01
Type of ArticleArticle
ISBN Number2211-9264
Accession NumberWOS:000370183100034
KeywordsAlgae; algal biofuels; aminopeptidase; aqueous-phase; chlamydomonas-reinhardtii; cultivation; cytosolic ascorbate peroxidase; Hydrothermal liquefaction; light; marine-phytoplankton; microalgae; Nutrient recycling; oxidative stress; photosynthesis; proteomics

Picochlorumsp. strain SENEW3 is a halotolerant green alga with high growth rates and the ability to utilize organic nitrogen sources including wastewater generated from hydrothermal liquefaction (HTL-WW). Picochlorum acclimates to the presence of HTL-WW. In a photosynthesis/respiration rate test, Picochlorum SENEW3 showed a stress response to HTL-WW additions in a dose-dependent manner while cells pre-grown with HTL-WW had a greatly reduced response to additions. A quantitative proteomics tool, iTRAQ, was applied to assess Picochlorum global proteome changes in response to HTL-WWas a nitrogen source. From this approach, a total of 350 different proteins were identified across 2 biological replicates which were significantly up-regulated or down-regulated (average ratio of more than 1.2 or less than 0.8, at least one p-value of <0.05). Protease and oxidative stress enzymes were notably up-regulated. An aminopeptidase enzyme assay showed that, compared to controls, cells grown with 0.1% (vol) HTL-WW had 2.1-fold higher protease activity. An ascorbate peroxidase assay showed an 8.6-fold increase in exponential cells grown with 0.1% HTL-WW compared to controls. This study provides insights into the development of microalgae for algal biofuel production using HTL wastewater recycling [1]. (C) 2015 Elsevier B.V. All rights reserved.

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