398910 Effect of Stresses during Algae Growth on the Dimensions of Extracted Cellulose Nanocrystals

Monday, November 17, 2014
Galleria Exhibit Hall (Hilton Atlanta)
Aaron Lindsay1, Jessica Miller1, Reza Foudazi1, Abbas Ghassemi2 and Jalal Rastegary3, (1)Chemical and Materials Engineering, New Mexico State University, Las Cruces, NM, (2)New Mexico State University, Chemical Engineering, Institute for Energy and the Environment, Las Cruces, NM, (3)Chemical Engineering, New Mexico State University, Institute for Energy and the Environment/WERC, Las Cruces, NM

Cellulose nanocrystals are a valuable material resource that can be derived from algae with a wide range of applications, such as filtration and reverse osmosis (RO) membranes. If the dimensions of cellulose nanocrystals were controlled, one could tailor them for specific applications. It was hypothesized that, by stressing algae during its growth through high salinity media or air feeds with high carbon dioxide concentrations, there could be an effect on the biosynthesis of cellulose and, consequently, the dimensions of extracted cellulose nanocrystals. To test this, three algae, Nannochloropsis occulata, Desmodesmus abundans, and Scenedesmus obliquus were grown under ambient air, 10%, 20%, and 40% carbon dioxide concentrations as well as under different salinities. Cellulose nanocrystals were extracted from the algae using a bleaching pretreatment with 1.7 wt% sodium chlorite in an acetic acid buffer1 followed by a 60 wt% sulfuric acid hydrolysis treatment2. Characterization was done through TEM and AFM. The work is ongoing.

1. Ma, L., Zhang, Y., Cao, J. and Yao, J. (2014). Preparation of Unmodified Cellulose Nanocrystals from Phyllostachys heterocycla and their Biocompatibility Evaluation. BioResources, 9(1), 210-217.

2.  Sèbe, G., Ham-Pichavant, F., Ibarboure, E., Koffi, A. L. C. and Tingaut, P. (2012). Supramolecular Structure Characterization of Cellulose II Nanowhiskers Produced by Acid Hydrolysis of Cellulose I Substrates. Biomacromolecules, 13, 570-578.

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